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Proceedings of The Fifth International Coral Reef Congress, 1985
The Fifth International Coral Reef Symposium was conducted by The "Museum National d'Histoire Naturelle" (National Museum of Natural History) and the "Ecole Pratique des Hautes Etudes" (Practical School of Advanced Studies) in Tahiti, French Polynesia, from 27th May to 1st June, 1985.

About 600 participants registered at the symposium, representing 44 countries. Approximately 400 papers were presented and 208 papers were published in 6 volumes proceedings of the symposium.

Search Result: 66 records

ICRS5
Hearty, P.J. and G. Dai Pra, 1985

Aminostratigraphy and 230-Th-234-U dating of quaternary shorelines in the Puglia region of Southeast Italy.

p. 163-170 in Gabrie, C., J. L Toffart and B. Salvat (Eds.) Proceedings Of The Fifth International Coral Reef Congress. Tahiti, 27 May -1 June 1985. Vol. 3 : Symposia and Seminars (A).

Author

Hearty, P.J. and G. Dai Pra

Year

1985

Title

Aminostratigraphy and 230-Th-234-U dating of quaternary shorelines in the Puglia region of Southeast Italy.

Source

p. 163-170 in Gabrie, C., J. L Toffart and B. Salvat (Eds.) Proceedings Of The Fifth International Coral Reef Congress. Tahiti, 27 May -1 June 1985. Vol. 3 : Symposia and Seminars (A).

Keywords

paleontology, geography, icrs5

Caption

Abstract

Amino acid racemization studies of the mollusk genera Glycymeris, ~ and Astralium, uranium-series analysis of the coral Cladocora caespitosa, and bio- and lithostratigraphy have distinguished four ages (aminozones C, E, F, and G) of marine deposits in the Puglia region of southeast Italy. Aminozone E, the Eutyrrhenian, cont,ins primary Stro~bus bubonius and other Senegalese taxa, and has been U-series dated at 122 + 4 10 years and thus correlated with isotopic stage 5e. A younger aminozone C, the Neotyrrhenian, lies -within stage 5 (Sa or 5c). :wo older, pre-~~~~~bu! aminozones, F and G, are tentatively correjated with stages 7 and 9. An uplJ.ft rate of 0.20 mll0 yr was calculated from the well dated 122 10 yr, 28-35 m stage 5e shoreline in Mare Piccolo. Extrapolation of this rate to younger and older isotopic events supports our correlation of aminozone C, F and G related shorelines with stages 5c, 7 and 9. A nearly continuous record of sea level changes during the last interglacial has been interpreted from the generated through intensive studies at II Fronte, in Mare Piccolo. Amino acid geochronology has been valuable in this study to date and correlate non-coralliferous deposits to U-series d~ted sites.

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ICRS5
Bourrouilh-Le Jan, F.G., 1985

An attempt at datation by isotopic stratigraphy of holocene and pleistocene notches and deposits of some so-called uplifted atolls (high carbonate islands).

p. 125-130 in Gabrie, C., J. L Toffart and B. Salvat (Eds.) Proceedings Of The Fifth International Coral Reef Congress. Tahiti, 27 May -1 June 1985. Vol. 3 : Symposia and Seminars (A).

Author

Bourrouilh-Le Jan, F.G.

Year

1985

Title

An attempt at datation by isotopic stratigraphy of holocene and pleistocene notches and deposits of some so-called uplifted atolls (high carbonate islands).

Source

p. 125-130 in Gabrie, C., J. L Toffart and B. Salvat (Eds.) Proceedings Of The Fifth International Coral Reef Congress. Tahiti, 27 May -1 June 1985. Vol. 3 : Symposia and Seminars (A).

Keywords

icrs5 sea-level changes

Caption

Abstract

The presence of notches of marine origin were noticed very early by naturalists on carbonate cliffs. They are especially responsible for the name, "uplifted atolls~', given to flat carbonate islands, surrounded by a high rim looking down a central plain. The better knowledge of Pliocene to Holocene eustatic variations by isotopic stratigraphy md of the up and down correlative movements of the sea level allow hypotheses and calculations to be made of the age and tiDE during which the notches have been formed. These calculations have been done for several so-called uplifted atolls of High Carbonate Islands, located in the SW and SE Pacific and allow the notches and their correlative coral deposits to be dated.

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ICRS5
Skyring, G.W., 1985

Anaerobic microbial processes in coral reef sediments.

p. 421-426 in Gabrie, C., J. L Toffart and B. Salvat (Eds.) Proceedings Of The Fifth International Coral Reef Congress. Tahiti, 27 May -1 June 1985. Vol. 3 : Symposia and Seminars (A).

Author

Skyring, G.W.

Year

1985

Title

Anaerobic microbial processes in coral reef sediments.

Source

p. 421-426 in Gabrie, C., J. L Toffart and B. Salvat (Eds.) Proceedings Of The Fifth International Coral Reef Congress. Tahiti, 27 May -1 June 1985. Vol. 3 : Symposia and Seminars (A).

Keywords

sediments, icrs5

Caption

Abstract

Microbial anaerobic processes occur in sediments associated with coral reefs even though many appear to be well aerated by physical mixing or bioturbation. Bacterial sulfate reduction, a strictly anaerobic respiration process, is the most easily demonstrated indicator of anaerobic processes in marine sediments. It results in the production of sulfide which has been shown to occur in the sediments of Kaneohe Bay, Bermuda, Jamaica, Lizard Island and Davies Reef. Sulfate reduction rates in these sediments_rre lOll when canpared to those for most other marine environments. A maximum of around 8mmo1 m day was measured for the top 5cm of the sediment from the back lagoon of Davies Reef. In jge back reef lagoon, 901. of the sulfate reductioo occurred in the top 2cm sediment. Up to 60% of the S recovered in the sulfide fractions, occurred in a tin-reducible fraction.

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ICRS5
Matson, E.A., 1985

Anoxic community catabolism in the shallow carbonate muds of Bermuda.

p. 433-438 in Gabrie, C., J. L Toffart and B. Salvat (Eds.) Proceedings Of The Fifth International Coral Reef Congress. Tahiti, 27 May -1 June 1985. Vol. 3 : Symposia and Seminars (A).

Author

Matson, E.A.

Year

1985

Title

Anoxic community catabolism in the shallow carbonate muds of Bermuda.

Source

p. 433-438 in Gabrie, C., J. L Toffart and B. Salvat (Eds.) Proceedings Of The Fifth International Coral Reef Congress. Tahiti, 27 May -1 June 1985. Vol. 3 : Symposia and Seminars (A).

Keywords

community metabolism icrs5

Caption

Abstract

Anoxic decomposition is not routinely measured in coral reef or other carbonate systems due to apparent dominance of metabolism by aerobic processes. Turbulence is frequently sufficient to preclude both the deposition of fines and burial of organic matter. However, in quiescent macrophyte beds, caves, tunnels, and around the burrows of in fauna, anoxic metabolism is often an important decomposition mechanism. Reduced end products may accumulate and serve as energy sources for chemo1ithotrophic and mixotrophic micro-organisms. These mater1a1s contain all the residual energy of autotrophy not (yet) released aerobically and serve as buffers against~p1etion of electron donors generated by photoautotrophs. Tetrazo1ium salts were used as alternate electron acceptors to estimate anoxic community catabolism (i.e., oxidation of respiratory enzymes) in several suboxic 5\d anoxic IIJJds at Bermuda. Comparisons were made with simultaneously obtained estimates of °2 and 5°42- reduction and with estimates of net primary production to determine the relative flow of reducing equivalents to acceptors other than °2. The microbta1 community in Tha1assia spp. beds, ca11ianassid mound sand and fecal pellets «2 m water) and in a deeper (24 m) depositional area was predominantly facultative. Rates of anoxic catabolism were equivalent to those of °2 reduction when °2 was removed. Although 5°42- reduction rates were low in comparison with total catabolism, dissolved sulphides were as high as 5 mM. The Eh of many sediments (as low as -450 mV) indicated that methanogenesis was important, even within an of the sediment surface. Regardless of the terminal electron acceptor used, total bulk microbial community metabolism equalled or exceeded net primary production. Therefore, production DUst be rapidly recycled for eucaryotic consumers, and this may largely occur within anoxic muds. Reducing equivalents transferred to 5 and N which accUmllate in muds may be responsible for preservation of reducing po~r in otherwise highly oxidized systems.

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ICRS5
Moriarty, D.J.W., P.C. Pollard, D.M. Alongi, C.R. Wilkinson and J.S. Gray, 1985

Bacterial productivity and trophic relationships with consumers on a coral reef (MECOR I).

p. 457-462 in Gabrie, C., J. L Toffart and B. Salvat (Eds.) Proceedings Of The Fifth International Coral Reef Congress. Tahiti, 27 May -1 June 1985. Vol. 3 : Symposia and Seminars (A).

Author

Moriarty, D.J.W., P.C. Pollard, D.M. Alongi, C.R. Wilkinson and J.S. Gray

Year

1985

Title

Bacterial productivity and trophic relationships with consumers on a coral reef (MECOR I).

Source

p. 457-462 in Gabrie, C., J. L Toffart and B. Salvat (Eds.) Proceedings Of The Fifth International Coral Reef Congress. Tahiti, 27 May -1 June 1985. Vol. 3 : Symposia and Seminars (A).

Keywords

nutrition, bacteria, mucus icrs5

Caption

Abstract

The productivity and trophic role of bacteria on coral reefs is reviewed and reassessed in light of new observations on the effect of coral ImlCUS and meibenthos on bacterial growth rates. Bacterial biomass and productivity are greater in sediments than in the water column. There is considerable seasonal variation with bacterial numbers and growth rates several tinES greater in SUDnEr than winter. Incubation experiments with and without mucus from Acropora spp. and Porites spp. show that bacterial production in Dalcus-enriched seawater was significantly greater thai in untreated seawater. In laboratory culture experiments, the presence of meiofauna enhanced bacterial growth only when twice the natural density of nEiofauns at Davies Reef, Great Barrier Reef, were used. However, higher concentrations of NH4 and NOZ in culture dishes with meiofauna than in control cultures suggests that meiofauns enhance the regeneration of N. The importance of protozoans, benthic copepods, ho1othuroids and filter feeders as major consumers of bacteria on coral reefs is supported by the information available to date.

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ICRS5
Trichet, J., L.A. Chambers and C.L. Wilkinson, 1985

Biogeochemical and Microbial Processes In Reef Environments Role Of Micro-Organisms In Coral Reef Ecosystems: Conclusion.

p. 471-475 in Gabrie, C., J. L Toffart and B. Salvat (Eds.) Proceedings Of The Fifth International Coral Reef Congress. Tahiti, 27 May -1 June 1985. Vol. 3 : Symposia and Seminars (A).

Author

Trichet, J., L.A. Chambers and C.L. Wilkinson

Year

1985

Title

Biogeochemical and Microbial Processes In Reef Environments Role Of Micro-Organisms In Coral Reef Ecosystems: Conclusion.

Source

p. 471-475 in Gabrie, C., J. L Toffart and B. Salvat (Eds.) Proceedings Of The Fifth International Coral Reef Congress. Tahiti, 27 May -1 June 1985. Vol. 3 : Symposia and Seminars (A).

Keywords

icrs5

Caption

Abstract

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ICRS5
Chambers, L.A., 1985

Biogeochemical aspects of the carbon metabolism of microbial mat communities.

p. 371-376 in Gabrie, C., J. L Toffart and B. Salvat (Eds.) Proceedings Of The Fifth International Coral Reef Congress. Tahiti, 27 May -1 June 1985. Vol. 3 : Symposia and Seminars (A).

Author

Chambers, L.A.

Year

1985

Title

Biogeochemical aspects of the carbon metabolism of microbial mat communities.

Source

p. 371-376 in Gabrie, C., J. L Toffart and B. Salvat (Eds.) Proceedings Of The Fifth International Coral Reef Congress. Tahiti, 27 May -1 June 1985. Vol. 3 : Symposia and Seminars (A).

Keywords

growth, paleoenvironments, metabolism, nutrition icrs5

Caption

Abstract

Early diagenetic processes within microbial mats in carbonate forming environments serve as a key to understanding the palaeoenvironments of sane prospective hydrocarbon reservoirs and base metal deposits. The carbon metabolism of the microbial mat community from Gladstone Embayment, Western Australia, represents an integration of photosynthesis and chellX)- and photo-heterotrophy. The inter-relation of these processes, in the production and fate of volatile fatty acids, has been studied using differential inhibition in intact cores. Acetate concentration is high (1-2 DIM) in the porewaters of the surface layer (0-0.5 cm) compared to underlying sediments and other environments, and is an important substrate for bacterial sulphate reduction.sS34 values of -20 to -27%0 for sulphide in the sediment are ooditional evidence of this activity. The consequences of these microbial activities in relation to carbonate precipitation are discussd. Absorption spectra of extracts fran microbial mats fran Gladstone &nbayment and Hao Atoll, French Polynesia, indicate pigments essential for light harvesting reactions and are characteristic of particular organisms. They may also reflect environmental influences. Their potential as bianarkers in paleoenvironments is considered.

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ICRS5
Smith, S.V., R.C. Schneider and G.W. Tribble, 1985

Carbon isotopic balance in coral reef ecosystems.

p. 445-450 in Gabrie, C., J. L Toffart and B. Salvat (Eds.) Proceedings Of The Fifth International Coral Reef Congress. Tahiti, 27 May -1 June 1985. Vol. 3 : Symposia and Seminars (A).

Author

Smith, S.V., R.C. Schneider and G.W. Tribble

Year

1985

Title

Carbon isotopic balance in coral reef ecosystems.

Source

p. 445-450 in Gabrie, C., J. L Toffart and B. Salvat (Eds.) Proceedings Of The Fifth International Coral Reef Congress. Tahiti, 27 May -1 June 1985. Vol. 3 : Symposia and Seminars (A).

Keywords

isotopes, icrs5

Caption

Abstract

Organic carbon in coral reef sediments represents the balance among three major potential source terms: organic matter produced by the reef benthos, plankton either produced within the reef system or washed in from the ocean, and detritus derived from land. Each of these carbon sources has a characteristic carb~n isotopt§ signature, with the reef benthos signature being isotopically heavier than the other sources. The C of the sediments therefore has a net isotopic value representing the proportional contributions of each source term. Kaneohe Bay, Hawaii, a high-isla~d reef system wi~h substa~tial trsrigenous.sediment input and relatively rapid water exchange with the adjacent ocean, exh1bits sed1ment C which 1S light compared to reef benthos. Fanning and Chris1Jnas atolls (Liy~ Islands) have lagoonal reef systans with very restricted water exchange. These systems have sediment C values which are close to or slightly heavier than reef benthos values. We tentatively conclude that rapid water circulation, and perhaps high terrigenous organic supply, deliver ODre non-benthos organic matter to Kaneohe Bay than to the two atoll systens.

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ICRS5
Graus, R.R., I.G. MacIntyre and B.E. Herchenroder, 1985

Computer simulation of the Holocene facies history of a Caribbean fringing reef (Galeta Point, Panama).

p. 317-322 in Gabrie, C., J. L Toffart and B. Salvat (Eds.) Proceedings Of The Fifth International Coral Reef Congress. Tahiti, 27 May -1 June 1985. Vol. 3 : Symposia and Seminars (A).

Author

Graus, R.R., I.G. MacIntyre and B.E. Herchenroder

Year

1985

Title

Computer simulation of the Holocene facies history of a Caribbean fringing reef (Galeta Point, Panama).

Source

p. 317-322 in Gabrie, C., J. L Toffart and B. Salvat (Eds.) Proceedings Of The Fifth International Coral Reef Congress. Tahiti, 27 May -1 June 1985. Vol. 3 : Symposia and Seminars (A).

Keywords

modelling, reef structure, paleontology icrs5

Caption

Abstract

Continuing experiments with the COREEF computer model have produced a successful simulation of the previously doc~nted pattern of facies development at Galeta Reef, Panama. The model quantitatively defines the major coralgal and sediment zones of Caribbean reefs primarily with respect to light and wave energy. It then calculates these parameters at equally-spaced stations along a given reef profile and assigns zones according to the values obtained. -nte model reef initiated growth on the profile of the Miocene age Gatun Fotmation, md grew in 200 yr. increments from 8000 yrs B.P. to the present time. The zones specified by the model accunJ.1lated to form facies at rates established for various reef-building canlnlnities throughout the Caribbean. Sea level rose at the time-specific rates as calculated from a Caribbean sea-level curve. From previous si!l11lation experiments with COREEF on a Jamaican reef, average storm conditions were assumed to control the normal coralgal zonation pattern; maximum storm conditions, the distribution of rubble. Deepwater wave heights and periods for these conditions were hind cast with the help of a storm surge model (GINT) using published data on the speed, direction of the motion, and location of nearby storms during the past century. Verification of COREEF's ability to reproduce the facies patterns of actual reefs completes the testing phase of model development. Future plans for COREEF include the classification of Caribbean reefs with respect to the environmental parameters that produced them.

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10.

ICRS5
Stoddart, D.R., 1985

Conclusion: hurricane effects on coral reefs.

p. 349-350. in Gabrie, C., J. L Toffart and B. Salvat (Eds.) Proceedings Of The Fifth International Coral Reef Congress. Tahiti, 27 May -1 June 1985. Vol. 3 : Symposia and Seminars (A).

Author

Stoddart, D.R.

Year

1985

Title

Conclusion: hurricane effects on coral reefs.

Source

p. 349-350. in Gabrie, C., J. L Toffart and B. Salvat (Eds.) Proceedings Of The Fifth International Coral Reef Congress. Tahiti, 27 May -1 June 1985. Vol. 3 : Symposia and Seminars (A).

Keywords

HURRICANE EFFECT; CORAL REEF, ICRS5

Caption

Abstract

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11.

ICRS5
Oberdorfer, J.A. and R.W. Buddemeier, 1985

Coral reef hydrogeology,

p. 307-312. in Gabrie, C., J. L Toffart and B. Salvat (Eds.) Proceedings Of The Fifth International Coral Reef Congress. Tahiti, 27 May -1 June 1985. Vol. 3 : Symposia and Seminars (A).

Author

Oberdorfer, J.A. and R.W. Buddemeier

Year

1985

Title

Coral reef hydrogeology,

Source

p. 307-312. in Gabrie, C., J. L Toffart and B. Salvat (Eds.) Proceedings Of The Fifth International Coral Reef Congress. Tahiti, 27 May -1 June 1985. Vol. 3 : Symposia and Seminars (A).

Keywords

Oceanography, Hydrogeology, Geomorphology, Circulation, ICRS5

Caption

Abstract

Coral reefs are dynamic systems with respect to water fluxes, not static barriers as they are often described. Knowledge of internal flow velocities and pore water residence time is important in understanding pore water geochemistry, nutrient fluxes at the benthic boundary, reef diagenesis, and fresh water resources in reef islands. Hydrogeologic studies of reef and atoll islands indicate a dual aquifer system; the major Pleistocene aquifer has hydraulic conductivities on the order of 1000 mId, while the overlying Holocene aquifer of unconsolidated sedi~nts is at least an order of magnitude less permeable. The high permeability in the Pleistocene formation is the result of large voids, both constructional and fran subaerial solution during low stands of the sea. Wind, wave and tide induced head differences (ranging from a few centimeters to several tens of centimeters) provide the driving force for internal flow. Pore water residence ti~s and geochemistry will vary greatly, depending on whether the water is in a major flow channel or in more restricted pores. Studies of both submerged reefs and atoll islands give bulk pore water residence ti~s in the order of months to a few years. Pore water chemical analyses indicate that both carbonate solution and precipitation are taking place, which will alter porosity and permeability with time. The dual aquifer model also suggests that the Ghyben-Herzberg lens approach to reef island fresh water resources is inaccurate and can lead to a gross overestimation of the potable resource.

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12.

ICRS5
Takahashi, T., M. Koba and T. Nakamori, 1985

Coral reefs of the Ryukyu Islands. Reef morphology and reef zonation.

p. 211-216 in Gabrie, C., J. L Toffart and B. Salvat (Eds.) Proceedings Of The Fifth International Coral Reef Congress. Tahiti, 27 May -1 June 1985. Vol. 3 : Symposia and Seminars (A).

Author

Takahashi, T., M. Koba and T. Nakamori

Year

1985

Title

Coral reefs of the Ryukyu Islands. Reef morphology and reef zonation.

Source

p. 211-216 in Gabrie, C., J. L Toffart and B. Salvat (Eds.) Proceedings Of The Fifth International Coral Reef Congress. Tahiti, 27 May -1 June 1985. Vol. 3 : Symposia and Seminars (A).

Keywords

Reef morphology, Reef zonation, Coral reefs, ICRS5

Caption

Abstract

There are fringing 'reefs around the majority of islands of the southern and middle parts of the Ryukyu Islands. Very little ~rk with quantitative descriptions of coral-reef cannunities has been done on those reefs in the past. In this paper the studies on some reefs of Ishigaki Island and Kume Island are presented with quantitative descriptions of coral canBlnities using qu~rat or line transect methods. Coral colonies are classified in combination with the genus and the life form in here. By being compiled from those ~rks, the schene of the reef zonation in this area is proposed. Moreover, the relation between coral colonies and the sample spots is discussed with cluster analysis and factor analysis based on the quantitative data. Those analyses are effective in the elucidation of the connection between reef morphology and coral community.

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13.

ICRS5
Marshall, J.F., 1985

Cross-shelf and facies related variations in submarine cementation in the Central Great Barrier Reef.

p. 221-226. in Gabrie, C., J. L Toffart and B. Salvat (Eds.) Proceedings Of The Fifth International Coral Reef Congress. Tahiti, 27 May -1 June 1985. Vol. 3 : Symposia and Seminars (A).

Author

Marshall, J.F.

Year

1985

Title

Cross-shelf and facies related variations in submarine cementation in the Central Great Barrier Reef.

Source

p. 221-226. in Gabrie, C., J. L Toffart and B. Salvat (Eds.) Proceedings Of The Fifth International Coral Reef Congress. Tahiti, 27 May -1 June 1985. Vol. 3 : Symposia and Seminars (A).

Keywords

reef structure icrs5

Caption

Abstract

Drill core of Holocene reef material from fifteen shallow holes on five reefs, that form part of the reef tract on the outer half of the 120 km-wide continental shelf off Townsville, show distinct vsriations in facies development and in the degree of submarine cementation across the shelf. Reefs on the outer edge of the shelf (Myrmidon and Viper Reefs) are frame~rk dominated, particularly on their windward margins (80-90 percent framework), whereas on the inner edge of the reef tract (Wheeler Reef) the framewrk accounts for only 18 to 30 percent of the reef structure; the reuainder being unconsolidated sediments. Branching corals dominate the framework, and in the outer shelf reefs they are relatively fragile. The outer reefs' frame~rk also exhibits 1 to 10 cm high interskeletal cavities that have been extensively infilled by lithified crusts and laminated mudstone; both types of infill are dominated by Mg-calcite peloids. Extensive cement and internal sedi~nt infill of skeletal chambers, pores, snd borings is also evident in the outer reefs. However, the amount of inter- and intraskeletal infill and cementation decreases toward the inner shelf and the inner reefs are relatively uncemented. This cross-shelf trend is mimicked by some of the larger mid-tract reefs (Stanley and Bowl Reefs), in that the windward margins are frame~rk dominated and reasonably well-ce~nted, whereas leeward margins are sediment dominated and uncemented. Results from the central Great Barrier Reef verify previously noted cross-shelf trends (e.g. Belize) and this same trend is evident in the northern Great Barrier Reef. Palaeobathymetric reconstructions for the outer shelf reefs of the central Great Barrier Reef indicate that the tops of the reefs were some 15 to 20 m below sea level during the dominant period of vertical reef growth between 8000 and 4000 years B.P. This indicates that shallCN high energy conditions have not been significant factor in the cementation process. Rather, it appears that pressure gradients, resulting from either the build-up of oceanic water against the edge of the shelf or the surge from long-period ocean swells (or both), has been the dominant process for pumping large quantities of seawater through the porous system of the reef frame~rk, and which has ultimately led to the precipitation of large quantities of submarine cements.

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14.

ICRS5
Pisera, A., 1985

Diagenesis of the middle miocene algal-vermetid reefs from Poland: an example of the local late diagenetic continental control.

p. 277-282 in Gabrie, C., J. L Toffart and B. Salvat (Eds.) Proceedings Of The Fifth International Coral Reef Congress. Tahiti, 27 May -1 June 1985. Vol. 3 : Symposia and Seminars (A).

Author

Pisera, A.

Year

1985

Title

Diagenesis of the middle miocene algal-vermetid reefs from Poland: an example of the local late diagenetic continental control.

Source

p. 277-282 in Gabrie, C., J. L Toffart and B. Salvat (Eds.) Proceedings Of The Fifth International Coral Reef Congress. Tahiti, 27 May -1 June 1985. Vol. 3 : Symposia and Seminars (A).

Keywords

paleontology, reef structure icrs5

Caption

Abstract

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15.

ICRS5
Fendler, E., 1985

Diagenetic differentiation in Jurassic reefs in the Hesperian range, Spain.

p. 295-300 in Gabrie, C., J. L Toffart and B. Salvat (Eds.) Proceedings Of The Fifth International Coral Reef Congress. Tahiti, 27 May -1 June 1985. Vol. 3 : Symposia and Seminars (A).

Author

Fendler, E.

Year

1985

Title

Diagenetic differentiation in Jurassic reefs in the Hesperian range, Spain.

Source

p. 295-300 in Gabrie, C., J. L Toffart and B. Salvat (Eds.) Proceedings Of The Fifth International Coral Reef Congress. Tahiti, 27 May -1 June 1985. Vol. 3 : Symposia and Seminars (A).

Keywords

reef structure, paleontology icrs5

Caption

Abstract

Coral reefs occur near the Paleozoic uplift NNW Albarracin ( 160 km ENE Madrid). In the middle Jurassic, a barrier reef exposed over 1.2 km length and 80 m height is canposed mainly of danal corals; the landward lagoonal patch reefs, 8 m wide and 6 m high, are formed by branching corals. The corals are partly filled with sediment, then the skeleton is dissolved; sediment filling may rsnain preserved. Secondary pores were later filled with calcite cement; residual pores remained ppen. In a given corallite infilled/replaced skeleton, spary calcite cement and residual pore coexist. In the Barrier Reef this diagenetic pattern was observed only in the lower and morphologically deeper genetic portions; the upper and central portions are canpletely dolomitized because of subaerial exposure indicated by intercalated caliche crusts, and were subsequently dedolomitized. In the Upper Jurassic, there is another barrier reef, 2 km long and maximally 80 m high, in which the coral skeletons are generally replaced by micrite. The interstices are filled with fine spary calcite, possibly replacing original internal sediment, which is then partly or totally replaced by coarse blocky calcite. Alternatively, the skeleton is replaced by a very fine calcite, the the cavities filled with micrite. The entire coral is then neo~orphologically replaced by a coarse calcite. The marked differences in diagenesis between Middle and Upper Jurassic corals probably reflect the differences in respective relative palaeographical proximity of the paleozoic uplift which is a known source of aggresive solutions moving into adjacent rocks; variations in exposures also contributed.

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16.

ICRS5
Perrin, P. and A. Pascal, 1985

Diagenetic effects in Urgonian subreefal platform limestones (Upper Aptian-Lower Albian) from Armorican continental margin (North Atlantic Ocean). Isotopic data.

p. 289-294 in Gabrie, C., J. L Toffart and B. Salvat (Eds.) Proceedings Of The Fifth International Coral Reef Congress. Tahiti, 27 May -1 June 1985. Vol. 3 : Symposia and Seminars (A).

Author

Perrin, P. and A. Pascal

Year

1985

Title

Diagenetic effects in Urgonian subreefal platform limestones (Upper Aptian-Lower Albian) from Armorican continental margin (North Atlantic Ocean). Isotopic data.

Source

p. 289-294 in Gabrie, C., J. L Toffart and B. Salvat (Eds.) Proceedings Of The Fifth International Coral Reef Congress. Tahiti, 27 May -1 June 1985. Vol. 3 : Symposia and Seminars (A).

Keywords

reef structure, icrs5

Caption

Abstract

Petrographic and isotopic data are here applied to Upper Aptian -Lower Albian urgonian liroostones, gathered along the north continental margin of the Bay of Biscay, by the subroorsible "Cyana", during the Cymor 2 reconnaissance deep dive in 1981 at water depths of 1740 -2770 m. On the basis of seismic reflection profiles, reef trends md erosion surfaces in the Mid-Cretaceous -re distinguished. This work is focused on sparitic and micritic facies of shallow water (isopachous dog tooth md fibro r:adial ceroonts) with benthic foraminifera, green algae, sponges, rudists md mmy coral remains. They take place in a subreefal biosedimentary system. We must consider that these carbonates have been submitted for Upper Cretaceous, to deep marine conditions (pressure, tsnperature, circulation of water, currents). Diving observations revealed the karstic aspect of the submarine topography of Cretaceous md Tertiary carbonates. Have the liroostones undergone a subaerial diagenesis? Is their appearance due to fresh water diagenesis or should we imagine a submarine evolution? Dissolution followed by precipitation md geopetal sediroont filling seem to be important, especially in the facies including coar!§ biorjasts, and may have recurred. Isotopic methods used on carbon and oxygen contents, ( 0 C) in bioclasts, cements and matrices indicate diagenetic effects in submarine environroonts.

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17.

ICRS5
Enos, P., 1985

Diagenetic evolution of cretaceous reefs in Mexico.

p. 301-306 in Gabrie, C., J. L Toffart and B. Salvat (Eds.) Proceedings Of The Fifth International Coral Reef Congress. Tahiti, 27 May -1 June 1985. Vol. 3 : Symposia and Seminars (A).

Author

Enos, P.

Year

1985

Title

Diagenetic evolution of cretaceous reefs in Mexico.

Source

p. 301-306 in Gabrie, C., J. L Toffart and B. Salvat (Eds.) Proceedings Of The Fifth International Coral Reef Congress. Tahiti, 27 May -1 June 1985. Vol. 3 : Symposia and Seminars (A).

Keywords

reef structure, evolution icrs5

Caption

Abstract

The Taninul facies outcropping along the SE edge of the Mid-Cretaceous Valles platform are canparable to the prolific Al Abra reservoirs of the Golden Lane. Canposed mainly of rudist debris, they nevertheless include small lenses of caprinid boundstone. They also exhibit numerous disconformity surfaces and related early marine and meteoric cements. These early diagenetic sequences visible in most samples are variable. Many begin with an early bladed submarine cement which is followed by marine vadose and meteoric sparry cements. Others begin with marine vadose and terminate with marine phreatic cements. A third system begins with meteoric dissolution and sparry cementation which is followed by transgressive submarine cements. These variable diagenetic sequences clearly reflect sedimentation and diagenesis close to sea level and thus susceptible to repeated emergence and transgression.

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18.

ICRS5
Reichelt, R.E., D.G. Green and R.H. Bradbury, 1985

Discrete simulation of cyclone effects on the spatial patterns and community structure of a coral reef.

p. 337-342. in Gabrie, C., J. L Toffart and B. Salvat (Eds.) Proceedings Of The Fifth International Coral Reef Congress. Tahiti, 27 May -1 June 1985. Vol. 3 : Symposia and Seminars (A).

Author

Reichelt, R.E., D.G. Green and R.H. Bradbury

Year

1985

Title

Discrete simulation of cyclone effects on the spatial patterns and community structure of a coral reef.

Source

p. 337-342. in Gabrie, C., J. L Toffart and B. Salvat (Eds.) Proceedings Of The Fifth International Coral Reef Congress. Tahiti, 27 May -1 June 1985. Vol. 3 : Symposia and Seminars (A).

Keywords

modelling, disturbance, recovery, cyclones icrs5

Caption

Abstract

A discrete, spatial simulation model of a windward reef slope coral community was constructed using a grid of points 120 x 60 in di~nsion. Each point nominally represented a 10 x 10 an section of reef substratum. There were 6 categories of benthos, one considered 'empty space' or non-living, the rest treated as living, colonial organisms. The model incorporated recruit~nt, growth, canpetition mortality and storms. Sensitivity analyses of competition and mortality parametres showed that linear hierarchies of overgrowth ability have a swamping effect on the model canllUnity even under conditions of extremely high disturbance. The spatial nature of the simulation added unpredictable complexity to the system's response to disturbance even though the probabilities of death from disturbance were kept constant. Comparisons are drawn with the recovery of Jamaican reefs after Hurricane Allen destroyed coral communities in 1980.

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19.

ICRS5
Charpy, L., 1985

Distribution and composition of particulate organic matter in the lagoon of Tikehau,

p. 353-358. In Gabrie, C., J. L Toffart and B. Salvat (Eds.) Proceedings Of The Fifth International Coral Reef Congress. Tahiti, 27 May -1 June 1985. Vol. 3 : Symposia and Seminars (A).

Author

Charpy, L.

Year

1985

Title

Distribution and composition of particulate organic matter in the lagoon of Tikehau,

Source

p. 353-358. In Gabrie, C., J. L Toffart and B. Salvat (Eds.) Proceedings Of The Fifth International Coral Reef Congress. Tahiti, 27 May -1 June 1985. Vol. 3 : Symposia and Seminars (A).

Keywords

Particulate organic matter, Lagoon, Distribution, Chemistry, ICRS5

Caption

Abstract

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20.

ICRS5
Pigott, J.D. and N.I. Trumbly, 1985

Distribution and origin of beachrock cements, Discovery Bay (Jamaica).

p. 241-248. in Gabrie, C., J. L Toffart and B. Salvat (Eds.) Proceedings Of The Fifth International Coral Reef Congress. Tahiti, 27 May -1 June 1985. Vol. 3 : Symposia and Seminars (A).

Author

Pigott, J.D. and N.I. Trumbly

Year

1985

Title

Distribution and origin of beachrock cements, Discovery Bay (Jamaica).

Source

p. 241-248. in Gabrie, C., J. L Toffart and B. Salvat (Eds.) Proceedings Of The Fifth International Coral Reef Congress. Tahiti, 27 May -1 June 1985. Vol. 3 : Symposia and Seminars (A).

Keywords

geology, icrs5

Caption

Abstract

Extensive but locally discontinuous Holocene beachrock crops out within the intertidal of Northern Jamaica. A systanatic beachrock coring and interstitial water sampling program was conducted ! 0.5 km west of the Discovery Bay Marine Lab. The unit ranges up to 44 cm in thickness and consists of fine to medium calcarenites of sorted Goniolithon, Halimeda, and coral fragments. The allochems are lithified by at least five distinctive cements: micritic envelopes of high ~ calcite, equant to bladed high Mg calcite, micritic high Mg calcite, pelletoidal high Mg calcite, and equant to fibrous aragonite. The cements vary laterally and vertically contributing to a variety of petrographic fabrics typically indicative of other carbonate environments. Cement mineralogies approach chemical rauilibrium with the pore waters and can be directly related to tre dissolved CO2 activity. Whole rock C dates suggest accumulation-cementation rates of 1.4 mm yr- below a rock depth of 14 cm and almost instantaneously above 14 cm.

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21.

ICRS5
Multer, H.G. and H. Zankl, 1985

Distribution, structure and origin of Holocene patch reefs in the West Indies.

p. 227-228. in Gabrie, C., J. L Toffart and B. Salvat (Eds.) Proceedings Of The Fifth International Coral Reef Congress. Tahiti, 27 May -1 June 1985. Vol. 3 : Symposia and Seminars (A).

Author

Multer, H.G. and H. Zankl

Year

1985

Title

Distribution, structure and origin of Holocene patch reefs in the West Indies.

Source

p. 227-228. in Gabrie, C., J. L Toffart and B. Salvat (Eds.) Proceedings Of The Fifth International Coral Reef Congress. Tahiti, 27 May -1 June 1985. Vol. 3 : Symposia and Seminars (A).

Keywords

reef structure, paleontology icrs5

Caption

Abstract

Small reef structures isolated from the main reef tract are described as patch reefs. Most of these reach sea level and thus may range from 1 to over 10 m in height above the adjacent floor. l1Ie thickness of their framework varies with water depths. In plan view patch reefs may be round, horseshoe-shaped or atoll-like. l1Ieir distribution strongly reflects baseDEnt geoDDrphology usually derived from Pleistocene (a) subaerial differential erosion and channeling, (b) karstification or (c) tectonic control. Two different types of patch reef framework can be observed: (1) a rigid framework built by reef organisms fused to each other by organic c eDEn tat ion , attached to a hard substrate, and canposed of a rather dense thicket of carbonate skeletons ~ pillars with larger cavities in between, and (2) a constrasting non-rigid framet«>rk built by loose colonies of reef builders and/or their debris which trap fine sediment. A transition of the latter type of patch reef into mud mounds is possible under low energy lagoonal conditions. Construction of the rigid framework patch reef is mainly from skeletal growth and organic cementation in addition to inorganic carbonate cementation including high Mg-calcite and aragonite. Successful construction of the non-rigid framework patch reef demands an increasing high rate of sediment production that is protected by an algal cover or organic ceDEntation. Surfaces of fused framework overlying soft sediments may provide substrates for a new generation of rigid framework.

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22.

ICRS5
Humbert, L. and J. Dessary, 1985

Dolomitization aspects of Makatea Island (French Polynesia).

p. 3:271-276. In Gabrie, C., J. L Toffart and B. Salvat (Eds.) Proceedings Of The Fifth International Coral Reef Congress. Tahiti, 27 May -1 June 1985. Vol. 3 : Symposia and Seminars (A).

Author

Humbert, L. and J. Dessary

Year

1985

Title

Dolomitization aspects of Makatea Island (French Polynesia).

Source

p. 3:271-276. In Gabrie, C., J. L Toffart and B. Salvat (Eds.) Proceedings Of The Fifth International Coral Reef Congress. Tahiti, 27 May -1 June 1985. Vol. 3 : Symposia and Seminars (A).

Keywords

geology icrs5

Caption

Abstract

The geom~tz:y of the lenticular dolomite body reflects both selective and post-dolomite dissolution (dedolomitisation). Dolomites, as noted by Buigues (1982 and this volume) attain maximum thickness (280 m) below peripheral islands, being absent in certain lagoonal wells and reduced in wells deviated towards the oceanic flanks of the atoll. Dolomitisation is contemporaneous with, or follows arogonite dissolution. This generally results in a highly porous rock best developed within the cental parts of the atoll. Dolomitic cementation, either by overgrowth on replacement rhombohedra, or as pore linings, leads progressively to a crystalline dolomite. This porosity-destroying phenomenon is best developed in wells drilled on peripheral islands and possibly reflects more actively circulating marine waters. Dedolomite occurs mainly as rhanbohedral pores which may constitute up to 407. of the rock. It begins near the present surface and tends to occur in fine sediments. The presence of rhombohedral voids within a limestone indicates that X-ray analyses alone are not sufficient to define the original distribution of dolomite in reefs. De4o1omite phenomena extend down to about 100 m where they are replaced by massive dolomites. This suggests that the upper limits of the present dolomite body may be partly the result of dedolomitisation of unstable calcian dolomites during Quaternary lowering of sea-level. Conclusion: Because of the favourable spatial distribution of wells, the geometry and lateral variations within the dolomite body have been established. Thinning or absence within the central parts of the atoll and excessive dolomite cementation in peripheral wells suggest an important marine influence in the process of dolomitisation. However, lateral variations around the periphery of the atoll suggest that this oceanic influence may vary in intensity.

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23.

ICRS5
Bourrouilh-Le Jan, F.G., J. Talandier and B. Salvat, 1985

Early diagenesis from 6000 years ago and the geomorphology of atoll rims in the Tuamotu.

p. 235-240. in Gabrie, C., J. L Toffart and B. Salvat (Eds.) Proceedings Of The Fifth International Coral Reef Congress. Tahiti, 27 May -1 June 1985. Vol. 3 : Symposia and Seminars (A).

Author

Bourrouilh-Le Jan, F.G., J. Talandier and B. Salvat

Year

1985

Title

Early diagenesis from 6000 years ago and the geomorphology of atoll rims in the Tuamotu.

Source

p. 235-240. in Gabrie, C., J. L Toffart and B. Salvat (Eds.) Proceedings Of The Fifth International Coral Reef Congress. Tahiti, 27 May -1 June 1985. Vol. 3 : Symposia and Seminars (A).

Keywords

bioconstruction, reef structure icrs5

Caption

Abstract

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24.

ICRS5
Laboute, P., 1985

Evaluation of damage done by the cyclones of 1982-1983 to the outer slopes of the Tikehau and Takapoto Atolls (Tuamotu Archipelago).

p. 323-330. in Gabrie, C., J. L Toffart and B. Salvat (Eds.) Proceedings Of The Fifth International Coral Reef Congress. Tahiti, 27 May -1 June 1985. Vol. 3 : Symposia and Seminars (A).

Author

Laboute, P.

Year

1985

Title

Evaluation of damage done by the cyclones of 1982-1983 to the outer slopes of the Tikehau and Takapoto Atolls (Tuamotu Archipelago).

Source

p. 323-330. in Gabrie, C., J. L Toffart and B. Salvat (Eds.) Proceedings Of The Fifth International Coral Reef Congress. Tahiti, 27 May -1 June 1985. Vol. 3 : Symposia and Seminars (A).

Keywords

Cyclones, Stress, ICRS5

Caption

Abstract

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25.

ICRS5
Scoffin, T.P., D.R. Stoddart, A.W. Tudhope and C.D. Woodroffe, 1985

Exposed limestone of Suwarrow Atoll, (Northern Cook Islands, S. W. Pacifique)

p. 137-140 in Gabrie, C., J. L Toffart and B. Salvat (Eds.) Proceedings Of The Fifth International Coral Reef Congress. Tahiti, 27 May -1 June 1985. Vol. 3 : Symposia and Seminars (A).

Author

Scoffin, T.P., D.R. Stoddart, A.W. Tudhope and C.D. Woodroffe

Year

1985

Title

Exposed limestone of Suwarrow Atoll, (Northern Cook Islands, S. W. Pacifique)

Source

p. 137-140 in Gabrie, C., J. L Toffart and B. Salvat (Eds.) Proceedings Of The Fifth International Coral Reef Congress. Tahiti, 27 May -1 June 1985. Vol. 3 : Symposia and Seminars (A).

Keywords

Limestone, Geology, ICRS5

Caption

Abstract

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