globalchange  > 过去全球变化的重建
DOI: 10.1016/j.palaeo.2013.09.032
论文题名:
Deglacial mesophotic reef demise on the Great Barrier Reef
作者: Abbey E.; Webster J.M.; Braga J.C.; Jacobsen G.E.; Thorogood G.; Thomas A.L.; Camoin G.; Reimer P.J.; Potts D.C.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2013
卷: 392
起始页码: 473
结束页码: 494
语种: 英语
英文关键词: Coralgal assemblages ; Mesophotic reef ; Radiocarbon dating ; Submerged reef
英文摘要: Submerged reefs are important recorders of palaeo-environments and sea-level change, and provide a substrate for modern mesophotic (deep-water, light-dependent) coral communities. Mesophotic reefs are rarely, if ever, described from the fossil record and nothing is known of their long-term record on Great Barrier Reef (GBR). Sedimentological and palaeo-ecological analyses coupled with 67 14C AMS and U-Th radiometric dates from dredged coral, algae and bryozoan specimens, recovered from depths of 45 to 130m, reveal two distinct generations of fossil mesophotic coral community development on the submerged shelf edge reefs of the GBR. They occurred from 13 to 10ka and 8ka to present. We identified eleven sedimentary facies representing both autochthonous (in situ) and allochthonous (detrital) genesis, and their palaeo-environmental settings have been interpreted based on their sedimentological characteristics, biological assemblages, and the distribution of similar modern biota within the dredges. Facies on the shelf edge represent deep sedimentary environments, primarily forereef slope and open platform settings in palaeo-water depths of 45-95m. Two coral-algal assemblages and one non-coral encruster assemblage were identified: 1) Massive and tabular corals including Porites, Montipora and faviids associated with Lithophylloids and minor Mastophoroids, 2) platy and encrusting corals including Porites, Montipora and Pachyseris associated with melobesioids and Sporolithon, and 3) Melobesiods and Sporolithon with acervulinids (foraminifera) and bryozoans. Based on their modern occurrence on the GBR and Coral Sea and modern specimens collected in dredges, these are interpreted as representing palaeo-water depths of <60m, <80-100m and >100m respectively. The first mesophotic generation developed at modern depths of 85-130m from 13 to 10.2ka and exhibit a deepening succession of <60 to >100m palaeo-water depth through time. The second generation developed at depths of 45-70m on the shelf edge from 7.8ka to present and exhibit stable environmental conditions through time. The apparent hiatus that interrupted the mesophotic coral communities coincided with the timing of modern reef initiation on the GBR as well as a wide-spread flux of siliciclastic sediments from the shelf to the basin. For the first time we have observed the response of mesophotic reef communities to millennial scale environmental perturbations, within the context of global sea-level rise and environmental changes. © 2013 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/69544
Appears in Collections:过去全球变化的重建

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作者单位: Geocoastal Research Group, School of Geosciences, University of Sydney, NSW 2006, Australia; Departamento de Estratigrafia y Paleontologia, Universidad de Granada, Granada, Spain; Institute for Environmental Research, Australian Nuclear Science and Technology Organisation, Locked Bag 2001, Kirrawee DC, NSW 2232, Australia; Institute of Materials Engineering, Australian Nuclear Science and Technology Organisation, Locked Bag 2001, Kirrawee DC, NSW 2232, Australia; University of Oxford, Department of Earth Sciences, Parks Road, Oxford OX1 3PR, United Kingdom; School of Geosciences, University of Edinburgh, West Mains Road, Edinburgh EH9 3JW, United Kingdom; Aix-Marseille Université, CNRS, IRD, CEREGE UM34, EuropÔle Mediterraneen de l'Arbois, B.P. 80, F-13545 Aix-en-Provence CEDEX 4, France; School of Geography, Archaeology and Palaeoecology (GAP), Queen's University Belfast, Belfast, BT7 1NN Northern Ireland, United Kingdom; Department of Earth and Evolutionary Biology, University of California, Santa Cruz, CA 95604, United States

Recommended Citation:
Abbey E.,Webster J.M.,Braga J.C.,et al. Deglacial mesophotic reef demise on the Great Barrier Reef[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2013-01-01,392
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