气候变化领域集成服务门户(CCPortal): Microbialites in Last Glacial Maximum and deglacial reefs of the Great Barrier Reef (IODP Expedition 325; NE Australia)

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DOI	10.1016/j.palaeo.2018.10.007
	Microbialites in Last Glacial Maximum and deglacial reefs of the Great Barrier Reef (IODP Expedition 325; NE Australia)
	Braga J.C.; Puga-Bernabéu Á.; Heindel K.; Patterson M.A.; Birgel D.; Peckmann J.; Sánchez-Almazo I.M.; Webster J.M.; Yokoyama Y.; Riding R.
发表日期	2019
ISSN	0031-0182
起始页码	1
结束页码	17
卷号	514
英文摘要	Microbialites are volumetrically abundant components in Last Glacial Maximum and deglacial reefs in the Australian Great Barrier Reef sampled by IODP Expedition 325 in 34 holes from 17 sites (M0030–M0058), along four transects on the shelf edge. Detailed radiometric datings show that four distinct reef phases developed between 28and 10 ka, displaying offlapping and then backstepping patterns. The reef boundstone facies include coralgal, coralgal-microbialite and microbialite boundstone. The microbialite consists of combinations of micrite/microspar, bioclasts, siliciclastic grains (up to 14.5%), fenestrae and encrusting epibionts. The micrite/microspar is high-magnesian calcite commonly irregularly clotted, fenestral and peloidal. Mesoscale microbialite fabrics include laminated, structureless, digitate, intraskeletal and boring-filling, and coatings on debris. Intraskeletal and boring-filling is the first fabric to develop in skeletal voids and borings. It is usually followed by structureless and laminated microbialite, locally overlain by digitate fabric. Microbialite-coated debris can occur at any stage in this succession, including in bioclastic accumulations where the scarce in situ framework builders are mainly encrusting corals. Lipid biomarkers of intermediate to high specificity for sulfate-reducing bacteria, together with δ13C values of these lipids, indicate that microbialite formation was favored by sulfate-reducing bacteria in anoxic microenvironments, probably under high nutrient levels. The microbialite in fore-reef deposits accumulated in the photic zone in water depths of a few to several tens of meters, within small spaces generated by large bioclasts and encrusting corals in the topmost centimeters of the sediment. These crusts that formed on the illuminated surface constitute a previously unrecognized style of microbialite formation in Quaternary reefs. As with the cryptic crusts described from other reef locations, its greatest development occurred during the Last Glacial Maximum and early deglaciation. Microbial carbonate formation during this interval may reflect elevated seawater carbonate saturation corresponding with relatively low levels of atmospheric CO2. © 2018 Elsevier B.V.
英文关键词	Bacterial sulfate reduction; Biomarkers; Carbonate fabrics; Isotopes; Late Pleistocene; Paleoenvironments
语种	英语
scopus关键词	bacterium; barrier reef; biomarker; carbonate; deglaciation; facies; isotope; Last Glacial Maximum; microbialite; Ocean Drilling Program; paleoenvironment; Pleistocene; reduction; sulfate; Australia; Coral Sea; Great Barrier Reef; Queensland; Anthozoa; Bacteria (microorganisms)
来源期刊	Palaeogeography, Palaeoclimatology, Palaeoecology
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/151178
作者单位	Departamento de Estratigrafía y Paleontología, Universidad de Granada, Campus Fuentenueva, Granada, 18002, Spain; Department für Geodynamik und Sedimentologie, Universität Wien, Althanstrasse 14, Wien, A-1090, Austria; Geocoastal Research Group, School of Geosciences, The University of Sydney, Sydney, NSW 2006, Australia; Institut für Geologie, Centrum für Erdsystemforschung und Nachhaltigkeit, Universität Hamburg, Hamburg, 20146, Germany; Centro de Instrumentación Científica, Universidad de Granada, Campus Fuentenueva, Granada, 18002, Spain; Atmosphere and Ocean Research Institute, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8564, Japan; Department of Earth and Planetary Sciences, University of Tennessee, Knoxville, TN 37996, United States; GeoZentrum Nordbayern - Section Paleobiology, University of Erlangen-Nürnberg, Erlangen, 91054, Germany
推荐引用方式 GB/T 7714	Braga J.C.,Puga-Bernabéu Á.,Heindel K.,et al. Microbialites in Last Glacial Maximum and deglacial reefs of the Great Barrier Reef (IODP Expedition 325; NE Australia)[J],2019,514.
APA	Braga J.C..,Puga-Bernabéu Á..,Heindel K..,Patterson M.A..,Birgel D..,...&Riding R..(2019).Microbialites in Last Glacial Maximum and deglacial reefs of the Great Barrier Reef (IODP Expedition 325; NE Australia).Palaeogeography, Palaeoclimatology, Palaeoecology,514.
MLA	Braga J.C.,et al."Microbialites in Last Glacial Maximum and deglacial reefs of the Great Barrier Reef (IODP Expedition 325; NE Australia)".Palaeogeography, Palaeoclimatology, Palaeoecology 514(2019).