Late Quaternary sea-surface temperatures in the western Coral Sea; implications for the growth of the Australian Great Barrier Reef

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doi: 10.1130/G21595AR.1
Author(s): Lawrence, K. T.; Herbert, T. D.
Author Affiliation(s): Primary:
Brown University, Department of Geological Sciences, Providence, RI, United States
Volume Title: Geology (Boulder)
Source: Geology (Boulder), 33(8), p.677-680. Publisher: Geological Society of America (GSA), Boulder, CO, United States. ISSN: 0091-7613 CODEN: GLGYBA
Note: In English. With GSA Data Repository Item 2005126. 22 refs.; illus.
Summary: Recent chronostratigraphic evidence suggests that the central Australian Great Barrier Reef formed within the past 780 k.y. Periplatform sediments of the same age recovered from the western Coral Sea record a progressive decrease in the δ18O of planktonic foraminifera to the present. Several investigators have proposed that this trend represents an appreciable late Pleistocene warming (∼4°C) of ocean surface temperatures, which they posit catalyzed the growth of the Great Barrier Reef. Contrary to this hypothesis, we demonstrate using alkenone paleothermometry (U37k') on sediments from Ocean Drilling Program (ODP) Site 820 that sea-surface temperatures (SSTs) in the western Coral Sea changed by ∼1.5°C or less during the past ∼800 k.y. If the central Great Barrier Reef rose in the late Quaternary, it was therefore not due to a warming of SSTs. We explore whether a major moisture balance change and/or diagenetic alteration of calcareous microfossils can explain the higher δ18O values observed at depth in the planktonic δ18O record at ODP Site 820. Our results suggest that diagenesis provides a large isotopic overprint.
Year of Publication: 2005
Research Program: ODP Ocean Drilling Program
Key Words: 02 Geochemistry; 24 Surficial Geology, Quaternary Geology; Alkenones; Alteration; Australasia; Australia; Biochemistry; Cenozoic; Coral Sea; Diagenesis; Foraminifera; Geochemistry; Geologic thermometry; Glacial environment; Glaciomarine environment; Great Barrier Reef; Holocene; Interglacial environment; Invertebrata; Isotope ratios; Isotopes; Ketones; Last glacial maximum; Leg 133; Marine environment; Marine sediments; Microfossils; O-18/O-16; ODP Site 820; Ocean Drilling Program; Organic compounds; Overprinting; Oxygen; Pacific Ocean; Paleo-oceanography; Paleoecology; Planktonic taxa; Protista; Quaternary; Queensland Australia; Reef environment; SEM data; Sea-surface temperature; Sediments; South Pacific; Southwest Pacific; Stable isotopes; Upper Quaternary; West Pacific
Coordinates: S163814 S163813 E1461814 E1461813
Record ID: 2005048157
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