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Earliest diagenesis in scleractinian coral skeletons : implications for palaeoclimate-sensitive geochemical archives

Nothdurft, Luke & Webb, Gregory (2009) Earliest diagenesis in scleractinian coral skeletons : implications for palaeoclimate-sensitive geochemical archives. Facies, 55(2), pp. 161-201.

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Abstract

Live-collected samples of four common reef building coral genera (Acropora, Pocillopora, Goniastrea, Porites) from subtidal and intertidal settings of Heron Reef, Great Barrier Reef, show extensive early marine diagenesis where parts of the coralla less than 3 years old contain abundant macro- and microborings and aragonite, high-Mg calcite, low-Mg calcite, and brucite cements. Many types of cement are associated directly with microendoliths and endobionts that inhabit parts of the corallum recently abandoned by coral polyps. The occurrence of cements that generally do not precipitate in normal shallow seawater (e.g., brucite, low-Mg calcite) highlights the importance of microenvironments in coral diagenesis. Cements precipitated in microenvironments may not reXect ambient seawater chemistry. Hence, geochemical sampling of these cements will contaminate trace-element and stable-isotope inventories used for palaeoclimate and dating analysis. Thus, great care must be taken in vetting samples for both bulk and microanalysis of geochemistry. Visual inspection using scanning electron microscopy may be required for vetting in many cases.

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18 citations in Scopus
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15 citations in Web of Science®

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ID Code: 28620
Item Type: Journal Article
Keywords: Early diagenesis, Coral, Skeletal modification, Scleractinia, Cementation, Bioerosion, Porites
DOI: 10.1007/s10347-008-0167-z
ISSN: 1612-4820
Subjects: Australian and New Zealand Standard Research Classification > EARTH SCIENCES (040000) > GEOLOGY (040300)
Divisions: Past > Schools > Biogeoscience
Past > QUT Faculties & Divisions > Faculty of Science and Technology
Deposited On: 16 Nov 2009 10:35
Last Modified: 29 Feb 2012 23:59

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