Laser ablation ICP-MS screening of corals for diagenetically affected areas applied to Tahiti corals from the last deglaciation

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doi: 10.1016/j.gca.2010.12.011
Author(s): Hathorne, Ed C.; Felis, Thomas; James, Rachael H.; Thomas, Alex
Author Affiliation(s): Primary:
University of Bremen, Centre for Marine Environmental Sciences, Bremen, Germany
Other:
Open University, United Kingdom
Oxford University, United Kingdom
Volume Title: Geochimica et Cosmochimica Acta
Source: Geochimica et Cosmochimica Acta, 75(6), p.1490-1506. Publisher: Elsevier, New York, NY, International. ISSN: 0016-7037 CODEN: GCACAK
Note: In English. Includes appendices. 106 refs.; illus.
Summary: Fossil corals are unique archives of past seasonal climate variability, providing vital information about seasonal climate phenomena such as ENSO and monsoons. However, submarine diagenetic processes can potentially obscure the original climate signals and lead to false interpretations. Here we demonstrate the potential of laser ablation ICP-MS to rapidly detect secondary aragonite precipitates in fossil Porites colonies recovered by Integrated Ocean Drilling Program (IODP) Expedition 310 from submerged deglacial reefs off Tahiti. High resolution (100µm) measurements of coralline B/Ca, Mg/Ca, S/Ca, and U/Ca ratios are used to distinguish areas of pristine skeleton from those afflicted with secondary aragonite. Measurements of coralline Sr/Ca, U/Ca and oxygen isotope ratios, from areas identified as pristine, reveal that the seasonal range of sea surface temperature in the tropical south Pacific during the last deglaciation (14.7 and 11 ka) was similar to that of today. Abstract Copyright (2011) Elsevier, B.V.
Year of Publication: 2011
Research Program: IODP Integrated Ocean Drilling Program
Key Words: 02 Geochemistry; 24 Surficial Geology, Quaternary Geology; Actinides; Anthozoa; Aragonite; Biochemistry; Carbonate rocks; Carbonates; Cenozoic; Chemical composition; Chemical ratios; Cnidaria; Deglaciation; Diagenesis; East Pacific; Expedition 310; French Polynesia; Geochemistry; ICP mass spectra; Integrated Ocean Drilling Program; Invertebrata; Isotope ratios; Isotopes; Laser ablation; Laser methods; Last glacial maximum; Limestone; Mass spectra; Metals; Microbialite; Mineral composition; O-18/O-16; Oceania; Oxygen; Pacific Ocean; Paleoenvironment; Petrography; Pleistocene; Polynesia; Quaternary; Reconstruction; Sea-surface temperature; Sedimentary rocks; Shells; Society Islands; South Pacific; Southeast Pacific; Spectra; Stable isotopes; Tahiti; Tahiti Sea Level Expedition; Upper Pleistocene; Uranium
Coordinates: S174600 S172900 W1492400 W1493600
Record ID: 2011058748
Copyright Information: GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands