globalchange  > 过去全球变化的重建
DOI: 10.1016/j.palaeo.2015.09.052
论文题名:
Mg/Ca in fossil oyster shells as palaeotemperature proxy, an example from the Palaeogene of Central Asia
作者: Bougeois L.; de Rafélis M.; Reichart G.-J.; de Nooijer L.J.; Dupont-Nivet G.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2016
卷: 441
起始页码: 611
结束页码: 626
语种: 英语
英文关键词: Central Asia ; Mg/Ca ; Oyster ; Palaeoclimate ; Palaeogene ; Sclerochronology
英文摘要: Fossil oyster shells are well-suited to provide palaeotemperature proxies from geologic to seasonal timescales due to their ubiquitous occurrence from Triassic to Quaternary sediments, the seasonal nature of their shell growth and their relative strong resistance to post-mortem alteration. However, the common use to translate calcitic oxygen isotopes into palaeotemperatures is challenged by uncertainties in accounting for past seawater δ18O, especially in shallow coastal environment where oysters calcify. In principle, the Mg/Ca ratio in oyster shells can provide an alternative palaeothermometer. Several studies provided temperature calibrations for this potential proxy based on modern species, nevertheless their application to palaeo-studies remains hitherto unexplored. Here, we show that past temperature variability in seawater can be obtained from Mg/Ca analyses from selected fossil oyster species and specimens. High-resolution Mg/Ca profiles, combined with δ18O, were obtained along 41 fossil oyster shells of seven different species from the Palaeogene Proto-Paratethys sea (Central Asia) found in similar as well as different depositional age and environments providing comparison. Suitable Mg/Ca profiles, defined by continuous cyclicity and reproducibility within one shell, are found to be consistent for specimens of the same species but differ systematically between species, implying a dominant species-specific effect on the Mg/Ca signal. Two species studied here (Ostrea (Turkostrea) strictiplicata and Sokolowia buhsii) provide an excellent proxy for palaeoclimate reconstruction from China to Europe in Palaeogene marine sediments. More generally, the protocol developed here can be applied to identify other fossil oyster species suitable for palaeoclimate reconstructions. © 2015 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/68632
Appears in Collections:过去全球变化的重建

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作者单位: ISTeP, UMR 7193, Université Pierre et Marie Curie, Paris, France; Géosciences Rennes, UMR-CNRS 6118, Université de Rennes 1, Rennes, France; GET, Observatoire Midi Pyrénées, Université de Toulouse, CNRS, IRD, Toulouse, France; Department of Geosciences, Utrecht University, Utrecht, Netherlands; Department of Geology and Chemical Oceanography, Royal Netherlands Institute for Sea Research, Texel, Netherlands; Department of Earth and Environmental Sciences, Potsdam University, Germany; Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education, Beijing, China

Recommended Citation:
Bougeois L.,de Rafélis M.,Reichart G.-J.,et al. Mg/Ca in fossil oyster shells as palaeotemperature proxy, an example from the Palaeogene of Central Asia[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2016-01-01,441
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