Mg and Ca isotope fractionation during CaCO3 biomineralisation

被引：147

作者：

Chang, VTC

Williams, RJP

Makishima, A

Belshawl, NS

O'Nions, RK

机构：

[1] Univ Oxford, Dept Earth Sci, Oxford OX1 3PR, England

[2] Univ Oxford, Dept Chem, Oxford OX1 3QR, England

[3] Okayama Univ, Inst Study Earths Interior, Pheasant mem Lab Geochem & Cosmochem, Tottori 6820193, Japan

来源：

BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS | 2004年 / 323卷 / 01期

关键词：

D O I：

10.1016/j.bbrc.2004.08.053

中图分类号：

Q5 [生物化学]; Q7 [分子生物学];

学科分类号：

071010 ; 081704 ;

摘要：

The natural variation of Mg and Ca stable isotopes of carbonates has been determined in carbonate skeletons of perforate foraminifera and reef coral together with Mg/Ca ratios to assess the influence of biomineralisation processes. The results for coral aragonite suggest its formation, in terms of stable isotope behaviour, approximates to inorganic precipitation from a seawater reservoir. In contrast, results for foraminifera calcite suggest a marked biological control on Mg isotope ratios presumably related to its low Mg content compared with seawater. The bearing of these observations on the use of Mg and Ca isotopes as proxies in paleoceanography is considered. (C) 2004 Elsevier Inc. All rights reserved.

引用

页码：79 / 85

页数：7

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