Calcium isotope fractionation in modern scleractinian corals

被引：126

作者：

Boehm, Florian ^{[1
]}

Gussone, Nikolaus

Eisenhauer, Anton

Dullo, Wolf-Christian

Reynaud, Stephanie

Paytan, Adina

机构：

[1] IFM, Leibniz Inst Meereswissensch, GEOMAR, Kiel, Germany

[2] Univ Bremen, DFG Forschungszentrum Ozeanrander, Bremen, Germany

[3] Ctr Sci Monaco, Monaco, Monaco

[4] Stanford Univ, Dept Geol & Environm Sci, Stanford, CA 94305 USA

来源：

GEOCHIMICA ET COSMOCHIMICA ACTA | 2006年 / 70卷 / 17期

关键词：

D O I：

10.1016/j.gca.2006.06.1546

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 [地球物理学]; 070902 [地球化学];

摘要：

The Ca-44/Ca-40 ratios of cultured (Acropora sp.) and open ocean (Pavona clavus, Porites sp.) tropical reef corals are positively correlated with growth temperature. The slope of the temperature-fractionation relation is similar to inorganic aragonite precipitates. However, delta(44)/Ca-40 of the coral aragonite is offset from inorganic and sclerosponge aragonite by about +0.5 parts per thousand. This offset can neither be explained by the very fast, biologically controlled calcification of scleractinian corals, nor as a consequence of calcification from a partly closed volume of fluid. As corals actively transport calcium through several cell layers to the site of calcification, the most likely explanation for the offset is a biologically induced fractionation. Our results indicate a limited use of Ca isotopes in scleractinian corals as temperature proxy. (c) 2006 Elsevier Inc. All rights reserved.

引用

页码：4452 / 4462

页数：11

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