The control of carbonate mineral Mg isotope composition by aqueous speciation: Theoretical and experimental modeling
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- 作者：Jacques Schotta ; jacques.schott@get.obs-mip.fr" class="auth_mail" title="E-mail the corresponding author ; Vasileios Mavromatisa ; b ; Toshiyuki Fujiic ; Christopher R. Pearced ; Eric H. Oelkersa ; e
- 关键词：Mg isotopes ; Carbonates ; First principles calculations ; Mg speciation ; Seawater δ26Mg
- 刊名：Chemical Geology
- 出版年：2016
- 出版时间：16 December 2016
- 年：2016
- 卷：445
- 期：Complete
- 页码：120-134
- 全文大小：1865 K
文摘
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First theoretical and experimental determination of equilibrium fractionation for 26Mg/24Mg among inorganic and organic aqueous Mg species.
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Mg bicarbonate and carbonate complexes are strongly enriched in 26Mg compared to Mg2+(aq).
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Mg carboxylate complexes can be either enriched in heavy or light Mg isotopes compared to Mg2 +(aq).
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The interpretation of the Mg isotopic record of marine carbonates requires taking account of aqueous Mg speciation in the forming fluids.