Investigation of Ge and Ga exchange behaviour and Ge isotopic fractionation during subduction zone metamorphism

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• 作者：Afifé ; El Korh^a ; ^{elkorh@crpg.cnrs-nancy.fr} ; Bé ; atrice Luais^a ; Marie-Christine Boiron^b ; Etienne Deloule^a ; Damien Cividini^a
• 关键词：Germanium ; Gallium ; Ge isotopes ; Subduction ; Fluid-rock interactions ; HP&ndash ; LT metamorphism
• 刊名：Chemical Geology
• 出版年：2017
• 出版时间：20 January 2017
• 年：2017
• 卷：449
• 期：Complete
• 页码：165-181
• 全文大小：2133 K
• 卷排序：449

文摘

The HP–LT metabasites of the Ile de Groix have Ge, Ga and δ74Ge values typical of basalts. Ge and Ga are only weakly mobile during subduction zone metamorphism. No significant Ge isotopes fractionation during HP dehydration reactions in metabasites. Ge isotopes may fractionate during intensive rehydration reactions in the greenschist facies. Subducted metapelites may generated local Ge isotopic heterogeneities in the mantle wedge.