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Title of Journal: Contrib Mineral Petrol

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Abbravation: Contributions to Mineralogy and Petrology

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Springer Berlin Heidelberg

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DOI

10.1002/chin.200824226

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1432-0967

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In situ Sr isotopic analyses of epidote tracing t

Authors: Shun Guo Kai Ye Yueheng Yang Yi Chen Lingmin Zhang Jingbo Liu Qian Mao Yuguang Ma
Publish Date: 2014/02/14
Volume: 167, Issue: 2, Pages: 975-
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Abstract

This study presents in situ strontium Sr isotope and Sr content data on multistage epidote crystals from ultrahighpressure UHP eclogites and omphacite–epidote veins therein at Ganghe Dabie terrane China determined using LAMCICPMS The Ganghe eclogites occur as lenses in mainly leucocratic UHP gneisses and therefore our data provide insights into the origin composition and transport scale of the discrete multistage fluids in UHP eclogites during the subduction and exhumation of a continental crust Four textural types of epidote that record compositional and isotopic signatures of fluid at various metamorphic P–T conditions have been distinguished based on petrographic observations and compositional analyses They are 1 finegrained highpressure HP epidote inclusions EpIn in omphacite that define the earliest stage of epidote formation in the eclogite 2 coarsegrained UHP epidote porphyroblasts EpP that contain omphacite with EpIn inclusions in the eclogite 3 finegrained HP epidote in omphacite–epidote veins EpV as well as 4 the lateststage epidote in disseminated amphibolitefacies veinlets EpA which crosscut the EpP or matrix minerals in the eclogite and HP vein Both EpP and EpV crystals exhibit significant and complex chemical zonations with respect to the XFe = Fe/Fe + Al ratio and Sr content In contrast to the varying Sr contents EpIn EpP and EpV have similar and narrow ranges of initial 87Sr/86Sr ratios from 070692 to 070720 for EpIn from 070698 to 070721 for EpP and from 070668 to 070723 for EpV which are significantly different from those in EpA from 070894 to 071172 The initial 87Sr/86Sr ratio of EpA is closer in value to the initial Sr isotopic composition of the gneisses from 0710790 to 0712069 which enclose the UHP eclogite These data indicate different sources of the eclogitefacies fluids and retrograde amphibolitefacies fluid in the Ganghe eclogites The HP–UHP fluids responsible for the large amounts of hydrous minerals in the eclogites were internally derived and buffered The omphacite–epidote veins were precipitated from the channelized soluterich HP–UHP fluids released from the host eclogite However hydrated amphibolitefacies metamorphism during exhumation was mainly initiated by the lowSr and high87Sr/86Sr external fluid which infiltrated into the eclogite from the surrounding gneisses The eclogitefacies fluids in the Ganghe eclogites were locally derived whereas the infiltration of the retrograde amphibolitefacies fluid from the gneisses required a long transport most likely longer than 80 m This study highlights that the in situ Sr isotopic analysis of multistage epidote can be employed as a powerful geochemical tracer to provide key information regarding the origin and behavior of variousstage subductionzone metamorphic fluidsThis study was supported by The National Basic Research Program of China 973 Program 2009CB825001 and The National Science Foundation of China Nos 41102034 41372079 and 41090371 We gratefully acknowledge the constructive comments and suggestions from Drs Feineman M and KonradSchmolke M which considerably improved the manuscript Careful editorial handling by T L Grove is highly appreciated We thank Liewen Xie Zhichao Liu Qin Zhou and Jing Sun for assistance in the LAMCICPMS analyses Chaofeng Li and Xianghui Li for assistance in the TIMS analyses Professors WeiPing Wu and YongHong Shi for help in the field


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