Grain-scale Sr isotope heterogeneity in amphibolite (retrograded UHP eclogite, Dabie terrane): Implications for the origin and flow behavior of retrograde fluids during slab exhumation

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• 作者：Shun Guo^a ; ^b ; ^{guoshun@mail.iggcas.ac.cn} ; Yueheng Yang^a ; Yi Chen^a ; ^b ; Bin Su^a ; Yijie Gao^a ; Lingmin Zhang^c ; Jingbo Liu^a ; Qian Mao^a
• 关键词：In-situ Sr isotope ; Retrograde fluid ; Amphibolite ; Eclogite ; Dabie UHP terrane ; Epidote
• 刊名：Lithos
• 出版年：2016
• 出版时间：December 2016
• 年：2016
• 卷：266-267
• 期：Complete
• 页码：383-405
• 全文大小：5413 K
• 卷排序：266

文摘

Multiple textural types of epidote with disparate compositions in eclogite and amphibolites were recognized. Grain-scale Sr isotopic heterogeneities in amphibolites indicate multiple origins and flow behavior of the retrograde fluid. Retrograde fluid for growth of most amphibolite minerals was locally derived and flowed in a pervasive manner. Influx of gneiss-derived amphibolite-facies fluid was transient, episodic, and channelized with a long transport distance. In-situ Sr isotopes on Ep/Ap constrain isotopic (dis)equilibrium, fluid origin, and flow regimes in subduction-zone rocks.