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Poly-cyclic Metamorphic Evolution of Eclogite: Evidence for Multistage Burial-Exhumation Cycling in a Subduction Channel

文献类型：期刊论文

作者Li, Ji-Lei1,2; Klemd, Reiner2; Gao, Jun1; John, Timm3
刊名JOURNAL OF PETROLOGY
出版日期2016
卷号57期号:1页码:119-146
关键词subduction channel Chinese Tianshan eclogite poly-cyclic metamorphism polyphase mineral growth pseudosection P-T path
DOI10.1093/petrology/egw002
文献子类Article
英文摘要(Ultra-)high-pressure [(U)HP] eclogites provide direct evidence for metamorphic processes at mantle depths in subduction zones. Textural evidence and pressure-temperature (P-T) path reconstruction allow a unique opportunity to constrain the geodynamic processes along the plate interface. To better understand the dynamics of subduction channels, we present a detailed petrographical, petrological and pseudosection modeling study of a metamorphically complex HP eclogite sample from a tectonic block of the Akeyazi (U)HP metamorphic terrane in the Chinese Tianshan. Mineral chemical variations and textural discontinuities show that all the major phases of the rock (garnet, epidote, clinopyroxene and amphibole) display multiple growth zones compatible with a poly-cyclic evolution including two burial-exhumation cycles. The precise P-T path derived from thermodynamic modeling based on effective bulk compositions suggests that the eclogite underwent complex burial-exhumation cycles with two P-T loops indicated by the occurrence of polyphase garnet and mutually replaced and regrown amphibole. It is suggested that the eclogite sample, which represents a relic of tectonically detached oceanic crust, underwent two burial-exhumation cycles during convective flow in a subduction channel. This natural occurrence is consistent with numerical simulation studies showing that pressure cycling is to be expected for deeply subducted oceanic crust in a subduction channel. The modeled exhumation process for the eclogite sample corresponds to a previously suggested subduction channel exhumation model for the Akeyazi (U)HP rocks.
WOS关键词P-T PATH ; PRESSURE-TEMPERATURE PATH ; FLUID-ROCK INTERACTION ; SOUTH TIANSHAN OROGEN ; TRACE-ELEMENT MOBILIZATION ; HP-LT ROCKS ; NW-CHINA ; WESTERN TIANSHAN ; TECTONIC IMPLICATIONS ; PHASE-EQUILIBRIA
WOS研究方向Geochemistry & Geophysics
语种英语
WOS记录号WOS:000374572600006
资助机构National Natural Science Foundation of China(41390445 ; National Natural Science Foundation of China(41390445 ; China Postdoctoral Science Foundation(2015T80135 ; China Postdoctoral Science Foundation(2015T80135 ; Deutsche Forschungsgemeinschaft(KL692/17-3) ; Deutsche Forschungsgemeinschaft(KL692/17-3) ; IGCP(592) ; IGCP(592) ; 41502053) ; 41502053) ; 2014M560114) ; 2014M560114) ; National Natural Science Foundation of China(41390445 ; National Natural Science Foundation of China(41390445 ; China Postdoctoral Science Foundation(2015T80135 ; China Postdoctoral Science Foundation(2015T80135 ; Deutsche Forschungsgemeinschaft(KL692/17-3) ; Deutsche Forschungsgemeinschaft(KL692/17-3) ; IGCP(592) ; IGCP(592) ; 41502053) ; 41502053) ; 2014M560114) ; 2014M560114)
源URL[http://ir.iggcas.ac.cn/handle/132A11/53514]  
专题地质与地球物理研究所_中国科学院矿产资源研究重点实验室
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, POB 9825, Beijing 100029, Peoples R China
2.Univ Erlangen Nurnberg, GeoZentrum Nordbayern, Schlossgarten 5a, D-91054 Erlangen, Germany
3.Free Univ Berlin, Inst Geol Wissensch, Malteserstr 74-100, D-12449 Berlin, Germany
推荐引用方式
GB/T 7714		 Li, Ji-Lei,Klemd, Reiner,Gao, Jun,et al. Poly-cyclic Metamorphic Evolution of Eclogite: Evidence for Multistage Burial-Exhumation Cycling in a Subduction Channel[J]. JOURNAL OF PETROLOGY,2016,57(1):119-146.
APA Li, Ji-Lei,Klemd, Reiner,Gao, Jun,&John, Timm.(2016).Poly-cyclic Metamorphic Evolution of Eclogite: Evidence for Multistage Burial-Exhumation Cycling in a Subduction Channel.JOURNAL OF PETROLOGY,57(1),119-146.
MLA Li, Ji-Lei,et al."Poly-cyclic Metamorphic Evolution of Eclogite: Evidence for Multistage Burial-Exhumation Cycling in a Subduction Channel".JOURNAL OF PETROLOGY 57.1(2016):119-146.

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来源：地质与地球物理研究所

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