Paleozoic subduction erosion involving accretionary wedge sediments in the South Tianshan Orogen: Evidence from geochronological and geochemical studies on eclogites and their host metasediments
文献类型：期刊论文
| 作者 | Liu, Xin1; Su, Wen1; Gao, Jun2; Li, Jilei3; Jiang, Tuo2; Zhang, Xi4; Ge, Xiaomei1 |
| 刊名 | LITHOS
 |
| 出版日期 | 2014-12-01 |
| 卷号 | 210页码:89-110 |
| 关键词 | Tianshan Eclogite Micaschist Zircon U-Pb age Sr-Nd isotope Subduction erosion |
| ISSN号 | 0024-4937 |
| DOI | 10.1016/j.lithos.2014.09.017 |
| 文献子类 | Article |
| 英文摘要 | Geochronological and geochemical data regarding eclogites and their metasedimentary host rocks exposed in two localities of the South Tianshan (U)HP-LT metamorphic belt are presented to reveal the protolith of the eclogites and the provenance of the metasediments. The rim domains of zircon grains from the eclogites contain omphacite, phengite and rutile inclusions and give a U-Pb Concordia age of 321.4 +/- 2.4 Ma, representing the peak of eclogite-facies metamorphism. The core domains of zircon grains with magmatic oscillatory zoning yield a U-Pb Concordia age of 453.9 +/- 9.4 Ma, suggesting a Late Ordovician age for the eclogites' protolith. Furthermore, the inherited cores of some zircon grains have apparent U-Pb ages between 609 Ma and 2305 Ma, implying the involvement of the Precambrian basement in the formation of the edogites' protolith. The depletion of high field strength elements and the trace element ratios indicate the edogite protolith's continental arc affinity. The zircon U-Pb age data of the high-pressure micaschists yield seven age groups ranging from 401 Ma to 3201 Ma and cluster at a pronounced peak of similar to 445 Ma. The major and trace element compositions of the micaschists overlap those of the average upper continental crust The protolith of the micaschist seems to have formed at an accretionary wedge, which is predominantly composed of sediments derived from Ordovician-Si-lurian arc-type magmatic rocks and Precambrian basement rocks in an active continental margin. The basic blocks represented by the protolith of the eclogites were most likely scraped from the basement of a continental arc by basal erosion during the subduction of the South Tianshan Ocean in Late Paleozoic. At the same time, the fragments composing the micaschists' protolith are believed to have been dragged into the subduction channel by the frontal erosion of the accretionary prism. Both the basic blocks and the sediment fragments were forced into the subduction channel, mingled together, and then transported to the deeper parts of a cold subduction zone where they experienced high pressure metamorphism. (C) 2014 Published by Elsevier B.V. |
| WOS关键词 | ULTRAHIGH-PRESSURE METAMORPHISM ; FLUID-ROCK INTERACTION ; P-T PATH ; TRACE-ELEMENT MOBILIZATION ; CONVERGENT PLATE MARGINS ; ZERMATT-SAAS OPHIOLITE ; CHINA PHASE-EQUILIBRIA ; HP-LT ROCKS ; NW-CHINA ; WESTERN TIANSHAN |
| WOS研究方向 | Geochemistry & Geophysics ; Mineralogy |
| 语种 | 英语 |
| WOS记录号 | WOS:000347507600007 |
| 出版者 | ELSEVIER SCIENCE BV |
| 资助机构 | National Natural Science Foundation of China(41172066 ; National Natural Science Foundation of China(41172066 ; National Natural Science Foundation of China(41172066 ; National Natural Science Foundation of China(41172066 ; 41025008) ; 41025008) ; 41025008) ; 41025008) ; National Natural Science Foundation of China(41172066 ; National Natural Science Foundation of China(41172066 ; National Natural Science Foundation of China(41172066 ; National Natural Science Foundation of China(41172066 ; 41025008) ; 41025008) ; 41025008) ; 41025008) ; National Natural Science Foundation of China(41172066 ; National Natural Science Foundation of China(41172066 ; National Natural Science Foundation of China(41172066 ; National Natural Science Foundation of China(41172066 ; 41025008) ; 41025008) ; 41025008) ; 41025008) ; National Natural Science Foundation of China(41172066 ; National Natural Science Foundation of China(41172066 ; National Natural Science Foundation of China(41172066 ; National Natural Science Foundation of China(41172066 ; 41025008) ; 41025008) ; 41025008) ; 41025008) |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/86602]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Su, Wen |
| 作者单位 | 1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China 2.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China 3.Univ Erlangen Nurnberg, GeoZentrum Nordbayern, D-91054 Erlangen, Germany 4.China Minmetals Corp, Beijing 100010, Peoples R China |
| 推荐引用方式 GB/T 7714 | Liu, Xin,Su, Wen,Gao, Jun,et al. Paleozoic subduction erosion involving accretionary wedge sediments in the South Tianshan Orogen: Evidence from geochronological and geochemical studies on eclogites and their host metasediments[J]. LITHOS,2014,210:89-110. |
| APA | Liu, Xin.,Su, Wen.,Gao, Jun.,Li, Jilei.,Jiang, Tuo.,...&Ge, Xiaomei.(2014).Paleozoic subduction erosion involving accretionary wedge sediments in the South Tianshan Orogen: Evidence from geochronological and geochemical studies on eclogites and their host metasediments.LITHOS,210,89-110. |
| MLA | Liu, Xin,et al."Paleozoic subduction erosion involving accretionary wedge sediments in the South Tianshan Orogen: Evidence from geochronological and geochemical studies on eclogites and their host metasediments".LITHOS 210(2014):89-110. |
入库方式： OAI收割
来源：地质与地球物理研究所
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