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Late Devonian-early Permian subduction-accretion of the Zharma-Saur oceanic arc, West Junggar (NW China): Insights from field geology, geochemistry and geochronology

文献类型：期刊论文

作者Chen, Yichao1,2,3; Xiao, Wenjiao1,2,4; Windley, Brian F.5; Zhang, Ji'en4; Sang, Miao1,2,3; Li, Rui2,4; Song, Shuaihua2,4; Zhou, Kefa1,3
刊名JOURNAL OF ASIAN EARTH SCIENCES
出版日期2017-09-01
卷号145页码:424-445
关键词Zharma-Saur island arc Crustal growth West Junggar CAOB
ISSN号1367-9120
DOI10.1016/j.jseaes.2017.06.010
文献子类Article
英文摘要Migration of arc magmatism is of significant importance for accretionary orogens, but few examples have been documented in ancient orogens. In this paper we report late Paleozoic-early Permian, migrating magmatism of the intra-oceanic Zharma-Saur arc in the Tarbagatay Mountains, West Junggar, NW China, in order to address the general role of a growing arc in accretionary orogenesis, and the debates on the formation and timing of the Kazakhstan orocline in the Central Asian Orogenic Belt (CAOB). Our detailed field work suggests that in the Zharma-Saur arc plutons and dikes intruded and lavas erupted in association with accretionary complexes that were dominated by ocean plate stratigraphy (OPS). Mafic to intermediate magmas have arc-type geochemical signatures such as depleted HFSEs and enrichments in LILEs and LREEs, coupled with high epsilon Nd(t) (+ 5.7 to + 6.8) to low Sr-87/Sr-86 initial values (+0.7035 to +0.7037). The Tarbagatay accreted rocks contain early Paleozoic pillow lavas, which have depleted LILEs, high eNd(t) (+7.4 to +8.2) and high Sr-87/Sr-86 initial values (+0.7041 to +0.7063). These data suggest that the Zharma-Saur arc was an intra-oceanic island arc that developed on accreted OPS material. U-Pb zircon isotopic data (the ZWTB I diorite pluton, 322 +/- 3 Ma; the JLDK diorite pluton, 318 +/- 4 Ma; andesitic lavas, 312 +/- 2 Ma, 310 +/- 4 Ma, 301 +/- 3 Ma) demonstrate that the Zharma-Saur arc magmatism occurred in the late Paleozoic. Integration with published geochronological data on the Zharma-Saur arc leads to a complex model of arc growth with a general southward younging of the arc magmatism from 383 Ma to 262 Ma. These relations imply a southward growth and migration of the magmatic axis of the Zharma-Saur arc that was associated with a short period of ridge subduction. The magmatic activity of the Zharma-Saur arc that probably continued until the early Permian resulted from migrations towards the forearc and backarc, as well as oblique or parallel motion to the trench. These new results not only provide robust evidence for resolving controversies about the Phanerozoic accretionary and continental growth of the Central Asian Orogenic Belt, but also shed light on the migration of magmatisni in accretionary orogens in general.
WOS关键词ZIRCON U-PB ; ASIAN OROGENIC BELT ; MAFIC-ULTRAMAFIC INTRUSION ; NORTH TIEN-SHAN ; TECTONIC IMPLICATIONS ; GEODYNAMIC EVOLUTION ; PALEOZOIC ACCRETIONARY ; PLATE STRATIGRAPHY ; SOUTHERN ALTAIDS ; RIDGE SUBDUCTION
WOS研究方向Geology
语种英语
WOS记录号WOS:000411533600009
出版者PERGAMON-ELSEVIER SCIENCE LTD
资助机构973 Program(2014CB440801) ; 973 Program(2014CB440801) ; National Natural Science Foundation of China(41390441 ; National Natural Science Foundation of China(41390441 ; Chinese Academy of Sciences (CAS)(XDB18020203) ; Chinese Academy of Sciences (CAS)(XDB18020203) ; CAS(QYZDJ-SSW-SYS012) ; CAS(QYZDJ-SSW-SYS012) ; 41230207) ; 41230207) ; 973 Program(2014CB440801) ; 973 Program(2014CB440801) ; National Natural Science Foundation of China(41390441 ; National Natural Science Foundation of China(41390441 ; Chinese Academy of Sciences (CAS)(XDB18020203) ; Chinese Academy of Sciences (CAS)(XDB18020203) ; CAS(QYZDJ-SSW-SYS012) ; CAS(QYZDJ-SSW-SYS012) ; 41230207) ; 41230207) ; 973 Program(2014CB440801) ; 973 Program(2014CB440801) ; National Natural Science Foundation of China(41390441 ; National Natural Science Foundation of China(41390441 ; Chinese Academy of Sciences (CAS)(XDB18020203) ; Chinese Academy of Sciences (CAS)(XDB18020203) ; CAS(QYZDJ-SSW-SYS012) ; CAS(QYZDJ-SSW-SYS012) ; 41230207) ; 41230207) ; 973 Program(2014CB440801) ; 973 Program(2014CB440801) ; National Natural Science Foundation of China(41390441 ; National Natural Science Foundation of China(41390441 ; Chinese Academy of Sciences (CAS)(XDB18020203) ; Chinese Academy of Sciences (CAS)(XDB18020203) ; CAS(QYZDJ-SSW-SYS012) ; CAS(QYZDJ-SSW-SYS012) ; 41230207) ; 41230207)
源URL[http://ir.iggcas.ac.cn/handle/132A11/61972]  
专题地质与地球物理研究所_岩石圈演化国家重点实验室
通讯作者Xiao, Wenjiao
作者单位1.Chinese Acad Sci, Xinjiang Inst Ecol & Geog, Xinjiang Res Ctr Mineral Resources, Urumqi 830011, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Xinjiang Key Lab Mineral Resources & Digital Geol, Urumqi 830011, Xinjiang, Peoples R China
4.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
5.Univ Leicester, Dept Geol, Leicester LE1 7RH, Leics, England
推荐引用方式
GB/T 7714		 Chen, Yichao,Xiao, Wenjiao,Windley, Brian F.,et al. Late Devonian-early Permian subduction-accretion of the Zharma-Saur oceanic arc, West Junggar (NW China): Insights from field geology, geochemistry and geochronology[J]. JOURNAL OF ASIAN EARTH SCIENCES,2017,145:424-445.
APA Chen, Yichao.,Xiao, Wenjiao.,Windley, Brian F..,Zhang, Ji'en.,Sang, Miao.,...&Zhou, Kefa.(2017).Late Devonian-early Permian subduction-accretion of the Zharma-Saur oceanic arc, West Junggar (NW China): Insights from field geology, geochemistry and geochronology.JOURNAL OF ASIAN EARTH SCIENCES,145,424-445.
MLA Chen, Yichao,et al."Late Devonian-early Permian subduction-accretion of the Zharma-Saur oceanic arc, West Junggar (NW China): Insights from field geology, geochemistry and geochronology".JOURNAL OF ASIAN EARTH SCIENCES 145(2017):424-445.

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来源：地质与地球物理研究所

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