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首页> 外文期刊>Journal of Asian earth sciences >Geochemistry and geochronology of acidic rocks in the Beishan region,NW China: Petrogenesis and tectonic implications
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Geochemistry and geochronology of acidic rocks in the Beishan region,NW China: Petrogenesis and tectonic implications

机译：中国西北地区北山地区酸性岩石的地球化学和年代学：岩石成因和构造意义

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摘要

The dacites and granites from the Beishan region are characterized by highly-fractionated REE, enrichments in LILE, and depletion in Nb, Ta and Sr. The dacites contain zircons with ages ranging from 265 to 748 Ma. These features suggest that they were probably derived from the older lower continental crust and were later on subjected to significant crustal assimilation. The rhyolites, diorites and diabases, all of which share similar geochemical features such as trace element patterns, zircon U-Pb ages of ～280 Ma, positive ε_(Hf)(t) and ε_(Nd)(t), high initial (~(87)Sr/~(86)Sr)i and δ~(18)O‰ values, were most likely derived from the juvenile crustal sources and subsequently experienced fractional crystallization and crustal contamination. These acidic igneous rocks (except dacites and granites) and coeval mafic-ultramafic intrusions form a bimodal igneous series. This implies that the Beishan region was a Late Paleozoic rift probably developed in association with the early Permian mantle plume activity in the Tarim Basin.
机译：北山地区的dacites和花岗岩具有高分馏的REE，LILE富集和Nb，Ta和Sr的贫化的特征。dacites的锆石年龄在265至748 Ma之间。这些特征表明它们可能源自较旧的下部大陆壳，后来又经历了明显的地壳同化作用。流纹岩，闪长岩和辉绿岩都具有相似的地球化学特征，如微量元素分布，锆石U-Pb年龄〜280 Ma，正ε_（Hf）（t）和ε_（Nd）（t），高初始值（ 〜（87）Sr /〜（86）Sr）i和δ〜（18）O‰值最有可能来自幼年地壳源，随后经历了部分结晶和地壳污染。这些酸性火成岩（除了Dacites和花岗岩之外）和同时期的镁铁质-超镁铁质侵入体形成了双峰火成岩系列。这意味着北山地区是晚古生代裂谷，可能与塔里木盆地的二叠纪早期地幔柱活动有关。

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  • 来源
    《Journal of Asian earth sciences》 |2011年第1期|p.31-43|共13页
  • 作者

    Ben-Xun Su; Ke-Zhang Qin; Patrick Asamoah Sakyi; Ping-Ping Liu; Dong-Mei Tang; Sanjeewa P.K. Malaviarachchi; Qing-Hua Xiao; He Sun; Yu-Cai Dai; Yan Hu;

  • 作者单位

    Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, P.O. Box 9825, Beijing 100029, China,State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, P.O. Box 9825, Beijing 100029, China;

    Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, P.O. Box 9825, Beijing 100029, China;

    Department of Earth Science, University of Ghana, P.O. Box LG 58, Legon-Accra. Ghana;

    Department of Earth Sciences, The University of Hong Kong, Pakfulam Road, Hong Kong, China;

    Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, P.O. Box 9825, Beijing 100029, China;

    Research School of Earth Sciences, The Australian National University, Building 61, Mills Road Acton, Canberra, Act 0200, Australia;

    Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, P.O. Box 9825, Beijing 100029, China;

    Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Sciences, P.O. Box 9825, Beijing 100029, China,State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, P.O. Box 9825, Beijing 100029, China;

    No. 6 Geological Party, Xinjiang Bureau of Geology and Mineral Resources, Hami 839000, China;

    State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, P.O. Box 9825, Beijing 100029, China;

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  • 正文语种 eng
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  • 关键词

    beishan; central asian orogenic belt; dacite; magmatism; rhyolite; zircon u-pb-hf-o isotopes;

    机译：北山;中亚造山带;针铁矿;岩浆作用;流纹岩;锆石u-pb-hf-o同位素;

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