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首页> 外文期刊>Canadian journal of earth sciences >Geochemistry, zircon geochronology, and isotopic systematics of the Zhanbuzhale granites in the East Kunlun, Qinghai Province, northwestern China: implications for the tectonic setting
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Geochemistry, zircon geochronology, and isotopic systematics of the Zhanbuzhale granites in the East Kunlun, Qinghai Province, northwestern China: implications for the tectonic setting

机译：中国西北青海省东昆仑东昆仑Zunbuzhale花岗岩的地球化学，锆石地理学和同位素系统：对构造环境的影响

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摘要

The Zhanbuzhale region, in the Eastern Kunlun Orogen of northwestern China, is characterized by large volumes of Phanerozoic granitoid rocks and is an ideal region for investigating the tectonic evolution of the Paleo-Tethys system. However, the exact timing of the final closure of the Paleo-Tethys Ocean and initial continental collision remains controversial because of a lack of precise geochronological and detailed geochemical data. In this paper, we report new zircon U-Pb ages and mineralogical, petrographic, and geochemical data for samples of Middle Triassic granodiorite and alkali feldspar granite from the Zhanbuzhale region. The zircon U-Pb ages indicate that the granodiorite and alkali feldspar granite formed at 239 and 236 Ma, respectively. The granodiorites are high-K talc-alkaline, metaluminous, high Sr content, high SOY ratios, low Y content, and show adakite-like affinities. The alkali feldspar granites display high SiO2, extremely low MgO, and low Zr+Nb+Ce+Y contents as well as low Fe(2)O(3)t/MgO ratios, showing metaluminous to peraluminous and high-K calc-alkaline features. Geochemical and petrological characteristics of the alkali feldspar granites suggest that they are highly fractionated I-type granites. The granodiorites and alkali feldspar granites have zircon epsilon(Hf)(t) values ranging from -2.26 to -0.18, and from -2.17 to +2.18, respectively. Together with regional geological data, we propose that the Triassic (approximately 239-236 Ma) granitoids were generated during the later stages of northward subduction of the Paleo-Tethys oceanic plate, and that the initial stage of collision between the East Kunlun and the Bayan Har-Songpan Ganzi terrane occurred at approximately 236-227 Ma.
机译：在中国西北部的昆仑造山区的詹布兹地区的特点是大量的山星古代花岗岩岩石，是调查古特提斯系统的构造演变的理想地区。然而，由于缺乏精确的地质学和细节地球化学数据，古代Thethys海洋和初始大陆碰撞最终关闭的确切时间仍存在争议。在本文中，我们向詹布兹地区的中间三叠层Granodiorite和碱金属石花岗岩报告新的锆石U-PB Ages和矿物学，岩化和地球化学数据。锆石U-Pb年龄表明，在239和236mA分别形成的Granodiorite和碱金属花岗岩分别形成。 Granodiorites是高k滑石 - 碱性，金属滤光剂，高SR含量，高大豆比，低y含量，以及表现出脂肪酸盐状的亲和力。碱金属花岗岩显示高SiO2，极低的MgO和低Zr + Nb + Ce + Y含量，以及低Fe（2）O（3）T / MgO比，显示出灭菌和高K钙碱的金属滤光剂特征。碱性长石花岗岩的地球化学和岩石学特征表明它们是高度分馏的I型花岗岩。 Granodiorites和碱金属花岗岩具有锆ε（HF）（T）值，范围为-2.26至-0.18，分别为-2.17至+2.18。我们与区域地质数据一起提出，在古代Thethys海洋板材向北俯冲的后期产生三叠层（约239-236 mA）的花岗岩，以及东昆仑与巴丹之间的碰撞初期Har-Songpan Ganzi Terrane发生在大约236-227 mA。

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