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首页> 外文期刊>Journal of Asian earth sciences >P-T path, zircon U-Pb ages and tectonic implications of Devonian pelitic granulites in the southern Chinese Altay orogen
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P-T path, zircon U-Pb ages and tectonic implications of Devonian pelitic granulites in the southern Chinese Altay orogen

机译：P-T路径，Zircon U-PB Ages和Devonian Pelitic Grantits在中国南方的Altay Orogens中的构造影响

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摘要

The Chinese Altay orogen is an important part of the giant Central Asian Orogenic Belt. However, its tectono-metamorphic evolution is still a matter of debate. Here, we report Devonian pelitic granulites at the Wuqiagou area in the southern Chinese Altay orogen. They are characterized by an assemblage of garnet + orthopyroxene + cordierite +/- spinel + biotite + plagioclase +/- K-feldspar + quartz + Fe-Ti oxides. Based on petrographic features and P-T estimates, together with phase equilibrium modeling in the NCKFMASHTO system, three metamorphic stages can be distinguished as follows: (1) pre-peak prograde (M1) stage, with small biotite-plagioclase- or spinel-bearing assemblages preserved as inclusions in garnets and P-T conditions of 4.0 kbar and 700-770 degrees C; (2) peak metamorphic (M2) stage, with an garnet-orthopyroxene-cordierite-bearing assemblage and P-T conditions of 4.2-5.2 kbar and 780-830 degrees C; and (3) post-peak retrograde (M3) stage, with the biotite-plagioclase-bearing intergrowth and P-T conditions of 4.6-5.0 kbar and 690-720 degrees C. P-T estimates and pseudosection modeling define an anticlockwise P-T path involving a post-peak nearly isobaric cooling (IBC) process. SHRIMP and SIMS zircon U-Pb ages of similar to 370 Ma indicate that the granulite-facies metamorphism occurred in the Devonian. Combining these novel constraints with rock associations and their geochemical signatures in this region, we infer that the Devonian granulite facies metamorphism was tightly related to the underplating and heating of mantle-derived magmas as a result of ridge-subduction and the development of slab-window.
机译：中国Altay Orogen是巨型中亚造山带的重要组成部分。然而，它的构造 - 变质演变仍然是辩论的问题。在这里，我们在中国南部的乌桥口地区举报了德文翁鹈鹕粒子。它们的特征在于石榴石+正交性+堇青石+/-尖晶石+ Biotite + Plagioclase +/-K-Feldspar +石英+ Fe-Ti氧化物。基于岩体特征和PT估计，与NCKFASHTO系统中的相位平衡建模一起，可以区分三个变质级：（1）预峰前置型（M1）级，具有小的Biotite-Plagioclase-或丝石轴承组件保存为<4.0 kbar的装甲和Pt条件下的夹杂物，700-770摄氏度; （2）峰变质（M2）阶段，石榴石 - 卵庚酮 - 堇青石组件和P-T条件为4.2-5.2 kbar和780-830℃; （3）后峰逆行（M3）阶段，具有4.6-5.0 kbar和690-720℃的生物素 - 普拉基酶的栖剂生殖和Pt条件.Pt估计和伪质模定义了涉及后的逆时针Pt路径峰值近乎同感冷却（IBC）工艺。虾和SIMS Zircon U-PB年龄类似于370 mA，表明碎石场发生了颗粒状相变质。将这些新颖的约束与岩石协会及其地球化学签名组合在该地区，我们推断德文郡粒状相变质与脊架俯冲和平板窗口的开发的岩石衍生的魔法岩石的底层和加热紧密相关。

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  • 来源
    《Journal of Asian earth sciences》 |2020年第11期|104554.1-104554.16|共16页
  • 作者

    Liu Zhao; Tong Laixi; Bartoli Omar; Li Chao; Xu Yi-Gang; Zhong Zheng;

  • 作者单位

    Northwest Univ Dept Geol State Key Lab Continental Dynam Xian 710069 Peoples R China|Univ Padua Dipartimento Geosci Via Gradenigo 6 I-35131 Padua Italy;

    Northwest Univ Dept Geol State Key Lab Continental Dynam Xian 710069 Peoples R China;

    Univ Padua Dipartimento Geosci Via Gradenigo 6 I-35131 Padua Italy;

    Northwest Univ Dept Geol State Key Lab Continental Dynam Xian 710069 Peoples R China;

    Chinese Acad Sci Guangzhou Inst Geochem State Key Lab Isotope Geochem Guangzhou 510640 Peoples R China;

    Chinese Acad Sci Guangzhou Inst Geochem State Key Lab Isotope Geochem Guangzhou 510640 Peoples R China|Univ Chinese Acad Sci Beijing 100049 Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Chinese Altay orogen; Devonian pelitic granulites; P-T path; Zircon U-Pb ages; Ridge-subduction;

    机译：中国阿尔图orenogen;德文翁鹈鹕粒子;P-T路径;锆石U-PB年龄;山脊俯冲;

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