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首页> 外文期刊>Journal of Asian earth sciences >Thermochronological constraints on the late Paleozoic tectonic evolution of the southern Chinese Altai
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Thermochronological constraints on the late Paleozoic tectonic evolution of the southern Chinese Altai

机译：中国南方阿尔泰晚古生代构造演化的热年代学约束

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摘要

The Chinese Altai, as an accretionary orogen developing from the Cambrian to Carboniferous, was modified by Permian deformation, metamorphism and magmatism in response to the collision with the East Junggar. The tectonic processes of the collision and the timing of related deformation and metamorphism are still enigmatic. Here we present new Ar-40/Ar-39 dating results for granitic gneisses and amphibolites exposed in the Qiongkuer Domain in two areas (Alahake and Fuyun) of the southern Chinese Altai. The amphiboles from both Aalaheke and Fuyun areas yield consistent Ar-40/Ar-39 plateau ages at 265.9 +/- 1.7 Ma and 270.1 +/- 3.1 Ma. In contrast, the biotites from two areas show distinct Ar-40/Ar-39 ages of 232.0 +/- 2.1 Ma and 226.8 +/- 1.7 Ma for the Alahake area, and 245.1 +/- 1.5 Ma and 264.5 +/- 2.2 Ma for the Fuyun area, respectively. Given that Ar-40/Ar-39 ages are younger than the Permian high temperature metamorphism at similar to 299-277 Ma as constrained by metamorphic zircons in the Qiongkuer Domain, we interpret these Ar-40/Ar-39 ages to record the cooling history of two areas. Compatible amphibole ages in both areas indicate a similar exhumation age along the Qiongkuer Domain cooling through 550 degrees C at similar to 270-265 Ma, which may have been associated with the development of the sinistral Emis Shear Zone during the collision between the Chinese Altai and the East Junggar. The subsequent exhumation processes were variable in different areas of the Qiongkuer Domain as showed by the distinct biotite ages, which may indicate along-strike variation of cooling processes from 550 degrees C to 300 degrees C in the Qiongkuer Domain. (c) 2014 Elsevier Ltd. All rights reserved.
机译：作为与寒武纪向石炭纪发展的增生造山带，中国的阿尔泰因与东准gar尔的碰撞而受到二叠纪形变，变质作用和岩浆作用的影响。碰撞的构造过程以及相关变形和变质的时间仍然是未知的。在这里，我们给出了在中国南部阿尔泰地区两个地区（阿拉哈克和富蕴）琼古尔地区暴露的花岗岩片麻岩和闪石的新Ar-40 / Ar-39测年结果。来自Aalaheke和Fuyun地区的闪石产生一致的Ar-40 / Ar-39高原年龄，分别为265.9 +/- 1.7 Ma和270.1 +/- 3.1 Ma。相反，来自两个地区的黑云母显示Alahake地区的Ar-40 / Ar-39年龄分别为232.0 +/- 2.1 Ma和226.8 +/- 1.7 Ma，以及245.1 +/- 1.5 Ma和264.5 +/- 2.2马分别为阜云地区。鉴于Ar-40 / Ar-39年龄比琼二尔地区变质锆石所约束的类似299-277 Ma的二叠纪高温变质还年轻，我们解释这些Ar-40 / Ar-39年龄来记录冷却两个领域的历史。这两个地区的闪石年龄均相符，表明琼古尔地区的掘尸年龄与270-265 Ma相似，在550°C的温度下冷却至550°C，这可能与中国阿尔泰与阿尔梅斯碰撞期间的鼻窦Emis剪切带的发展有关。东准gar尔。随后的掘进过程在琼库尔域的不同区域是可变的，这由不同的黑云母年龄所表明，这可能表明琼库尔域的冷却过程从550摄氏度到300摄氏度的沿走动变化。 （c）2014 Elsevier Ltd.保留所有权利。

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  • 来源
    《Journal of Asian earth sciences》 |2015年第1期|51-60|共10页
  • 作者

    Li Pengfei; Yuan Chao; Sun Min; Long Xiaoping; Cai Keda;

  • 作者单位

    Univ Hong Kong, Dept Earth Sci, Hong Kong, Hong Kong, Peoples R China|Univ Hong Kong, Shenzhen Inst Res & Innovat, Hong Kong, Hong Kong, Peoples R China;

    Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochronol & Geochem, Guangzhou 510640, Guangdong, Peoples R China;

    Univ Hong Kong, Dept Earth Sci, Hong Kong, Hong Kong, Peoples R China|Univ Hong Kong, Shenzhen Inst Res & Innovat, Hong Kong, Hong Kong, Peoples R China;

    Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochronol & Geochem, Guangzhou 510640, Guangdong, Peoples R China;

    Chinese Acad Sci, Xinjiang Inst Ecol & Geog, Xinjiang Res Ctr Mineral Resources, Urumqi 830011, Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Central Asian Orogenic Belt; Chinese Altai; Qiongkuer Domain; Erqis Shear Zone; Ar-40/Ar-39 thermochronology;

    机译：中亚造山带中国阿尔泰琼古尔地区额尔齐斯剪切带Ar-40 / Ar-39热年代学;

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