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首页> 外文期刊>Geological Society of America Bulletin >Paleozoic to Mesozoic deformation of eastern Cathaysia: A case study of the Chencai complex, Zhejiang Province, eastern China, and its tectonic implications
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Paleozoic to Mesozoic deformation of eastern Cathaysia: A case study of the Chencai complex, Zhejiang Province, eastern China, and its tectonic implications

机译：古生代至州东部的中生代变形：以浙江省东部，浙江省山地复合体为例及其构造效应

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The early Paleozoic orogeny in South China created an important orogenic belt in East Asia, which possibly extends southwest to the Indochina block and northeast to the Korean Peninsula. Although this orogeny is interpreted as one of the examples of intraplate orogenesis in the world, the driver for the orogeny and its deformation details are poorly understood. In this study, we provide detailed structural analysis of the basement of the northeastern Cathaysia block (i.e., Chencai complex) with geochronological constraints. We combine previous studies with ours and obtain the following results. (1) The Chencai complex has experienced multiple metamorphic and deformation events since the early Paleozoic. The earliest deformation was northward thrusting at ca. 460-420 Ma (Dn+1a), which resulted in the thickening of the crust and coeval regional metamorphism (high-grade amphibolite to granulite facies). During the late stages of the orogeny (ca. 420-390 Ma, Dn+1b), the crust was extended and thinned; metamorphism and deformation during this stage erased the information from earlier stage(s). This early deformation (Dn+1) may have resulted from an intraplate orogeny and may have been a response to the Kuungan orogeny or Bhimphedian orogeny to the south, which caused the final assembly of Gondwana. The Jiangshan-Shaoxing fault belt was a sinistral ductile shear zone that formed to accommodate deformation between the Yangtze block and the eastern Cathaysia block. The Cathaysia block moved northward during the early Paleozoic and compressed the eastern Yangtze block. (2) During the Triassic, the Chencai complex experienced folding, forming northeast-southwest-trending close isoclinal folds as part of the regional thrust system along the southeastern margin of the Yangtze block at this time (Dn+2). (3) A group of northeast-southwest-trending thrusts cut the Chencai complex and placed it directly onto the Jiangshan-Shaoxing fault belt during the Late Jurassic (Dn+3). The main structures in the studied outcrops of the Chencai complex formed during the Triassic and Jurassic, not the early Paleozoic. (4) The fourth deformation event of the Chencai complex was a series of northwest-southeast-trending open folds that may have developed during the Cenozoic.
机译：南方古生代山谷在东亚创造了一个重​​要的造山带，这可能延伸到印度印第安纳街区和东北部到朝鲜半岛。虽然这种organy被解释为世界上血管内奥发生的例子之一，但逆戟醛的驾驶员及其变形细节知之甚少。在这项研究中，我们为东北安战（即，Chencai Complex）的地下室提供了详细的结构分析，具有地理学约束。我们将以前的研究与我们的研究结合起来并获得以下结果。 （1）由于早期古生代以来，Chencai Complex经历了多种变质和变形事件。最早的变形是在加利福的向北推动。 460-420 mA（DN + 1A），导致地壳和群体区域变质（高级倒置至粒状相）增厚。在Orogeny（CA.420-390 MA，DN + 1B）的后期阶段，地壳延伸和变薄;在此阶段的变质和变形删除了早期阶段的信息。这种早期变形（DN + 1）可能是由血管内or发生的影响，并且可能是对南部的Kuungan Orogeny或Bhamphedian Orogeny的反应，这导致了Gondwana的最终组装。江山 - 绍兴断层带是一个尖叫型铸造剪力区，形成为适应长江块和东部的东部的变形。在古生代的早期古生代和压缩东部的长江街区时，正管挡住了向北移动。 （2）在三叠纪期间，山买复杂经历了折叠，形成东北 - 西南趋势紧密的异形折叠，作为沿着长江块的东南部边缘的区域推力系统的一部分（DN + 2）。 （3）一群东北 - 西南趋势推力削减了Chencai Complex，并在侏罗纪晚期（DN + 3）期间直接放在江山 - 绍兴断层带上。在三叠系和侏罗纪形成的Chencai复合物的研究中的主要结构，而不是早期古生代。 （4）Chencai Complex的第四个变形事件是一系列西北追逐开放折叠，可能在新生代开发。

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    Zhang Jin; Qu Junfeng; Zhang Beihang; Zhao Heng; Wang Yannan; Lu Miaoan;

  • 作者单位

    Chinese Acad Geol Sci Inst Geol Beijing 100037 Peoples R China;

    Chinese Acad Geol Sci Inst Geol Beijing 100037 Peoples R China;

    Chinese Acad Geol Sci Inst Geol Beijing 100037 Peoples R China;

    Chinese Acad Geol Sci Inst Geol Beijing 100037 Peoples R China;

    Chinese Acad Sci Xinjiang Inst Ecol &

    Geog Urumqi 830011 Peoples R China;

    Chinese Acad Geol Sci Inst Geol Beijing 100037 Peoples R China;

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  • 正文语种 eng
  • 中图分类 地质学;
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