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首页> 外文期刊>Journal of Asian earth sciences >Early Paleozoic tectonic evolution of the Xing-Meng Orogenic Belt: Constraints from detrital zircon geochronology of western Erguna-Xing'an Block, North China
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Early Paleozoic tectonic evolution of the Xing-Meng Orogenic Belt: Constraints from detrital zircon geochronology of western Erguna-Xing'an Block, North China

机译：兴萌造山带的古生代早期构造演化：华北西部额尔古纳-兴安块体碎屑锆石年代学的制约

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摘要

To better constrain the Early Paleozoic tectonic evolution of the western part of the Erguna-Xing'an Block, detrital zircon U-Pb dating was applied on the Ordovician to Devonian sedimentary strata along the southeast part of the China-Mongolia border. Most of the zircons from five sedimentary samples display fine-scale oscillatory growth zoning and Th/U ratios higher than 0.1, indicating a magmatic origin. All five Ordovician-Devonian samples display the similar age distribution patterns with age groups at ～440 Ma, ～510 Ma, ～800 Ma, ～950 Ma, and few Meso- to Paleo-Proterozoic and Neoarchean grains. This age distribution pattern is similar to those from adjacent blocks in the southeastern Central Asian Orogenic Belt. Considering previous tectonic studies, we propose bidirectional provenances from the Erguna-Xing'an Block and Baolidao Arc. Consequently, a new model was proposed to highlight the Early Paleozoic tectonic evolution of the western Erguna-Xing'an Block, which constrains two main Early Paleozoic tectonic events of the Xing-Meng Orogenic Belt: (a) pre-Late Cambrian collision between Erguna-Kerulen Block and Arigin Sum-Xilinhot-Xing'an Block; (b) the Early Paleozoic subduction of Paleo-Asian Ocean and pre-Late Devonian collision between Erguna-Xing'an Block and Songliao-Hunshandake Block.
机译：为了更好地限制额尔古纳—兴安地块西部的早古生代构造演化，在中国-蒙古边界东南部的奥陶纪至泥盆纪沉积地层应用了碎屑锆石U-Pb定年。来自五个沉积物样品的大多数锆石显示出细尺度的振荡生长区带，Th / U比值大于0.1，表明岩浆成因。所有五个奥陶纪-德文系样品均显示出相似的年龄分布格局，其中年龄组分别为〜440 Ma，〜510 Ma，〜800 Ma，〜950 Ma，并且中，古元古代和新古生界的晶粒很少。这种年龄分布模式类似于中亚东南部造山带东南部相邻区块的年龄分布模式。考虑到以前的构造研究，我们提出了额尔古纳-兴安地块和宝力岛弧的双向物源。因此，提出了一个新的模型来强调埃尔古纳-兴安西部西部的早古生代构造演化，它限制了兴萌造山带的两个主要的早古生代构造事件：（a）埃尔古纳之间的晚寒武纪碰撞-Kerulen区块和Arigin Sum-Xilinhot-Xing'an区块; （b）古亚洲洋的早古生代俯冲作用和额尔古纳-兴安区块与松辽-浑善达克区块之间的泥盆纪晚期碰撞。

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  • 来源
    《Journal of Asian earth sciences》 |2014年第1期|136-146|共11页
  • 作者

    Pan Zhao; Junqin Fang; Bei Xu; Yan Chen; Michel Faure;

  • 作者单位

    Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education, Peking University, Beijing 100871, China,Universited'Orleans, ISTO, UMR 7327, 45071 Orleans, France;

    Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education, Peking University, Beijing 100871, China;

    Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education, Peking University, Beijing 100871, China;

    Universited'Orleans, ISTO, UMR 7327, 45071 Orleans, France,CNRS/INSU, ISTO, UMR 7327, 45071 Orleans, France,BRGM, ISTO, UMR 7327, BP 36009, 45060 Orleans, France;

    Universited'Orleans, ISTO, UMR 7327, 45071 Orleans, France,CNRS/INSU, ISTO, UMR 7327, 45071 Orleans, France,BRGM, ISTO, UMR 7327, BP 36009, 45060 Orleans, France;

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  • 正文语种 eng
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  • 关键词

    Xing-Meng Orogenic Belt; Early Paleozoic; Detrital zircon; Erguna-Xing'an Block; Inner Mongolia;

    机译：兴孟造山带;早古生代;碎屑锆石;额尔古纳-兴安街区;内蒙古;

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