有关内蒙古西拉木伦带古生代-早中生代构造环境的讨论
发布时间：2018-07-14 13:21
【摘要】：针对近年来对华北板块与南蒙微大陆碰撞时限与演化历史的争论,本文通过内蒙古西拉木伦河两侧双井-杏树洼一带不同时期地质体的解析,反演了与古生代-中生代构造演化有关的三段历史:(1)由杏树洼组和所裹挟的蛇绿岩块组成的小苇塘岩片记录了早古生代末弧前盆地演化的历史;(2)由早二叠世末期侵位的中-基性岩墙和中二叠世的克德河砂砾岩充填的断陷盆地显示了板块碰撞造山后年轻陆壳经受的伸展作用;(3)中二叠世和中三叠世伸展背景下的岩浆活动,根据兴蒙造山带乃至中亚造山带岩浆活动的研究,结合前人对双井地区的研究成果,认为控制这一岩浆活动的是幔源岩浆上涌的底侵作用,而不是"同碰撞"的挤压-汇聚环境,因此花岗岩的形成不能作为板块碰撞时间的约束。
[Abstract]:In view of the controversy over the time limit and evolution history of the collision between the North China plate and the Southern Mongolian microcontinent in recent years, the geological bodies in the area of Shuangjing-Xingshuwa on the two sides of the West Lamulen River in Inner Mongolia have been analyzed in different periods. Three sections of history related to the Paleozoic to Mesozoic tectonic evolution have been inversed: (1) the evolution of the early Paleozoic late Paleozoic forearc basin was recorded by the Xiaoweitang lithocline composed of Xingshuwa formation and ophiolite blocks; (2) the evolution of the late early Permian era was recorded from the end of the early Permian. The emplacement of the Meso-basic rock wall and the Middle Permian Kede River sand conglomerate filled fault depression basin show the extension of the young continental crust after the plate collision orogeny. (3) magmatic activity in the context of the Middle Permian and the Middle Triassic extensions. According to the study of magmatic activity in Xingmeng orogenic belt and Central Asia orogenic belt, combined with the previous research results in Shuangjing area, it is considered that the mantle magmatic upwelling is controlled by the underthrust of mantle magma upwelling. The formation of granite can not be used as a constraint of plate collision time.
【作者单位】： 造山带与地壳演化教育部重点实验室 北京大学地球与空间科学学院;内蒙古第十地质矿产勘查开发院;沈阳地质矿产研究所;
【基金】：中国地质调查项目(121201102000150009)资助
【分类号】：P542
[Abstract]:In view of the controversy over the time limit and evolution history of the collision between the North China plate and the Southern Mongolian microcontinent in recent years, the geological bodies in the area of Shuangjing-Xingshuwa on the two sides of the West Lamulen River in Inner Mongolia have been analyzed in different periods. Three sections of history related to the Paleozoic to Mesozoic tectonic evolution have been inversed: (1) the evolution of the early Paleozoic late Paleozoic forearc basin was recorded by the Xiaoweitang lithocline composed of Xingshuwa formation and ophiolite blocks; (2) the evolution of the late early Permian era was recorded from the end of the early Permian. The emplacement of the Meso-basic rock wall and the Middle Permian Kede River sand conglomerate filled fault depression basin show the extension of the young continental crust after the plate collision orogeny. (3) magmatic activity in the context of the Middle Permian and the Middle Triassic extensions. According to the study of magmatic activity in Xingmeng orogenic belt and Central Asia orogenic belt, combined with the previous research results in Shuangjing area, it is considered that the mantle magmatic upwelling is controlled by the underthrust of mantle magma upwelling. The formation of granite can not be used as a constraint of plate collision time.
【作者单位】： 造山带与地壳演化教育部重点实验室 北京大学地球与空间科学学院;内蒙古第十地质矿产勘查开发院;沈阳地质矿产研究所;
【基金】：中国地质调查项目(121201102000150009)资助
【分类号】：P542
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