【摘要】 木纳布拉克构造混杂岩带位于南阿尔金与东昆仑衔接部位,是古阿尔金洋岩石圈板块由南向北阶段性俯冲的产物,为南阿尔金蛇绿岩带的重要组成部分。通过1∶10 000大比例尺填图和剖面测量,结合显微尺度的构造解析,对该构造混杂岩带的物质组成和变形特征进行研究,将与构造混杂岩带有关的物质组成划分为弱变形的"岩块"与强变形的"基质"两类,并从中识别出9种不同岩石组合的岩块及2种不同类型的基质。在对"岩块"和"基质"构造几何学和运动学特征研究的基础上,重点分析了地质体的构造变形截切关系及组合特征,在构造混杂岩带中识别出6期变形作用,建立了相对构造变形序列,为木纳布拉克构造混杂岩带演化提供了新的构造证据。更多还原

【Abstract】 The Munabulake tectonic mélange is located between the South Altyn Tagh and East Kunlun. The mélange was formed during the north-dipping subduction of the Altyn Ocean,and is an important part of the South Altyn Tagh ophiolite belt. With 1∶ 10 k mapping and cross-section measuring,we reveal the compositions and deformation features of the mélange,and divide the compositions into two types,i. e. strongly-deformed matrix and weakly-deformed blocks. Under the microscope,microstructural observation has further identified ninetypes of blocks and two types of matrix. Based on the geometry and kinematics of the matrix and blocks,the crosscutting relationship and tectonic association of the various geological bodies have been analyzed. As a result,six deformation phases have been recognized and the deformation history of the tectonic mélange has been established,which provides new insights for the tectonic evolution of South Altyn Tagh.更多还原