西昆仑山东段库牙克断裂与康西瓦断裂、阿尔金断裂关系的地球化学证据

Geochemical evidence of the relation between the Kuyake fault of eastpart of west Kunlum Mountains and the Kangxiwar and Altyn Tagh faults

新疆昆仑山中部库牙克地区,处于不同大地构造单元的结合部位,一些重要构造线均交会于此,确定它们之间的关系,关键在于库牙克断裂。1∶20万区域化探最新成果显示,库牙克地区绝大多数元素两分性特征突出、南北差异明显,北部整体富集MgO、K2O、Na2O、Al2O3、CaO、Cr、Ni、Co、V、Ti、Au、La、Be,而贫Hg、As、Sb、B、Li,南部正好相反。两者之间的分界线从东向西依次对应于阿尔金断裂西段、库牙克断裂、阿什库勒断裂和康西瓦断裂东端。因此,从地球化学角度对库牙克断裂的延伸进行了推断,提出库牙克断裂东连阿尔金、西经阿什库勒与康西瓦断裂相接的新认识。

The Kuyake area in the central Kunlun Mountains is located in the junction of different tectonic units, where some important tectonic lines also intersect. The key to the determination of their relations lies in the Kuyake fault. The latest result of 1∶200000 regional geochemical survey has shown that in the Kuyake area most elements have prominent dichotomy and show marked difference between the north and the south: the north is enriched in MgO, K2O, Na2O, Al2O3, CaO, Cr, Ni, Co, V, Ti, Au, La and Be but depleted in Hg, As, Sb, B and Li, but the reverse is true in the south. From east to west, the boundary between the north and the south corresponds successively to the west segment of the Altyn Tagh fault, Kuyake fault, Ashikule fault and the east end of the Kangxiwar fault. From a geochemical inference of the extension of the Kuyake fault, the authors put forward a new idea that the Kuyake fault is connected with the Altyn Tagh fault in the east and with the Kangxiwar fault through Ashikule in the west.