哈尔里克山口门子地区石英闪长岩锆石SHRIMP U-Pb测年及其地质意义

Zircon SHRIMP U-Pb dating of quartz diorite in the Koumenzi area, Karlik Mountains, East Tianshan, Xinjiang, China, and its geological significance

哈尔里克山口门子一带原划石炭纪石英闪长岩的锆石SHRIMPU-Pb年龄为429.6Ma±6.2Ma,其围岩原被置于下中泥盆统,根据1∶5万区域地质调查和前人的资料,将其重新厘定为奥陶系。结合区域上该构造单元近年内获得的新成果,提出准噶尔南缘地区加里东构造岩浆带已越过卡拉麦里-麦钦乌拉断裂、广泛发育于哈尔里克-大南湖华力西岛弧带上的认识。

Quartz diorite in the Koumenzi area, Karlik Mountains, which was originally assigned to the Carboniferous, has a zircon SHRIMP U-Pb age of 429.6±6.2 Ma and its country rocks were originally assigned to the Middle Devonian. According to 1：50000 regional geological survey and previous data, the age is redefined as Ordovician. Based on the results of recent research on this tectonic unit, the authors propose the view that the Caledonian tectonomagmatic belt on the southern margin of the Junggar basin has crossed the Kalamaili-Maiqinwula fault and is widely developed in the Karlik-Dananhu Variscan island arc zone.