哈尔里克山早古生代岩浆弧的初步确定——来自塔水河一带花岗质岩体锆石SHRIMP U-Pb测年的证据  

Preliminary determination of the Early Paleozoic magmatic arc in the Karlik Mountains, East Tianshan, Xinjiang, China-Evidence from zircon SHRIMP U-Pb dating of granite bodies in the Tashuihe area

作　　者：曹福根 涂其军[2] 张晓梅 任燕 李嵩龄 董富荣 

机构地区：[1]新疆地勘局第一区域地质调查大队,新疆乌鲁木齐830011 [2]长安大学地球科学与国土资源学院,陕西西安710054

出　　处：《地质通报》2006年第8期923-927,共5页Geological Bulletin of China

基　　金：新疆维吾尔自治区项目<1:5万琼库尔幅;代普台日幅;塔水河幅3幅联测>(编号:XJQD2003-08)部分成果。

摘　　要：哈尔里克山南坡塔水河一带花岗质岩体的锆石SHRIMPU-Pb定年结果显示:钾长花岗岩中的锆石8个测点的206Pb/238U加权平均年龄为(462±9)Ma;花岗闪长岩中的锆石8个测点的206Pb/238U加权平均年龄为(447±11)Ma;石英闪长岩中的锆石8个测点的206Pb/238U加权平均年龄为(448±7)Ma。这些年龄值是在哈尔里克古生代复合岛弧带首次获得的中—晚奥陶世中酸性侵入岩的时代,为探讨该古生代复合岛弧带的构造发展历史提供了新的资料。SHRIMP dating of zircons from granitic bodies in the Tashuihe area on the southern slope of the Karlik Mountains shows that 8 spots of zircons from moyite, 8 spots of zircons from granodiorite and 8 spots of zircons from quartz diorite give weighted mean ^206Pb/^238U ages of 462±9, 447±±11 and 448±7 Ma respectively. These ages are ages of Mid-Late Ordovician intermediate-acid intrusive rocks obtained for the first time from the Paleozoic Karlik composite island arc zone, which furnish new data for the study of the tectonic history of this Paleozoic composite island arc zone.

关 键 词：东天山 哈尔里克山 塔水河 花岗岩 锆石SHRIMP U—Pb定年 

分 类 号：P588.1[天文地球—岩石学] P597.3[天文地球—地质学]