吐哈盆地南缘克孜尔塔格复式岩体中花岗闪长岩锆石SHRIMP U-Pb测年及岩体侵位时代讨论  

Zircon SHRIMP U-Pb dating of granodiorite in the Kizil Tag composite intrusion,south margin of the Tulufan-Hami basin, East Tianshan, Xinjiang, China: With a discussion of the age of emplacement of the intrusion

作　　者：李少贞 任燕 冯新昌 李嵩龄 

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

出　　处：《地质通报》2006年第8期937-940,共4页Geological Bulletin of China

基　　金：1:25万(K46C002002)区域地质调查项目(No.200113000060)部分成果。

摘　　要：克孜尔塔格岩体侵入最新地层为下石炭统干墩岩组。该岩体中剪切变形的花岗闪长岩锆石SHRIMPU-Pb定年为271.6Ma±1.6Ma,此年龄值介于王瑜等所研究剪切作用的年龄276～254Ma之间,岩体侵位时代应略早于变形时代,为晚石炭世末至早二叠世早期,271.6Ma为岩体结晶年龄,时代为早二叠世晚期。The youngest strata intruded by the Kizil Tag intrusion are the Lower Carboniferous Gandun Formation. The granodiorite that has undergone shear deformation in the intrusion has a zircon SHRIMP U-Pb age of 271.6±1.6 Ma, which lies between the shear ages of 276 and 254 Ma proposed by Wang Yu et al. The emplacement age of the intrusion should be slightly earlier than the deformation age, being from the terminal Late Carboniferous to early Early Permian. 271.6 Ma is the crystallization age of the intrusion, indicating a late Early Permian age.

关 键 词：东天山 克孜尔塔格岩体 同位素年龄 

分 类 号：P588.122[天文地球—岩石学] P597.3[天文地球—地质学]