地质通报2018，Vol.37Issue(5)：790-804,15.
新疆东天山哈尔里克山石炭纪花岗岩锆石U-Pb年龄、成因演化及地质意义
Zircon U-Pb ages, genetic evolution and geological significance of Carboniferous granites in the Harlik Mountain, East Tianshan, Xinjiang
摘要
Abstract
Extensively developed granitoids in northern Xinjiang have constituted one of the hotspots in the study of granite in the western Central Asian Orogenic Belt.LA-ICP-MS zircon U-Pb analysis of the Xiaopu biotite monzogranite and Qinchengnan hornblende monzogranite in the Harlic area yielded crystallization ages of 316 ± 4Ma and 320 ± 3Ma.Their petrological and geochemical characteristics show that Xiaopu pluton belongs to high-K calc-alkaline and weakly peraluminous series of Ⅰ-type granite,whereas the Qinchengnan pluton belongs to high-K calc-alkaline and metaluminous series with A-type granite characteristics.The Xiaopu pluton has positive zircon ε Hf(t) values of +8.0 ～ +13.8,and the Qinchengnan pluton has higher ε Hf(t) values up to + 10.8～+ 16.7,with corresponding Hf model ages(TDMc) of 822 ～ 450Ma and 641 ～268Ma,respectively.These isotopic compositions indicate that young crust served as the main source of the granite generation.Combined with coeval basic rocks with similar isotopic compositions in this region,it can be believed that these young granites might have been related to the new mantle-derived basic magma underplating and exhibited the post-collision vertical growth.Additionally,the Qinchengnan granites have A-type granite characteristics,thus providing a further evidence for the transition period of Late Carboniferous from collision to post-collision settings.关键词
花岗岩/地壳生长/锆石U-Pb年龄/东天山/石炭纪Key words
granites/crustal growth/zircon U-Pb ages/East Tianshan/Carboniferous分类
天文与地球科学引用本文复制引用
宋鹏,童英,王涛,黄河,张建军,黄伟..新疆东天山哈尔里克山石炭纪花岗岩锆石U-Pb年龄、成因演化及地质意义[J].地质通报,2018,37(5):790-804,15.基金项目
国家自然科学基金-新疆联合基金重点支持项目《北疆及邻区深部新老地壳时空分布构架及其成矿制约》(编号:U1403291)和中国地质调查局项目《显生宙重大岩浆事件调查与岩浆岩试点填图》(编号:DD20160123)、《中国岩浆岩综合研究》(编号:DD20160345) （编号:U1403291）
