摘要
南天山铜花山蛇绿构造混杂岩带中发育有斜长花岗岩产于蛇绿岩的顶部,并且二者呈断层接触关系。本文采用锆石LA-ICP-MS微区微量元素分析和U-Pb定年,获得斜长花岗岩年龄为(406.5±5.0)Ma,侵位时代确定为早泥盆世,这一年龄代表了铜花山蛇绿岩形成的下限年龄。
In Southern Tianshan Mountains of the Tonghuashan ophiolitic tectonic belt,the plagiogranite is exposed at the top of ultrabasic rocks,showing fault contact relationship.The concordant age of(406.5±5.0)Ma was obtained for the plagiogranite by the zircon micro-domain LA-ICP-MS rare earth elements analysis and U-Pb age dating,indicating that the intrusive epoch of plagiogranite was Early Devonian,and that this age represents the lower limit age of the Tonghuashan ophiolitic formation.
出处
《中国地质》
CAS
CSCD
北大核心
2011年第1期94-102,共9页
Geology in China
基金
新疆托克逊县库米什镇一带1:5万区域地质矿产调查项目(XJQDZ2007-09)资助