东天山黄山岩体的侵位时代及其地质意义  

Geochronology and Its Geological Significance of the Huangshan Intrusion in Eastern Tianshan,Xinjiang

作　　者：张小连[1] 吴昌志[2,3] 黄建华[4] 顾连兴[2,3] 张遵忠 雷如雄[2,3] 

机构地区：[1]河南省煤田地质局三队,河南新乡453003 [2]南京大学内生金属矿床成矿机制国家重点实验室,南京210093 [3]南京大学地球科学系,南京210093 [4]新疆大学地质勘查与工程学院,乌鲁木齐830046 [5]有色金属华东地质勘查局,南京210007

出　　处：《地质科技情报》2012年第1期22-26,共5页Geological Science and Technology Information

摘　　要：东天山黄山-镜儿泉地区分布有众多镁铁质-超镁铁质岩体,岩体成群成带分布,受区域性韧性剪切带和断裂构造控制。为进一步确定黄山-镜儿泉基性-超基性岩带的侵位时代、成因和大地构造背景,对选自黄山岩体辉长岩相中单颗粒锆石进行了LA-ICP-MS U-Pb定年研究,将其结果[(284.5±2.5)Ma]与黄山岩体和黄山-镜儿泉一带其他基性-超基性岩中已有的定年成果进行了对比,并结合近年来该区研究成果,分析得到黄山辉长岩侵位于晚石炭世-早二叠世,此时正值东天山后碰撞大规模岩浆侵位和成矿时期。黄山镁铁质-超镁铁质岩带形成于后碰撞的伸展构造环境。The area of Huangshan-Jing＇erquan in eastern Tianshan distributes numerous mafic-ultramafic in- strusions which are emplaced in groups and in zones and controlled by regional ductile shearing zone and fault structure. To further determine the Huangshan-Jingrerquan mafic-ultramafic belt emplacement age, genesis and geotectonic setting, this paper selected from the Huangshan-Jingrerquan phase of gabbro litho- facies single-grain zircon LA-ICP-MS U-Pb dating . This paper contrasted the result [-（284.5±2.5） Ma] with the existing dating work of Huangshan rock mass and Huangshan-Jingrerquan other mafic-ultramafic rock, and combined with the area in recent research. It is concluded that Huangshan gabbro is emplaced in the Late Carboniferous-Early Permian[（284.5±2.5）Ma], which is eastern Tianshan rear collision massive magma emplacement and mineralization period. Huangshan mafic-ultramafic instrusions are formed in the surroundings of post-collision extensional structure.

关 键 词：辉长岩 基性-超基性 LA-ICP-MS锆石年代学 东天山 

分 类 号：P58[天文地球—岩石学]