【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。更多还原

【Abstract】 The area of Huangshan-Jing’erquan in eastern Tianshan distributes numerous mafic-ultramafic instrusions which are emplaced in groups and in zones and controlled by regional ductile shearing zone and fault structure.To further determine the Huangshan-Jing’erquan mafic-ultramafic belt emplacement age,genesis and geotectonic setting,this paper selected from the Huangshan-Jing’erquan phase of gabbro lithofacies 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-Jing’erquan 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.更多还原