新疆艾母土巴斯它乌蛇绿岩地质特征

艾母土巴斯它乌蛇绿岩为区域上阿拉尔—巴音沟—古尔图蛇绿岩带的西延部分,是华力西中期准噶尔微板块与伊犁—伊赛克湖微板块俯冲带的重要组成部分,为该处存在微板块缝合带提供了依据。带内发育早石炭世洋盆火山—沉积岩系、蛇绿岩。地球化学特征显示蛇绿岩于早石炭世晚期形成于微洋盆扩张环境。

GEOLOGICAL CHARACTERISTICS OF OPHIOLITE IN AIMUTUBASITAWU AREA OF XINJIANG

Regionally, The ophiolite in Aimutubasitawu is at the west prolongation part of the Ahai-Bayingou-Guertu ophiolite belt, and it is the important part of subduction zone of Zhungeer tiny plate and Yili-Yisaikehu tiny plate in middle Variscan epoch. It is parted in the Shadawang Formation of early Carboniferous which contact with Qi＇ergusitao Formation of late Carboniferous by fault, and suffered serious structural dismantling. Through studying the data on the geological and geochemical features of ophiolite, formation time inferred from fossil and measured by zircon U-Pb dating, it is supposed that the ophiolite formed at the end of early Carboniferous, the relatively integrated rock assemblage of ophiolite suffered structural dismantling indicate the environment of ocean bain with limited expansion.