新疆于田普鲁—阿羌石炭纪裂谷地质特征及成矿意义

GEOLOGICAL FEATURES AND ORE-FORMING SIGNIFICANCE OF THE CARBONIFEROUS RIFT IN PULU-AQIANG OF YUTIAN COUNT, SINJIANG

新疆于田普鲁—阿羌石炭纪裂谷 ,发育于塔里木板块晚古生代被动陆缘之上。裂谷发展经历了两个阶段 ,即早石炭世裂谷形成发展阶段和晚石炭世—早二叠世裂谷敛合阶段 ,形成发展阶段主要为双峰式火山岩建造 ,敛合期以钙碱性安山岩、基性玄武岩为主间夹灰岩、砂砾岩等。该裂谷为塔里木南缘晚古生代活动带的一部分。活动带内大量火山岩浆活动为以铜为主的多金属成矿提供良好条件 ,同时深大断裂活动使金刚石成矿成为可能。对该活动带的深入研究不仅对古特提斯演化研究具有重要意义 ,而且对指导找矿具有非常重要的现实意义。

The Carboniferous rift of Pulu Aqiang in Yutian County of Xinjiang developed over a passive continental margin of the Tarim plate in the Late Paleozoic period. The rift had experienced two phases of evolution, i.e. the formation and development stage of the early Carboniferous rift and the convergent stage of the rift in the late Carboniferous and the early Permian periods. In the period of development stage bimodal volcanic formation were dominant and in the period of convergent stage calc alkaline andesite and basic basalt containing limestone and sandstone. The rift is a part of the late Paleozoic active belt in the margin of Tarim. A lot of volcano magma moving in the active belt resulted in considerable conditions for polymetallic formation, in which copper is dominant, and the motivation of the deep major faults made it possible for diamond occurrence. Further researches of the active belt has not only had important significance for studying of the old Tethyan evolution, but also had a practical support for ore prospecting.