金川地区构造序列及与铜镍硫化物矿床的关系  

Structural sequence and its relationship with Cu-Ni sulfide ore deposit in the Jinchuan Area,Gansu,China

作　　者：曾南石[1] 汪劲草[1] 罗先熔[1] 张建辉 

机构地区：[1]桂林理工大学地球科学学院广西隐伏金属矿产勘查重点实验室,广西桂林541004 [2]金川集团有限公司,甘肃金昌737120

出　　处：《地学前缘》2013年第6期210-218,共9页Earth Science Frontiers

基　　金：国家科技支撑项目(2008BAB32B10-01B);国家自然科学基金项目(41172089);广西隐伏金属矿产勘查重点实验室基金项目(11-031-20-1)

摘　　要：金川地区的控矿构造有其特色,一个存在于白家嘴子组和塔马子沟组间的早期推覆构造造成位于断层上盘的白家嘴子组地层强烈变形,并与后期伴随大陆裂解的伸展构造一同为含矿超基性岩浆的贯入成矿创造了条件。在中新元古代,金川地区可能发育成一个变质核杂岩体,伴随有大规模基性-超基性岩浆侵入。祁连造山运动为区域成矿后的最主要构造运动。在造山过程,形成一系列近北西西向逆-平移断层,并将龙首山的老变质核杂岩夹持隆起,在区域上显现出一个正花状构造系,构建了该区域的主要构造格架。祁连运动还导致原似层状的含矿岩体破裂、走滑和翘起,导致青藏高原隆起的新构造运动则将白家嘴子含矿岩体进一步破坏,同时将其向北东东推掩至新生代冲积层之上。The ore-controlling structures in the Jinchuan Area have their own characteristics.A deeper nappe fault of the Luliang stage,occurring between the Bajiazuizi and Tamazigou groups,made the hanging strata of Baijiazuzi group to be intensively deformed,which associated with the later extensional tectonics,having created the condition for the penetrating of ore-bearing magma.The Jinchuan Area had been developed into a typical metamorphic core complex and accompanied with large-scale mafic-ultramafic magma intrusion during the Middle and Late Proterozoic.Qilian-orogeny was the major tectonic movement after the forming of the Jinchuan ore deposit.During the orogenic process,a series of thrust and strike-slip faults trending NWW made the Longshoushan metamorphic core complex to be gripped and bulged upward by the collision.It composed a palm tree structure that built up the major regional tectonic framework of this area.The Qilian-orogeny had also led to the rupturing,strike-slip and tilting of the original stratiform ore-bearing magmatic intrusions.Due to the uplift of the Tibetan Plateau,the new tectonic movement further pushed the ore-bearing magmatic intrusions NEE-wards onto the Cenozoic alluvium.

关 键 词：金川铜镍硫化物矿床 构造序列 推覆构造 变质核杂岩 正花状构造 

分 类 号：P613[天文地球—矿床学]