| 库车盆地铜矿化与盐丘系统的关系 |
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| 引用本文：宣之强,陈永志.2010.Relationship between surface copper mineralization and salt dome system in Kuqa basin[J].Mineral Deposits,29(3):553~562 |
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| 基金项目:中国地质科学院矿产资源研究所中央级公益性科研院所基本科研业务项目（编号 K0807）；国家“十一五”科技支撑课题（塔里木盆地钾盐大规模成矿条件研究与找矿靶区预测技术，编号2006BAB07B06） |
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| 中文摘要:库车盆地新近系发育一系列盐丘体，遥感解译和野外地貌调查共发现36个盐丘体，主要分布在南部的秋里塔格构造带和北部的克拉苏构造带，沿近东西向断裂呈带状分布。在盐丘体的发育过程中，盐丘体、围岩及围岩中发育的断裂与破碎带等构成一个盐丘体系统。调查显示铜矿化发育在盐丘体附近，位于盆地南、北两大构造带（背斜带）轴部偏两翼处，共有砂岩型、泥岩型、灰岩型3种类型，主要矿物为氯铜矿，矿化层位于上新统的康村组和中新统的吉迪克组。扫描电镜分析发现，盐丘体中盐岩样品含有自然铜、氯铜矿，表明盐丘体可以为地表铜矿化提供铜源，而卤水中的盐分来自盐丘体中盐、膏的溶解。盐丘系统不但为地表铜矿化提供铜源，而且其卤水对铜的富集、运移起到载体作用。存在于盐丘系统围岩并与后期盐丘体相伴生的断裂、节理、破碎带，为含铜卤水的迁移提供通道，盐丘体后期的构造挤压力，成为含铜卤水的运移动力。因此，盐丘系统发育过程对碎屑岩型铜矿形成起到关键性控制作用。 |
| 中文关键词:地质学 库车盆地 盐丘体系统 卤水 地表铜矿化 |
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| Relationship between surface copper mineralization and salt dome system in Kuqa basin |
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| Abstract:A series of Neogene salt domes are developed in Kuqa basin. Up till now, 36 salt domes have been found by remote sensing and field morphologic investigation, w hich are mainly scattered in Qiulitage tectonic belt in the south and Kelasu tec tonic belt in the north, exhibiting EW-trending faulted zonal distribution. During the development of the salt domes, salt domes and wall rocks as well as fault structures and shatter zones developed in wall rocks constitute a salt dome sys tem. Surface copper mineralization is developed near the salt dome, lies at the axial parts of the two large tectonic belts (anticlinal belts), somewhat close t o the two limbs, and consists of four types, i.e., sandstone type, mudstone type , limestone type and sulfide-bearing quartz vein type. The main mineral in the f irst three types is atacamite, and the mineralized horizons are located in Plioc ene Kangcun Formation and Miocene Jidike Formation. Scanning electron microscopi c analysis reveals that salt rock samples from the salt dome contain native copp er and atacamite, suggesting that the salt dome could provide copper for surface copper mineralization, whereas the salt in the brine was derived from the solut ion of salt and gypsum in the salt dome. The salt dome system not only provided brine and copper source for surface copper mineralization but also served as car rier for copper enrichment and migration through the brine formed by solution. T he faults, joints and shatter zones that existed in the wall rocks of the salt b ody and were associated with later salt domes provided channels for the migratio n of copper-bearing brine. The late stage structural compression acted as the dr iving force for the migration of copper-bearing brine. |
| keywords:geology, Kuqa basin, salt dome system, brine, surfac e copper mine ralization |
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