萨热克砂砾岩型铜矿成矿物质来源与隐伏基底顶面形态控矿特征  

Ore-Forming Material Source for Sareke Glutenite Type Copper Deposit and Ore-Controll Characteristics of Top Surface of Concealed Basement

作　　者：李天成[1] 方维萱[1] 王磊[1] 郭玉乾[1] 韩文华[1] LI Tian-cheng;FANG Wei-xuan;WANG Lei;GUO Yu-qian;HAN Wen-hua(China Non-ferrous Metals Resource Geological Survey Center, Beijing 100012, China)

机构地区：[1]有色金属矿产地质调查中心,北京100012

出　　处：《矿物学报》2017年第5期536-544,共9页Acta Mineralogica Sinica

基　　金：国土资源部公益性行业科研专项基金(201511016-1)

摘　　要：塔西地区萨热克砂砾岩型铜多金属矿床位于塔拉斯-费尔干纳北西向右旋走滑断裂带、萨瓦亚尔顿-吉根左旋走滑逆冲断裂带、帕米尔冲断褶皱前锋带构成的三角区的中心部位,苏鲁铁热克断隆区北侧的中生代巴依次级拉分断陷盆地中。围绕苏鲁铁热克隆起带分布大量的中新生代砂砾岩型铜铅锌矿床,显示该隆起带对砂砾岩型铜铅锌矿床具有重要的控制作用。萨热克铜矿区主要地层岩矿石的微量元素和稀土元素地球化学特征,显示成矿物质来源主要来自于基底隆起区的剥蚀物,为陆相沉积环境。含矿地层库孜贡苏组杂砾岩中稀土元素整体亏损,显示存在强还原性盆地流体作用,矿床在还原性盆地流体作用下改造叠加富集。音频大地电磁测深反演恢复盆地基底形态特征,揭示富矿体与基底北西向隆起及其两侧的次级洼陷之间的构造坡折带具有密切空间关系,其构造岩相特征控制的同生构造带和层间裂隙带,有利于还原性盆地流体的运移聚集,它们可能是地球化学岩相学圈闭界面并导致沉淀金属元素,为深部找矿预测的构造岩相标志。Sareke glutenite type copper deposit in the Western Tarim Basin is located in the triangle area of Taras-Fergana north-west dextral strike-slip fault zone, Sawayalton-Jigen sinistral strike-slip thrust fault zone, and the front faces zone of Pamir thrust fault. A large number of Mesozonic-Genozoic glutenite type copper-lead-zinc deposit are distributed around Sulutielieke rising belt, showing the rise belt plays an important role in controlling glutenite type copper-lead-zinc deposit. Geochemical characteristics of trace elements and rare-earth elements in the main stratum of Sareke mine show that the source of ore-forming material is mainly from the denudation of the basement uplift and is the continental depositional environment. The ore-hosting stata Kuzigongsu group conglomerate REE overall loss, show the presence of strong reduction of basin fluid and the deposit in reduction of basin fluid under transformation superimposed enrichment. Audio magnetotelluric inversion recovery basement morphology characteristics show that bonanza and the slope zone between the northwest direction concealed basement rise and secondary deprsssions of both sides of the rise has a close spatial relationship. The tectonic lithofaces control with syngenetic tetonic belt and interlayer fracture with conductive to reducing migration of basin fluid accumulation and precipitation of metal elements in favorable facies zone and geochemical interface traps, mark of tectonic lithofacies for the deep ore-body prospecting prediction.

关 键 词：苏鲁铁热克隆起 拉分盆地 逆冲冲断带 微量元素 基底构造 

分 类 号：P611[天文地球—矿床学] P612[天文地球—地质学]