新疆塔什库尔干吉尔铁克铁矿地质特征及成因  

Geological characteristics and genesis of Jiertieke iron deposit in Taxkorgan Area, Xinjiang Province

作　　者：杨国林[1] 何雨栗[1] 王文佳[1] 董俊玲[1] 王浩飞[1] 孙柏年[1] 

机构地区：[1]兰州大学地质科学与矿产资源学院,兰州730000

出　　处：《兰州大学学报（自然科学版）》2015年第4期462-469,477,共9页Journal of Lanzhou University(Natural Sciences)

基　　金：国家重点基础研究发展计划(973计划)项目(2012CB822003);高等学校博士学科点专项科研基金(20120211110022)

摘　　要：新疆吉尔铁克铁矿位于西昆仑塔什库尔干铁铜钒成矿区的塔阿西-塔吐鲁沟铁成矿带,研究该矿的地质特征及成因将对深入分析西昆仑乃至新疆重要的早元古代沉积变质型铁矿具有重要意义.通过矿区地质填图、地质剖面测量、地球化学分析等工作,查明区内矿体赋存于下元古界布伦阔勒群内,以似层状磁铁矿体为主,矿石结构以自形-半自形为主,矿石构造以块状构造、条带状构造和浸染状构造为主,含矿岩性为阳起石英磁铁岩、磁铁阳起黑云片岩和磁铁大理岩,赋矿围岩为石英黑云片岩、蚀变黑云片岩、石英岩和蓝闪黑云片岩.分析了吉尔铁克铁矿的原岩类型和矿床成因.结果表明:矿区布伦阔勒群原岩为一套火山沉积岩或中、基性火山岩,矿床类型为海相火山沉积变质型,成矿物质来源于海底火山活动.成矿经历了3个时期:加里东晚期到三叠纪为矿体埋深变质阶段,三叠纪晚期的西昆仑构造带俯冲挤压和康西瓦、塔阿西断裂带共同作用为成矿提供了构造条件,燕山期中酸性的岩浆侵入起到了叠加改造矿体的作用.The Jiertieke iron deposit of Xinjiang is located in the Ta＇axi-Tatulugou iron metallogenic belt of the Taxkorgan iron-copper-vanadium metallogenic region in the West Kunlun Mountains. The study of geologic features and deposit genesis is of great significance for the analysis of the early Proterozoic sedimentary-metamorphic iron deposit in the West Kunlun and even in Xinjiang. Geological mapping, geologic section measuring, geochemistry analysis, etc. found the ore bodies to in the lower Proterozoic Bulunkuole Group and mainly in the form of strata. The ore~ have euhedral-subhedral textures, and the ore structures are mainly massive, banded, and of dissemination structures. The main ore-bearing rock types include actinolite quartzite magnetite, magnet actinolite biotite schist and banded magnetic marble. Wall rocks contain quartz biotitic schist, altered biotitic schist, quartzite and glaucophane biotitic schist. We analyzed in detail the original rock types and the genesis of the Jiertieke iron deposit, and the results showed that the original composition of the Bulunkuole Group is a set of volcanic sedimentary rocks or intermediate basic volcanic rocks. The genesis type of the ore deposit is the marine volcanic sedimentary metamorphic iron deposit. The seafloor volcanic activity provided the main ore-forming materials. The deposit experienced three mineralizing stages. The late Caledonian to the Triassic period was the burial metamorphic stage. The West Kunlun tectonic belt subduction, the Kangxiwa and Ta＇axi faults formed in the late Triassic, providing favorable tectonic conditions for iron mineralization. The Yanshanian intermediate-acid intrusive rocks transformed the ore bodies.

关 键 词：吉尔铁克铁矿 地质特征 原岩恢复 矿床成因 新疆 

分 类 号：P618.31[天文地球—矿床学]