青海它温查汉铁多金属矿床地质特征及找矿方向探讨  

Geological characteristics and prospecting direction of Tawenchahan iron polymetallic deposit in Qinghai

作　　者：王国鹏 吴德成 祁连忠 裴玉婷 WANG Guopeng;WU Decheng;QI Lianzhong;PEI Yuting(West Mining Group Co.,Ltd.,Xining 810001,Qinghai,China)

机构地区：[1]西部矿业集团有限公司,青海西宁810001

出　　处：《矿产与地质》2025年第1期71-79,共9页Mineral Resources and Geology

基　　金：国家科技重大专项(2017ZX05039-001)资助。

摘　　要：它温查汉矿床位于东昆仑祁漫塔格早古生代岩浆弧带,属野马泉—开木棋河华力西—印支期铁多金属成矿亚带。矿区分布地层主要是下古生界奥陶系—志留系滩间山群碳酸盐岩组大理岩夹结晶灰岩段,地层内发育的矽卡岩带是本区铁多金属矿主要赋矿层位。矿区构造基本为一向NNE倾斜的单斜构造,由于地表覆盖严重,断裂构造形迹不清。矿区广泛分布酸性花岗岩类,侵入岩时代属于晚三叠世。研究结果表明,本区中酸性侵入岩石整体上属结晶分异程度较高的钙碱性系列,岩性主要为花岗岩类,为岛弧花岗岩,成因类型分别属于I型和A型。本区为隐伏埋藏矿床,矿区共圈定矿体145个,主矿体Fe1呈条带状产出,矿体长度约1000 m,倾向北,倾角40°~60°,平均厚度15.24 m,平均品位mFe30.88%。矿石的矿物组成较为简单,金属矿物主要为磁铁矿,另见有黄铜矿、闪锌矿、磁黄铁矿等。矿石主要有用组分为Fe,可综合利用的共伴生有益组分有Au、Cu、Zn、Mo。本矿床的成因类型为接触交代(矽卡岩)—热液型铁多金属矿床。根据分析,认为矿区尚有较大的增储潜力。Tawenchahan deposit is located in the Qimantag Early Paleozoic magmatic arc belt of East Kunlun,belonging to the Yemaquan-Kaimuqihe Hualixi-Indochinese iron polymetallic metallogenic subbelt.The distribution strata of the mining area are mainly the early Paleozoic Ordovician and Silurian Tanjianshan Group,carbonate rocks with marble and crystalline limestone segments.The skarn belt developed in the strata is the main ore-bearing strata of iron polymetallic deposits in this area.The structure of the mining area is basically a monoclinal structure with NNE inclination.Due to the serious land cover,the fault structure is not clear.Acid granites are widely distributed in the mining area,and the intrusive rock age belongs to the Late Triassic.The research result shows that the medium-acid intrusive rocks in this area belong to calc-alkaline series with high crystal differentiation on the whole.The lithology is mainly granitic,island arc granite,and the genetic types belong to type I and type A respectively.For a concealed and buried deposit,a total of 145 ore bodies have been delineated in the mining area.The main ore body Fe1 is produced in a strip,the length of the ore body is about 1000 m,the inclination angle is 40°~60°,the average thickness is 15.24 m,and the average grade is mFe30.88%.The mineral composition of the ore is relatively simple,the metal minerals are mainly magnetite,and there are chalcopyrite,sphalerite,pyrrhotite and so on.The main useful component of ore is Fe,and the co-associated beneficial components that can be comprehensively utilized are Au,Cu,Zn and Mo.The genetic type of the deposit is a contact metasomatic(skarn)-hydrothermal iron polymetallic deposit.According to the analysis,it is considered that there is still a great potential for increasing reserves in the mining area.

关 键 词：地质特征 找矿方向 铁多金属矿 它温查汉 青海 

分 类 号：P618.31[天文地球—矿床学] P612[天文地球—地质学]