西藏库拉岗日穹窿次麦矽卡岩型锡铁铅锌多金属矿床的发现及其意义  

Discovery of the Cimai Skarn-type Sn-Fe-Pb-Zn Polymetallic Deposit in Kulagangri Dome,Xizang,and Its Prospecting Implications

作　　者：付建刚 李光明 郭伟康 张海 董随亮 张林奎 李应栩 马国桃 焦彦杰 FU Jiangang;LI Guangming;GUO Weikang;ZHANG Hai;DONG Suiliang;ZHANG Linkui;LI Yingxu;MA Guotao;JIAO Yanjie(Department of Mineral Geology,Chengdu Center,China Geological Survey(Geosciences Innovation Center of Southwest China),Chengdu 610218,Sichuan,China)

机构地区：[1]中国地质调查局成都地质调查中心(西南地质科技创新中心)矿产地质室,四川成都610218

出　　处：《大地构造与成矿学》2024年第4期724-736,共13页Geotectonica et Metallogenia

基　　金：国家自然科学基金项目(91955208);第二次青藏高原综合科学考察研究项目(2019QZKK0806);国家重点研发计划项目(2021YFC2901903);国家重点研发计划“战略性矿产开发利用”重点专项项目(2023YFC2908400);中国地质调查局项目(DD20242104)联合资助。

摘　　要：库拉岗日穹窿位于西藏北喜马拉雅片麻岩穹窿带东段,毗邻北部的拉隆穹窿。通过1∶5万矿产地质填图和稀疏地表工程控制,在库拉岗日穹窿东部发现了一具有大型矿床潜力的次麦锡铁铅锌多金属矿床,其中Sn-Fe和Pb-Zn-Ag矿体主要赋存于矽卡岩中,属于矽卡岩型矿床。该矿床的矿体品位高,厚度大,主要金属矿物有锡石、磁铁矿、方铅矿、闪锌矿、黄铁矿、白钨矿和镜铁矿等;非金属矿物有石英、方解石、云母、绿帘石、绿泥石、透闪石、阳起石和符山石等。目前,稀疏的地表工程已控制2条Sn-Fe矿体和5条Pb-Zn-Ag矿体,且矿区内钨也显示出良好的成矿前景。综合评估表明,次麦矽卡岩型锡铁铅锌多金属矿床的资源潜力巨大,其矿化特点与成矿元素组合独特,以锡石和磁铁矿共生为特点,明显不同于北喜马拉雅成矿带其他矿床,是一种新的矿床类型。该矿床的发现对认识和理解北喜马拉雅成矿带稀有金属成矿作用与穹窿构造淡色花岗岩成矿系统有重要意义。The Kulagangri dome is located in the eastern part of the North Himalayan Gneiss Domes(NHGD).Based on the 1︰50000 mineral geological mapping and sparse surface engineering,the Cimai Sn-Fe-Pb-Zn polymetallic deposit was first found in the eastern part of the Kulagangri Dome.The Sn-Fe and Pb-Zn-Ag ore bodies are hosted by the skarn.The ore bodies are characterized by high grade and large thickness.The main metal minerals are cassiterite,magnetite,galena,sphalerite,pyrite,scheelite,and specularite,whereas the non-metallic minerals mainly include quartz,calcite,mica,epidote,chlorite,tremolite,actinolite,and idocrase.At present,there are 2 Sn-Fe ore bodies and 5 Pb-Zn-Ag ore bodies controlled by surface engineering in the Cimai deposit.In addition,tungsten also exhibits good metallogenic potential.These results show that the Cimai skarn-type Sn-Fe-Pb-Zn polymetallic deposit has great resource potential.The newly discovered Cimai Sn-Fe-Pb-Zn polymetallic deposit is characterized by unique mineralization characteristics and metallogenic element combinations and is characterized by the skarn-type Sn-Fe ore bodies.This deposit is obviously different from the Zhaxikang Pb-Zn-Sb deposit in the Northern Himalayan belt and is a new type of deposit in the Himalayan belt with great potential.It is of great significance to understand the mineralization of rare metals and the metallogenic systems associated with leucogranites in domes in the North Himalayan belt.

关 键 词：锡铁铅锌矿 矽卡岩型 库拉岗日穹窿 找矿意义 北喜马拉雅成矿带 青藏高原 

分 类 号：P617[天文地球—矿床学] P612[天文地球—地质学]