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青海德令哈蓄集银铅矿床地质与S-Pb同位素组成及其成矿学意义
Geology and S-Pb isotope composition of the Xuji Ag-Pb deposit in Delingha of Qinghai Province and its implications for metallogenesis
投稿时间:2019-12-13  
中文关键词:矿床地质  S-Pb同位素组成  蓄集银铅矿床  宗务隆构造带  青海
英文关键词:ore geology  S-Pb isotope composition  Xuji Ag-Pb deposit  Zongwulong belt  Qinghai
基金项目:青海省科技重点研发资助项目(2018-SF-109)
作者单位E-mail
陈敏 中国地质大学(北京)地球科学与资源学院, 北京 100083
青海大学 地质工程系, 青海 西宁 810016 
 
薛春纪 中国地质大学(北京)地球科学与资源学院, 北京 100083
青海大学 地质工程系, 青海 西宁 810016 
chunji.xue@cugb.edu.cn 
赵文涛 青海大学 地质工程系, 青海 西宁 810016  
薛万文 青藏高原 北部地质过程与矿产资源青海省重点实验室, 青海 西宁 810000  
谷强 武警黄金第六支队, 青海 西宁 810000  
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中文摘要:
      蓄集矿床是宗务隆构造带内发现的重要银铅矿床。蓄集银铅矿床赋存于石炭-二叠系宗务隆群果可山组灰岩夹千枚岩地层中,矿体呈脉状、透镜状、似层状,明显受近东西走向的断裂构造控制,矿体围岩蚀变主要为硅化和绢云母化,矿石矿物主要为方铅矿和银黝铜矿,脉石矿物主要为石英,矿石具有斑杂状和网脉状构造。对该矿床开展了S-Pb同位素组成分析。硫同位素分析结果表明矿石中硫化物矿物δ34S值变化于5.0‰~8.4‰之间,显示硫主要为岩浆来源,有少量地层的贡献;铅同位素分析结果表明,矿石206Pb/204Pb=17.896~17.922,207Pb/204Pb=15.589~15.617,208Pb/204Pb=38.072~38.166,与围岩铅同位素组成(206Pb/204Pb=17.949~18.976,207Pb/204Pb=15.600~15.696,208Pb/204Pb=38.106~40.943)较为相似,而与蓄集峡口闪长岩铅同位素组成(206Pb/204Pb=18.144~18.589,207Pb/204Pb=15.623~15.636,208Pb/204Pb=38.790~39.033)相差较大,反映成矿物质主要来自围岩地层宗务隆群果可山组。综合分析认为,蓄集银铅矿床与宗务隆构造带晚二叠世岩浆活动关系密切,应属岩浆热液为主的热液充填-交代成因类型。
英文摘要:
      The Xuji deposit is an important Ag-Pb deposit found in the Zongwulong belt. Geologically, the ore deposit is hosted in the Carboniferous-Permian Guokeshan Formation of Zongwulong Group, and consists of limestone intercalated with phyllite. The orebodies are veinlike, lenticular and stratoid in shape and are controlled by EW-trending faults. The alteration of ore-bearing wall rock is mainly manifested as silicification and sericitization. Ore minerals are mainly galena and silver tetrahedrite, gangue minerals are mainly quartz, and the ore exhibits variegated and reticulate structure. In this paper, the authors analyzed S and Pb isotopic composition characteristics in this deposit. The results of sulfur isotope analysis show that the δ34S values of sulfide minerals in the ores range from 5.0‰ to 8.4‰, indicating that the sulfur mainly came from magma with a small stratigraphic contribution. The lead isotopic compositions, 206Pb/204Pb, 207Pb/204Pb and 208Pb/204Pb are from 17.896 to 17.922, 15.589 to 15.617 and 38.072 to 38.166 for ore sulfide minerals, respectively, which are similar to the features of wall rocks (206Pb/204Pb=17.949~18.976, 207Pb/204Pb=15.600~15.696,208Pb/204Pb=38.106~40.943) and are different from the features of Xujixiakou diorite (206Pb/204Pb=18.144~18.589, 207Pb/204Pb=15.623~15.636, 208Pb/204Pb=38.790~39.033), indicating that the metals were mainly from the Guokeshan Formation of Zongwulong Group. A comprehensive analysis shows that the Xuji deposit was related to the late Permian magmatic activity in the Zongwulong belt and the genesis of the deposit seems to be magmatic hydrothermal filling-replacement.
陈敏,薛春纪,赵文涛,薛万文,谷强,2020,青海德令哈蓄集银铅矿床地质与S-Pb同位素组成及其成矿学意义[J].岩石矿物学杂志,(4):454~468.
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