西藏嘎拉勒铜金矿床成矿物质来源探讨____来自硫、铅、碳和氢氧同位素地球化学特征的证据
投稿时间:2017-04-30  修订日期:2017-07-10  点此下载全文
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作者单位E-mail
李志军) 成都理工大学 lizhiiun@cdut.cdu.cn 
唐菊兴 中国地质科学院矿产资源研究所,国土资源部成矿作用与资源评价重点实验室  
赵润东 成都理工大学  
何子轩 成都理工大学  
张志 中国地质调查局成都地质调查中心  
李丕蓉 成都理工大学  
尤孟 成都理工大学  
何珊 成都理工大学  
郭奇奇 成都理工大学  
欧俊 成都理工大学  
基金项目:中国地质调查局基础性公益性地质矿产调查项目(DD20160026)、四川省科技计划项目(2017JY0143)、四川省教育厅一般项目(14ZB0062)
中文摘要:西藏嘎拉勒铜金矿床位于班公湖怒江成矿带西段,是近年来发现的一个大型镁质矽卡岩型铜金矿床。本文在野外地质调查的基础上,通过S-Pb-C-H-O同位素分析,对嘎拉勒铜金矿床的物质来源进行了探讨。结果表明:①矽卡岩型矿石中黄铜矿的δ34SV-CDT值在硫同位素直方图上呈塔式分布,变化范围为-0.9‰~1.9‰,有少许样品值变化范围较大,表明嘎拉勒矿床硫同位素主要以幔源硫为主,有少量壳源的混染;②208Pb/204Pb变化范围为38.739‰-39.008‰,207Pb/204Pb变化范围为15.588‰-15.701‰,206Pb/204Pb变化范围为18.33‰-18.871‰,显示矿区铅同位素来源以造山带铅为主,少量上地壳铅相结合的特征;嘎拉勒矿床形成于碰撞的造山带环境;③含辉钼矿石英脉中δ18OV-SMOW值范围为12.2‰~12.8‰,平均值12.5‰,δDV-SMOW(‰)范围为-103.3‰~-95.3‰,平均值为-99.3‰,δ18OV-PDB值范围为-18.1‰~ -17.6‰,平均值为-17.85‰,显示受到大气降水加入明显;④矽卡岩中方解石C-O同位素测试结果δ18OV-SMOW为-2‰,δ18OV-PDB为-15.1‰,δ13CV-PDB为15.4‰,显示嘎拉勒铜金矿床碳酸盐为海相碳酸盐并经历了溶解作用。综合表明,嘎拉勒铜金矿床是由幔源成矿流体作用形成的,成矿过程中有大气降水的加入,成矿流体与碳酸盐岩发生接触交代作用形成矽卡岩型铜金矿床。
中文关键词:班公湖-怒江成矿带西段  同位素地球化学  幔源物质  矽卡岩型  铜金矿床  嘎拉勒
 
Source of ore-forming materials in the Galale copper-gold deposit in Tibet ____ Evidence from the geochemical characteristics of sulfur, lead, carbon and hydrogen and oxygen isotopes
Abstract:Tibet Galale copper and gold deposit is located in the western part of the Bangong Lake Nujiang metallogenic belt, is a large-scale magnesia skarn type copper gold deposit discovered in recent years. Based on the field geological survey, the material source of the Galalite gold deposit was discussed by S-Pb-C-H-O isotope analysis.The results show:①the δ34SV-CDT value of chalcopyrite in skarn-type ore is tower-type distribution on the sulfur isotope histogram, and the variation range is -0.9 ‰ ~ 1.9 ‰. There is a large variation in the value of a little sample value, Isotopes mainly mantle-derived sulfur-based, a small amount of shell source mixed with.②The variation range of 208Pb / 204Pb is 38.739 ‰ -39.008 ‰ and the variation range of 207Pb / 204Pb is 15.588 ‰ -15.701 ‰ and the variation range of 206Pb / 204Pb is 18.33 ‰ -18.871 ‰, which indicates that the lead isotopic source in the mining area is dominated by orogenic lead The crustal lead is characterized by the combination; the Galal deposit is formed in the collisional orogenic environment;③ The δ18OV-SMOW range in the quartz vein is 12.2 ‰ ~ 12.8 ‰, with an average value of 12.5 ‰ and δDV-SMOW (‰) ranging from -103.3 ‰ to -95.3 ‰, with an average of -99.3 ‰, δ18OV-PDB The range of values is -18.1 ‰ ~ -17.6 ‰, with an average value of -17.85 ‰, indicating that the precipitation is significantly.④The isotope test results of calcite in skarn are δ18OV-SMOW of -2 ‰, δ18OV-PDB is -15.1 ‰ and δ13CV-PDB is 15.4 ‰, which shows that the carbonate of the Gala-copper-gold deposit is marine carbonate and experienced The dissolution of the role. It is shown that the Galalay copper-gold deposit is formed by the mantle-derived ore-forming fluid, and the meteorite is added in the mineralization process. The ore-forming fluid interacts with the carbonate rocks to form the skarn-type copper-gold deposit.
keywords:The west of the Bangong Lake – Nujiang metallogenic belt,Isotope geochemistry,Mantle material, Skarn, Copper-gold ore deposit,Galale
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