【摘要】 湘中是全球最大的锑金矿集区，近年来又陆续探明了一批钨矿床，但这些钨矿和锑金矿之间的关系目前尚不明确。曹家坝钨矿床是目前该矿集区内规模最大的钨矿床（19.03Mt@0.37%WO₃）,矿体与矽卡岩密切共生，成矿作用划分为矽卡岩阶段、退化蚀变阶段和石英-白钨矿-硫化物阶段。不同阶段白钨矿δ¹⁸O_V-SMOW变化范围为6.0‰～7.9‰,δD_V-SMOW变化范围为-79.1‰～-68.9‰,对应的δ¹⁸O_H2O变化范围为3.3‰～5.2‰。白钨矿(⁸⁷Sr/⁸⁶Sr)_t变化范围为0.72215～0.73049,ε_Nd（t）变化范围为-12.8～-10.6。龙山锑金矿床是矿集区内发育的大型脉状锑金矿床（4.2Mt@3.4%Sb和3.7g/t Au）,矿体赋存在震旦系江口组板岩中，发育两个世代的白钨矿与辉锑矿共生。白钨矿δ¹⁸O_V-SMOW变化范围为5.4‰～9.0‰,δD_V-SMOW变化范围为-72.9‰～-60.2‰,对应的δ¹⁸O_H2O变化范围为3.1‰～6.7‰。Sr-Nd-H-O多元同位素特征显示，曹家坝钨矿床的成矿物质和成矿流体以岩浆来源为主，龙山锑金矿床有岩浆流体参与成矿，两者均有少量板溪群基底地层和大气降水的加入。综合本次及前人研究成果，曹家坝钨矿床和龙山锑金矿床具有成因联系，二者均是湘中矿集区晚三叠世岩浆热液W-Sb-Au成矿系统的重要组成部分。更多还原

【Abstract】 The Xiangzhong has been the largest Sb-Au ore district in the world so far. In recent years, a number of W deposits have been discovered in this area, however, the relationship between the W and Sb-Au mineralization is still unclear. The Caojiaba deposit is the largest W deposit in the ore district up to now（19.03Mt@ 0.37% WO₃）, whose ore bodies are closely related to skarn, i.e., its mineralization is characterized by an early prograde skarn overprinted by a retrograde assemblage, and then by quartz-scheelite-sulfide veins. Geochemically, the δ¹⁸O_V-SMOW and δD_V-SMOW of scheelites formed at different stages of the deposit range from 6.0‰ to 7.9‰ and from-79.1‰ to-68.9‰, respectively, with corresponding δ¹⁸O_H2O values varying from 3.3‰ to 5.2‰; while the(⁸⁷Sr/⁸⁶Sr)_t and ε_Nd（t） of the scheelites range from 0.72215 to 0.73049, from-12.8 to-10.6, respectively. The Longshan deposit is a large lode Sb-Au deposit in the ore district（4.2Mt@ 3.4% Sb and 3.7g/t Au）. The ore body is hosted within Sinian Jiangkou Formation slate, and two generations of scheelites are associated with stibnite. The δ¹⁸O_V-SMOW and δD_V-SMOW of scheelite range from 5.4‰ to 9.0‰ and from-72.9‰ to-60.2‰, respectively, with corresponding δ¹⁸O_H2O values ranging from 3.1‰ to 6.7‰. The Sr-Nd-H-O isotopic compositions show that ore-forming material and fluid of the Caojiaba tungsten deposit were mainly derived from the magmatic-hydrothermal system. The magmatic fluid was involved in the mineralization of the Longshan Sb-Au deposit, and minor Banxi Group basement strata and meteoric water were involved in the ore-forming process of the Caojiaba and Longshan deposits. Based on the results of this study and previous work, the Caojiaba W deposit and the Longshan Sb-Au deposit are genetically related to each other, i.e., both of them are important components of the Late Triassic magmatic hydrothermal W-Sb-Au metallogenic system in the Xiangzhong ore district.更多还原