摘要
铁炉坪矿床是豫西重要的大型脉状银多金属矿床之一,为了查明该矿床银的赋存状态和富集机制,开展了矿物学、C-O-S同位素和流体包裹体显微测温研究。结果显示,铁炉坪矿床中银主要以(银)黝铜矿、硫锑铜银矿、辉银矿和自然银等含银矿物产出,少量以次显微包裹体银赋存在硫化物中;碳酸盐矿物的δ^(13)C_(V-PDB)和δ^(18)O_(SMOW)值分别为-3.03‰~-0.61‰和7.93‰~13.73‰,硫化物的δ^(34)S值为-4.49‰~+1.75‰(平均值为-1.53‰),指示铁炉坪矿床成矿流体具有岩浆流体特征。流体包裹体显微测温结果显示,铁炉坪矿床成矿流体具有中低温(113~296℃)、中低盐度(2.07%~12.51%)特征。综合研究表明,成矿流体温度、盐度降低以及p H升高是导致铁炉坪矿床矿石矿物沉淀的主要因素。
The large-scale Tieluping deposit is one of the most important vein-type Ag polymetallic deposits in the western Henan,China.In this paper,we have carried out studies of mineralogy,C-O-S isotopes and fluid inclusion microthermometric measurement to reveal the occurrence and enrichment mechanism of silver in this deposit.The results show that silver mainly occurred in the form of independent silver minerals including argentiferous tetrahedrite,polybasite,argentite,and native silver,with a small amount of invisible silver presented as sub-micron inclusions in sulfides.The δ^(13)C_(V-PDB) and δ^(18)O_(SMOW) values of various carbonates range from -3.03‰ to -0.61‰ and from 7.93‰to 13.73‰,respectively.The δ^(34)S values of sulfides rang from -4.49‰ to +1.75‰,with a mean value of -1.53‰.These C-O-S isotopes indicate that the ore-forming fluid of the Tieluping deposit has the characteristics of magmatic hydrothermal fluid.Microthermometric data of fluid inclusions reveal that the ore-forming fluid was characterized with medium-low temperatures(113~296℃)and medium-low salinities(2.07%~12.51%).Comprehensive studies suggest that the decrease of temperatures and salinities and the increase of pH values of the ore-forming fluid were main factors that triggered the precipitation of ore minerals in the Tieluping deposit.
作者
徐进鸿
吴承泉
张正伟
姜玉平
胡书礼
郑超飞
李溪遥
靳子茹
XU Jin-hong;WU Cheng-quan;ZHANG Zheng-wei;JIANG Yu-ping;HU Shu-li;ZHENG Chao-fei;LI Xi-yao;JIN Zi-ru(Department of Tourism and Geography,Tongren University,Tongren Guizhou 554300,China;State Key Laboratory of Ore Deposit Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550081,China;University of Chinese Academy of Sciences,Beijing 100049,China;Henan Yudi Science and Technology Group Co.,Ltd.,Zhengzhou 450053,China;Enterprise Alliance Service Center,Wuyi University,Jiangmen Guangdong 529000,China)
出处
《矿物岩石地球化学通报》
CAS
CSCD
北大核心
2024年第2期352-371,共20页
Bulletin of Mineralogy, Petrology and Geochemistry
基金
铜仁学院博士科研启动基金项目(trxyDH2016)
贵州省教育厅高等学校科学研究项目青年项目(黔教技[2022]349号)
铜仁市科技计划项目(铜市科研[2022]64号)
NSFG-新疆联合基金资助项目(U1603245)
国家自然科学基金资助项目(41703051)。
关键词
银的赋存状态
富集机制
脉状Ag多金属矿床
铁炉坪
豫西
occurrence of Ag
enrichment mechanism
vein-type Ag polymetallic deposit
Tieluping
western Henan
