河南省新县姚冲钼矿床流体包裹体研究

CORC > 北京大学 > 地球与空间科学学院

	河南省新县姚冲钼矿床流体包裹体研究; Fluid evolution of the Yaochong porphyry Mo deposit, Xinxian County, Henan Province, China
	王玭 ; 杨永飞 ; 糜梅 ; 李忠烈 ; 王莉娟
刊名	岩石学报
	2013
关键词	流体包裹体富CO2流体斑岩型钼矿床大陆碰撞大别造山带 Fluid inclusions CO2-rich fluid Porphyry Mo deposit Continental collision Dabie orogenic belt
英文摘要	河南省新县姚冲钼矿床产于大别造山带,属于陆-陆碰撞体制的斑岩型矿床,其流体成矿过程可以分为早、中、晚三个阶段,分别以石英+钾长石±黄铁矿±磁铁矿、石英±钾长石+辉钼矿±其他硫化物和石英±碳酸盐±萤石组合为标志.热液石英和萤石中发育纯CO2包裹体(PC型)、CO2-H2O型包裹体(C型)、水溶液包裹体(W型)和含子晶多相包裹体(S型).早阶段石英中发育纯CO2包裹体、CO2-H2O型包裹体和含子晶多相包裹体,中阶段的石英则发育CO2-H2O型包裹体、水溶液包裹体和含子晶多相包裹体,在晚阶段的无矿石英脉中发育水溶液包裹体和少量的CO2-H2O型包裹体,石英-碳酸盐-(萤石)脉石英与萤石中只发育水溶液包裹体.早阶段流体包裹体的均一温度为277～ 380℃,集中于300～ 360℃,盐度变化于3.0％～10.3％ NaCleqv之间.中阶段包裹体均一温度介于185 ～ 351℃之间,集中在260～ 320℃,盐度介于2.4％～9.3％NaCleqv；晚阶段包裹体均一温度为139 ～245℃,盐度介于0.7％～6.3％ NaCleqv之间.中阶段多相包裹体中常见黄铜矿和其他透明子矿物,表明流体具有还原性、过饱和的特征,是矿石矿物沉淀的主要阶段.估算早、中阶段流体捕获压力分别集中于47 ～ 131MPa和26 ～118MPa,所对应的成矿深度分别约为4.7km和2.6～4.2km.上述流体包裹体的研究表明姚冲钼矿床的初始成矿流体具有高温、高盐度、富CO2的特征,同时预测了深部找矿潜能.; The Yaochong porphyry Mo deposit in Xinxian County, Henan Province, China, is located in the Dabie orogenic belt Mo mineralization formed in continental collision settings. The hydrothermal ore-forming process can be divided into the early, middle and late stages, characterized by mineral assemblages of quartz + potassic feldspar +/- pyrite +/- magnetite, quartz +/- potassic feldspar + molybdenum +/- other sulfides and quartz +/- calcite +/- fluorite, respectively. There are four fluid compositional types determined in hydrothermal quartz and fluorite from early to late: pure CO2, CO2-H2O, aqueous and solid-bearing fluid inclusions (FIs). The early-stage quartz contains three of the four types FIs other than the aqueous type. The middle-stage quartz has CO2-H2O, aqueous and solid-bearing FIs, without pure CO2 FIs. In the late stage, a small amount of CO2-H2O FIs can be observed in quartz of barren quartz veins, while in quartz-carbonate-(fluorite) veins, only the aqueous FIs are present. Fluid inclusions in the early-stage quartz are homogenized at temperatures of 277 similar to 380 degrees C, clustering at 300 similar to 360 degrees C, with salinities mainly ranging from 3.0% to 10.3% NaCleqv. Fluid inclusions in the middle stage quartz yield homogenization temperatures of 185 degrees C to 351 degrees C, with most between 260 degrees C and 320 degrees C, and salinities of 2.4% to 9.3% NaCleqv. Fluid inclusions in the late stage are totally homogenized at temperatures of 139 similar to 245 degrees C, yielding salinities of 0.7% similar to 6.3% NaCleqv. The estimated pressures decrease from a span of 47 similar to 131MPa in the early stage, to a range of 26 similar to 118MPa in the middle stage, corresponding to a change in depths from 4.7km to 2. 6 similar to 4.2km. We conclude that the initial fluids forming the Yaochong deposit is high temperature, high salinity and CO2-rich, and predict that the deeper exploration is potential for ore prospecting.; 国家973项目; http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000315130500008&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701 ; SCI(E); 中文核心期刊要目总览(PKU); 中国科技核心期刊(ISTIC); 中国科学引文数据库(CSCD); 6; 1; 107-120; 29
语种	中文
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/392320]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	王玭,杨永飞,糜梅,等. 河南省新县姚冲钼矿床流体包裹体研究, Fluid evolution of the Yaochong porphyry Mo deposit, Xinxian County, Henan Province, China[J]. 岩石学报,2013.
APA	王玭,杨永飞,糜梅,李忠烈,&王莉娟.(2013).河南省新县姚冲钼矿床流体包裹体研究.岩石学报.
MLA	王玭,et al."河南省新县姚冲钼矿床流体包裹体研究".岩石学报 (2013).