河南栾川中鱼库矽卡岩矿物学特征及地质意义  

Characteristics and geological significance of skarn minerals from the Zhongyuku sulfide-zinc polymetallic deposit in Luanchuan,Henan,China

作　　者：胡昕凯 张寿庭[1] 曹华文[2] 裴秋明 夏炳卫 赵玉[1] 王亮[1] HU Xinkai ZHANG Shouting CAO Huawen PEI Qiuming XIA Bingwei ZHAO Yu WANG Liang(School of Earth Sciences and Resources,China University of Geosciences,Beijing 100083,China Chengdu Center,China Geological Survey,Chengdu 610081,China)

机构地区：[1]中国地质大学地球科学与资源学院,北京100083 [2]中国地质调查局成都地质调查中心,成都610081

出　　处：《成都理工大学学报（自然科学版）》2017年第3期318-333,共16页Journal of Chengdu University of Technology: Science & Technology Edition

基　　金：中国地质调查局地质调查项目(1212011220925);国家"十二五"科技支撑计划项目(2011BAB04B06)

摘　　要：河南栾川中鱼库硫锌多金属矿床是近年来发现的矽卡岩型硫锌多金属矿床,为进一步探讨其成矿机制,本文以矽卡岩矿物为研究对象,开展了野外观察、岩矿鉴定和电子探针分析综合研究。研究表明,矿床成矿阶段可细分为早矽卡岩阶段、退化蚀变阶段(晚矽卡岩阶段)、石英-硫化物阶段、石英-碳酸盐阶段。该矿床矽卡岩为交代成因的钙矽卡岩,石榴子石以钙铁榴石-钙铝榴石系列为主,辉石以透辉石-钙铁辉石系列为主,帘石主要为绿帘石,角闪石为钙角闪石,绿泥石为铁镁绿泥石。石榴子石、辉石端元组分特征显示矽卡岩阶段成矿流体经历了从酸性到碱性、从还原到氧化的转变。随着流体演变,从退化蚀变阶段到石英-硫化物阶段,成岩成矿环境逐渐从氧化环境过渡到还原环境。石英-硫化物阶段是成矿主阶段,在此阶段金属硫化物大量富集和沉淀。Systematic field work,microscopic identification and electron microprobe technology are carried out to study the mineralogical characteristics of skarn and to discuss the petrogenic and metallogenic mechanism in the Zhongyuku sulfide-zinc polymetallic deposit.It reveals that the ore deposit has experienced four ore-forming stages,such as skarn stage,retrograde alteration stage,quartz sulfide stage and carbonate stage,respectively.The skarns in the Zhongyuku deposit belong to typical calcic skarns resulted from the replacement of granitoid magma.Garnets in the ore deposit are mainly composed of andradite-grossularite and the pyroxenes mainly belonging to diopside-andraditeseries.Amphiboles in the ore show characteristics of calciferous amphibole,and the chlorites are mainly brunsvigite.Components of garnet and pyroxene suggest that the ore-forming fluid have an evolutionary trend from acidic to basic and from reduction to oxidation condition at the skarn stage.From the retrograde alteration stage to the quartz sulfide stage,the oxygen fugacity drops with the evolutionary of ore-forming fluid.The metal sulfides are precipitated at the quartz sulfide stage.

关 键 词：秒卡岩 矿物学 硫锌多金属矿床 中鱼库 

分 类 号：P588.312[天文地球—岩石学]