摘要
滇中地区的中生代砂岩型铜矿具有辉铜矿-斑铜矿-黄铜矿-黄铁矿的分带顺序,经典理论认为这种分带顺序主要是由Eh值控制的。对大姚铜矿床的矿物分带的研究证实此分带是成立的,然该矿S同位素推演成矿温度(323.8 K),计算发现在还原条件下(Eh<0.314),这个分带主要受pH值控制,以辉铜矿作为主要矿石矿物的富集带是在碱性(pH>6.23)环境中形成的。此理论分析与实际矿物分带中的胶结物组分分析相吻合,即碱性胶结物(碳酸盐胶结)处可出现富矿,此规律对大姚铜矿的找矿有指导意义。
Mesozoic sandstone-type copper deposit in Central Yunnan region is of zoning order of chalcocite-bornite-chalcopyrite-pyrite.The classical theory suggests that such a sequence of sub-zoning is mainly controlled by the Eh value.According to ore-forming temperature（323.8 k）,combined with the isotope and generating thermodynamic Eh-pH diagram,the zonation of Dayao copper deposit is mainly controlled by pH value in reduction conditions（Eh0.314）.The enrichment belt of chalcocite occurred as the main ore minerals forms in the alkaline environment（pH6.23）.Theoretical analysis is consistent with the analysis of the cement component in practical mineral zoning,namely the mineral is rich in alkaline cement（carbonate cement）,which is significant for the future prospecting in Dayao copper deposit.
出处
《矿物岩石》
CAS
CSCD
北大核心
2010年第2期77-81,共5页
Mineralogy and Petrology
基金
危机矿山接替资源勘查试点项目(2002uBBEA05B004)
云南省省院省校科技合作项目(2002UBDEA05B004)
关键词
Eh-pH相图
分带模式
铜矿床
胶结物
同位素分馏
Eh-pH diagram
zoning model
copper deposit
cement component
isotope fractionating
