岩石矿物学杂志2011，Vol.30Issue(3)：507-518,12.
兰坪盆地北部白秧坪铅锌铜银多金属矿床地质特征
Geological characteristics of the Baiyangping Pb-Zn-Cu-Ag polymetallic deposit in northern Lanping basin
摘要
Abstract
The Baiyangping lead-zinc-copper-silver polymetallic deposit in Lanping basin is composed of a few ore veins and can be divided into several ore blocks.Researches on ore geological features and mineralization characteristics of different ore blocks of the ore deposit have been very insufficient.Based on an analysis of data available in combination with field geological survey, it can be concluded that the strata in the ore district comprise mainly Mesozoic sedimentary rocks.Three main cross-cutting fault systems are observed in the ore district, namely nearly north-south-striking faults, NWW-striking faults and NE-SW-striking faults.Ore bodies are evidently controlled by faults in different ore blocks and have no obvious affinity with any special strata and lithology; they primarily occur in the fault zone, with some in fractures, cleavages and space of wall rock collapse.There are breccia ore, massive ore, veinlike ore and disseminated ore, suggesting they were formed by filling epigenetic mineralization.In different ore blocks, mineral composition and association of elements are somewhat different: in Liziping and Wudichang ore blocks, the main minerals include sphalerite, gratonite, galena, jordanite, realgar and orpiment, comprising the Pb-Zn-As-Sb-Ag element assemblage; in Fulongchang ore blocks, the main minerals include sphalerite, jordanite, galena, tetrahedrite series minerals, bournonite, argentite and kongsbergite, composing the Pb-Zn-Cu-Ag element assemblage; in Fulongchang ore blocks, the main minerals include tetrahedrite series minerals, chalcocite, chalcopyrite, jordanite, cobaltine, siegenite, cobalt-bearing arsenopyrite, galena and sphalerite, composing the Cu-Co-As-Zn-Pb element assemblage.A comprehensive analysis reveals that there were two mineralization events in the Baiyangping ore district, one responsible for the main copper mineralization between late Paleocene and early Eocene, the other for main lead and zinc polymetallic mineralization in late Eocene-early Oligocene period.The lead and zinc ore-forming fluids activated early copper element and formed the Pb-Zn-Cu polymetallic assemblage in Fulongchang and Baiyangping ore blocks.The mineralization probably occurred at the stage of short-term stress relaxation after strong extrusion when the wall rocks supplied open space, and ore-forming fluids poured into the space to form ore deposit.关键词
兰坪盆地/白秧坪/铅锌多金属/矿床地质Key words
Lanping basin/ Baiyangping/ lead-zinc polymetallic deposit/ geological feature分类
天文与地球科学引用本文复制引用
王晓虎,宋玉财,侯增谦,张洪瑞,王哲,庄天明,张翀,张天福..兰坪盆地北部白秧坪铅锌铜银多金属矿床地质特征[J].岩石矿物学杂志,2011,30(3):507-518,12.基金项目
国家科技支撑计划资助项目(2006BA01A08) （2006BA01A08）
973 资助项目(2009CB421008) （2009CB421008）
国家自然科学基金资助项目(U09336051) （U09336051）
国土资源大调查资助项目(1212010818096) （1212010818096）
