摘要
云南澜沧老厂多金属矿床是滇西昌宁-孟连晚古生代裂谷带中的重要矿床之一。2008年以来,在矿区Ⅰ号铅锌银矿体群之下发现和确认新的含铜黄铁矿体群(V号矿体群)。该类矿体群受地层及岩性控矿明显,赋存于下石炭统裂谷型火山-沉积建造中(C1+56),产状与含矿地层一致,围岩主要为凝灰岩、沉凝灰岩和白云质灰岩。矿石中常见微细粒结构和纹层状构造。它与Ⅰ号矿体群之间构成"上黑下黄"的矿体分带。尽管矿体受后期构造影响变形,并受新生代岩浆热液成矿作用的改造-叠加,但仍具有火山喷流成因块状硫化物矿床的基本特征。研究还表明,本类矿体中铜的资源储量达到中型规模,是矿区重要的成矿类型和资源类型之一,可作为良好的近期接替资源,对其开发利用,能大幅缓解矿山的资源危机。
The Laochang polymetallic deposit in Lancang county, Yunnan Province is one of the important deposits in the southern part of the Changn- ing-Menglian late-Palaeozoic continental rift belt. Since 2008,some new copper-bearing pyritic bodies,called No.5 ore cluster,have been discovered and confirmed beneath the sequence of No. 1 Pb-Zn-Ag ore cluster in this deposit. This kind of ore bodies,whose attitude is similar to that of ore-bearing strata, occurs in the Lower Carboniferous basic volcanic-sedimentary formation formed in a continental rift environment and is mainly controlled by the stra- ta and lithology. Their host rocks are mainly tuff,tuffite and dolomitic limestone. The ores in No. 5 ore cluster are characterized by micro-fine grained tex- tures and striped-lamellar structures. An ＂upper black-lower yellow＂ type ore body zone bounds between No. 1 and No. 5 ore clusters. Although the ore bodies were subjected to intense deformation from late tectonic activity and to transformafion-superimposition from the Himalayan magmatic hydrothermal process ,they still have the general characters of the volcanic-exhalative-sedimentary massive sulfide deposits. This study also indicates that the No. 5 ore cluster is one of the important mineralization types and resource types in the region. Because of attaining to a medium-sized copper deposit in the total re- sources of Cu, it will be a good recent succeeding resource which is expected to be explored and used gradually through the combination of exploration and mining, and will reduce the resource crisis by a large scale in the mine.
出处
《地质与勘探》
CAS
CSCD
北大核心
2012年第3期592-600,共9页
Geology and Exploration
基金
国家危机矿山接替资源勘查项目(编号:200653056
20089943)资助
关键词
含铜黄铁矿体
地质特征
成因
资源意义
澜沧老厂
copper-bearing pyrite body, geological character, genesis, resource significance, Laochang in Lancang
