摘要
云南兰坪金顶超大型铅锌矿,同时也是大型黄铁矿、大型石膏和天青石矿,对其成因存在较大的分歧,主要有热液充填交代型、层控后生型矿床、同生沉积矿床和喷流(热水)沉积矿床等观点,尤以喷流(热水)沉积矿床占主导地位。实际上,要分析矿床的成因,探明其相关的地质问题,如矿区地层和沉积相、赋矿层位和灰岩角砾岩的成因等是至关重要的,也是研究和讨论该矿床成因和类型的前提条件。在大量充分搜集前人的研究成果基础上,结合野外的实际考察和室内综合研究,对在研究矿床成因时不可忽视的一些地质问题进行详细研究结果表明:金顶铅锌矿床赋存于景星组(K1j)和早第三系云龙组中,并受后期推覆断裂的控制;赋矿层位地层的古环境为极浅水环境(河湖和盐湖环境);所发现的证据更支持金顶铅锌矿属后生充填型层控矿床的观点。
The strata of Jinding Lead-Zinc deposit consist of the intra-basin strata system and the overthrusting strata system. The intra-basin strata system is composed of Yunlong Formation (E_1y) (lacustrine facies),and the overthrusting strata system is composed of Shanhedong Formation (T_3s) (carbonate platform facies),Maichuqing Formation (T_3m) (tidal flat-lagoon facies), Huakaizuo Formation (J_2h) ( tidal flat facies) and Jingxin Formation (K_1j) (river facies). It is considered that the upper ore-bearing zone in Jinding Lead-Zinc deposit belongs to Jingxin Formation (K_1j), the lower one belongs to Yunlong Formation (E_1y). The limestone breccia, one of the main ore-holding rock,is resulted from the fault overthrusting instead of deposition.According to the geological chracteristics,the possibility that the Jinding Lead-Zinc deposit is formed by exhalation can be ruled out .It may be epigenetic infilling type strata-bounded ore deposit,which is related to post-overthrusting structure process.The F_2 fault acts as the passage for the migration of ore-forming solution and the overthrusting nappe provides the space for the formation of ore and act as a cap layer for Jinding lead-zinc deposit.
出处
《矿物岩石》
CAS
CSCD
北大核心
2004年第1期48-51,共4页
Mineralogy and Petrology
基金
国家攀登预选项目 (编号为 95 预 3 9
3 1
2 )
国土资源部重点科技攻关项目 (编号为 950 1 1 0 3 )
