【摘要】 <正> “东川式铜矿”早先指云南东川元古界昆阳群落雪白云岩中的层状铜矿。曾视为中温热液矿床。至今,矿床成因认识翻新。且发现:该式矿床分布广泛(北至四川通安,南达云南元江),成多层产出,产状多样。然而,它们总是赋存在昆阳群的一定岩相建造与地层层位中,可通称之为层控矿床。笔者试以其近年来对该式矿床的初步研究成果并参考有关资料来探讨矿床的层控条件与成矿作用问题。更多还原

【Abstract】 The present article deals with the following contents: the ore bearing rock series and specific ore horizons of Dongchuan type copper ore deposit, the water basins which accumulated ores and their facies, relaton between the Red Bed and the copper source, the diagenesis and the metallogenesis, the reef building stromatolith and the mineralization, the tectonism and the rejuvenated mineralization, the effect of the volcanism on the mineralization, etc.This paper indicates that Dongchuan type copper ore deposit from Group Kunyang in the Kangdian Earth’s Axis occured from the sedimentary tuff-carbonate copper bearing formation of the Kangdian pre- cambrian geosycline, subsiding during the middle stage of its development. It includes the layered copper ore deposits in two main specific ore horizons and the veined copper ore deposits in an important specific ore horizon. They are all strata-bound ore deposits.The paper holds that the bay or lagoon area of the after-reef of stromatolith and the bathyal region of the fore-reef were water basins which accumulated copper ores, the former corresponding facies being syngenetic dolomite facies of bay or lagoon of after-reef, the latter black shale-dolomite facies of fore-reef; The Red Bed underlying the ore bearing bed is the near source bed of Cu; The layered copper ore deposits originated in the diagenesis and related closely to stromatolith, but did not relate directly to tuff in the sedmentary genesis.The strong tectonic movement of the late stage of the development of the geosyncline provided enough heat energy and produced the tectonic hydrothermal solution that remolded, removed and deposited again the copper from the already formed layered copper ore deposits, which engendered the authineomorphic copper ore deposit or the veined ore courses. The necessary conditions of ore genesis are the copper source bed (layered copper ore deposit) and the ore storing bed (dolomite of overlying strata or of upper wall of the layered copper ore deposit) as well as faults.To study the link between the layered copper ore deposit and the veined copper ore deposit in space, time and genesis is beneficial to the synthetic searching for this kind of mineral deposit and enlarging the ore reserves.更多还原