中国中元古代裂谷作用及其对层控铜矿床的控制

本文以中国几个重要的层控铜矿为例,并以东川式铜矿及其成矿构造背景——昆阳拗拉谷为重点,分析了它们的大地构造背景和其它地质特征,指出它们均受裂谷—拗拉谷或类似的拉张-裂陷构造所控制,并归纳了这类矿床的主要特征。

ON THE MIDDLE PROTEROZOIC RIFTING IN CHINA AND ITS CONTROL OVER STRATABOUND COPPER DEPOSITS

From the beginning of middle Proterozoic the evolution of earth's crust reached a new stage whichwas characterized by the worldwide tension-Asa result, intracontinentil faults, rifts, aulacogens and subsidence zones, and continental marginal geosynclines were greatly developed. Middle Proterozoic is also the most important time for the sediment-hosted stratabound copper deposits. The relationship between the geneses of these deposits and the continental rifting has drawn attention of many geologists. Taking Dongchuan type copper deposits as the example, this paper gives an extensive analysis and discussion on the tectonic background of some i ml:ortant middle Proterozoic stratabound copper deposits in China, and points out that they were also controlled by rift-aulacogen or similar tensile depression structures. Some major features of these deposits are also summed up in this paper.