黔东南那哥铜铅多金属矿床的矿化时空结构

黔东南那哥铜铅多金属矿床位于扬子陆块与华夏陆块的过渡带上,该区经历了自四堡期以来的多期构造活动,岩浆活动频繁,变形-变质强烈,构造形迹复杂;通过深入剖析矿床地质特征,结合区域地质演化史,从铜铅矿化的时空结构分析入手,系统研究了矿体空间定位规律。研究结果表明,在时间结构上,成矿与重大地质事件关系密切,具有多阶段成矿的特点;在空间结构上,矿体主要受控于尾硐溪断裂,赋存于断裂带走向上的弧形转弯处、断裂面的凹凸变化部位,矿体具膨大狭缩、尖灭再现特点,在空间上具有向W侧伏的趋势。

Temporal-spatial structures of mineralization for Nage copper-lead polymetallic deposit, southeast Guizshou province

The Nage copper-lead polymetallic deposit is located at the transitional zone of the Yangtze and the Cathaysia landmass.This region went through a long-term and multi-stage tectonic activity since Sibao Period.It is characterized by complex geological structures,frequent magmatic activities and various degrees of metamorphism.Based on the analysis of geological features combined with geological evolutional history of regional mineralization,the author has systematically summarized the location pattern of orebody.The results show that in temporal structures,the copper-lead mineralization is closely related to geological mega-events and characterized by multi-period and stage and inheritability; while in spatial structures,the copper-lead orebody is controlled by Weidongxi fracture zone（F2）strictly,hosting in the arc turning zone caused by along-strike variation on the plane and the concave-convex transition of fracture on profile,and where the enlargement and narrowing occurred on the plane and profile.Westward lateral trending is also an important character of the orebody.