滇东华力西期不整合面含金性

多年对滇东地质勘查和矿业开发研究中发现，区内各金矿床(体)的赋存部位，多沿被动大陆边缘华力西期不整合面分布。由于区内华力西期不整合面明显受到边缘NS两侧两条深大断裂控制，多期NE～SW向左行剪切挤压作用，使不整合面上下地块以其为差异变形轴，旋转产生多期构造剥离或错移，在不整合面上下层位中形成较发育的构造剥离空间、张裂带或板劈理带。这些略呈线型分布的构造挤压带，在地史发展过程中，卷入多期构造变形后演变成局限断裂陷槽或槽沟环境，沉积了一套有别于其它区域的岩性组合。边缘深大断裂多期次海底基性火山喷发或喷流作用。除提供了幔源、壳源含金物质和含矿热液的活化与迁移的通道外，再次卷入构造变形的这些局限断裂陷槽或槽沟又成为区域金成矿物质聚集的有利场所，含矿热液选择沉积其内或堆积其中的细碎屑岩、粘土质岩、含碳质泥质岩类、不纯碳酸盐岩进行交代与沉淀，不受层控的影响，形成了滇东沿华力西期不整合面或接触带金成矿带。

ON THE GOLD-BEARING ABILITY OF VARISCAN UNCONFORMITY IN EAST YUNNAN

In East Yunnan, the Au deposit(ore body)is mainly distributed along the Variscan unconformable contact. Above or under the contact, there are structural open space, tensional fault and slaty cleavage zone, which become the fault subsidence trough and the Au concentration place because of a series of structural deformations and submarine volcanic eruption. The East Yunnan Au metallogenetic zone along Variscan unconformable contact is formed in fine clasolite, claystone, carbonic argillaceous rocks and impure carbonat rocks by ore-bearing hydrothermal fluid, without the stratabound characteristics.