【摘要】 江南造山带中段湘东北地区处于扬子地块与华夏地块的过渡地带。江南造山带的演化导致湘东北地区金及金多金属矿床构造变形的时空差异显著,由此决定了金及金多金属矿资源赋存的复杂性。文章通过对湘东北区域地质构造特征、控矿构造特征、典型矿床地质特征、区域构造演化及其与成矿作用响应的综合分析,认为:(1)区域构造背景是矿田构造发育的基础,印支期以来的挤压应力场是湘东北地区构造格局形成的关键,燕山期的伸展作用使则该区成矿物质发生富集成矿;(2)湘东北地区矿田构造主要是由NE(NNE)向构造为主导的复合改造EW及近EW向构造组成,多期次构造活动形成了NW褶皱和NE向断裂体系,以及"两隆三盆"为特征的含矿构造格局;(3)湘东北地区矿床构造以韧性剪切控矿构造样式为主;(4)矿体赋存状态与构造时空演化及构造组合密切相关,构造变形叠加、改造及其互相制约,共同控制了矿产资源的现今赋存状况。最后,按照矿床地质特征、结合区域构造演化,提出了江南造山带中段湘东北地区金及金多金属矿床成矿模式图。更多还原

【Abstract】 The Jiangnan Orogen has been generally considered as a transitional zone between the Yangtze Block and the Cathaysia Block. The evolution of Jiangnan Orogen led to the significant difference of the space-time of the tectonic deformation,which determines the complexity of the gold and gold-polymetallic mineral resources. By the comprehensive analysis of regional geological characteristics,ore-controlling structural features,geological features of the typical deposits,regional tectonic evolution and associated metallogeny,this paper holds that:(1) regional tectonic background was the basis for development of ore field structure,the key to form the structure pattern in NE Hunan Province,South China,was the compressive stress field in Indosinian and the extension in Yanshanian made the area into a mineral-rich mineralization occurrence;(2) the ore field structure dominated by NE( NNE) led to the construction of complex EW-and near EW-trending structures,multi-stage tectonic activities created the district,which formed NW-trending folds and NE-trending fault system and a structural framework that features "two uplifts,three basins"was presented;(3) the main ore-controlling structure style is the ductile shear;(4) the state of ore body was closely related to the evolution and composition of tectonics and the current occurrence status of the mineral resources were limited by the deformation and superimposed on transformation. Finally,according to the geological characteristics of the deposits,combined with regional tectonic evolution,we have proposed the metallogenic model of Au and Au-polymetallic mineralization in the Jiangnan Orogen domain in the Hunan.更多还原