湖南江东湾矿区2号金锑矿脉(体)特征及控矿因素探讨

江东湾矿区处于扬子准地台与华南褶皱系两个Ⅰ级大地构造单元结合部的南东侧,雪峰山边缘加里东褶皱带中段内缘,该褶皱带为湖南省金锑矿重点成矿区。区内2号金锑矿脉浅部厚度稳定,品位高,中深部资源潜力大,总结该矿脉特征,分析矿床控矿因素,对指导江东湾矿区开展新一轮中深部找矿工作具有重要意义。

湘西江东湾金锑矿床流体包裹体及矿床形成机制研究

江东湾金锑矿是湘西锑金砷成矿带内的重要矿床。在详细的岩相学基础上,对该矿床石英中流体包裹体进行显微测温学研究,结果显示,石英中流体包裹体以气液两相包裹体为主,成矿温度163-290℃,包裹体盐度ωNa Cl为1.73%-15.3%,属于中-低温度、中-低盐度流体体系,流体密度为0.81-1.01 g/cm^3,压力13-40 MPa,成矿深度为0.5-1.4 km;包裹体均一温度有180-240、250-280℃2个峰值区间,指示成矿作用具多期性;流体包裹体研究表明,该矿床形成机制以流体混合为主。

湘西江东湾锑金矿床成矿地质特征、控矿因素及深部找矿远景分析

江东湾锑金矿床位于雪峰造山带中段,产在区域主干断裂控制的断块上升隆起区。矿体呈脉状、薄板状赋存于新元古界板溪群五强溪组上段浅变质岩系中。通过矿床成矿地质特征、控矿因素、垂向分带、找矿前景等方面的综合分析,认为江东湾锑金矿床是湘西龙王江金矿集区最具有找矿潜力的矿床。矿床浅部以锑或锑金为主,深部以金为主,且越向深部,金矿化越强,隐伏矿脉增多,深部找矿空间大,具有中型金矿床的资源潜力。

Numerical Study of the Donghai Dam Impact on the Hydrodynamic Environment of Zhanjiang Bay

In this paper, the Finite Volume Coastal Ocean Model （FVCOM） was employed and configured for 3 dimensional numerical simulations of tide and tidal current based on the field observations in Zhanjiang Bay. The model＇s results agree well with the field observed data. Based on the well validated model, the hydrodynamic fields of zhanjiang bay area were calculated both before the Donghai Dam constructing and after that. Compared the tidal level, current field, tidal capacity and water exchange ratio before the construction of Dohai dam with those after construction of the dam, we analyzed and get some conclusions of effects of Donghai Dam on Hydrodynamic environment of the Zhanjiang Bay.

3成矿预测及找矿远景区

３．１成矿预测原则及依据（１）限于研究的范围和对象，成矿预测重点放在雪峰弧形构造带的中、西段，而又以成矿条件相对较好的中段（即益阳—怀化一段）为主；预测对象则是以与剪切带有关的金、锑矿为重点。（２）由于该带地质工作和研究程度均较高，先后有多个勘查、科...