Lead isotopic characteristics of the Xikuangshan superlarge Sb deposit and their geological implications

THE Xikuangshan Sb ore deposit located in the central part of Hunan Province, China, is the only superlarge Sb deposit so far reported in the world, and is titled as the antimony capital of the world. The strataexposed in the Xikuangshan orefield are only Devonian to Permian Series. Except for a lamprophyre dykeseen in the eastern part, no igneous rocks outcrop within or around the mining district. Orebodies occurdominantly in the Devonian Shetianqiao Formation （D3s） and subordinately in the Qiziqiao Formation（D2q）. The orebodies usually appear stratiform and stratoid in shape and are rather constant in boththickness and grade. The compositions of ores are simple. The metallic mineral is stibnite and the gangueminerals include quartz and calcite, with minor amounts of fluorite, barite and secondary gypsum. Theores are dominated by the quartz-stibnite type, the quartz-calcite-stibnite type and the

锡矿山锑矿控矿构造——“三层楼”模式及其意义

锡矿山矿区内不同地段或不同深度，由于构造作用力的差异，导致形成的控矿构造亦有差异．在深部，主要是断裂及附近的微角砾岩化带和裂隙带控制矿体；在中部，主要是背斜和断层综合控矿；而浅部主要是背斜构造控矿．这种控矿构造的类型随深度的变化可分为３层，概括成“三层楼”控矿模式，以此模式为指导，对矿区内外围进行了成矿预测，得出北部区的背斜分布区和北矿深部等是有望找矿区段的结论．

锡矿山煌斑岩成因探讨

湖南冷水江锡矿山是已知的世界上最大的锑矿床.区内发育的煌斑岩脉也是很多人关注的对象,然而对于煌斑岩脉的成因却存在着争议.作者从地球化学角度探讨了煌斑岩的成因,结果表明锡矿山煌斑岩来源于地幔并受到地壳物质的混染.

湖南锡矿山超大型锑矿床围岩蚀变元素迁移特征及定量计算研究

湖南锡矿山锑矿床是目前世界上已发现的最大的锑矿床,其硅化非常发育且与矿化关系密切,根据硅化蚀变程度的强弱,从围岩到矿石大致划分为4个带:灰岩→弱硅化灰岩→强硅化灰岩→矿石。为揭示锡矿山锑矿的成矿过程及成矿流体信息,利用Isocon标准化方法,以Al_2O_3为惰性组分,对各蚀变带围岩及矿石的主、微量元素进行质量平衡计算。结果表明,热液蚀变过程中,Si、Sb、Li和Bi等大量迁入,而Ca、Mg、Na和大离子亲石元素Sr、Ba、Rb等大量迁出;成矿热液呈酸性并富硅,其中Hg、As、Au、Tl等元素含量极低,这可能是导致锡矿山锑矿床矿种单一的原因之一。稀土元素除Eu外,其他元素未发生明显的活化迁移,水岩反应并未影响原岩的稀土元素配分模式;蚀变岩及矿石中的Eu负异常可能表明成矿过程是在相对还原的环境下进行的。