摘要
湘西层控锑矿床主要分布于雪峰隆起带的中段和东段。有两类产状:一为沿控矿地层自然延伸的缓倾斜整合层状、似层状和透镜状矿床;二为沿控矿地层的断裂构造延展的陡倾斜交错脉状矿床。均共生金。矿床赋存于特定的控矿层位或岩性段,成矿物质主要来自地壳深部,与火山喷溢作用有关,成矿与区域变质作用紧密联系在一起,并严格受构造控制,属复理石一类复理石建造之火山沉积一变质热液类型。铅模式年龄和中K-Ar同位素年龄主要相当于加里东运动早期,与区域控矿构造——雪峰隆起形成时间一致。
The stratabound antimony deposits in western Hunan are mainly distributed in the middle and eastern sectors of Xuefeng upwarping zone and assume two sorts of attitude: one is gently conformable stratiform, stratoid and lenticular deposit stretching naturally along ore-hosting strata; the other is steeplydipping cross veinlike deposit stretching along the fault structure of ore-hosting strata. Both sorts of ore deposits are associated with gold.
The ore deposits occur in specific ore-hosting horizon or lithologic portion, and the metallogenic substances probably came from the depth of the crust and were related to volcanic effusion. The metallogenesis was closely associated with regional metamorphism and strictly controlled by structures, belonging to volcanic deposition-metamorphic hydrothermal(?) type. Their lead model ages and K-Ar isotopic ages correspond mainly to early Caledonian orogeny and are consistent with the formation time of the regional ore-controlling structure——Xuefeng uplift.
出处
《矿床地质》
CAS
CSCD
北大核心
1989年第4期49-60,共12页
Mineral Deposits
