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江西彭山锡(铅锌)多金属矿田构造地质特征及成矿机理探讨

, PP. 297-305

Keywords: 控矿构造,隐伏岩体,矿化分带,锡铅锌多金属矿床,江西彭山

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Abstract:

江西彭山锡(铅锌)多金属矿田位于长江中下游多金属成矿带中的九瑞地区。彭山隐伏钙碱性花岗岩体侵位为锡(铅锌)多金属矿的形成提供了热动力及成矿物质来源。自晋宁期形成的长期活动的基底深断裂和由彭山岩体底辟侵位形成的穹窿构造,以及由此派生的次级断裂带,诸如环形滑脱断裂、顶脱断裂和节理裂隙,都为含矿热液的运移和矿体就位提供了空间。形成彭山岩体(DI>90)的岩浆经历了较为充分的分异,在岩浆热液对流系统和地下水对流系统的双重作用下,含矿热液流体的成分随温度降低而改变,导致6个阶段的成矿作用。各阶段的矿物组合随温度而变化,在空间上有一定的叠加,在萤石-硅酸锡阶段,还发现了马来亚石。各类矿产在空间上的分布呈环状,即由岩体中心向外围依次出现内侧的高温As-Sn带、中间的Sn-Pb和Pb-Zn-Ag带和外围的低温萤石带。文中还以锡为例,详细讨论了锡在黑云母与热液流体之间的迁移及其矿化过程。

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