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矿床地质  2005 

浙江洋滨斑岩锡矿成矿流体特征

Keywords: 地球化学,成矿流体,流体沸腾,成矿机制,斑岩锡矿,浙江洋滨

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Abstract:

在岩石地球化学、同位素地球化学的研究基础上,通过对浙江洋滨斑岩锡矿成矿流体的一系列研究,从流体角度探讨了洋滨斑岩锡矿的成矿机理。本区沸腾流体包裹体的形成压力约为25~40MPa,主要成矿深度约为0.76~1.22km,说明含矿岩浆是在浅成_超浅成环境下侵位的,由于压力突然降低及有少量大气降水混入,导致流体沸腾,加速矿质沉淀。流体包裹体中多种子矿物的发现及各相成分分析结果充分表明当时有多种不混溶流体被同时捕获,且不混溶的岩浆_流体富含成矿元素,进一步证实了洋滨斑岩锡矿属岩浆_大气降水混合型矿床,成矿物质主要来源于花岗斑岩。

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