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矿床地质  2009 

新疆东天山地区白山钼矿床的成因分析

Keywords: 地质学,H、O同位素,Re-Os定年,成矿背景,白山钼矿床,东天山

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Abstract:

白山钼矿床位于东天山觉罗塔格构造带的东部,赋矿围岩为下石炭统干墩组的黑云母长英质角岩,矿化石英网脉发育。文章测得含矿石英脉中的石英流体包裹体δ18OSMOW值为9.1‰~10.0‰,平均9.425‰,与石英相平衡的水δ18OH2O值为3.357‰~4.257‰,平均为3.682‰;δDSMOW值为-105‰~-69%,平均-89.25‰。氢氧同位素组成显示白山钼矿床的成矿流体是岩浆水与发生了水岩作用的大气降水的混合热液,含矿流体以岩浆水为主,演化大气降水的加入是成矿物质沉淀的重要因素。测得辉钼矿的Re-Os等时线年龄为(227.7±4.3)Ma(MSWD=0.32),指示白山钼矿床形成于中三叠世。矿床地质特征和地球化学特征指示白山钼矿床是斑岩型矿床,推测成矿物质主要来自于矿体下部的矿化花岗(斑)岩体。此外,作者还探讨了白山钼矿床的成矿背景,认为矿床形成于挤压的构造环境,是受到同时代古特提斯洋闭合的陆内远程效应影响而产生的成岩成矿作用。

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