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矿床地质  2005 

四川冕宁木落寨稀土矿床稳定同位素研究及其意义

Keywords: 地球化学,稀土矿床,稳定同位素,幔源,木落寨,四川冕宁

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Abstract:

木落寨稀土矿床在构造上位于西南新生代陆内造山带的锦屏山北缘。文章通过对木落寨2个坑道的矿石样品的C、H、O、S同位素组成的系统研究,探讨了木落寨稀土矿床成矿流体的来源及其与深部过程的关系。研究表明,石英和萤石的δ13CV_PDB值为-2.5‰~-9.0‰,方解石、石英、萤石和氟碳铈矿的δDV_SMOW值为-63‰~-87‰,萤石和石英的δ18O水V_SMOW为10.0‰~15.5‰,重晶石和方铅矿的δ34SV_CDT值分别为0.1‰~2.2‰和-8.6‰~-9.3,方解石的δ13CV_PDB和δ18OV_SMOW分别为-6.6‰~-6.8‰和8.4‰~9.1‰。所有这些数据均显示木落寨稀土矿床在成矿过程中有大量地幔流体的参与,表明其成矿作用与深部过程有关。

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