云南哀牢山伟晶岩流体来源研究

Study on Source of Pegmatite Fluid in Ailaoshan, Yunnan

云南哀牢山的变质岩、混合岩、伟晶岩及石英脉中包裹体的化学成分及碳、氢、氧同位素进行研究表明 ,伟晶岩流体成分有水、二氧化碳、一氧化碳、有机物等 ,且与变质流体同源。水主要来源于古海水和大气降水 ,有机质来源于沉积岩中生物质 ;二氧化碳多数来源于碳酸盐岩 ,少数来源于有机质的氧化分解。这些流体受构造运动的驱动而活化迁移 ,成为成矿物质的搬运介质 ,参与了对岩石的改造 ,是本区伟晶岩流体的重要来源。

The paper has investigated chemical components and isotopes: carbon, hydrogen and oxygen of inclusions in metamorphite, chorismite, pegmatite and quartz dike rock from Ailaoshan, Yunnan Province. The results indicate that pegmatite fluid possesses the same source as metamorphite fluid. Their components consist of water, carbon dioxide, carbon monoxide and organic material. The water mostly comes from ancient sea and atmosphere while organic material from ancient life-form. The majority of carbon dioxide is originated from carbonate rock while the minority from organic material. All these fluids are driven to turn active by tectogenesis. Then they not only become the transportation medium of forming-ore material but also take part in rebuilding the rocks.All of them are the important sources of pegmatite fluid in the region.