云南哀牢山变质流体特征

Characters of metamorphic fluid of Ailaoshan, Yunnan.

对云南哀牢山的变质岩、混合岩及脉岩中包裹体的化学成分及碳、氢、氧进行研究 ,结果表明 ,哀牢山变质流体有多种来源 ,流体成分复杂。有互不混溶的流体水、CO2 、有机物。水主要来源于古海水和大气降水 ,少部分来源于深部岩浆水 ;有机质来源于沉积岩生物质 ;CO2 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 ,参与了本区岩石的改造 。

The paper has investigated chemical components and isotopes: carbon, hydrogen and oxygen of inclusions in metamorphites, migmatites and dike rocks from Ailaoshan, Yunnan province. The results indicate that metamorphic fluids in them possess many sources and complex components: immiscible water, carbon dioxide and organic material, which can not be mixed up with each other. The water mostly comes from ancient sea and atmosphere but a little from magma; while organic material from ancient life form. The majority of carbon dioxide is originated in carbonate rock while the minority in organic material. All these fluids are drived to be active by tectogenesis. Then they not only become the transiting medium of forming ore material and take part in rebuilding the rocks, but also are the important source of pegmatite fluid in the region.