赣中变质岩带变质流体地球化学特征与流体来源  

GEOCHEMISTRY AND ORIGIN OF METAMORPHIC FLUIDS FROM THE METAMORPHIC BELTS IN CENTRAL JIANGXI PROVINCE

作　　者：胡恭任[1] 刘丛强[1] 陈培荣[2] 唐红峰[1] 

机构地区：[1]中国科学院地球化学研究所 [2]南京大学内生金属矿床成矿机制研究国家重点实验室,江苏南京210093

出　　处：《矿物学报》2005年第3期268-274,共7页Acta Mineralogica Sinica

基　　金：国家自然科学基金(40272038);科技部攀登计划预选项目(95-预-39);南京大学内生金属矿床成矿机制研究国家重点实验室开放基金

摘　　要：对赣中变质岩带的变质岩、混合岩及其中的长英质脉体包裹体的化学成分和C、H、O同位素进行了研究。结果表明:赣中变质岩带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;有机物来源于沉积岩成岩物质;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,成为成矿物质的运移介质,参与了本区岩石的变质改造,是形成本区长英质变质分异脉体、混合岩、混合花岗岩及伟晶岩的重要流体来源。The paper deals with the chemical composition and isotopes： carbon, hydrogen and oxygen of inclusions in metamorphites, migmatites and felsic veins from the metamorphic belts in central Jiangxi province. The results indicated that metamorphic fluids in them are characterized by multi-source and complex composition： immiscible water, carbon dioxide and organic matter, which cannot be mixed up with each other. The water mostly comes from ancient seawater and meteoric water, but a little from magma, while organic matter from ancient diagenic material. The majority of carbon dioxide comes from carbonate rocks while the minority from organic matter. All these fluids are drived to be active by tectogenesis. Then, they not only become the transporting medium of forming-ore material and take part in rebuilding the rocks, but also are the important source of migmatite ,migma granite ,felsic mineral and pegmatite fluid in the region.

关 键 词：变质岩 混合岩 流体 包裹体 C、H、O同位素 赣中变质岩带 

分 类 号：P588.3[天文地球—岩石学] P599[天文地球—地质学]