湘中区域古流体的地球化学特征

成矿流体是区域流体场与矿源层或含矿建造相互作用的地球化学演化产物。区域古流体的研究对于认识和了解成矿流体以及矿床成因具有重要意义，应用地球化学方法对湘中区域古流的系统研究结果表明：湘中区域古流体是一种来源于大气降水的低温，低盐度、偏碱性的还原性地质流体，这种区域古流体与湘中成矿期（中生代）的成矿流体极为相似，成矿流体是由区域古流体演化而来。

GEOCHEMICAL CHARACTERISTICS OF REGIONAL PALEOFLUID OF CENTRAL HUNAN

Ore forming fluid evolved from regional fluid.Regional fluid leaches source bed or ore bearing formation and forms ore forming fluid.So the research on regional fluid for recognizing ore forming fluid and metallogeny not only has theoretical significance,but also has practical value in exploration of ore deposits.Using the method of geochemistry,the paper systematically studies regional paleofluid of central Hunan.The study result shows that the regional paleofluid in central Hunan,originated from meteoric water and is lower in temperature,salinity and weak alkali reduction.The physicochemical property of regional paleofluid is similar to typical ore forming fluid of mineralization epoch of central Hunan(Mesozoic era)and the typical ore forming fluid evolved from it.