STUDY ON ORE-CONTROLLING ACTION OF GOLD DEPOSITS AND GEOCHEMISTRY OF STABLE ISOTOPE IN THE EAST AREA OF GUANGXI ZHUANG AUTONOMOUS REGION

The gold deposits in this region occured in sandshale of Cambrian epimetamorphic rock series of Shuikou Group.Mineralization can be mainly classified into two types:altered rock type and quartz-vein type. Ore bodies were controlled by two groups of brittle-ductile shear zones trending nearly to east-west and northeast.Sulfur isotopic constitution indicates that sulfur source mainly came fromanatectic syntexis magmatic hytrothermal solution,partly from strata。Hydrogen and oxygen isotopic compositions reflects that the ore-forming solution is mostly magmatic water,mixed with a few of metamorphic and meteorological water.Lead isotopic constitution indicates that lead source is mostly anatectic source,mixed with a few of crustal source material. Gold deposit is characterized by multiple source mineralization. Stable isotopes of sulfur, lead,hydrogen and oxygen etc.and geological feature of ore deposit indicate that the gotd deposit in this district is characterized bymultiple source, multiple origin and multiple stage of mineralization. Ore deposiy origin includs magmatic hydrothermal,metamorphic hydrothermal composite surperimposition,the latter is the principal.