江西省鹅湖金矿化集中区金矿成矿特征研究

景德镇北部地区是继金山金矿化集中区（矿田）后赣东北又一个潜力巨大的金矿找矿远景区之一.而鹅湖金矿化集中区是其中近年来取得连续突破的典型代表之一，相继发现了一系列金矿找矿远景区.集中区内主要发育与韧性剪切带后期叠加的脆性破碎而成的剪切石英脉（团块）带型金矿床（亦称为后韧性剪切带型金矿床）.空间上金矿体严格受韧性剪切带、中元古界地层层位和鹅湖花岗闪长岩复式岩体和煌斑岩的控制，具有较为典型的“三位一体”控矿特征.金矿化普遍具有矿体数量众多、走向延长较为稳定、倾向上延深变化大的特点.矿化极为不均匀，金矿石类型属于贫硫化物金矿石.围岩蚀变有硅化、黄铁矿化、绢云母化、铁白云石化、绿泥石化及碳酸盐化等，而金矿化与前3类蚀变关系密切.大背坞金矿床中黄铁矿δ³⁴S同位素变化范围（-4.9‰~-7.1‰）反映出硫主要来源于双桥山群浅变质海相沉积岩系；δ¹⁸O值、δD_H2O值及δ13C值则反映出成矿流体来源于岩浆水和变质水混合流体源.

METALLOGENESIS OF GOLD DEPOSITS IN E HU CONCENTRATION REGION OF GOLD MINERALIZATION IN JIANGXI PROVINCE

The northern part of Jingdezhen is an area with great potential fo r gold deposit in Northeastern Jiangxi Province. The E hu concentration region of gold mineralization is a representative which has been discovered in recent year s. The genetic type of the gold deposits in the region is of sheared quartz-vei n zone formed in the ductile shear zone with superimposed brittle crash (also na med as post-shear zone quartz vine).The gold deposits are characterized by the united control of ductile shear zones, Proterozoic strata, and E hu granodiorite complex and lamprophyre in space. The gold mineralization commonly distributes in large areas and with a large quantity of ore bodies extending steadily along trends but variously along dips. The ores are of poor-sulphite type. The wallro ck alterations are dominated by silicification, sericitization, pyritization,ank eritization, chloritization and carbonatization. The gold mineralization is clos ely related to the silicification, sericitization and pyritization. The values o f δ34S of the pyrites in the ores of Dabeiwu gold deposit range from -4.9‰to -7.1‰, showing that the sulphur was dominantly derived from the epimetamorphos ed marine sedimentary rock series. The values of the δ18O, δDH2O and δC refle ct that the metallogenic fluid was composed by the mixture of magmatic solution and metamorphic solution.