中文摘要：

赣西小龙金矿区位于萍乐凹陷带中部竹亭-涧溪深大断裂带附近,矿区内的Au矿化明显受近EW向断裂的控制,与构造活动导致的热液渗透相关。文章在岩相学和地球化学研究的基础上,认为围岩蚀变的特点是以强硅化为主导,伴有轻微的去碳酸盐化和泥化;围岩蚀变是同阶段多期次热液作用的结果,并无明显的分带现象。通过常量元素地球化学特征解析以及蚀变岩质量平衡计算,得出了支持野外和岩相学观察结果的证据,含金矿物电子探针分析结果揭示了该矿区热液活动的成矿作用特征。

英文摘要：

The Xiaolong gold deposit in western Jiangxi Province is located adjacent to the Zhuting-Jianxi fault belt in Pingle depression,and the gold mineralization is controlled by the west-eastern fault obviously and has a consanguineous connection with the hydrothermal fluid penetration.Based on lithology and in site geochemical experiments,the authors hold that the wall rock alteration was dominated by silicification,followed by weak decarbonatization and argillization.According to the theory of mass balance about altered rock and geochemical cha-racteristics of the main elements,the authors obtained enough evidence to afford lithologic conclusions.On such a basis,the authors used the electron microprobe analysis of gold minerals to detect the characteristics of hydrothermal fluid migration.