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赣南兴国县留龙金矿田井头复式岩体由主体花岗闪长岩和补体闪长岩组成,其中闪长岩主要由角闪石和斜长石组成,而不是英安岩或粗玄岩,其主体和补体的稀土元素球粒陨石标准化配分曲线相互平行,属于轻稀土元素富集型,Eu有弱的亏损,两者来源于同一个岩浆房;并发现了具有金矿化特征的绿泥石化蚀变闪长岩,是一个新的地质找矿方向;锆石SHRIMP U-Pb同位素年代学研究表明,井头复式岩体的主体花岗闪长岩的成岩年龄为(162.6±2.6)Ma(MSWD=0.75),具有金矿化特征的绿泥石化蚀变闪长岩的成岩年龄为(156.6±1.7)Ma(MSWD=0.46)。区域地质及井头复式岩体的地球化学分析显示,该区金矿的形成与中晚侏罗世的浅成相中酸性、中性或基性岩浆岩密切相关,与赣南地区燕山早期钨锡矿的成矿时代同步,在同一构造背景下形成,两者应属于同一成矿系列。
The wellhead complex rock mass of the Liulong gold deposit in Xingguo County, southern Jiangxi Province consists of the main granodiorite and the complement diorite, in which the diorite is mainly composed of amphibole and plagioclase instead of the dacite . The normalized distribution patterns of rare earth element chondrules in its main body and complement are parallel to each other and belong to LREE enrichment type and Eu is weakly depleted, both of which originate from the same magmatic chamber. The green mineralization with green mineralization Mudstone alteration diorite is a new geology prospecting direction. The zircon SHRIMP U-Pb isotopic chronological study shows that the diagenetic age of the main granodiorite in the well head complex rock mass is (162.6 ± 2.6) Ma (MSWD = 0.75). The diagenetic age of chloritized altered diorite with gold mineralization is (156.6 ± 1.7) Ma (MSWD = 0.46). Geochemical analysis of regional geology and wellhead complex rock mass shows that the gold deposits in the area are closely related to the acidic, neutral or basic magmatic rocks in the mid-late Jurassic, and are similar to the early Yanshanian tungsten The tin mineralization time synchronization, formed under the same tectonic setting, both should belong to the same metallogenic series.