摘要
在朱溪钨铜矿床中,首次发现有闪长玢岩赋存于蚀变花岗岩中,为了解闪长玢岩对成矿是否有影响,对闪长玢岩开展岩相学、地球化学、年代学研究。结果显示闪长玢岩锆石U-Pb年龄为(162.7±1.4)Ma,岩石属于钙碱性系列,具有过铝质特征;轻重稀土分异明显,具Eu负异常;微量元素原始地幔标准化曲线显示Ba、U、K、Pb、Sr正异常,Nb、Ta、P、Ti负异常,具岛弧岩浆特征。岩石表现出高Sr、低Y、低Yb等特征,具埃达克(质)岩特征。结合前人成果,研究认为约162 Ma矿区发生的壳幔相互作用事件为朱溪矿床的Cu矿化贡献了一定的作用,该期岩浆事件可能使得铜先富集,而后受区域构造作用,钨活化迁移富集的同时伴随着大量的铜活化迁移,两者在合适的物理化学条件下沉淀成矿,形成“钨铜共生”现象。
In the Zhuxi tungsten-copper deposit,diorite porphyrite was found in altered granite for the first time.In order to understand whether diorite porphyrite has an influence on the mineralization,the lithofacies,geochemistry,Chronological research.The test results show that the U-Pb age of the diorite porphyry zircon is(162.7±1.4)Ma.The rock belongs to the calc-alkaline series and has the characteristics of peraluminum;the light and heavy rare earths are distinctly different and have a negative Eu anomaly;The standardized curve of the original mantle shows positive anomalies of Ba,U,K,Pb,and Sr,and negative anomalies of Nb,Ta,P,and Ti,with island arc magma characteristics.The rock exhibits the characteristics of high Sr,low Y,and low Yb,and has the characteristics of adakite.Combining the test results with previous research results,it is believed that the crust-mantle interaction event that occurred in the 162 Ma mining area contributed to the Cu mineralization of the Zhuxi deposit.The magmatic event of this period may cause copper to be enriched first,and then affected by regional structure.The role of tungsten activation migration enrichment,accompanied by a large amount of copper activation migration,the two precipitate and mineralize under appropriate physical and chemical conditions,forming a"tungsten copper symbiosis"phenomenon.
作者
饶建锋
欧阳永棚
陈祺
魏锦
陈国华
曾祥辉
RAO Jianfeng;OUYANG Yongpeng;CHEN Qi;WEI Jin;CHEN Guohua;ZENG Xianghui(No.912 Geological Surveying Team,Jiangxi Bureau of Geology and Mineral Exploration and Development,Yingtan 335001,Jiangxi,China)
出处
《中国钨业》
CAS
2020年第5期43-52,共10页
China Tungsten Industry
基金
江西省科学技术厅国家科技奖后备项目培育计划(20203AEI91004)
中国地调局地质调查(12120113065300)
江西省地质勘查基金项目(20150013,20200022)
关键词
闪长玢岩
埃达克岩
钨铜共生
朱溪矿区
diorite porphyrite
adak rock
tungsten copper symbiosis
Zhuxi deposite
