粤东新寮岽矿区成矿闪长岩类SHRIMP锆石U-Pb年龄、地球化学特征及地质意义  

SHRIMP zircon U-Pb dating and geochemistry of metallogenic dioritoids in the Xinliaodong copper-polymetallic ore district,eastern Guangdong Province,and their geological significance

作　　者：范飞鹏[1] 肖惠良[1] 陈乐柱[1] 李海立[1] 康丛轩[1] 刘建雄 邓中林 李少斌 林耿伟 周霞 FAN Fei-peng;XIAO Hui-liang;CHEN Le-zhu;LI Hai-li;Kang Cong-xuan;LIU Jian-xiong;DENG Zhong-lin;LI Shao-bin;LIN Geng-wei;ZHOU Xia(Nanjing Center,China Geological Survey,Nanjing 210016,China;Foshan Geological Bureau of Guangdong Province,Guangzhou 528000,China;340.2 Geological Party of Guangdong Province,Shantou 515300,China)

机构地区：[1]中国地质调查局南京地质调查中心,南京210016 [2]广东省佛山地质局,佛山528000 [3]广东省第二地质大队,汕头515000

出　　处：《华东地质》2018年第4期279-289,共11页East China Geology

基　　金：中国地质调查局"广东厚婆坳铜锡多金属矿整装勘查区找矿预测模型构建与找矿预测研究(编号:12120114015701)"和"武夷山成矿带龙泉-上杭地区地质矿产调查(编号:DD20160037)"项目联合资助

摘　　要：新寮岽矿区位于东南沿海火山-侵入岩带西南端,是粤东地区新发现的铜多金属矿床之一。对该矿区与铜矿化关系密切的闪长斑岩和石英闪长岩进行矿物岩石学、SHRIMP锆石U-Pb定年和地球化学特征研究。结果表明:闪长斑岩和石英闪长岩SHRIMP锆石U-Pb年龄分别为160.2±1.4 Ma和161.9±1.1 Ma,形成于晚侏罗世,与粤东地区晚侏罗世(161～145Ma)锡铜成矿期一致;矿区内各类岩石中均见角闪石、榍石和磁铁矿等;闪长斑岩属于准铝质高钾钙碱性系列,石英闪长岩属于准铝质高钾钙碱性系列;闪长斑岩和石英闪长岩富集Rb、U、Ce、Zr、Hf、Y和Nd,亏损K、Sr、Nb、Ta、P和Ti,稀土元素配分曲线呈右倾型,具有明显的中等负Eu异常,轻、重稀土元素分异明显,均具有I型花岗岩的特征;部分石英闪长岩和矿化石英闪长岩受成矿作用影响,化学成分发生明显变化。The Xinliaodong copper polymetallic ore district, located in the southwestern volcanic intru sive belt of coastal southeast China, is a newly discovered deposit in eastern Guangdong Province. The dio rite porphyry and quartz diorite closely related to copper mineralization were studied using mineral miner alogy, SHRIMP zircon U Pb dating and lithogeochemical methods. This study yielded a SHRIMP zircon U Pb age of 1G0.2±1.4 Ma and 161.9±1.1 Ma for diorite porphyry and quartz diorite, respectively, sug gesting that they formed in late Jurassic. This is consistent with tin copper mineralization period （late Ju rassic, 161-145 Ma） in eastern Guangdong Province. All the rocks in the mining area are found to corn monly contain amphibole, sphene and magnetite. Diorite porphyry belongs to metaluminous, high K calc alkaline series. Diorite porphyry and quartz diorite are enriched in Rb, U, Ce, Zr, Hf, Y and Nd, delepted in K, St, Nb, Ta, P and Ti. Right dipping REE distribution pattern, distinct fractionation between LREE and HREE, and mean negative Eu anomalies are characteristic of I type granitoid. Some quartz diorite and mineralized quartz diorite were altered chemically by mineralization.

关 键 词：SHRIMP锆石U-PB定年 地球化学特征 成矿闪长岩 新寮岽铜多金属矿 粤东 

分 类 号：P588.122[天文地球—岩石学]