赣南加里东期阳埠(垇子下)岩体的锆石年龄、构造背景及含矿性评价  

Zircon U-Pb Dating,Tectonic Setting and Ore-bearing Properties Evaluation of the Caledonian Yangbu Pluton in South Jiangxi

作　　者：赵芝[1] 陈振宇[1] 陈郑辉[1] 侯可军[1] 赵正[1] 许建祥[2] 张家菁[2] 曾载淋[3] 

机构地区：[1]国土资源部成矿作用与资源评价重点实验室,中国地质科学院矿产资源研究所,北京100037 [2]江西省国土资源厅,江西南昌330000 [3]江西省地质矿产勘查开发局赣南地质调查大队,江西赣州341000

出　　处：《岩矿测试》2012年第3期530-535,共6页Rock and Mineral Analysis

基　　金：中国地质大调查项目"南岭地区岩浆岩成矿专属性研究"(1212011120989);"我国重要矿产和区域成矿规律研究"项目(1212010633903);国家深部探测技术与实验研究专项"南岭成矿带地壳岩浆系统结构探测实验"(SinoProbe 0301);"南岭于都-赣县矿集区立体探测技术与深部成矿预测示范"课题(201011048)

摘　　要：阳埠岩体是赣南著名的含稀土岩体之一,但研究程度低,缺乏精确的同位素年代学资料。文章对阳埠岩体风化壳的锆石样品进行了激光剥蚀-多接收器电感耦合等离子体质谱(LA-MC-ICPMS)U-Pb定年,获得206Pb/238U加权平均年龄为(461.1±1.3)Ma,说明该岩体形成于中奥陶世。区域上阳埠岩体与武功山山庄岩体(461 Ma)、赣南上犹岩体(464 Ma)、云开大山花岗岩(465～467 Ma)等为同时代岩体,属华南加里东晚期第一次岩浆活动峰期产物,暗示华南加里东期褶皱造山运动的开始。结合江西省加里东期花岗岩的地球化学资料,发现多数岩体的稀土总量较高,具备成矿母岩的首要条件。今后应对南岭地区加里东期花岗岩含矿性评价及找矿工作给予重视。The Yangbu pluton is one of the famous Rare earth element granitoid plutons in South Jiangxi, but it lacks precise isotopic chronological data. In this paper, we present research for the zircon U-Pb chronology of the Yangbu pluton by using Laser Ablation-Multicollector Inductively Coupled Plasma-Mass Spectrometry （LA-MC-ICPMS）. The yield weighted average ^206Pb/^238U age is （461.1 ± 1.3 ） Ma, which illustrates that the Yangbu pluton formed in the Middle Ordovician period. Granitic plutons, Yangbu, Shanzhuang （in the Wugong Mountains）, Shangyou （in South Jiangxi） and Yunkai Mountain, have the same zircon U-Pb ages, which are products of the first peak period of magmatism during the Late Caledonian period in southern China, indicating a new cycle of folding and orogeny. Geochemical dates of Caledonian granitoids in Jiangxi Province show that most of them with higher ∑ REEs content have a major necessary condition of mineralization mother rock of weathered-crust type REEs deposits. Therefore, they should be considered during ore-bearing properties evaluation and ore prospecting.

关 键 词：阳埠岩体 锆石U—Pb年龄 造山运动 稀土矿 赣南 

分 类 号：P59[天文地球—地球化学] O657.63[天文地球—地质学]