赣南于都万田花岗岩锆石铀-铅定年及启示  

Wantian Granite,Yudu of Southern Jiangxi: Zircon U-Pb Dating and Its Revelation

作　　者：刘善宝[1] 李鹏[2] 陈振宇[1] 陈郑辉[1] 侯可军[1] 赵正[3] 王成辉[1] 

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]中国地质大学(北京),北京100083 [3]中国地质科学院,北京100037

出　　处：《岩矿测试》2012年第4期724-729,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”(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”课题(Sino Probe 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：南岭是国内外著名的钨、锡及稀土成矿带,以往的研究成果大多认为其成矿作用与中生代的岩浆活动关系密切。相对地,关于加里东期花岗岩与成矿作用关系的研究较少,而实际上加里东期花岗岩的出露面积在该区域仅次于中生代花岗岩,与钨、锡及稀土成矿作用是否存在一定的联系。本文在野外调研的基础上,利用激光剥蚀-电感耦合等离子体质谱(LA-ICP-MS)技术对位于赣南于都万田花岗岩进行了锆石U-Pb定年,同时结合该区域已有的地层和花岗岩成矿元素钨、锡进行了对比分析。结果表明,万田花岗岩体成岩确定年龄为464.9 Ma,由加里东期到燕山期,花岗岩对成矿元素钨、锡富集程度呈逐渐增强的趋势,可能暗示该区的成矿作用具有一定的继承性。The Nanling region, a famous W, Sn and rare-earth metallogenetic belt, is closely related to Mesozoic magmatic activities based on previous research work. There has been little research on the relationship between Caledonian granite and mineralization. The outcrop area of Caledonian granite in this region is slightly less than that of the Mesozoic granite and may be related with mineralization of W, Sn and rare earth elements （ REEs）. Based on field research, Laser Ablation-Muhicollector Inductively Coupled Plasma-Mass Spectrometry （LA-MC-ICPMS） was applied to date the zircon from the Wantian granite. The W/Sn ratios from sediments and granites were compared in this area. The results show that the accurate diagenetic age of the Wantian granite is 464.9 Ma. From the Caledonian to Yanshanian eras, the enrichment of the ore-forming elements W/Sn has gradually increased, which hints that mineralization of the area may have some inheritance.

关 键 词：于都万田花岗岩 锆石U-PB定年 加里东期 成矿作用 继承性 

分 类 号：P597.3[天文地球—地球化学] P612[天文地球—地质学]