南岭东段淋洋岩体的锆石铀-铅定年及其构造和成矿意义  

U-Pb Dating of Zircons from the Linyang Granitic Intrusion in the Nanling Metallogenic Belt and Its Significance to Tectonics and Metallization

作　　者：孙艳[1,2] 李建康[2] 陈振宇[2] 陈郑辉[2] 侯可军[2] 赵正[3] 

机构地区：[1]中国地质大学(北京),北京100083 [2]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 [3]中国地质科学院,北京100037

出　　处：《岩矿测试》2012年第4期730-735,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(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);我国三稀金属资源战略调查“我国三稀资源战略调查及综合”项目(1212011220803)

摘　　要：南岭东段淋洋岩体研究程度低,成岩时代众说纷纭,其主要由中细-中粗粒斑状黑云(二云)花岗岩组成。本研究运用激光剥蚀-多接收器电感耦合等离子体质谱(LA-MC-ICPMS)对岩体进行锆石U-Pb精确测年。定年结果表明,淋洋岩体某一断层附近花岗岩的成岩年龄为(233.1±1.3)Ma(MSWD=1.11),下村矿点附近岩体的成岩年龄为(243.3±2.1)Ma(MSWD=2.3),二者均属于印支期,说明淋洋岩体形成于印支期陆陆碰撞和地壳抬升和增厚的构造环境,暗示淋洋岩体可能存在印支期或燕山期的成矿作用,具有进一步研究的价值。The Linyang granitic intrusion is located in the east segment of the Nanling metallogcnic belt. Due to a lack of research, it is not well known for its emplacement age. In this paper, the zircon U-Pb dating results from the Linyang granite through Laser Ablation-Multicollector Inductively Coupled Plasma-Mass Spectrometpy （LA-MC- ICPMS） show that the granite near a fault and Xiacun ore spot intrude at （233.1±1.3） Ma and （243.3±2.1 ） Ma, respectively. Therefore, the Linyang granite formed in the Indo-Chinese epoch during the continent-continent collision together with uplifting and thickening of the earth＇s crust, and further research is necessary for the potential metallization of the Linyang intrusion that possibly occurred in the Indo-Chinese epoch or Yanshan epoch.

关 键 词：淋洋岩体 下村矿点 锆石LA-MC-ICPMSU-Pb定年 成岩时代 印支期 

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