岩矿测试2012，Vol.31Issue(4)：717-723,7.
江西赣县韩坊岩体的成岩时代及成矿条件分析
The Dating and Analysis of Ore-forming Conditions for Hanfang Granite Intrusions in Ganxian,Jiangxi Province
摘要
Abstract
Zircons collected from Hanfang intrusions in Ganxian, Jiangxi province, whose weathered crust produced many rare earth element ( REE) deposits, have been dated by using Laser Ablation-Multicollector Inductively Coupled Plasma-Mass Spectrometry ( LA-MC-ICPMS) and are presented here. The dating results from typical magmatic zircons with good shape and oscillatory zoning show that the coarse-grained biotite monzonitic granite intruded in the Caledonian era, during the convergence between Yangtse block and Cathaysia block, and the finegrained biotite monzonitic granite intruded in the early Yanshan epoch as the results of lithospheric thinning and delamination during subduction of the old Pacific plate to the South China Plate. The granite intrusions formed in the Yanshan epoch have a close relationship with large scale mineralization of W, Sn in the Nanling district, while the intrusions formed in the Caledonian era have a significant contribution to the formation of ion adsorption type REE deposits. The intrusions in the Caledonian era host REE-rich accessory minerals, such as orthite, zircon and fluorite. The fractures of the intrusions were well developed as a result of a few tectonic events. The bad weathering was attributed to the hot and rainy climate in this region. Therefore, the intrusions in the Caledonian era tend to produce ion adsorption type REE deposits for the reasons previously mentioned.关键词
韩坊岩体/LA-MC-ICPMS U-Pb定年/加里东期/离子吸附型稀土矿床Key words
Hanfang granite intrusion/ LA-MC-ICPMS U-Pb dating/ Caledonian/ ion adsorption type REE deposit分类
天文与地球科学引用本文复制引用
李建康,陈振宇,陈郑辉,侯可军,赵正..江西赣县韩坊岩体的成岩时代及成矿条件分析[J].岩矿测试,2012,31(4):717-723,7.基金项目
中国博士后科学基金和特别资助(2008044018,200902580) （2008044018,200902580）
中国地质大调查项目(1212011120989,1212010633903) （1212011120989,1212010633903）
国家深部探测技术与实验研究专项(SinoProbe0301,SinoProbe0303) （SinoProbe0301,SinoProbe0303）
中央级公益性科研院所基本科研业务费专项资金(K1001) （K1001）
