岩矿测试2012，Vol.31Issue(3)：518-524,7.
赣东南大富足成铀岩体锆石U - Pb定年和构造背景与含矿性
Zircon U-Pb Age, Tectonic Setting and Ore Potentiality of the Dafuzu (or Fucheng) Uranium-bearing Rock Mass in the Southeastern Jiangxi Province
摘要
Abstract
Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China) The Dafuzu rock mass is located at the junction of Jiangxi province and Fujian province, and is closely related to uranium mineralization. In this paper, based on field surveys, we investigate the rock forming time of medium-coarse porphyritic biotite monzonitic granite and fine-grained biotite granite by Laser Ablation-Multicollector Inductively Coupled Plasma-Mass Spectrometry (LA-MC-ICPMS) zircon U-Pb dating, and determine the age as (233.4±1.6) Ma with MSWD =0.30 (n = 13) and (233.1 ±1.6) Ma with MSWD = 0.48 (n = l2), respectively. These ages show that the Dafuzu rock mass belongs to products of the first stage of Indosinian granitic magmatic activity. Combining previous studies, Dafuzu granite rich in Al-rich minerals such as biotite and muscovite and characterized by relatively low SiO2 and high Al2O3, peraluminous (A/CNK = 1. 12 -1.36), suggest that the Dafuzu granite was probably formed in the syn-orogenic tectonic setting and may be derived from sedimentary rocks consisting of ancient crustal materials. In addition, the Dafuzu rock mass is characterized as having a high U and Th content with a leaching rate of mobile uranium and independent of micro-grained uraninites, suggesting a great uranium metallogenetic potential.关键词
大富足花岗岩/LA-MC-ICPMS锆石U-Pb定年/印支期/铀成矿Key words
Dafuzu granite/ LA-MC-ICPMS zircon U-Pb dating/ Indosinian/ uranium mineralization分类
天文与地球科学引用本文复制引用
黄凡,侯可军,陈郑辉,陈振宇,赵正..赣东南大富足成铀岩体锆石U - Pb定年和构造背景与含矿性[J].岩矿测试,2012,31(3):518-524,7.基金项目
中国地质大调查项目“南岭地区岩浆岩成矿专属性研究”(1212011120989) （1212011120989）
“我国重要矿产和区域成矿规律研究”课题(1212010633903) （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”(SinoProbe0301) （SinoProbe0301）
“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) （201011048）
