摘要
碱交代作用的发育对于铀矿床的形成具有极为重要的意义,碱交代岩的特征与时代问题一直是铀地质工作者十分关注的关键问题。对诸广南部201矿床、361矿床、302矿床以及坪下水矿床的碱交代岩进行了室内外观测与鉴定并分别对采集的四个样品采用钾氩法直接测定碱交代岩的钾长石的年龄,测得其年龄分别为:201矿床(93.13±1.42)Ma,361矿床(75.46±1.47)Ma,302矿床(81.96±1.76)Ma,坪下水矿床(51.86±1.36)Ma。测年结果显示碱交代岩年龄比围岩年龄小得多,比矿床附近的中基性岩墙年龄也小,碱交代岩年龄与铀成矿年龄比较接近。
The development of alkali metasomatism is extremely important to the formation of uranium deposits. The features and geochronology of alkali metasomatic rock are the key problems for uranium mineralization which attract uranium geologists. Four samples are collected from Pingxiashui deposit, 201 deposit, 361 deposit, as well as 302 deposit in Zhuguang area to test the K-At geochronology with Potassium feldspar after the detail observation and study. We get the four apparent ages of alkali metasomatic rock, 51.86 ± 1.36Ma of 238 deposit, 93.13 ± 1.42Ma of 201 deposit, 75.46± 1.47Ma of 361 deposit, 81.96 ± 1.76Ma of 302 deposit, respectively. These data show that the age of alkali metasomatic rock is much smaller than the wall rock, smaller than the age of bas- ic-intermediate dike, and is the similar with the age of mineralization.
出处
《东华理工大学学报（自然科学版）》
CAS
2009年第3期209-212,共4页
Journal of East China University of Technology(Natural Science)
基金
江西省教育厅科学技术研究项目"南昌市环境地球化学特征研究"(GJJ08512)
关键词
碱交代岩
钾氩测年法
诸广矿区
铀成矿
alkali metasomatic rock
K-Ar geochronology
Zhuguang area
uranium mineralization
