欢迎访问现代地质!

现代地质 ›› 2022, Vol. 36 ›› Issue (06): 1465-1474.DOI: 10.19657/j.geoscience.1000-8527.2022.06.02

• 矿床学 • 上一篇    下一篇

四川冕西岩体岩石地球化学特征及铀成矿条件分析

王战永1(), 隆兆笃1(), 解波1, 孙悦2, 李巨初3, 向杰1, 范永宏1   

  1. 1.核工业二八○研究所,四川 广汉 618300
    2.中核赣州金瑞铀业有限公司,江西 赣州 341000
    3.成都理工大学 核技术与自动化工程学院,四川 成都 610059
  • 收稿日期:2020-11-19 修回日期:2022-04-26 出版日期:2022-12-10 发布日期:2023-01-11
  • 通讯作者: 隆兆笃
  • 作者简介:隆兆笃,男,工程师,1983年出生,勘查技术与工程专业,从事铀矿地质研究。Email:277136763@qq.com
    王战永,男,高级工程师,1986年出生,矿产普查与勘探专业,从事铀矿地质研究。Email:410618312@qq.com
  • 基金资助:
    中国核工业地质局区域评价项目“四川省冕宁县石梯子—来子尔地区铀矿资源调查评价”(201476)

Analysis of Geochemical Characteristics and Uranium Metallogenic Conditions of Mianxi Pluton in Sichuan

WANG Zhanyong1(), LONG Zhaodu1(), XIE Bo1, SUN Yue2, LI Juchu3, XIANG Jie1, FAN Yonghong1   

  1. 1. Research Institute No.280,CNNC,Guanghan,Sichuan 618300,China
    2. Ganzhou Jinrui Uranium Co.,Ltd.,CNNC, Ganzhou,Jiangxi 341000,China
    3. College of Nuclear Techonlogy and Automation Engineering, Chengdu University of Technology, Chengdu,Sichuan 610059,China
  • Received:2020-11-19 Revised:2022-04-26 Online:2022-12-10 Published:2023-01-11
  • Contact: LONG Zhaodu

摘要:

冕西花岗岩体位于康滇地轴北段,区内已发现铀矿点3个、铀矿化点4个以及大量铀异常(带)。收集整理了该岩体以往地质资料,开展了岩石地球化学分析及电子探针测试等工作,对其铀成矿条件进行了综合分析。结果表明: 冕西岩体SiO2含量偏高,一般为73%~78%,平均达75.09%,碱度高,K2O+Na2O平均含量大于8%,是在伸展构造环境下形成的A型花岗岩,为多期多阶段形成的复式花岗岩体,岩浆分异演化程度较高,岩体内断裂构造发育,并广泛发育以煌斑岩脉为代表的基性岩脉。区内存在煌斑岩脉型、碱交代型和碎裂蚀变岩型3种铀矿化类型,铀矿化受断裂构造、煌斑岩脉及热液蚀变的控制,并提出岩体北段具有较好的铀成矿条件,可作为下一步铀矿勘查的重点地段。

关键词: 岩石地球化学, 铀矿化类型, 铀成矿条件, 冕西岩体

Abstract:

Mianxi granitic pluton is located in the northern segment of the Xikang-Yunnan Axis. In the area, there has been the occurrence of three uranium deposits, four uranium mineralization sites, and a large number of uranium anomalies (zones). With a collection of previous geological data about this granitic pluton, the paper has made a comprehensive analysis on its uranium mineralization conditions through demonstrative geochemical study and electron probe test, etc. The results show that Mianxi granitic pluton has a high content of SiO2 averaged at 75.09% (typically 73%-78%) and high alkalinity with an average content of K2O+Na2O greater than 8%. It belongs to type A granite formed in the setting of extensional structure and is identified as a composite granitic pluton developed in multiple phases and stages.With a high degree of magmatic differentiation and evolution, the pluton has developed a fracture structure and extensive basic dikes represented by lamprophyre veins. There are three types of uranium mineralization in the area, i.e., lamprophyre veins, alkalic metasomatism and fractured alteration. Besides, uranium mineralization is subject to the fracture structure, lamprophyre veins and hydrothermal alteration. As proposed in the paper, the northern segment of the pluton has better conditions for uranium mineralization, so it can be targeted as the key area for further uranium exploration.

Key words: lithogeochemistry, uranium mineralization type, uranium metallogenic condition, Mianxi granitic pluton

中图分类号: