The geochronology research on uraninite in the Dashigou carbonate-type molybdenum deposit of East Qinling area and its geological significance

被引：0
|
作者：
Huang G. [1 ]
Pan C. [1 ]
Pan J. [1 ]
Zhong F. [1 ]
Yan J. [1 ]
Xia F. [1 ]
Du H. [1 ]
Zhang T. [1 ,2 ]
Wan J. [1 ]
Kang Q. [1 ,3 ]
机构：
[1] State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Jiangxi, Nanchang
[2] Changsha Uranium Geology Research Institute, CNNC, Hunan, Changsha
[3] Team 224 of Sino Shaanxi Nuclear Industry Group, Shaanxi, Xi'an
来源：
Dizhi Xuebao/Acta Geologica Sinica | 2023年 / 97卷 / 06期
关键词：
Dashigou deposit; East Qinling; EPMA U-Th-PbTotal chemical age; LA-ICP-MS U-Pb dating; uraninite;
D O I：
10.19762/j.cnki.dizhixuebao.2022159
中图分类号：
学科分类号：
摘要：
The East Qinling area is the largest molybdenum metallogenic belt in the world, as well as the most important molybdenum ore-concentrated area in China. The Dashigou deposit is one of the typical carbonatite-type molybdenum deposits in East Qinling area. Molybdenum mineralization is the main mineralization in Dashigou deposit, accompanied by uranium, rare earth, lead and other metal mineralization. Previous studies have paid more attention to molybdenum and rare earth mineralization in this deposit, but only few have researched uranium mineralization. In this study, typical uranium mineralization samples were selected to conduct TIMA, scanning electron microscopy, electron probe microanalyzer and laser ablation inductively coupled plasma mass spectrometry for identifying petrographical, geochemical features of minerals and isotopic geochemical research. The results show that the main uranium minerals of uranium mineralization in Dashigou deposit are brannerite, uraninite and betafite. The uraninite is characterized by high Y, Ce and low Si, Ti, Na and Mg. The U/Th, ΣREE, LREE/HREE of the uraninite indicate a magmatic origin, which formed in high temperature, high salinity and relatively reducing environment. The uraninite EPMA U-Th-PbTotal chemical dating and LA-ICP-MS in-situ U-Pb dating result show the uranium mineralization epoch is ~223 Ma (late Triassic), which indicated that the uranium mineralization in the Dashigou carbonatite was formed in the post-orogenic extensional environment of the Qinling Orogenic Belt during the Indosinian. Based on previous studies and this paper, it is concluded that the uranium mineralization epoch of the Dashigou deposit is consistent with the main carbonatite molybdenum deposit in the Qinling Orogenic Belt. As products of magmatic activity in the same period, the uranium mineralization and molybdenum mineralization may have formed in the same geological event. © 2023 Geological Society of China. All rights reserved.
引用
收藏
页码：1917 / 1937
页数：20
相关论文
共 72 条
  • [1] Alexandre P, Kyser T K., Effects of cationic substitutions and alteration in uraninite, and implications for the dating of uranium deposits, The Canadian Mineralogist, 43, 3, pp. 1005-1017, (2005)
  • [2] Atencio D, Andrade M B, Chrisry A G, Giere R, Kartashov P M., The phrochlore supergroup of minerals: Nomenclature, The Canadian Mineralogist, 48, pp. 673-698, (2010)
  • [3] Tian Bai, Wei Chen, Shaoyong Jiang, Evolution of the carbonatite Mo-HREE deposits in the Lesser Qinling Orogen: Insights from in situ geochemical investigation of calcite and sulfate, Ore Geology Reviews, 113, (2019)
  • [4] Bowles J F W., Age dating of individual grains of uraninite in rocks from electron microprobe analyses, Chemical Geology, 83, 1-2, pp. 47-53, (1990)
  • [5] Cangelosi D, Smith M, Banks D, Yardley B., The role of sulfate-rich fluids in heavy rare earth enrichment at the Dashigou carbonatite deposit, Huanglongpu, China, Mineralogical Magazine, 84, 1, pp. 65-80, (2020)
  • [6] Cao Jing, Ye Huishou, Li Hongying, Li Zhengyuan, Zhan Xingkang, He Wen, Li Chao, Geological characteristics and molybdenite Re-Os isotopic dating of Huangshuian carbonatite vein-type Mo (Pb) deposit in Songxian County, Henan Province, Mineral Deposits, 33, 1, pp. 53-69, (2014)
  • [7] Cao Jing, Ye Huishou, Li Zhengyuan, Zhang Xingkang, Wang Peng, He Wen, Geochronology, geochemistry and petrogenesis of the Mogou alkali pluton in the East Qinling orogenic belt, Acta Petrologica et Mineralogica, 34, 5, pp. 665-684, (2015)
  • [8] Chen Qian, Song Wenlei, Yang Jinkun, Hu Yi, Huang Jun, Zhang Tao, Zheng Guoshun, Principle of automated mineral quantitative analysis system and its application in petrology and mineralogy: An example from TESCAN TIMA, Mineral Deposits, 40, 2, pp. 345-368, (2021)
  • [9] Chen Youwei, Hu Ruizhong, Luo Jincheng, Dong Shaohua, In-situ mineral chemistry and chronology analyses of the pitchblende in the Shazijiang uranium deposit and their implications for mineralization, Acta Petrologica Sinica, 35, 9, pp. 2679-2694, (2019)
  • [10] Chipley D, Polito P A, Kyser T K., Measurement of U-Pb ages of uraninite and davidite by laser ablation-HR-ICP-MS, American Mineralogist, 92, 11, pp. 1925-1935, (2007)
12345678