|Table of Contents|

Characteristics of Fluid Inclusions of the Ultra-rich Ore from Zoujiashan Uranium Deposit in Xiangshan Orefield of Jiangxi, China: Insights from Paragenesis Apatite-purple Black Fine Crystal Fluorite and Other Minerals(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2020年第04期
Page:
526-539
Research Field:
基础地质与矿产地质
Publishing date:

Info

Title:
Characteristics of Fluid Inclusions of the Ultra-rich Ore from Zoujiashan Uranium Deposit in Xiangshan Orefield of Jiangxi, China: Insights from Paragenesis Apatite-purple Black Fine Crystal Fluorite and Other Minerals
Author(s):
GUO Jing-jing1;  QIU Lin-fei2;  HU Bao-qun1*;  GAO Hai-dong1;  WANG Yun1;  XUE Dong1
(1. School of Earth Sciences, East China University of Technology, Nanchang 330013, Jiangxi, China; 2. Beijing Research Institute of Uranium Geology, Beijing 100029, China)
Keywords:
uranium deposit;  fluid inclusion;  apatite;  purple black fine crystal fluorite;  homogenization temperature;  salinity;  laser Raman spectrum;  Jiangxi
PACS:
P619.14
DOI:
10.19814/j.jese.2020.04023
Abstract:
Xiangshan uranium orefield in Jiangxi is always the focus of scholars. Most of them chose fluid inclusions in gangue minerals with good crystallization and high transparency for research. These gangue minerals are generally the products of crystallization in the late or post mineralization period, and the results are difficult to accurately reflect the information of ore-forming fluids. In view of this, the apatite and its associated fine crystal transparent mineral, which are closely associated with uranium minerals of the ultra-rich ore in Zoujiashan uranium deposit, were studied by petrographic observation, SEM-EDS analysis and fluid inclusions determining. Ore-forming fluid properties of the deposit were discussed in order to provide new information for the determination of ore-forming fluid source and the study of ore-forming process. The results show that there are two types of apatites closely associated with uranium minerals in ultra-rich uranium ore. One is microcrystalline apatite(Ap1)with inclusions of black minerals, which has poor crystal shape, irregular shape, poor transparency and small particle size, and it should be formed in main ore-forming stage. Microcrystalline quartz and purple black fine crystal fluorite are associated with microcrystalline apatite, and both are formed in main ore-forming stage. The another one is medium coarse crystalline apatite(Ap2), which has high degree of automorphism, regular shape, hexagonal column shape and large particle size, and it should be formed in late ore-forming stage. In main ore-forming stage, the gas composition of fluid inclusions in the purple black fine crystal fluorite is mainly H2, and that of fluid inclusions in microcrystalline quartz is mainly O2 and CO2. It shows that the gas composition of the ore-forming fluids is mainly H2 and O2, and a small amount of CO2, indicating that the ore-forming fluids have the addition of deep source fluid rich in H2. The homogenization temperature of fluid inclusions is concentrated in 270 ℃-330 ℃, and the salinity is 5%-9% NaCleq in main ore-forming stage. The homogenization temperature of fluid inclusions is concentrated in 180 ℃-220 ℃, the salinity is 4%-10% NaCleq in late ore-forming stage, and the lowest mineralization temperature is above 180 ℃. The characteristics of fluid inclusion assemblage in apatite and its associated gangue minerals in the metallogenic stage of ultra-rich uranium ore indicate the fluid properties in the main ore-forming stage of uranium.

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Last Update: 2020-07-27