地质通报2017，Vol.36Issue(4)：534-540,7.
流体包裹体特征及其地质意义——以甘肃省芨岭铀矿床为例
Characteristics of fluid inclusions and their geological significance: A case study of the Jiling uranium deposit in Gansu Province
摘要
Abstract
Detailed study of fluid inclusions in metallogenic period carbonate veins was conducted to reveal the ore-forming fluid features.Petrographic and microthermometric studies of fluid inclusions suggest that the main types of fluid inclusions of the Jiling uranium deposit are gaseous,liquid and pure liquid inclusions.Temperature test shows that the homogenization temperature and salinity of fluid inclusions vary from 141℃ to 295℃ (mostly in the ranges of 170～180℃ and 240～250℃) and 2.09％～7.69％ NaCleqv (with the peak values varying in the range of 5％～6％Na Cleqv) respectively.Based on these results,the authors have reached the conclusion that the ore-forming fluids of the Jiling uranium deposit should be of low temperature and salinity.Laser Raman and group fluid inclusions content studies indicate that gas composition of the ore-forming fluids are mainly CH4 and H22 with some H2S,N2,and CO2.The ore-forming fluids are then defined to be of the NaCl-H2O±CH4±CO2 system.The results show that δ 13C values relative to the VPDB scale range from-1.50‰ to-6.33‰,and δ 18O values fall between-2.577‰ and 5.051‰.The features of ore-forming fluids show that hydrothermal fluids are characterized by a mixture of magmatic fluids and atmospheric water,dominated by the latter.Further research suggests that the mineralized Σ CO2 mainly came from mantle degassing related to regional deep faults with minor contribution of marine carbonate rocks.It is concluded that uranium deposition in the Jiling area was related to the phase separation.关键词
芨岭铀矿床/流体包裹体/地质意义/甘肃省Key words
Jiling uranium deposit/fluid inclusion/geological significance/Gansu Province分类
天文与地球科学引用本文复制引用
苟学明,权建平,刘治国,冯伟,宋宪生,陈云杰..流体包裹体特征及其地质意义——以甘肃省芨岭铀矿床为例[J].地质通报,2017,36(4):534-540,7.基金项目
中国地质调查局项目《甘肃省北祁连成矿带民乐—皇城地区铀矿资源调查评价》(编号:DD2016013622) （编号:DD2016013622）
