scholarly journals Hydrothermal Fluid Sources of the Fengjia Barite-fluorite Deposit in Southeast Sichuan, China: Evidence from Fluid Inclusions and Hydrogen and Oxygen Isotopes

2015 ◽  
Vol 66 (1) ◽  
pp. 24-36 ◽  
Author(s):  
Hao Zou ◽  
Shou-ting Zhang ◽  
An-qing Chen ◽  
Yi Fang ◽  
Zhao-fa Zeng
Keyword(s):  
Oxygen Isotopes ◽  
Fluid Inclusions ◽  
Hydrothermal Fluid ◽  
Hydrogen And Oxygen Isotopes ◽  
Fluid Sources

scholarly journals Hydrothermal Alteration and Its Superimposed Enrichment for Qianjiadian Tabular-Type Uranium Deposit in Southwestern Songliao Basin

Minerals ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 52
Author(s):  
Ming-Kuan Qin ◽  
Shao-Hua Huang ◽  
Jia-Lin Liu ◽  
Zhang-Yue Liu ◽  
Qiang Guo ◽  
...  
Keyword(s):  
Oxygen Isotopes ◽  
Fluid Inclusions ◽  
Hydrothermal Fluid ◽  
Homogenization Temperature ◽  
Hydrothermal Activity ◽  
Uranium Mineralization ◽  
Uranium Deposits ◽  
Carbonate Minerals ◽  
Carbon And Oxygen Isotopes ◽  
Different Types

The evolution characteristics of hydrothermal activity and superimposed uranium mineralization in the Qianjiadian ore field in southwestern Songliao Basin are still controversial and lack direct evidence. In this comprehensive study, a detailed identification of dolerite and hydrothermally altered un-mineralized sandstone and sandstone-hosted ore in the Yaojia Formation have been performed through the use of scanning electron microscopy observation, electron probe, carbon-oxygen-sulfur isotope, and fluid inclusion analyses. The results show that the hydrothermal fluid derived from the intermediate-basic magma intrusion is a low-temperature reducing alkaline fluid and rich in CO2, Si, Zr, Ti, Fe, Mg, Mn, and Ca, producing different types of altered mineral assemblages in the rocks, including carbonation, pyritization, sphalerite mineralization, clausthalite mineralization, silicification, and biotitization. Specifically, the carbonate minerals in sandstone are mixed products of deep hydrothermal fluid and meteoric water, with carbon and oxygen isotopes ranging from −5.2‰ to −1.7‰ and −20.4‰ to −11.1‰, respectively. Carbon source of the carbonate minerals in dolerite is mainly inorganic carbon produced at the late stage of intermediate-basic magma evolution, with carbon and oxygen isotopes from −16.1‰ to −7.2‰ and −18.2‰ to −14.5‰, respectively. Various carbonate minerals in the rocks may have been precipitated by the hydrothermal fluid after the magmatic stage, due to the change of its CO2 fugacity, temperature, and cation concentration during the long-term evolution stage. A series of carbonate minerals were generated as calcite, dolomite, ankerite, ferromanganese dolomite, and dawsonite. The precipitation processes and different types of carbonate mineral mixtures identified in this study mainly occur as parallel, gradual transition, interlacing, or inclusion metasomatism in the same vein body, without obvious mineralogical and petrologic characteristics of penetrating relationship. Homogenization temperature of fluid inclusions in calcite is high, in the range of 203–234 °C, with a low salinity of 0.71–4.34% NaCl, and the data range is relatively concentrated. Homogenization temperature of fluid inclusions in ankerite is usually low, ranging from 100 °C to 232 °C, with a high salinity of 4.18–9.98% NaCl. The precipitation processes of carbonate minerals and the results of this study are basically in consistent. Overall, the sandstone-type uranium deposits have a temporal and genetic relationship with hydrothermal activities during Paleogene. (1) Hydrothermal activity was directly involved in uranium mineralization, result in dissolution and reprecipitation of earlier uranium minerals, forming uranium-bearing ankerite and complexes containing uranium, zirconium, silicon, and titanium. (2) Hydrothermal fluid activity provided reducing agent to promote hydrocarbon generation from pyrolysis of carbonaceous fragments and accelerate uranium precipitation rate. (3) Regional water stagnation prolongs reaction time, contributing to huge uranium enrichment. This study provides new petrologic, mineralogical, and geochemical evidence for multi-fluid coupled and superimposed mineralization of sandstone-hosted uranium deposits in the sedimentary basin.

The magmatic hydrothermal system at Julcani, Peru; evidence from fluid inclusions and hydrogen and oxygen isotopes

1994 ◽  
Vol 89 (8) ◽  
pp. 1924-1938 ◽  
Author(s):  
Jeffrey A. Deen ◽  
Robert O. Rye ◽  
James L. Munoz ◽  
John W. Drexler
Keyword(s):  
Oxygen Isotopes ◽  
Fluid Inclusions ◽  
Hydrothermal System ◽  
Hydrogen And Oxygen Isotopes

scholarly journals Dawsonite as a daughter mineral in hydrothermal fluid inclusions

1971 ◽  
Vol 32 (4) ◽  
pp. 334-342 ◽  
Author(s):  
Raymond M. Coveney ◽  
William C. Kelly
Keyword(s):  
Fluid Inclusions ◽  
Hydrothermal Fluid ◽  
Daughter Mineral

scholarly journals Determining the Discharge and Recharge Relationships between Lake and Groundwater in Lake Hulun Using Hydrogen and Oxygen Isotopes and Chloride Ions

Water ◽  
2019 ◽  
Vol 11 (2) ◽  
pp. 264 ◽  
Author(s):  
Zhiming Han ◽  
Xiaohong Shi ◽  
Keli Jia ◽  
Biao Sun ◽  
Shengnan Zhao ◽  
...  
Keyword(s):  
Oxygen Isotopes ◽  
Meteoric Water ◽  
Chloride Ions ◽  
Water Levels ◽  
Tracer Method ◽  
Aeration Zone ◽  
Fractionation Process ◽  
Hydrogen And Oxygen Isotopes ◽  
Freezing Period

This study examined the discharge and recharge relationships between lake and groundwater in Lake Hulun using a novel tracer method that tracks hydrogen and oxygen isotopes and chloride ions. The hydrogen and oxygen isotopes in precipitation falling in the Lake Hulun Basin were compared with those in water samples from the lake and from the local river, well and spring water during both freezing and non-freezing periods in 2017. The results showed that the local meteoric water line equation in the Lake Hulun area is δD = 6.68 δ18O − 5.89‰ (R2 = 0.96) and the main source of water supply in the study area is precipitation. Long-term groundwater monitoring data revealed that the groundwater is effectively recharged by precipitation through the aeration zone. Exchanges between the various compounds during the strong evaporative fractionation process in groundwater are responsible for the gradual depletion of δ18O. The lake is recharged by groundwater during the non-freezing period, as shown in the map constructed to show the recharge and discharge relationships between the lake and groundwater. The steadily rising lake water levels in the summer mean that the water level before the freeze is high and consequently the water in the lake drains into the surrounding groundwater via faults along both sides of the lake during the frozen period. The groundwater is discharged into the lake in the west and into the Urson River in the east due to the Cuogang uplift.

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