Geothermal evolution of deep parent fluid in Western Guangdong, China: evidence from water chemistry, stable isotopes and geothermometry

Ndikubwimana, Innocent; Mao, Xumei; Zhu, Dongbo; He, Yaoye; Shi, Zide

doi:10.1007/s10040-020-02222-x

Cited by 14 publications

(5 citation statements)

References 74 publications

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“…where H is the circulation depth (m), T Z the estimated reservoir equilibrium temperature ( • C), T 0 is the local annual temperature ( • C), G is the thermal gradient ( • C/km), and H 0 is the thickness of the constant temperature zone (m). The constant temperature zone is defined as the subsurface depth at which changes in atmospheric temperature have no effect on the temperature of the zone [40]. From previous studies, we chose values of H 0 = 20 m, T 0 = 18 • C, and G = 18.2 • C/km [39,41].…”

Section: Geothermometry and Circulation Depthmentioning

confidence: 99%

Role of Atmospheric Temperature and Seismic Activity in Spring Water Hydrogeochemistry in Urumqi, China

Zhou

Zhong

2022

IJERPH

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Springs offer insight into the sources and mechanisms of groundwater recharge and can be used to characterize fluid migration during earthquakes. However, few reports provide sufficient annual hydrochemical and isotopic data to compare the variation characteristics and mechanisms with both atmospheric temperature and seismic effects. In this study, we used continuous δ2H, δ18O, and major ion data from four springs over 1 year to understand the groundwater origin, recharge sources, circulation characteristics, and coupling relationships with atmospheric temperature and earthquakes. We found that (1) atmospheric temperatures above and below 0 °C can cause significant changes in ion concentrations and water circulation depth, resulting in the mixing of fresh and old water in the aquifer, but it cannot cause changes in δ2H and δ18O. (2) Earthquakes of magnitude ≥ 4.8 within a 66 km epicentral distance can alter fault zone characteristics (e.g., permeability) and aggravate water–rock reactions, resulting in significant changes in δ2H, δ18O, and hydrochemical ion concentrations. (3) Hydrogen and oxygen isotopes are the most sensitive precursory seismic indicators. The results of this study offer a reference for the establishment of long-term hydrochemical and isotopic monitoring, with the potential for use in earthquake forecasting.

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Section: Geothermometry and Circulation Depthmentioning

confidence: 99%

Role of Atmospheric Temperature and Seismic Activity in Spring Water Hydrogeochemistry in Urumqi, China

Zhou

Zhong

2022

IJERPH

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“…The deep heat sources and water-rock interactions can lead to changes in geothermal physicochemical parameters (temperature, density, and salinity) when deep geothermal water circulates in a convective hydrothermal system (Stelling et al, 2016;Ndikubwimana et al, 2020). Changes in the physical and chemical properties of geothermal water may affect the movement of groundwater (Magri et al, 2011;Nyakundi et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

The additional acceleration of geothermal water flow in the discharge section by the geothermal driving force

et al. 2023

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The rise of geothermal water level can be observed in the discharge section in a convective hydrothermal system. It is hard to explain in terms of gravity-driven groundwater systems, suggesting the existence of an additional driving force. This geothermal driving force is closely related to the changes in density, salinity, and viscosity caused by the increase in groundwater temperature. It is significant to quantitatively characterize the geothermal driving force for the interpretation of geothermal water level and flow. A case study is carried out in a convective geothermal system in Huangshadong, South China. The recharged groundwater migrated to a position with an average depth of 2.09 km and was heated to 100-130 ℃. The geothermal driving force produced by the increase in temperature and in salinity is +125.33 m and −2.62 m, respectively. The actual pressure head produced by the geothermal driving force is +122.71 m. The migration speed of geothermal water under the action of geothermal driving force from the heating position to the discharge area increased from 2.14×10 -3 m/d to 3.09×10 -3 m/d. The results indicate the presence of a geothermal driving force accelerates the groundwater migration in the discharge section of convective hydrothermal system.

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“…In addition to volcanic activity (Hsu and Yeh, 2020), tectonic activity, radioactive decay, and deep heat conduction can all provide heat sources for geothermal systems (Cathelineau et al, 1994;Mayo and Loucks, 1995;Imbach, 1997;Han et al, 2010;Li et al, 2019). Water-rock interaction provides the formation of hydrochemical components in geothermal water, which can form high salinity geothermal water as parent fluids in the depth (Ndikubwimana et al, 2020). The characteristics of hydrochemical components are closely related to the properties of heat sources and surrounding rock minerals.…”

Section: Introductionmentioning

confidence: 99%

The mechanism of high salinity geothermal water formed in karst low-temperature hydrothermal system

Mao

Zhao

et al. 2023

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The formation mechanism of high salinity geothermal water is significant for utilizing geothermal resources and mineral resources. The high salinity in geothermal water may be derived from the geothermal mother fluid or from the evaporite dissolution. It is difficult to distinguish between these two sources because they may have similar hydrochemistry. In this paper, water chemistry and stable isotopes were used to explore the high salinity geothermal water in Yanchanghe geothermal field, central China. It is a lowtemperature hydrothermal system in the inland karst area. The thermal water is Cl-Na type with high salinity (TDS > 8,400 mg/L). The modified silicon thermometer is more suitable and the reasonable result is about 58.8 ℃. The maximum circulation depth is 1.9 km. Using the temperature of hot and cold water to estimate the mixing ratio is 58%-81%. Saturation index (SI), Na/1000-K/100-Mg 1/2 and Gibbs diagram suggest that the main source of salt in geothermal water is derived from the evaporite dissolution, which provides Clof 11,264-31,279 mg/L and Na + of 9,272-21,236 mg/L. We found the combination of temperature and hydrogeochemistry can be used to investigate the formation mechanism and mixing process of high-salinity geothermal water formed in a karst low-temperature hydrothermal system.

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Geothermal evolution of deep parent fluid in Western Guangdong, China: evidence from water chemistry, stable isotopes and geothermometry

Cited by 14 publications

References 74 publications

Role of Atmospheric Temperature and Seismic Activity in Spring Water Hydrogeochemistry in Urumqi, China

Role of Atmospheric Temperature and Seismic Activity in Spring Water Hydrogeochemistry in Urumqi, China

The additional acceleration of geothermal water flow in the discharge section by the geothermal driving force

The mechanism of high salinity geothermal water formed in karst low-temperature hydrothermal system

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