Geochemical evidence for the nonexistence of supercritical geothermal fluids at the Yangbajing geothermal field, southern Tibet

Wang, Yingchun; Li, Liang; Wen, Hao; Hao, Yanming

doi:10.1016/j.jhydrol.2021.127243

Cited by 43 publications

(28 citation statements)

References 176 publications

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“…Mantle hot materials upwelled into the crust along the IS tearing windows and are geophysically imaged as low velocity bodies or high conductivity bodies in the middle and lower crust (Nelson, 1996;Wei et al, 2001;Unsworth et al, 2005;Jin et al, 2022). In addition, the tearing of IS caused the East-West extension of the upper crust, and several North-South trending rifts were formed in the Southern Tibet, such as the YGR (Wang Y et al, 2022;Lei et al, 2023). Mantle upwelling brought a large number of hot materials to the middle and lower crust (Li and Song, 2018), which lead to partial melting of crust.…”

Section: Conductors C1 and C2 Revealed By Mt Implying The Heat Source...mentioning

confidence: 99%

Electrical structure of Gulu geothermal field in Southern Tibet and its implication for the high-temperature geothermal system

Wan

Wang²

2023

Front. Earth Sci.

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The Yadong-Gulu rift (YGR) South Tibet is a Cenozoic active rift, which is endowed with abundant geothermal resources. The Gulu geothermal field (GGF) is located in the Northern section of the rift, where a large number of high-temperature hot springs develop, but its geothermal system is mysterious. In this study, the three-dimensional (3D) electrical structure of GGF is revealed by broad magnetotelluric (MT) and audio magnetotelluric (AMT). MT reveals that middle and upper crust conductors are developed in the subsurface of GGF. The conductors may originate from the partial melting that drives the geothermal system. AMT reveals that the electrical structure of GGF is conductive alternation cap overlying more resistive reservoir, which is consistent with the classical electrical structure of geothermal systems in worldwide active tectonic zones. According to the geothermal system model, cold fluids may converge from the periphery of GGF to the middle, wherein fault F1 (the Western branch of Jiulazi-Sanxung fault) may be the main channel for cold fluids to migrate downward. The fluids are heated by partial melting in the middle and upper crust, and may migrate upward along fault F2 (the middle branch of Jiulazi-Sanxung fault) and develop into heat reservoirs.

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Section: Conductors C1 and C2 Revealed By Mt Implying The Heat Source...mentioning

confidence: 99%

Electrical structure of Gulu geothermal field in Southern Tibet and its implication for the high-temperature geothermal system

Wan

Wang²

2023

Front. Earth Sci.

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“…The Tibetan Plateau (TP) was formed by the India‐Asia collision since ∼55 Ma and subsequent continental lithosphere subduction (Nábĕlek et al., 2009; Shi et al., 2015; Tapponnier et al., 2001; Taylor & Yin, 2009). The widespread hot springs release large quantities of hydrothermal volatiles (e.g., He, CO 2 , N 2 ) (Hao et al., 2023; Liao, 2018; Wang et al., 2022). Numerous studies of hydrothermal volatiles have detected 3 He/ 4 He ratios >0.1 R A and suggest that mantle contributions are unequivocally present in the TP (Becker, 2006; Hao et al., 2023; Hoke et al., 2000; Klemperer et al., 2013, 2022; Marty et al., 1996; Newell et al., 2008; Sun et al., 2020; Walia et al., 2005; Yokoyama et al., 1999; Zhang, Zhang, et al., 2021; L. Zhang et al., 2017; M. Zhang et al., 2017; Zhao et al., 2022).…”

Section: Introductionmentioning

confidence: 99%

Degassing of Mantle‐Derived Helium From Hot Springs Along the India‐Asia Continental Collision Settings: Origins, Migration Velocity and Flux

Hao,

Gong,

Kuang

et al. 2024

Geochem Geophys Geosyst

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Mantle‐derived volatile degassing lacks quantitative evaluation in continental regions without active magmatism, such as the Tibetan Plateau. Ten new gas abundance and helium isotope data points combined with 286 hydrothermal volatile literature data points in India–Asia continental collision settings demonstrate widespread mantle‐derived volatiles across the thick (∼70 km) crust. The mantle‐derived 3He is best explained by direct mantle volatile input from subcontinental lithospheric mantle (1%–36.5%) or the asthenospheric wedge (1%–27.8%) instead of fossil residual magmatic fluids or Quaternary mantle‐derived melt intrusion into crustal depth. Mantle‐derived 3He is transported from the deep mantle to the surface at an upflow rate of 30–11,700 mm/year based on a newly developed steady‐state one‐dimensional flow model, corresponding to a mantle‐derived 3He flux of 17 to 1.5 × 107 atoms m−2 s−1 (81.7%–99.4% of the total 3He flux) and a mantle‐derived 4He flux from 2.0 × 106 to 1.8 × 1012 atoms m−2 s−1 (1.4%–36.5% of the total 4He flux). The mantle‐derived helium fluxes in the study area are comparable to those of other nonvolcanic hydrothermal systems in the tectonically active regions but lower than those of volcanic fields. The helium transit time ranges from 5.3 ka to 2.3 Ma, indicating that the spatial pattern of 3He/4He ratios in the India‐Asia continental collision settings can provide a snapshot of the state of the Indian mantle lithosphere between those revealed by potassic‐rich mafic rocks (25–8 Ma) and seismic methods (present).

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“…Geothermal energy, a zero-carbon and clean energy source, has an important value for carbon neutrality in its development and utilization. As one of the important resources of non-fossil energy, it has the characteristics of large reserves, wide distribution, and good stability and is not disturbed by external factors such as seasonal, climatic, and diurnal changes and has a broad prospect of development and utilization and shows strong development potential as one of the rising stars of non-fossil energy (Zhu, 1997;Liang et al, 2018;Ma et al, 2021;Wang et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

Processing Method of Soil Temperature Time Series and Its Application in Geothermal Heat Flow

et al. 2022

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Nowadays, geothermal resources have become one of the important means for mankind to solve global energy problems and environmental problems, and the exploration and development of geothermal resources are of great significance for sustainable development. However, in view of the complex geological background of the plateau region, the number of heat flow measurement points in this area is small or even blank, thus becoming an important factor limiting the exploration of geothermal resources in this region. In this article, a new model based on Fourier analysis and heat conduction principle is established to process and analyze the long-term monitoring data of soil temperature and eliminate the influence of temperature change on soil temperature as far as possible, so as to improve the calculation accuracy of soil conduction heat dissipation. The experimental results show that the fluctuation range of soil temperature at 20 cm before the correction was large, and the fluctuation range was 2.58°C–14.284°C, which was because the soil here was closer to the land surface and was affected too much by the temperature fluctuation, and as the soil depth deepened, the temperature fluctuation slowly became smaller, and the fluctuation range was 6.67°C–11.15°C at 50 cm, but the effect of temperature fluctuation was still obvious. Also, the fluctuation range was basically reduced within 0.3°C after temperature correction. In this method, the thermal diffusion coefficients of the soil at different depths can be obtained, and the calculated temperatures at the corresponding depths can also be obtained, which can be used to infer the approximate ground temperature gradient of the measured area. This study aims to develop a convenient and fast model for processing soil temperature time series and to provide technical support for developing geothermal resources in highland areas or assessing the geothermal potential of the region.

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Geochemical evidence for the nonexistence of supercritical geothermal fluids at the Yangbajing geothermal field, southern Tibet

Cited by 43 publications

References 176 publications

Electrical structure of Gulu geothermal field in Southern Tibet and its implication for the high-temperature geothermal system

Electrical structure of Gulu geothermal field in Southern Tibet and its implication for the high-temperature geothermal system

Degassing of Mantle‐Derived Helium From Hot Springs Along the India‐Asia Continental Collision Settings: Origins, Migration Velocity and Flux

Processing Method of Soil Temperature Time Series and Its Application in Geothermal Heat Flow

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