Geochemical features of hot spring gases in the Jinshajiang-Red River fault zone, Southeast Tibetan Plateau

Zhou, Xiaocheng; Wang, Wanli; Li, Liwu; JianMin, HOU; Xing, Lantian; Li, Zhongping; Hu, Shi; Yan, Yucong

doi:10.18654/1000-0569/2020.07.18

Cited by 33 publications

(7 citation statements)

References 46 publications

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“…The temperatures of Luojishan hot spring water were measured with a thermometer having an accuracy of 0.1°C. The composition of gas samples from Luojishan hot spring were analyzed with a Agilent Macro 3000 gas chromatography (Zhou et al, 2015;Zhou et al, 2020). Helium and Neon isotopes in the gas samples were measured using the Noblesse noble gas mass spectrometer.…”

Section: Methods Hot Spring Gas Samplingmentioning

confidence: 99%

Short-Term Seismic Precursor Anomalies of Hydrogen Concentration in Luojishan Hot Spring Bubbling Gas, Eastern Tibetan Plateau

et al. 2021

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The gas compositions (He, H2, CO2, CH4, Ar and N2) and isotope ratios (3He/4He and δ13C) were yearly investigated from April 2010 to April 2019 at the Luojishan spring located in the proximity of the Zemuhe Fault, eastern Tibetan Plateau. The continuous automatic monitoring of hydrogen concentrations in Luojishan hot spring bubbling gas for the purpose of earthquake prediction requires the discrimination of seismic precursor anomalies. Helium isotope ratios (3He/4He) in the bubbling gas of hot springs varied from 0.05 to 0.18 Ra (Ra = 3He/4He = 1.39 × 10−6 in the air), with a maximum mantle-derived He up to 2.2% of the total He measured in the Luojishan hot spring (assuming R/Ra = 8.0 for mantle). This suggests that Zemuhe Fault might act as a conduit for crustal-derived fluid. N2 concentrations in the majority of the hot spring was ≥80 vol%, and δ13CCO2 values varied from −13.2 to −9.3‰ (vs.PDB). Hydrogen concentration time series display a complex temporal pattern reflecting a wide range of different physical processes. There were short-term (5–60 h) seismic precursor anomalies of hydrogen concentration before natural earthquake. The anthropogenically-induced earthquakes provoke only post-earthquake responses. The concentration of hydrogen in bubbling gas of the Luojishan hot spring is sensitive to increase of stress in the Xianshuihe-Xiaojiang fault system. Monitoring the hydrogen concentrations with automatic gas stations may be promising tool for unraveling earthquake mechanisms and for predicting earthquakes.

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Section: Methods Hot Spring Gas Samplingmentioning

confidence: 99%

Short-Term Seismic Precursor Anomalies of Hydrogen Concentration in Luojishan Hot Spring Bubbling Gas, Eastern Tibetan Plateau

et al. 2021

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“…Based on previous geophysical and geochemical observations (Sun et al, 2014;M. Xu et al, 2006;X. Zhou et al, 2020), the higher 3 He/ 4 He ratios along the RRF suggest that it is a deep fault that cuts through the crust.…”

Section: Origins and Spatial Distributions Of Gas Geochemistrymentioning

confidence: 77%

“…The frequent occurrence of strong earthquakes along the eastern boundary of the SYB has intensified the rotation of the block with ongoing southward compression, making it necessary to further investigate the tectonic activity of the front edge of the SYB. Some studies on geothermal fluid geochemistry in the area have focused on the hydrothermal circulation characteristics and volatile origin at both a single fault and limited locations at the front edge of the SYB (He et al., 2023; C. Li et al., 2021; Shao et al., 2022; Y. Wang, Zhao, et al., 2014; X. Zhou et al., 2020). Nevertheless, fluid geochemistry research on the intersection relationship between the XJF and RRF is lacking, and the relationship between fluid geochemistry and regional tectonic features in the front edge of SYB remains unclear.…”

Section: Introductionmentioning

confidence: 99%

Geochemical Characteristics of Thermal Springs and Insights Into the Intersection Between the Xiaojiang Fault and the Red River Fault, Southeastern Tibet Plateau

Shao,

Liu,

et al. 2024

Geochem Geophys Geosyst

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During the ongoing uplift and expansion of the southeastern margin of the Tibetan Plateau, the front edge of the Sichuan‐Yunnan rhombic block (SYB) has experienced intense tectonic activity and frequent seismicity. In this study, the fluid geochemistry in the primary active faults at the front edge of the SYB was investigated, with the aim of understanding the tectonic activity and intersection relationship between the Xiaojiang fault (XJF) and the Red River fault (RRF). Thermal spring water and gases exhibit a coupled spatial distribution relationship; relatively high ion concentrations and 3He/4He ratios (Rc/Ra ratios of 0.21 to 0.62Ra) are observed along the RRF, Qujiang fault (QJF), and Shiping‐Jianshui fault (SJF). Multidisciplinary research results have indicated that mantle‐derived intrusion has been detected in the crust beneath the QJF and SJF. The current tectonic activity in the front edge of the SYB remains intense, with compressive stresses shifting toward the western side of the XJF and accumulating on the QJF and SJF. This has led to the development of fractures, enhancing the water–rock interaction and deep‐derived gas degassing along the faults. The unmixing characteristics of fluids at the intersection area of these two faults suggest the absence of conduits for fluid migration between the faults. Owing to the lower gas 3He/4He ratios, lower shear strain rates, stable reservoir temperature field, and extremely low historical seismicity in the Indo‐Chinese block, it is speculated that the current movement of the XJF may not cut through the RRF and continue southward.

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“…Previous studies primarily focused on the soil gas and hotspring gas at the western boundary of the Chuan-Dian rhombic block (e.g. Li et al, 2018;Zhou et al, 2020). However, at the eastern boundary of the rhombic block, only the geochemical characteristics of several gas species (CO 2 , Rn, and Hg) in the middle part of the XXFS have been reported (Zhang et al, 2019a;Zhange, 2019b).…”

Section: Introductionmentioning

confidence: 99%

Soil Degassing From the Xianshuihe–Xiaojiang Fault System at the Eastern Boundary of the Chuan–Dian Rhombic Block, Southwest China

et al. 2021

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The Chuan–Dian region, situated in the middle part of the north-south seismic zone of mainland China in a highly deformed area of the eastern margin of the Tibetan Plateau, is one of the principal areas for monitoring earthquake activities in China. In this study, the geochemical characteristics of soil degassing (of CH4, H2, CO2, Rn, and Hg) and, the relationship between degassing and fault activity, were investigated in the Xianshuihe–Xiaojiang fault system (XXFS) at the eastern boundary of the Chuan–Dian rhombic block. The mean soil-gas concentrations of CH4, H2, CO2, Rn, and Hg in the XXFS were 8.1 ppm, 9.9 ppm, 0.5%, 15.1 kBq/m3 and 12.9 ng/m3, respectively. The δ13CCO2 and δ13CCH4 values of the hot-spring gases varied from −11.9‰ to −3.7‰ and −62.5‰ to 17‰, respectively. The He-C isotopic ratios indicate that the carbon in the northern and middle parts of the XXFS may have originated from deep fluids, whereas the carbon in the southern part of the XXFS is of organic origin. The high concentrations of soil gas were distributed near the faults, indicating that the faults could act as channels for gas migration. The distributions of the high soil-gas concentrations in the XXFS coincide with the highest stress and maximum strain rates, indicating that the fault activity enhanced permeability and increased the emission rates of the gases. The results of this study will be helpful for degassing in active fault zones and earthquake monitoring.

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Geochemical features of hot spring gases in the Jinshajiang-Red River fault zone, Southeast Tibetan Plateau

Cited by 33 publications

References 46 publications

Short-Term Seismic Precursor Anomalies of Hydrogen Concentration in Luojishan Hot Spring Bubbling Gas, Eastern Tibetan Plateau

Short-Term Seismic Precursor Anomalies of Hydrogen Concentration in Luojishan Hot Spring Bubbling Gas, Eastern Tibetan Plateau

Geochemical Characteristics of Thermal Springs and Insights Into the Intersection Between the Xiaojiang Fault and the Red River Fault, Southeastern Tibet Plateau

Soil Degassing From the Xianshuihe–Xiaojiang Fault System at the Eastern Boundary of the Chuan–Dian Rhombic Block, Southwest China

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