Mantle volatiles in spring gases in the Basin and Range Province on the west of Beijing, China: Constraints from helium and carbon isotopes

Zhang, Weibin; Du, Jianguo; Zhou, Xiaocheng; Wang, Fei

doi:10.1016/j.jvolgeores.2015.10.024

Cited by 21 publications

(17 citation statements)

References 68 publications

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“…The two main origins of underground CO 2 are the microbial degradation of organic matter in sediment and limestone weathering, including water-limestone interactions and limestone decomposition [44,45,47,48]. Thus, an approach analogous to that used for the identification and quantification of CO 2 in volcanic and geothermal regions was adopted [35,49,50]. The mantle (M) end-member was replaced with an air (A) end-member ( Figure 9); then, three major endmember components involving an air (A) end-member, limestone (L) end-member, and sediment (S) end-member were selected to identify and quantify the various sources contributing to CO 2 from the seven new wells.…”

Section: Discussionmentioning

confidence: 99%

“…Gas measurements were performed repeatedly in the field at the end of each month from June to November 2018. Gas samples were also collected from the outlet of the apparatus following the methods described by Chen et al [5] and Zhang et al [35] in September 2018. He/ 20 Ne values were determined by a different mass spectrometer (VG 5400), while δ 13 C values were analyzed by a gas chromatography-pyrolysis-isotope ratio mass spectrometer (HP 6890-Delta Plus XL) with uncertainties of ±0.3‰.…”

Section: Soil Gas Measurement In Selectedmentioning

confidence: 99%

“…Analysis of all the samples was completed from December 5 to December 7, 2018, within 10 days of sampling. Air on the Gaolan Hill in the south of Lanzhou was used to calibrate the instrument [35].…”

Section: Soil Gas Measurement In Selectedmentioning

confidence: 99%

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Evidence of Multiple Sources of Soil Gas in the Tangshan Fault Zone, North China

Zhi

Liu

et al. 2019

Geofluids

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The sources of soil gases in the Tangshan fault zone, North China, were discussed, based on the soil gas compositions and isotopic ratios obtained by measurement in the field and sample analysis in the laboratory. Soil gas compositions and isotopic ratios indicate that air (A) end-member, limestone (L) end-member, and sediment (S) end-member are the major end-member components contributing to the soil gas in our study area, with fractional contributions in the range of 2-15 vol.%, 23-36 vol.%, and 62-65 vol.%, respectively, to CO 2 from the gas wells. According to the relationship among the 3 He/ 4 He, average CO 2 concentration, and He concentration of soil gas, the deepest depth the fault cut downward and the most developed fractures in the segment where the Heibeiligong (HBLG) well located were inferred, and the shallower depth the fault cut downward and the more developed fractures in the fault segments where the Weifengshan (WFS), Siwangzhuang (SWZ), Tianjingyice (TJYC), and Douhetai (DHT) wells located were inferred. Significant variations in CO 2 concentration were observed in soil gases sampled in DHT, HBLG, and WFS soil gas wells in concomitance with a local seismic sequence by 2018 confirming for the first time a possible source of carbon dioxide generated in underlying limestones.

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Section: Discussionmentioning

confidence: 99%

Section: Soil Gas Measurement In Selectedmentioning

confidence: 99%

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Evidence of Multiple Sources of Soil Gas in the Tangshan Fault Zone, North China

Zhi

Liu

et al. 2019

Geofluids

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“…In our study, high concentrations of Rn were primarily found at the XSH fault ( Figure 5D and Table 1), which has the highest stress, fault slip rate, and maximum strain rate in the XXFS ( Figure 8C and Chen., 2006;He and Lu, 2007;Shi et al, 2012;Zhao et al, 2015;Yue et al, 2017;Li et al, 2019). Fault activity can facilitate the transport of fluids due to episodic fracturing events that can release quantities of deep fluids (Evans et al, 1997;Kulongoski et al, 2005;Tanikawa et al, 2010;Zhang et al, 2016).…”

Section: Relationship Between Soil-gas Concentration and Fault Activitymentioning

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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“…Another view is that the heat source is radioactive, generated in the bedrock granite [10], but this lacks relevant evidence. However, helium isotope studies have shown that there is a considerable amount of mantle-derived helium in hot spring water, implying that the formation of deep heat sources is related to the upwelling of mantle-derived materials [2,11]. Seismic reflections have also provided evidence of magma intrusion in the Huailai area [12][13][14], but there is insufficient evidence to show that it is related to the formation of a geothermal system.…”

Section: Introductionmentioning

confidence: 99%

Magmatic Geothermal Genesis Model in the Huailai Area Based on the Constraints of the Crust–Mantle-Scale Geoelectric Structure

et al. 2021

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The Huailai area is rich in geothermal resources, but the formation mechanism of its deep heat source is still unclear. In this paper, based on 16 broadband magnetotelluric sounding points, the two-dimensional electrical structure of the crust and mantle in the Huailai area was obtained. Combined with deep seismic reflection and P-wave seismic tomography, the geophysical characteristics of deep heat sources and reservoirs in the Huailai area are described. The Huailai area is characterized by low resistivity and layered reflection above 2 km in depth, which shows the distribution of the Cenozoic sedimentary cover layer. The upper crust is characterized by high resistivity without an obvious reflector, corresponding to the crystalline basement of the basin, whose main lithology is Archean gneiss. There is a highly conductive and bright-spot-reflective structure under the basement, which extends to 100 km, indicating the upwelling of mantle-derived material. Combined with the results of helium isotope tracing, a magma-type geothermal model in the Huailai area is proposed. The upwelling mantle-derived magma material is enriched under the basement to form a heat source. The heat is transferred to the upper crust through heat conduction along the crystalline basement. Then, groundwater circulation brings deep heat to the surface, forming hydrothermal resources.

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Mantle volatiles in spring gases in the Basin and Range Province on the west of Beijing, China: Constraints from helium and carbon isotopes

Cited by 21 publications

References 68 publications

Evidence of Multiple Sources of Soil Gas in the Tangshan Fault Zone, North China

Evidence of Multiple Sources of Soil Gas in the Tangshan Fault Zone, North China

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

Magmatic Geothermal Genesis Model in the Huailai Area Based on the Constraints of the Crust–Mantle-Scale Geoelectric Structure

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