Gamma-ray spectrometry in the field: Radioactive heat production in the Central Slovakian Volcanic Zone

Harley, Thomas L.; Westaway, Rob; McCay, Alistair T.

doi:10.1016/j.jvolgeores.2017.03.009

Cited by 3 publications

(2 citation statements)

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“…With the development of research on thermal reservoir temperature calculations, cationic thermometry has been heavily investigated to assess the thermal reservoir temperature of geothermal resources [14]. Different geothermometry methods have been proposed for water-rock interactions [15] (e.g., silica, isotope, rare gas, and trace element [10,[16][17][18][19][20][21][22]). Depending on the geothermal system, many studies have explored new methods based on the special local hydrogeological conditions to find more effective methods for thermal storage calculations [23,24].…”

Section: Introductionmentioning

confidence: 99%

Reservoir Temperature Calculation and Modeling for Convective Geothermal Systems: Case Study of Five Major Hot Springs in Lushan, Henan, China

et al. 2023

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The thermal storage temperature and water-rock interaction process of the Lushan convective geothermal system (Qinling stratigraphic zonation fracture zone in China) are clarified by using surface cold water and geothermal fluid as the research objects. In this study, a conceptual model of the temperature profile of the geothermal system in the study area was developed using surface temperature inversion, the cation temperature scale, the SiO2 temperature scale method, the mineral equilibrium phase method, the silicon-enthalpy model, the FixAl method, and the Cl-enthalpy model. The inversion temperature at the surface is in the range of 33-39°C, and the temperature difference indicates the direction of the Checun-Lushan fracture. The study area is recharged from atmospheric precipitation, and the temperature of the recharge area is approximately 5.8–7.7°C (the temperature of the alkali field is approximately 10°C), and the recharge elevation is approximately 1200 m. The thermal storage pattern in the study area is near-surface hydrothermal thermal storage transferred to shallow thermal storage and then to deep thermal storage. The near-surface hydrothermal thermal storage temperature is at a constant temperature of 60°C, and the shallow thermal storage temperature is calculated by K-Mg and Li-Mg geothermometers to be between 99 and 112°C. The thermal storage temperature is simulated using the FixAl method, with deviation values ranging from 2.9% to 15.0%. The silicon-enthalpy model calculates the deep thermal storage temperature to be between 181 and 230°C. The mixing ratio of geothermal water in the study area is extremely high, with a cold water mixing ratio of 85.4–94.8%. The home ground fluid temperature was estimated to be approximately 282°C using the Cl-enthalpy model. The main thermally controlled conductivity channel in the study area is the Checun-Lushan fracture zone. The water vapor formed by convection at depth moves upward to approximately 5 km to form a deep thermal reservoir, and this convection and upward movement cause it to mix with cold water from the fracture zone to form a shallow thermal reservoir, which moves to the near-surface, forming a hydrothermal-type reservoir, which is later discharged in the form of a spring. The conceptual model of geothermal system temperature established in this study provides a basis for further development and utilization of Lushan hot springs and provides guidance for future thermal storage temperature calculations of convection-type geothermal systems in uplifted mountains.

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Section: Introductionmentioning

confidence: 99%

Reservoir Temperature Calculation and Modeling for Convective Geothermal Systems: Case Study of Five Major Hot Springs in Lushan, Henan, China

et al. 2023

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“…The latter method is a widely used surveying technique both in rocks and soils (e.g. Frattini et al 2006;Šimíček et al 2012;McCay et al 2014;Puccini et al 2014;Harley et al 2017). In granitic terrains, an advantage of gamma-ray spectroscopy over chemical analysis is the easier mapping and therefore better regional coverage (Gnojek et al 2018;Scharfenberg et al 2019).…”

Section: Introductionmentioning

confidence: 99%

Radiogenic heat production of Variscan granites from the Western Bohemian Massif, Germany

Scharfenberg¹,

Regelous²,

Wall³

2020

Jour. Geosci.

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Much of the Mid-European basement has been consolidated during the Variscan Orogeny and includes large volumes of granitic intrusions. Gamma radiation spectroscopic measurements in three study areas along the western margin of the Bohemian Massif give a record of radiogenic element concentrations in the Variscan granites. Most intrusions of the Fichtelgebirge (except for the Tin Granite) and intrusive complexes in the Bavarian Forest show Th/U ratios exceeding unity, most likely related to abundance of monazite. In contrast, some of the Oberpfalz granites located near the Saxothuringian-Moldanubian boundary (Flossenbürg, Steinwald and Friedenfels types) are characterized by higher uranium concentrations and thus Th/U < 1. The low Th/U ratios here are in agreement with a possible U mobilisation along the Saxothuringian-Moldanubian contact zone observed in previous studies. Heat production rates of granites in the three study areas vary between 3.9 and 8.9 µW/m 3 , with a mean of 4.9 µW/m 3. This classifies the intrusions as moderate-to high-heat-producing granites. Considering the huge volume of granitic bodies in the Variscan crust of the Bohemian Massif, the contribution of in situ radiogenic heat production had to have a major impact and should be considered in further thermal modeling.

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The contribution of Rob Westaway to the study of fluvial archives

Bridgland

2024

Geomorphology

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Gamma-ray spectrometry in the field: Radioactive heat production in the Central Slovakian Volcanic Zone

Abstract: Terahertz channel characterization inside the human skin for nano-scale body-centric networks. IEEE Transactions on Terahertz Science and Technology, 6(3), pp. 427-434.

Cited by 3 publications

References 61 publications

Reservoir Temperature Calculation and Modeling for Convective Geothermal Systems: Case Study of Five Major Hot Springs in Lushan, Henan, China

Reservoir Temperature Calculation and Modeling for Convective Geothermal Systems: Case Study of Five Major Hot Springs in Lushan, Henan, China

Radiogenic heat production of Variscan granites from the Western Bohemian Massif, Germany

The contribution of Rob Westaway to the study of fluvial archives

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