Hydrogeochemical Characteristics and Genesis of Medium-High Temperature Geothermal System in Northeast Margin of Pamir Plateau

被引：0

作者：

Zhao, Boyuan ^{[1
]}

Wang, Shuai ^{[2
]}

Chen, Feng ^{[3
]}

He, Genyi ^{[3
]}

Huang, Xuelian ^{[4
]}

Wang, Sijia ^{[1
]}

Qi, Shihua ^{[1
,4
]}

机构：

[1] State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan

[2] School of Earth Resources, China University Geosciences, Wuhan

[3] Second Hydrogeological and Engineering Geological Team of Xinjiang Bureau of Geology and Mineral Resources Exploration and Development, Changji

[4] School of Environmental Studies, China University of Geosciences, Wuhan

来源：

Diqiu Kexue - Zhongguo Dizhi Daxue Xuebao/Earth Science - Journal of China University of Geosciences | 2024年 / 49卷 / 10期

关键词：

geothermometer; high radioactive granite; hydrochemistry; hydrogeology; medium-high temperature geothermal system; Pamir plateau;

D O I：

10.3799/dqkx.2023.081

中图分类号：

学科分类号：

摘要：

The northeast margin of Pamir tectonic junction is enriched with medium-high temperature geothermal resources. Most previous studies are limited to a single geothermal field and lack of regional systematic research. Here,it applies geothermal hydro-geochemistry as an effective method to study geothermal resources. Based on the geothermal geological characteristics of the northeast margin of the Pamirs Plateau, the hydrochemical genesis, characteristics and isotope analysis of 8 hot spring water, 1 cold spring water, 11 hot well water and 6 surface water in the study area were analyzed and revealed the evolution characteristics of regional geothermal fluid thermal reservoir and cooling mechanism in the northeast of Pamir. It provides a certain geochemical basis for the exploration of geothermal resources in the northeast of Pamir. The results show that the major ions in geothermal water are mainly originated from sodium/potassium feldspar, cation exchange and magmatic water. The high correlation of ratio in B/Cl、B/Li、B/Cs、Li/Cs、Na/Cl、K/Cl shows that hot water probably has a common parent geothermal fluid. The characteristics of hydrogen and oxygen isotopes indicate that geothermal water is recharged by atmospheric precipitation, snowmelt water and deep magmatic water. A variety of solute thermometers, silicon-enthalpy model and chlorine-enthalpy model were used to reconstruct the geothermal reservoir temperature, cooling process and evolution mode of geothermal groundwater. It inferred that there may be multiple thermal reservoirs under the study area, which the temperature of the deepest parent geothermal fluid storage is about 358-418 °C with the Cl- concentrations about 300-400 mg/L. Combined with regional geology and geothermal geological conditions analysis, it believes the geothermal anomaly in the northeast margin of the Pamir Plateau is a result of uncooling magma in the crust and high radioactive granite. © 2024 China University of Geosciences. All rights reserved.

引用

页码：3736 / 3748

页数：12

共 35 条

[1] Arnorsson S., The Use of Mixing Models and Chemical Geothermometers for Estimating Underground Temperatures in Geothermal Systems, Journal of Volcanology and Geothermal Research, 23, 3-4, pp. 299-335, (1985)
[2] Bershaw J., Garzione C. N., Schoenbohm L., Et al., Cenozoic Evolution of the Pamir Plateau Based on Stratigraphy, Zircon Provenance, and Stable Isotopes of Foreland Basin Sediments at Oytag (Wuyitake) in the Tarim Basin (West China), Journal of Asian Earth Sciences, 44, pp. 136-148, (2012)
[3] Bloch W., Schurr B., Yuan X. H., Et al., Structure and Stress Field of the Lithosphere between Pamir and Tarim, Geophysical Research Letters, 48, 22, (2021)
[4] Brown L., Zhao W., Nelson K., Et al., Bright Spots, Structure, and Magmatism in Southern Tibet from IN-DEPTH Seismic Reflection Profiling, Science, 274, 5293, pp. 1688-1690, (1996)
[5] Chen J., Li T., Li W.Q., Et al., Late Cenozoic and Present Tectonic Deformation in the Pamir Salient, Northwestern China, Seismology and Geology, 33, 2, pp. 241-259, (2011)
[6] Craig H., Isotopic Variations in Meteoric Waters, Science, 133, 3465, pp. 1702-1703, (1961)
[7] Fan Y., Pang Z., Liao D., Et al., Hydrogeochemical Characteristics and Genesis of Geothermal Water from the Ganzi Geothermal Field, Eastern Tibetan Plateau, Water, 11, 8, (2019)
[8] Feng F., Li Z.Q., Jin S., Et al., Characteristics of δ<sup>18</sup>O and δD in Precipitation and Its Water Vapor Sources in the Upper Urumqi River Basin, Eastern Tianshan, Advances in Water Science, 24, 5, pp. 634-641, (2013)
[9] Fournier R. O., Chemical Geothermometers and Mixing Models for Geothermal Systems, Geothermics, 5, 1-4, pp. 41-50, (1977)
[10] Fournier R. O., Truesdell A. H., An Empirical Na-K-Ca Geothermometer for Natural Waters, Geochimica et Cosmochimica Acta, 37, 5, pp. 1255-1275, (1973)

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