Investigating the Formation of Hot-Dry Rock in Gonghe Basin, Qinghai, China

The Gonghe Basin, Qinghai Province, China, has rich geothermal and hot-dry rock resources. Through a magnetotelluric survey line with 400 points, combined with regional geology data, the deep geoelectrical structural background and thermal source mechanisms of the Gonghe Basin were explored. The res...

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Bibliographic Details
Published in:Minerals (Basel) 2023-08, Vol.13 (8), p.1103
Main Authors: Yang, Yang, Chen, Fangbo, Yu, Siliu, Zheng, Yubin, He, Sujie, Zeng, Yan, Xie, Xiaoli, Zhu, Jie, Luo, Nan
Format: Article
Language:English
Subjects:
Basins (Geology)
Cenozoic
Cenozoic Era
China
Comparative analysis
Conduction heating
Conductivity
Electric properties
Geoelectricity
Geology
Geophysics
geothermal energy
Geothermal power
Geothermal resources
Gonghe Basin
Heat
heat source mechanism
Heat storage
High temperature
hot-dry rock
magnetotelluric
Mountains
Polymorphism
Rocks
Rocks, Sedimentary
Sedimentary rocks
Software
Surveys
Temperature
Triassic
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Summary:The Gonghe Basin, Qinghai Province, China, has rich geothermal and hot-dry rock resources. Through a magnetotelluric survey line with 400 points, combined with regional geology data, the deep geoelectrical structural background and thermal source mechanisms of the Gonghe Basin were explored. The results showed that (1) a deep structure with high conductivity may exist at a depth of 15 km in the basin, and could be compared to the layer-shaped, low-velocity, high-conductivity structure in the eastern part of the Qinghai–Tibet Plateau; (2) the rushing reverse fault played a crucial role in heat control and conduction from the hot field; and (3) high-temperature heat storage existed, including four layers of geothermal resources. This study proposed a triple-polymorphism model of hot-dry rock in the area; that is, the high-conductivity layer in the Middle–Late Cenozoic crust was the principal heat source; the Middle–Late Triassic granite was the essential heat-storing body, as well as a parent rock to the hot-dry rock; and the Cenozoic sedimentary rock was the effective caprock. This model is critical to understanding geothermal causes, predicting geothermal resources, and planning, on the Qinghai–Tibet Plateau.
ISSN:2075-163X
2075-163X
DOI:10.3390/min13081103