The spatial prediction of geothermal sites along the southeast side of Taihang Mountain in the Tangyin rift is a critical goal in the development of renewable energy resources in cities such as Hebi in Henan province,which has significant potential for geothermal energy production due to the existence of deep faults and Cenozoic volcano.The study aimed to delineate areas with high geothermal manifestations for detailed geothermal exploration and well-test drilling.To define favorable zones for geothermal potentiality,multi-source datasets were chosen to generate evidence thematic layers that demonstrate the distribution of geothermal anomalies such as geologic maps,structural maps,Land Surface Temperature maps(LST),and hydrothermal mineral alterations maps.The remote sensing and Geographical Information System(GIS)approaches were integrated to map fossil geothermal manifestations and appraise the promising geothermal zones from Landsat 8 OLI/TIRS and Advanced Spaceborne Thermal Emission and Reflection Radiometer-Digital Elevation Model(ASTER-DEM)dataset using the Analytic Hierarchy Process(AHP),which is one of the Mult-criteria Decision Making methods.Results show LST values ranging from 22.6℃to 45.4℃,with the highest values found along the faults and volcanic areas.The hydrothermal alteration minerals discriminated from band ratios of 4/2,6/5,and 6/7 for iron oxide,ferrous minerals,and clays reveal the presence of high amount of montmorillonite and illite minerals along the faults and volcanoes which are related to hot fluid circulation from subsurface.Structural analysis shows that the major structural trend follows the NNNE Tangdong and Tangxi faults,with high density on the west side of the Tangxi fault where there is good exposure of outcrop but less fault density on the east side due to sedimentation in a low land which may conceal geological structures.Lastly,all the thematic layers of geothermal factors were reclassified,ranked,and integrated by the weight overlay logic model based on the influence of geothermal suitability to map potential areas for geothermal resources whereby 5 zones were obtained ranging from very poor to very good.The promising potential sites are mostly found along the highly deep structures of the major Tangxi fault crosscutting the permeable lithology of carbonate rocks and around the Hebi volcanoes.The distribution of hot springs and geothermal wells of the Hebi field were correlated and verified against the potential geothermal anomalies map.The overall integrated method proposes an advanced technique for designing the Tangyin rift's exploration plan and development actions for geothermal resources utilization,which can be used for exploration of any unveiling geothermal potential sites.

MAHWA Joshua;LI Da-jiang;PING Jian-hua;LENG Wei;TANG Jia-bo;SHAO Dong-yun

School of Water Conservancy and Engineering,Zhengzhou University,Zhengzhou 450001,China;Department of Geology,College of Earth Science,University of Dodoma,Box 11090,Dodoma,Tanzania;Power China Henan Engineering CO.,LTD,No.30 Changchun Road,High and New Technology Industries Development Zone,Zhengzhou 450001,China;Geothermal and Ecological Geology Research Centre,Zhengzhou University,Zhengzhou 450001,China;College of Ecology and Environment,Zhengzhou University,Zhengzhou 450001,China;Power China Geothermal Development CO.,LTD,No.30 Changchun Road,High and New Technology Industries Development Zone,Zhengzhou 450001,China

山地科学学报（英文版）

[1]MAHWA Joshua;LI Da-jiang;PING Jian-hua;LENG Wei;TANG Jia-bo;SHAO Dong-yun-.Mapping the spatial distribution of fossil geothermal manifestations and assessment of geothermal potential of the Tangyin rift,Southeast of Taihang Mountain in China)[J].山地科学学报（英文版）,2022(08):2241-2259

Tangyin,Hebi,Spaceborne,Mult,NNNE,Tangdong,Tangxi,conceal

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