Structural controls on a geothermal system in the Tarutung Basin,north central Sumatra |
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| Institution: | 1. Istituto per la Dinamica dei Processi Ambientali—Sezione di Milano, Consiglio Nazionale delle Ricerche, Milano, Italy;2. Dipartimento di Scienze della Terra e Geoambientali, Università degli Studi di Bari, Bari, Italy;3. Centro de Geociencias, Universidad Nacional Autónoma de México, Querétaro, Mexico;4. Instituto Potosino de Investigación Científica y Tecnológica, San Luis Potosí, Mexico;5. Dipartimento di Scienze della Terra e dell''Ambiente, Università degli Studi di Pavia, Pavia, Italy;1. Faculty of Mining and Petroleum Engineering, Institut Teknologi Bandung, Jalan Ganesa 10, Bandung 40132, Indonesia;2. Faculty of Mathematics and Natural Sciences, Padang State University, Jalan Prof. Dr. Hamka, Padang 25171, Indonesia;3. Research Center for Geotechnology, National Research and Innovation Agency (BRIN), Jalan Sangkuriang, Bandung 40135, Indonesia;1. Key Laboratory of Water Cycle and Water Security in Southern China of Guangdong High Education Institute, Center for Water Resources and Environment, Sun Yat-sen University, Guangzhou 510275, PR China;2. Key Laboratory of the Three Gorges Reservoir Region''s Eco-Environment, Ministry of Education, School of Geographical Sciences, Southwest University, Chongqing 400715, PR China;3. Research Institute of Exploration and Development of Qinghai Oil Field Company, China National Petroleum Corporation, Dunhuang 736202, PR China;4. Institute of Karst Geology, Chinese Academy of Geological Sciences, Guilin 541000, PR China;1. Department of Geological Engineering, GadjahMada University, Jl. Grafika No. 2, Yogyakarta 55281, Indonesia;2. Department of Earth Resources Engineering, Faculty of Engineering, Kyushu University, Fukuoka 819-0395, Japan;3. Department of Earth Science and Technology, Akita University, Akita, Japan |
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| Abstract: | The Sumatra Fault System provides a unique geologic setting to evaluate the influence of structural controls on geothermal activity. Whereas most of the geothermal systems in Indonesia are controlled by volcanic activity, geothermal systems at the Sumatra Fault System might be controlled by faults and fractures. Exploration strategies for these geothermal systems need to be verified because the typical pattern of heat source and alteration clays are missing so that conventional exploration with magnetotelluric surveys might not provide sufficient data to delineate favorable settings for drilling. We present field geological, structural and geomorphological evidence combined with mapping of geothermal manifestations to allow constraints between fault dynamics and geothermal activity in the Tarutung Basin in north central Sumatra. Our results indicate that the fault pattern in the Tarutung Basin is generated by a compressional stress direction acting at a high angle to the right-lateral Sumatra Fault System. NW–SE striking normal faults possibly related to negative flower structures and NNW-SSE to NNE-SSW oriented dilative Riedel shears are preferential fluid pathways whereas ENE–WSW striking faults act as barriers in this system. The dominant of geothermal manifestations at the eastern part of the basin indicates local extension due to clockwise block rotation in the Sumatra Fault System. Our results support the effort to integrate detailed field geological surveys to refined exploration strategies even in tropical areas where outcrops are limited. |
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| Keywords: | Sumatra Fault System Geothermal field based exploration Tarutung Basin Fault controlled geothermal systems Fault pattern analysis |
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