| 西藏古堆地热田水热蚀变类型、分布特征及对勘探方向的启示 |
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| 关键词:Gudui hydrothermal alteration alteration zonation sinter |
| 基金项目:第二次青藏高原综合科学考察研究(编号: 2019QZKK0804);国家自然科学基金项目(编号: U21A2015);西藏自治区重点研发计划项目(编号: XZ202101ZY0014G)及中国石化科研项目(编号: P21083) |
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| Types, Distribution Characteristics, and Exploration Direction of Hydrothermal Alteration in Gudui Geothermal Field, Tibet |
| As the results of water-rock interaction and geothermal fluid chemical deposition, the hydrothermal alteration and sinter can provide important information to research on hydrothermal activity history, geothermal fluid temperature, and water-rock interaction process. The Gudui geothermal field, located in the central Cone–Oiga rift, is a shallow buried high-temperature geothermal field with the greatest power generation potential in China after Yangbajing geothermal field, and has great development potential. In order to analyze the type and distribution characteristics of sinter and hydrothermal alteration, favorable exploration direction in Gudui geothermal field, and the coupling relationship between hydrothermal deposition and regional tectonic; based on geothermal geological investigation, microscopic identification, and scanning electron microscope analysis, identified hydrothermal alterations such as chloritization, silicification, kaolinization, and carbonation. The hydrothermal alteration in Gudui geothermal field exhibits obvious hydrothermal alteration zonation, which extends from acidic alteration to weak acidic-neutral alteration, and the alteration center is mainly composed of extensively altered silicification or kaolinization zones. The distribution of hydrothermal alteration is controlled by fault, and the alteration center, which is mainly located in the junctions of faults, extends along the faults. The distribution and intensity of hydrothermal alteration implies that the Buxionglanggu and Shagalangga have enormous resource potential. Therefore, geothermal exploration in Gudui geothermal field should focus on the Bushonglanggu and Shagalanga. In terms of hydrothermal deposition, the west area of Gudui geothermal field is dominated by travertine, and the east area is dominated by travertine and geyserite. Furthermore, combined with the dynamic background of Qinghai–Tibet Plateau, an obvious coupling relationship exists between hydrothermal history and the uplift of Qinghai–Tibet Plateau during continent-continent collision and the activity of the Cone–Oiga rift. |
| MENG Hui-ren,CAO Rui,CHEN De-fan,NGAWANG Gyatso,LUO Wen-xing,CAI Yong-qiang,YAN Yi-ming.2023.Types, Distribution Characteristics, and Exploration Direction of Hydrothermal Alteration in Gudui Geothermal Field, Tibet[J].Acta Geoscientica Sinica,44(1):158-168. |
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