| 青藏高原东北缘活动构造与共和盆地高温热异常形成机制 |
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| 关键词:geothermal Gonghe Basin active structure slipping fault high conductivity-lower velocity zone northeastern margin of the Tibetan Plateau |
| 基金项目:国家自然科学基金项目(编号: 41877197; 41602257);中国地质调查局地质调查项目(编号: DD20190132; DD20221677) |
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| Coupling Mechanism of Geothermal Accumulation and the Cenozoic Active Tectonics Evolution in Gonghe Basin, Northeastern Margin of the Tibetan Plateau |
| Tectonic activity is one of the key factors affecting the process of heat transfer to the surface and energy redistribution in the deep earth. High-temperature geothermal resources have been discovered in Gonghe Basin, located at the northeastern margin of the Tibetan Plateau. The source of the heat has historically been the focus of research. In order to understand the impact of tectonic activity on the distribution of geothermal resources, in this study, we performed seismic background noise profile measurement in the area of Gonghe Basin that experiences high-temperature geothermal anomalies. We analyzed the structural properties, activity period, and evolution process of boundary faults, and propose a coupling relationship between Cenozoic tectonic evolution and geothermal anomaly formation based on the characteristics of drilling and geophysical anomalies. The following conclusions were drawn: 1) Gonghe Basin was formed in the sliding subtraction zone of large-scale active left-handed strike-slip action at the Kunlun fault and the Haiyuan fault; 2) since the Cenozoic, Gonghe Basin has experienced two major evolutionary stages: the Miocene (12–6 Ma) rotating panlacusion depression and the Pliocene–Quaternary (6–3 Ma) tension and torsion deformation; 3) the geophysical low-velocity and high-conductivity layer (VS<3.2 km/s, R>10 Ω?m) developed in the upper crust of Gonghe Basin is the dominant heat source; 4) the lithospheric uplift deformation caused by the continuous left-handed strike-slip deformation in the Pliocene is the main driving force for the intrusion of deep thermal energy into the shallow layer, and the heat transport extended at least to 3 Ma; 5) It is assumed that the sub-basin on the northeastern margin of the Tibetan Plateau with tectonic evolution properties similar to those of Gonghe Basin will have conditions for the development of high-temperature geothermal resources. |
| TANG Xian-chun,WANG Gui-ling,ZHANG Dai-lei,MA Yan.2023.Coupling Mechanism of Geothermal Accumulation and the Cenozoic Active Tectonics Evolution in Gonghe Basin, Northeastern Margin of the Tibetan Plateau[J].Acta Geoscientica Sinica,44(1):7-20. |
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