| 青海共和盆地岩石圈热-流变结构及地热意义 |
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| 关键词:heat flow crustal thermal structure deep temperature thermal-rheological structure intracrustal low-velocity body |
| 基金项目:中国地质调查局地质调查项目(编号: DD20221676-4);青海省清洁能源矿产专项(编号: 2022013004qj004) |
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| Lithospheric Thermal-rheological Structure and Geothermal Significance in Gonghe Basin, Qinghai Province |
| The thermal condition of the Earth at depth is an important element in the study of deep geodynamics and lithospheric activity, and the lithospheric thermal structure and thermal-rheological structure can well reveal the thermal condition in the lithospheric range. In recent years, drilling activities in Qinghai Gonghe Basin have revealed deep high-temperature hot dry rocks, about which the heat source mechanism has not been conclusively established. In this paper, we take Gonghe Basin in Qinghai as the research object, analyze the intracrustal temperature distribution and rheological intensity, and explore the geological properties of the intracrustal low-velocity body. The results show that the crustal rheological structure of Gonghe Basin is divided into brittle and ductile layers from top to bottom, and the ductile layer includes two ductile layers, the middle crust and the lower crust, all of which show mainly brittle rupture at the upper crustal scale and gradually transition to ductile rheology. In the Qiaboqia region, when the brittle rupture of the upper crust extended to the middle and lower crust, the rupture occurred along a series of slip surfaces with ductile sliding, and intracrustal melting was formed in local sections, which provided additional heat source for the Qiaboqia region and made its geothermal heat flow value (109.6 mW/m2) significantly higher than that of the Guiade region (77.6 mW/m2). This understanding provides new evidence for the existence of low-velocity bodies in the crust of Gonghe Basin, and also provides a scientific basis for the analysis of heat sources of hot dry rocks in the region and the exploration and development of high-temperature geothermal resources. |
| LIN Wen-jing,GAN Hao-nan,ZHAO Zhen,ZHANG Sheng-sheng.2023.Lithospheric Thermal-rheological Structure and Geothermal Significance in Gonghe Basin, Qinghai Province[J].Acta Geoscientica Sinica,44(1):45-56. |
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