The application of geophysical exploration results to the investigation of segmented differences of the role of the Ngola Mountain active faulted zone in Qinghai Province in the control of geothermal and seismic activities
WANG Bin1, LI Bai-Xiang2, LI Fu-Cheng1
1. Hydrogeological and Geothermal Geological Key Laboratory of Qinghai Province, Qinghai Institute of Environmental Geological Survey of Hydrogeology and Engineering Geology, Xining 810008, China;
2. No. 2 Institute of Geological Exploration, Bureau of Geology and Mineral Resources of Gansu Province, Lanzhou 730020, China
Through a comparison of the differences between the results obtained by two times of geothermal geophysical exploration conducted in different segments of the Ngola Mountain active faulted zone and on the basis of an analysis of regional gravity field and geological structure, the authors, starting with the study of modern tectonic stress field and tectonic deformation, investigated the segmented differences of the role of the Ngola Mountain active faulted zone in Qinghai Province in the control of geothermal and seismic activities. The southern segment of the faulted zone strikes in NNW direction and intersects the NE-trending stress of the Tibetan Plateau at an acute angle and mainly assumes strike-slip nature under the stress component force; the right-lateral pull-apart area controls the cluster distribution of the warm spring groups and has no intermediate and strong seismic activities. In the northern segment of the faulted zone, The strike turns in NW direction and is nearly perpendicular to the diection of the stress; under the action of compressive stress, the thrust fault is likely to become causative fault, but possesses no conditions for the formation of warm springs and geothermal fields. This paper investigates the formation mechanism of the warm springs and geothermal fields, emphatically describes the good geothermal and geological conditions of the warm springs in Wenquan Town, and also points out that there exists no geological setting for the formation of geothermal fields in the Wulan segment.
王斌, 李百祥, 李福城. 物探成果在探讨青海鄂拉山活动断裂带控热控震的分段差异性中的应用[J]. 物探与化探, 2015, 39(2): 311-317.
WANG Bin, LI Bai-Xiang, LI Fu-Cheng. The application of geophysical exploration results to the investigation of segmented differences of the role of the Ngola Mountain active faulted zone in Qinghai Province in the control of geothermal and seismic activities. Geophysical and Geochemical Exploration, 2015, 39(2): 311-317.