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Basement attribute of western Weihe Basin based on MT and gravity data |
Xiao-Gang ZHU1, Bing-Qiang YUAN1, Xu-Liang FENG1, Kai-Tuo GU2, Chun-Guan ZHANG1, Yu-Hong LI3, Liang WANG1, Hai-Ping WANG1, Peng-Fei ZHENG1, Zu-Xin LI4 |
1. College of Geosciences and Engineering,Xi’an Shiyou University,Xi’an 710065,China 2. Shaanxi Academy of Geological Survey,Xi’an 710014,China 3. Bureau of Xi’an Geological Survey,China Geological Survey,Xi’an 710054,China 4. College of Software, Northwestern Polytechnical University,Xi’an 710072,China |
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Abstract The structure in the west of the Weihe Basin is complex. At present, there are different views on the basic geological problems in such aspects as the division of the tectonic units, the characteristics of stratigraphic development and the properties of basement. In this study, the distribution characteristics and basement properties of the sedimentary strata in the western part of Weihe Basin were inferred by using four newly implemented magnetotelluric (MT) sounding profiles in Baoji area, in combination with the gravity data and through the comprehensive interpretation of gravity and electricity. The results show that, along the route from Longxian to Fengxiang, the resistivity anomaly is low, the gravity is high, the Cenozoic sediments are thin, and the basement is shallow. The Cretaceous strata are exposed in some areas, and the basement of the area is dominated by the Mesozoic strata. In Qianyang area, there are high resistivity value and high gravity value, and the surface outcrop is complex. There exist Cambrian, Ordovician, Triassic, Cretaceous, Jurassic and some other strata, and the basement is composed of Mesozoic-Paleozoic-Proterozoic strata. In the west of Fufeng, south of Qishan, the resistivity value drops sharply from the north and south sides, and the basement is assumed to be composed of metamorphic rocks. The northern part of Baoji to Meixian area is characterized by high resistivity and gravity, and the northern part of Baoji to Meixian area has partly exposed Cretaceous strata with Paleozoic-Proterozoic basement. The south of Baoji to Meixian area is characterized by high resistivity and low gravity. There is a large area of granite outcrops, with the basement composed of granite.
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Received: 18 March 2019
Published: 22 April 2020
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Geological map of western Weihe Basin (According to the 1∶500000 geological map revised by Shaanxi Geological Survey Institute)
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Map of Bouguer gravity anomaly in western Weihe Basin
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地层 | 岩石 名称 | 标本 体块 | 密度/(103 kg·m-3) | 电阻率/ (Ω·m) | 变化 范围 | 界/系密度均值 | 新生界 | 第四系 | 土壤大样 | 80 | 1.52~1.72 | 1.64 | 1.64 | 2.22 | >8 | 新近系 | 砂岩 | 180 | 2.04~2.58 | 2.39 | 2.40 | 1~8 | 古近系 | 砂岩 | 90 | 2.23~2.66 | 2.42 | 中生界 | 砂岩 | 600 | 2.29~2.76 | 2.52 | >10 | 古生界 | 砂岩、页岩、灰岩 | 1230 | 2.48~2.88 | 2.72 | | 元古界 | 白云岩、变质岩 | 340 | 2.71~2.94 | 2.73 | | 太古界 | 片麻岩、石英片岩 | 60 | 2.55~2.74 | 2.69 | |
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Statistical table of physical characteristics of Weihe Basin
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Map of aeromagnetic anomaly reduced to the pole in western Weihe Basin
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Plane position distribution map of MT sounding profile (According to the 1∶500 000 geological map revised by Shaanxi Geological Survey Institute)
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Comprehensive interpretation map of DD2017-1 profile in Weihe Basin
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Comprehensive interpretation map of DD2017-2 profile in Weihe Basin
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Comprehensive interpretation map of DD2017-3 profile in Weihe Basin
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Comprehensive interpretation map of DD2018-1 profile in Weihe Basin
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Basement distribution map in western Weihe Basin
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