| Citation: |
KANG Lei, LIU Shengrong, ZHANG Haidi, WANG Guocan, GUO Weili, LUO Yanjun, REN Guangli, LYU Pengrui, CAO Kai. 2023. Exploration of 1:50000 geological mapping in Gobi desert shallow covered area: a practice in Hami area of East Tianshan. Geological Bulletin of China, 42(4): 616-630. doi: 10.12097/j.issn.1671-2552.2023.04.010
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Exploration of 1:50000 geological mapping in Gobi desert shallow covered area: a practice in Hami area of East Tianshan
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Abstract
In order to better serve the construction of ecological civilization and high-quality economic and social development, geological mapping is urgently needed to be expanded from the bedrock area to covered area containing the basin-mountain combination zone and basin cover areas.Gobi desert shallow covered area is the key for investigating water, prospecting in hidden areas, and studying basin base properties, basin-mountain tectonic relationships and evolution in the midde-small cities and margin of metropotis of North China.However, there has been lack of systematic geological mapping techniques and methods for Gobi desert shallow covered area.In this paper, taking the Gobi desert shallow cover area in the joint part of Jueluotage Mountain and Turpan-Hami Basin in Hami area of East Tianshan Mountains as an example, using multiple technical methods such as geology, geophysics, remote sensing and drilling, and adopting the idea from "known" to "unknown", the geological mapping technology method which consist of the content, method, technical means of geological survey and achievement expression is systematically summarized.In particular, on the basic of experiment and practice, for different cover depth, different cover structure and different geological and mineral targets, the combination of geophysical and drilling technology were summed up on the main evaluation indicators of applicability, economy and resolution.Moreover, by GeoModeller software, the technical method of 3D geological structure modeling was explored in Gobi desert cover.Through the above work, a three-dimensional and transparent geological survey technology and method system has been established from the surface, the overburden and the bedrock, and the geological structure and its metallogenic geological background have been identified, which fully meet the expected goal of 1:50000 regional geological mapping in Gobi desert shallow covered area.At the same time, it provides important information for the nature of the Dacaotan fault zone, the structural evolution of the Turpan-Hami Basin, and the basement nature of the Turpan-Hami Basin.
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References
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KANG Lei, LIU Shengrong, ZHANG Haidi, WANG Guocan, GUO Weili, LUO Yanjun, REN Guangli, LYU Pengrui, CAO Kai. 2023. Exploration of 1:50000 geological mapping in Gobi desert shallow covered area: a practice in Hami area of East Tianshan. Geological Bulletin of China, 42(4): 616-630. doi: 10.12097/j.issn.1671-2552.2023.04.010
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Figure 1.
Distribution of different of coverage areas in China and study area
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Figure 2.
Geological and geomorphological characteristics of the Gobi desert in Hami area, East Tianshan
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Figure 3.
Physical parameters of main rock types in the Hongqiuling sheet in Hami area
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Figure 4.
Physical property parameters of main stratigraphic mapping units in the Hongqiuling sheet in Hami area
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Figure 5.
3D morphological map of the pre-Mesozoic bedrock surface(bottom of overburden)in Hami area
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Figure 6.
Depth map of bedrock top and cover bottom of Yandun block in Hami area, according to gravity and magnetic data
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Figure 7.
The shallow reflection seismic section which revealing the thickness, structure of cover and bedrock distribution in the Hongqiuling sheet of Hami area
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Figure 8.
High-density electrical section and drilling verification which showing the thickness and structure of cover in the Hongqiuling sheet of Hami area
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Figure 9.
Two-dimensional NLCG inversion electrical structure model of the MT sounding profile in Weiya-Namiaoergou, East Tianshan
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Figure 10.
Faults inferred map according to the linear feature of the gravity anomaly(a) and aeromagnetic anomaly(b)in the Hongqiuling sheet of Hami area
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Figure 11.
Expression of surface geological map
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Figure 12.
Representation of the bedrock geological map
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Figure 13.
Schematic diagram of 3D geological structure modeling for Changgan River sheet by GeoModeller software in Hami area