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.