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Li J.-Y.,Chinese Academy of Geological Sciences | Qu J.-F.,Chinese Academy of Geological Sciences | Zhang J.,Chinese Academy of Geological Sciences | Liu J.-F.,Chinese Academy of Geological Sciences | And 19 more authors.
Geological Bulletin of China | Year: 2013

This paper briefly states new developments in research and investigations on crustal tectonic framework of the Northern China orogenic regions financially supported by China Geological Survey in the last three years, which include the temporal and spatial distributions of re-confirmed Pre-Nanhuanian continental blocks in the region, new data on some major hot-debated geological issues, and new viewpoints on the crustal tectonic framework, orogenic processes and metallogenic geological settings. And finally, some major issues open to be further studied on the crustal framework and metallogenic geological settings in the region are listed.


Fan T.,China Coal Research Institute | Yu F.,Xian Center Geological Survey
2011 International Conference on Remote Sensing, Environment and Transportation Engineering, RSETE 2011 - Proceedings | Year: 2011

It is usually considered that TEM detection which uses the signal of secondary induction field is influenced little by the topography. In fact, with many years' production practice, we find that the influence of topography should not be neglected. TEM exploration in the coal resources, with the coal seam shallow buried, is influenced more by the topography. In this paper, firstly, with the commonly used depth calculation formula in the coal field, we calculate the influence degrees of topography variation on induced electromotive force and attenuation time separately. Then, substitute the two influencing factors into the parameters and calculate new apparent resistivity. According to the new apparent resistivity calculation depth, a set of practical topographical correction methods about the coal measure strata will be obtained. The theoretical model and actual data have proved the effectiveness of this method and software. © 2011 IEEE.

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