Abstract
The paper are the preliminary results of the study of the hydrothermal system of Khulj, which is located in Mogod soum of Bulgan aimag, carried out using magnetotelluric and magnetic methods. Khulj’s hydrothermal system is an interesting geodynamic structure located in the area of a young volcanic mountain in the eastern part of the Khangai Mountains. The study was carried out using two geophysical methods. The first is the magnetotelluric measurement, which registered variations of 3 components of magnetic field (Bx, By, Bz), and 2 components of electric field (Ex, Ey). In addition, we have provided a total of 8 magnetic field profiles for an area of 4 x 8 km. The sample rate of the total magnetic field was 3 seconds, which corresponds to about 3 meters. The programme’s codes are written in C ++ and Matlab and the result of this code is a programme called INV2DMAG. This programme is based on the inversion method of the Levenberq-Marquardt algorithm. Magnetotelluric results show that one-dimensional models clearly display the depth, the thickness of precipitation, as well as the thickness of the Moho boundaries. A preliminary two-dimensional magnetic structure, determined from small-length profiles, provides very useful insight into understanding the shallow deep structure of the sedimentary soil of the region in and around Mogod. In the Mogod’s hydrothermal system, we expect that the hot fluid heats up from granites, which have a deep source.For a detailed research, repeat field measurement is required to determine not only the structure of this geothermal system but also to determine the depth of the sedimentary soil.
Highlights
The Khangai Mountain ranges in central Mongolia are an intra-continental mountain range (2 km above sea level) stretching from the Siberian and the Indo-Asian tectonic plate margins
Geological history of the existence of numerous hot springs in and around the Khangai Mountains is indicative of a large hydrothermal system, and the hot springs are remnants of its volcanic geology history, which are the results of mantle-driven uplift from beneath the Khangai Mountains [1, 2, 3, 5]
Field settings In recent studies, most of their authors have concluded that the far field effect of the Indo-Asia collision is the main factor driving mountain growth in Mongolia [9, 10]
Summary
The Khangai Mountain ranges in central Mongolia are an intra-continental mountain range (2 km above sea level) stretching from the Siberian and the Indo-Asian tectonic plate margins. Since 2016, magnetotelluric studies have been carried out in the central part of Mongolia, especially in the Khangai Mountain area, and some unexpected results have been obtained related to the geodynamic process of the Khangai Mountain ranges. Comprehensive geophysical surveys were successfully carried out in the Mogod seismic area [1, 2], but it only focused on the shallow depth of the Earth layers (about 50 m). It could not determine or identify any source effect such as geodynamic and geotectonic evolutions. We need to conduct another geophysical study in the area
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