Deep structure of the Ulaanbaatar area (Mongolia) from the gravimetric data

Литосфера

E. Kh. Turutanov¹  B. . Buyantogtokh²  N. . Arvisbaatar³ 

[1] Institute of the Earth’s Crust SB RAS;Research Center of Astronomy and Geophysics MAS;School of Physics and Electronics, National University of Mongolia;

关键词: Монголия;    аномалия силы тяжести;    осадочные отложения;    гранитный массив;    Mongolia;    gravity anomaly;    sedimentary deposits;    granitoid massif;   

DOI  :  

来源: DOAJ

【 摘 要 】

The medium-scale gravity survey over the Ulaanbaatar area (Central Mongolia) has yielded the Bouguer gravity anomaly map. Based on interpretation of these data, 3D models have been built for large density inhomogeneities in the Earth’s crust - Ulaanbaatar (Tola) depression and Bogdo granite massif. It has been identified that the basement of the depression has a block structure and complicated by two basins: western and central (Selbe) The sediment thickness averages about 150 m in the western basin and may reach 300 m in the Selbe. The thickness of granitoids in the Bogdo massif reaches 4.5 km, the area of its projection on the earth's surface is twice the area of the exits. The data on the form and dimensions of these density inhomogeneities may be used in engineering seismology to update seismic hazard estimates for the town of Ulaanbaatar and to conclude about the prospects for metallogenic specialization of granitoids whose features concerning some minerals are related to peculiar massif form and identified by geological-geophysical and geochemical studies.

【 授权许可】

Unknown