REGIONAL GEOLOGICAL SECTION ALONG GEOPHYSICAL SURVEY LINE 1-SB (EASTERN TRANS-BAIKAL, EASTERN SECTION)

V. V. Zhabin, E. Yu. Goshko, E. V. Mosyagin

Siberian Research Institut of Geology, Geophysics and Mineral Resources, Novosibirsk, Russia

A regional geological cross-section uncovers the structure of the Earth’s crust in the Eastern Trans-Baikal down to more than 20 km along geophysical survey line 1-SB extending from Kaylastuy village to the Tukalama River to a length of 800 km. Its internal structure was studied based on a reflection section, which enabled the structural-material prediction to the granite-gneiss layer top. Magmatic rocks of different composition and age make up almost 80 % of the geological cross-section, forming effusive and numerous intrusive complexes. From the Late Archean till the Middle Jurassic time, the tectonomagmatic events concluded by orogenesis stage, with mainly marine volcanogenic-terrigenous and carbonaceous sediments that accumulated in depressions. The territory covered by the geological cross-section is divided by regional deep faults into structural-material blocks characterised by occurrence of various mineral resources. In general, the geological cross-section study results controvert the idea of expansion of the Korean-Chinese and the Siberian Platforms.

Keywords: Eastern Trans-Baikal, geophysical survey line 1-SB, eastern section, deep geological crosssection, reflection section, internal structure, minerageny.

DOI 10.20403/2078-0575-2017-4-11-22

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