Палеопотамология плейстоценовых отложений в Баргузинской долине (Байкальская рифтовая зона)

Абдулмонем Исса Хассан; Владимир Леонидович Коломиец; Сергей Васильевич Рассказов; Ринчин Цыбикжапович Будаев; Ирина Сергеевна Чувашова; Хамуд Аль  Аднан

doi:10.17308/geology.2019.4/2694

Authors

Abdulmonem Issa Hassan Irkutsk State University, Irkutsk Al-Baath University
V. L. Kolomiets Geological Institute SB RAS, Banzarov Buryat State University
S. V. Rasskazov Institute of the Earth’s Crust, Siberian Branch of RAS, Irkutsk State University
R.Ts. Budaev Geological Institute SB RAS
I. S. Chuvashova Institute of the Earth’s Crust, Siberian Branch of RAS, Irkutsk State University
Al Hamoud Adnan Irkutsk State University, Al-Furat University

DOI:

https://doi.org/10.17308/geology.2019.4/2694

Keywords:

Baikal, Barguzin Valley, Pleistocene, lithogenesis, granulometric analysis, sands, alluvial sediments, lacustrine sediments

Abstract

this article presents the results of granulometric study of a 527-meter thick Upper Kuytun sedimentary section: 172 m of natural outcrop and 355 m of core material from a drill hole. The section exhibits the lower rhythmic pebble–sandy and upper sandy stratums. The former accumulated in Barguzin Valley during a rapid (uncompensated by sedimentation) subsidence of the Lake Baikal bed. The latter formed due to specific regime of sediment accumulation that occurred before the Tyya tectonic phase of relief structural reorganization at the end of the Middle Neopleistocene. From paleopotamological analysis of data obtained, we infer that the sandy stratum accumulated in shallow flow lacustrine reservoirs with weak waves and bottom currents (subhorizontally-layered siltstones and fine-grained sands of coastal and littoral facies of lakes), as well as progressive immobile river flows with retaining, slowed- down movement of water (fine-medium-grained sands with oblique and floodplain facies of rivers).

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Author Biographies

Abdulmonem Issa Hassan, Irkutsk State University, Irkutsk Al-Baath University

Graduate student ISU Geological Faculty, Assistant Department of Geology, Faculty of Science
V. L. Kolomiets, Geological Institute SB RAS, Banzarov Buryat State University

Candidate of the Geological and Mineralogical Sciences, Senior Researcher, Associate Professor
S. V. Rasskazov, Institute of the Earth’s Crust, Siberian Branch of RAS, Irkutsk State University

Head of the Department of dynamic geology, Doctor of Geological and Mineralogical Sciences, Head of Laboratory for Isotopic and Geochronological Studies
R.Ts. Budaev, Geological Institute SB RAS

Candidate of the Geological and Mineralogical Sciences , Senior Researcher
I. S. Chuvashova, Institute of the Earth’s Crust, Siberian Branch of RAS, Irkutsk State University

Candidate of the Geological and Mineralogical Sciences, associate professor, Department of dynamic geology, Senior Researcher
Al Hamoud Adnan , Irkutsk State University, Al-Furat University

Graduate student ISU Geological Faculty. Assistant Department of Geology, Faculty of Science, Al-Furat University