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Cenozoic palaeoenvironmental and tectonic controls on the evolution of the northern Fergana Basin

By
Alejandro Bande
Alejandro Bande
1
Universität Potsdam, Institut für Erd- und Umweltwissenschaften, Karl-Liebknecht-Strasse 24, 14476, Potsdam, Germany
3
Present address: Tecpetrol S.A., Della Paolera 299, C1001, Buenos Aires, Argentina
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Shukhrat Radjabov
Shukhrat Radjabov
2
Geological Faculty, NUUz, Vuzgorodok, 100174, Tashkent, Uzbekistan
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Edward R. Sobel
Edward R. Sobel
1
Universität Potsdam, Institut für Erd- und Umweltwissenschaften, Karl-Liebknecht-Strasse 24, 14476, Potsdam, Germany
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Tatyana Sim
Tatyana Sim
2
Geological Faculty, NUUz, Vuzgorodok, 100174, Tashkent, Uzbekistan
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Published:
January 01, 2017

Abstract

The least well-documented intramountain basin within the Tien Shan is the Fergana Basin. Cenozoic deformation is localized along thrusts on the northern and southern flanks, and by transpressive deformation associated with the dextral Talas–Fergana Fault on the eastern margin. We use sedimentological and stratigraphic observations from well-exposed Cenozoic outcrops to describe depositional environments, provenance and sources. These results are combined with interpreted seismic reflection lines and geological cross-sections are extended laterally based on outcrop geology to the north and east. Following a tectonically quiet early Cenozoic period, a progressive change in palaeocurrent indicators suggests Oligo-Miocene uplift of the hinterland, coupled with an increase in higher energy facies in the Massaget Formation. A renewed pulse of deformation tilted Massaget strata and deposited a considerable volume of coarse sedimentary rocks (Baktriy Formation). The younger episode moved progressively basinwards, as imaged by growth–strata relationships in the subsurface. Published work shows that the accumulation of an impressive c. 8 km of Cenozoic deposits cannot be accommodated only by lithospheric flexure produced by a tectonic load. We agree with the hypothesis that the thick sediments preserved in the basin are accommodated by lithospheric folding and propose that this is driven by compression associated with south-vergent Pamir subduction.

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Geological Society

Geological Evolution of Central Asian Basins and the Western Tien Shan Range

M.-F Brunet
M.-F Brunet
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T. McCann
T. McCann
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E. R. Sobel
E. R. Sobel
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Geological Society of London
Volume
427
ISBN electronic:
9781862399594
Publication date:
January 01, 2017

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