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Structure and evolution of the Bukhara-Khiva region during the Mesozoic: The northern margin of the Amu-Darya Basin (southern Uzbekistan)

By
Dmitriy Mordvintsev
Dmitriy Mordvintsev
1
Sorbonne Universités, UPMC Université Paris 06, CNRS, Institut des Sciences de la Terre de Paris, 4 place Jussieu, 75005 Paris, France
2
Institute of Geology and Geophysics of the Academy of Sciences of the Republic of Uzbekistan, Olimlar 49, 100041, Tashkent, Uzbekistan
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Eric Barrier
Eric Barrier
1
Sorbonne Universités, UPMC Université Paris 06, CNRS, Institut des Sciences de la Terre de Paris, 4 place Jussieu, 75005 Paris, France
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Marie-Françoise Brunet
Marie-Françoise Brunet
1
Sorbonne Universités, UPMC Université Paris 06, CNRS, Institut des Sciences de la Terre de Paris, 4 place Jussieu, 75005 Paris, France
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Christian Blanpied
Christian Blanpied
3
TOTAL S.A., Tour Coupole, 2 Place Jean Millier – La Défense 6, 92078 Paris La Défense Cedex, France
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Irina Sidorova
Irina Sidorova
2
Institute of Geology and Geophysics of the Academy of Sciences of the Republic of Uzbekistan, Olimlar 49, 100041, Tashkent, Uzbekistan
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Published:
January 01, 2017

Abstract

The Bukhara-Khiva region forms the northern margin of the Mesozoic Amu-Darya Basin. We reconstructed several cross-sections across this margin from subsurface data. The objectives included examining the structure of the Bukhara and Chardzhou steps and determining the tectonic–sedimentary evolution of the basin during the Jurassic. Subsequent to the Cimmerian collision in the Middle Triassic, an extensional event controlled the deposition of the Early–Middle Jurassic siliciclastic succession in the Bukhara-Khiva region. The main Late Palaeozoic inherited structures were reactivated as normal faults during this period. Continental coarse-grained siliciclastic sediments are mainly confined to the basal Lower Jurassic section, probably Pliensbachian–Toarcian in age, whereas marine siliciclastic sediments occur in the early Late Bajocian. In the Early–Middle Jurassic the Bukhara and Chardzhou steps were predominantly sourced by areas of relief, the remains of Late Palaeozoic orogens located to the north. The rate of extension significantly declined during the Middle Callovian–Kimmeridgian period. Deposition of the overlying Lower Cretaceous continental red-coloured clastic sediments was related to the interaction of basin subsidence, a fall in eustatic sea-level and sediment supply. Subsequent marine transgression in the Late Barremian, partially related to broad thermal subsidence in the Amu-Darya Basin, resulted in the deposition of an extensive Late Cretaceous clay–marl succession.

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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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