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

Abstract : The Bukhara-Khiva region forms the northern margin of the Mesozoic Amu-Darya Basin. We have 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 tectonicsedimentary evolution during the Jurassic times. Subsequent to the Cimmerian collision in the Middle Triassic, an extensional event controlled the deposition of the Early-Middle Jurassic-age siliciclastic succession in the Bukhara-Khiva region. During this period the main Late Palaeozoic-age inherited structures were reactivated as normal faults. Continental, coarse-grained siliciclastics are mainly confined to the basal Lower Jurassic section, probably Pliensbachian-Toarcian in age, whereas marine siliciclastics 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-age 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 clastics 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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Article dans une revue
The Geological Society, London, Special Publications, Geological Society of London, 2017, Geological Evolution of Central Asian Basins and the western Tien-Shan Range, 427, <www.geolsoc.org.uk/>
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https://hal.archives-ouvertes.fr/hal-01481990
Contributeur : Marie-Françoise Brunet <>
Soumis le : vendredi 3 mars 2017 - 10:36:58
Dernière modification le : lundi 29 mai 2017 - 15:02:49

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  • HAL Id : hal-01481990, version 1

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Dmitriy Mordvintsev, Eric Barrier, Marie-Françoise Brunet, Christian Blanpied, Irina Sidorova. Structure and evolution of the Bukhara-Khiva region during the Mesozoic: the northern margin of the Amu-Darya Basin (southern Uzbekistan). The Geological Society, London, Special Publications, Geological Society of London, 2017, Geological Evolution of Central Asian Basins and the western Tien-Shan Range, 427, <www.geolsoc.org.uk/>. <hal-01481990>

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