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The Upper Jurassic–Lower Cretaceous alluvial-fan deposits of the Kalaza Formation (Central Asia): Tectonic pulse or increased aridity?

By
Marc Jolivet
Marc Jolivet
Université de Rennes 1, Laboratoire Géosciences Rennes, UMR 6118 CNRS/INSU, Campus de Beaulieu, 35042 Rennes, France
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Sylvie Bourquin
Sylvie Bourquin
Université de Rennes 1, Laboratoire Géosciences Rennes, UMR 6118 CNRS/INSU, Campus de Beaulieu, 35042 Rennes, France
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Gloria Heilbronn
Gloria Heilbronn
Université de Rennes 1, Laboratoire Géosciences Rennes, UMR 6118 CNRS/INSU, Campus de Beaulieu, 35042 Rennes, France
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Cecile Robin
Cecile Robin
Université de Rennes 1, Laboratoire Géosciences Rennes, UMR 6118 CNRS/INSU, Campus de Beaulieu, 35042 Rennes, France
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Laurie Barrier
Laurie Barrier
Institut de Physique du Globe de Paris, Sorbonne Paris Cité, Université Paris Diderot, UMR 7154 CNRS, F-75005 Paris, France
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Marie-Pierre Dabard
Marie-Pierre Dabard
Université de Rennes 1, Laboratoire Géosciences Rennes, UMR 6118 CNRS/INSU, Campus de Beaulieu, 35042 Rennes, France
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Yingying Jia
Yingying Jia
State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
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Elien De Pelsmaeker
Elien De Pelsmaeker
Department of Geology and Soil Sciences, Ghent University, Krijgslaan 281/S8, B-9000 Ghent, Belgium
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Bihong Fu
Bihong Fu
State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
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Published:
January 01, 2017

Abstract

The topographical evolution of tectonic systems, as well as the sedimentation pattern and depositional environments in the associated basins, are controlled by both tectonics and climate. In the region of the Tien Shan (Central Asia), the Jurassic–Lower Cretaceous period was marked by complex, low-intensity tectonic deformation and major climate changes from humid to arid conditions (Jurassic) to semi-arid conditions (Cretaceous). Using the sediment record in the Junggar, Tarim and Fergana basins to describe the tectonic evolution of the Tien Shan area during the Mesozoic thus requires differentiation between the tectonic and climatic influences on sedimentation. The conglomerates of the Upper Jurassic–Lower Cretaceous Kalaza Formation were commonly associated with renewed tectonic activity resulting from the docking of the Lhasa block along the southern margin of Asia. From sedimentology and sequence stratigraphy analyses of several sections in the Junggar, Tarim and Fergana basins, we reassess the main factors controlling the deposition of this formation. We show that, while some tectonic activity persisted throughout the Jurassic–Cretaceous transition, the switch from the sandy deposits of the Upper Jurassic Qigu Formation to the coarse deposits of the Kalaza Formation is largely linked to the development of an arid climate.

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Contents

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

GeoRef

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