Soft-sediment deformation structures in cores from lacustrine slurry deposits of the Late Triassic Yanchang Fm. (central China)
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Date
2016-12
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Publisher
Instytut Geologii UAM
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Abstract
The fine-grained autochthonous sedimentation in the deep part of a Late Triassic lake was frequently interrupted by
gravity-induced mass flows. Some of these mass flows were so rich in water that they must have represented slurries.
This can be deduced from the soft-sediment deformation structures that abound in cores from these lacustrine deposits
which constitute the Yanchang Fm., which is present in the Ordos Basin (central China).
The flows and the resulting SSDS were probably triggered by earthquakes, volcanic eruptions, shear stress of gravity
flows, and/or the sudden release of overburden-induced excess pore-fluid pressure. The tectonically active setting, the
depositional slope and the high sedimentation rate facilitated the development of soft-sediment deformations, which
consist mainly of load casts and associated structures such as pseudonodules and flame structures. Sediments with such
deformations were occasionally eroded by slurries and became embedded in their deposits.
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Keywords
soft-sediment deformation structures, low-density gravity-flow deposits, Triassic, lacustrine sediments, Ordos Basin, China
Citation
Geologos, 2016, 22, 3, pp. 201-211
ISBN
ISBN 978-83-232187-4-6