Seismic and non-seismic soft-sediment deformation structures in the Proterozoic Bhander Limestone, central India
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Date
2014-06-30
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Bogucki Wydawnictwo Naukowe
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Abstract
Numerous soft-sediment deformation structures occur within the Proterozoic Bhander Limestone of an intracratonic
sag basin in a 750 m long section along the Thomas River, near Maihar, central India. Part of these deformation structu -res have most probably a non-seismic origin, but other structures are interpreted as resulting from earthquake-induced
shocks. These seismic structures are concentrated in a 60 cm thick interval, which is interpreted as three stacked seismi -tes. These three seismites are traceable over the entire length of the section. They divide the sedimentary succession in
a lower part (including the seismites) deposited in a hypersaline lagoon, and an upper open-marine (shelf) part. Most
of the soft-sediment deformations outside the seismite interval occur in a lagoonal intraclastic and muddy facies asso -ciation.
The SSDS within the seismite interval show a lateral continuity. They record simultaneous fluidisation and liquefaction.
The bases of each of the three composing seismite bands are defined by small-scale shear folds, probably recording an
earthquake and aftershocks.
The presence of the three seismite bands at the boundary between the lagoonal and the overlying open-marine oolitic
facies association suggests that the seismic event also triggered basin subsidence.
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Keywords
Seismites, Soft-sediment deformation structures, Basin subsidence, Bhander Limestone, Proterozoic, India
Citation
Geologos, 2014, 20, 2, s. 89-103
ISBN
978-83-232187-4-6