Earthquake-related soft-sediment deformation structures in Palaeogene on the continental shelf of the East China Sea |
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| Authors: | Shanshan Li Yuansheng Du Zhe Zhang and Jinhua Wu |
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| Institution: | (1) Faculty of Earth Sciences, China University of Geosciences, Wuhan, 430074, China;(2) Key Laboratory of Biogeology and Environmental Geology of Ministry of Education, Wuhan, 430074, China |
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| Abstract: | Earthquake, as disastrous events in geological history, can be recorded as soft-sediment deformation. In the Palaeogene of
the East China Sea shelf, the soft-sediment deformation related to earthquake event is recognized as seismic micro-fractures,
micro-corrugated laminations, liquefied veins, ‘vibrated liquefied layers’, deformed cross laminations and convolute laminations,
load structures, flame structures, brecciation, slump structures and seismodisconformity. There exists a lateral continuum,
the wide spatial distribution and the local vertical continuous sequences of seismites including slump, liquefaction and brecciation.
In the Palaeogene of East China Sea shelf, where typical soft-sediment deformation structures were developed, clastic deposits
of tidal-flat, delta and river facies are the main background deposits of Middle-Upper Eocene Pinghu Formation and Oligocene
Huagang Formation. This succession also records diagnostic marks of event deposits and basinal tectonic activities in the
form of seismites. |
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| Keywords: | East China Sea shelf Palaeogene earthquake soft-sediment deformation seismites |
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