Soft-sedimentary deformational structures: seismites or penecontemporaneous, a study from the Palaeoproterozoic Lesser Himalayan succession, India

摘要

Palaeoproterozoic sedimentary succession of the Lesser Himalaya contains soft-sedimentary deformational structures (SSDS) caused during fluidization and liquefaction induced by seismic activity. Morphologically, the SSDS are represented by convolute bedding/lamination, ball-and-pillow, pseudonodules, and deformed cross-stratification and flame structures. After examining all other factors, it is inferred that the SSDS are the result of shocks, which can only be explained satisfactorily as triggered by earthquakes.