Epeiric Sea Formation on Neoproterozoic Supercontinent Break-up: A Distinctive Signature in Coastal Storm Bed Amalgamation

Sarkar, S.; Eriksson, P.G.; Chakraborty, Shankar

doi:10.1016/s1342-937x(05)70786-3

Cited by 18 publications

(16 citation statements)

References 40 publications

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“…Regional study revealed cm-scale synsedimentary slides in opposite directions, in response to mild extension of the intracratonic sag regime of deposition, resulting in depositional slope generation at times (Sarkar et al, 2004). The formation, being only mildly deformed post-depositionally, has subhorizontal beds dipping gently to the northwest, and is also virtually unmetamorphosed.…”

Section: Geological Backgroundmentioning

confidence: 99%

“…Within them planar and wavy laminae pass upwards into bidirectional spillover ripples capped by reddish mudstone, replete with desiccation cracks. Individual storm beds are up to 12 cm thick, thinning out eastward in the landward direction (Bose et al, 1999;Sarkar et al, 2004;Simpson et al, 2004 and many others).…”

Section: Geological Backgroundmentioning

confidence: 99%

“…Bose et al (1999) and Simpson et al (2004) provide a detailed account of the facies constituting the Upper Bhander Sandstone, except for the two amalgamated bed couplets addressed here. Storm beds are common within the Upper Bhander Sandstone, and Bose et al (1999) and Sarkar et al (2004) have described and interpreted them in detail.…”

Section: Geological Backgroundmentioning

confidence: 99%

“…As a result of the low gradient of the inferred epeiric coastal tract, the supralittoral storm beds in the Upper Bhander Sandstone are amalgamated (Sarkar et al, 2004). They are made of well sorted sandstone, overall graded and transforming upward into thin reddish mudstone.…”

Section: Geological Backgroundmentioning

confidence: 99%

“…However, against the inferred epeiric sea background in an intracratonic sag basin envisaged for the Upper Bhander Sandstone, the generation of a steep slope as a prerequisite for inducing slumps in abundance during the flow retreat is highly unlikely (Sarkar et al, 2004). It is, nevertheless, quite possible that the tsunami was earthquake-induced, as most tsunamis are, and it has been independently postulated that many such earthquake events did create slopes in the Upper Vindhyan basin (Bose et al, 2001;Sarkar et al, 2002).…”

Section: Possible Tsunami Origin Of the Event Bedsetmentioning

confidence: 99%

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Neoproterozoic tsunamiite: Upper Bhander Sandstone, Central India

Sarkar¹,

Bose²,

Eriksson³

2011

Sedimentary Geology

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This paper addresses a distinctive event bedset encased by coastal erg-margin deposits, at a preferred stratigraphic level near the base of the Neoproterozoic Upper Bhander Sandstone in central India. The bedset is composed of couplets of sandstone beds that exhibit incisive amalgamation although they differ in geometry, structures (at soles, within and at tops of beds), vertical grain-size variation as well as palaeocurrent pattern and direction. The wide extent of the bedset is evident from several exposures spread over a distance of more than 50 km roughly in strike-parallel direction. Flow and depositional dynamics interpreted from the coupled event beds are more consistent with a tsunami origin than alternative palaeogeography-compatible models of climate-induced storm, flash flood or accentuated tide deposits. A palaeotsunamiite model is thus discussed, with separate incoming and outgoing components. Considering the overall depositional setting to be an epeiric sea coast in an intracratonic sag basin, the relevant bedset is inferred to reflect the record of a teletsunamiite; it would also be one of the very few Precambrian tsunamiites known so far. Exceptional preservation of this possible tsunamiite was facilitated by sheltered deposition behind the backshore zone and the berm, as well as by rapid burial by wind-deflated sands and advancing aeolian dunes.

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Section: Geological Backgroundmentioning

confidence: 99%

Section: Geological Backgroundmentioning

confidence: 99%