Facies Sequence and Cryptic Imprint of Sag Tectonics in the Late Proterozoic Sirbu Shale, Central India

Sarkar, S.; Chakraborty, Shankar; Banerjee, Santanu; Bose, Pradip

doi:10.1002/9781444304312.ch17

Cited by 24 publications

(25 citation statements)

References 22 publications

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“…1; Bose et al, 2001). Resting on the overall prograding marine shelf succession of the coeval Sirbu Shale, this Member is dominantly non-marine, marking the penultimate stage of sedimentation within an intracratonic sag basin (Bose et al, 1999(Bose et al, , 2001Sarkar et al, 2002a;Ray, 2006). Parasequences, separated by gently seaward dipping convex-upward erosive surfaces, comprise this Member.…”

Section: Aeolian Systemsmentioning

confidence: 95%

Sedimentation patterns during the Precambrian: A unique record?

Bose

Eriksson

Sarkar

et al. 2012

Marine and Petroleum Geology

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Although the similarities between depositional processes and products as well as the analogous controls on basinfilling and evolution appear to have enjoyed great uniformity throughout the sedimentary rock record, a noticeable distinction exists in the rates and intensities of a broad range of geological processes in the Precambrian epoch. This paper searches for distinctiveness in the Precambrian sedimentary record, both siliciclastic and carbonate, through an extensive, though not exhaustive, review of the relevant literature augmented by new observations. While differences in Precambrian deltaic, aeolian, glacial and possibly also lacustrine deposits and settings appear to have been small, their large-scale development was controlled largely by a combination of temporal and geodynamic influences, essentially of global compass. In this regard the onset of the supercontinent cycle and major perturbations in palaeo-atmospheric composition appear to have been significant. Marine environments provide a 2 poor platform for Precambrian -Phanerozoic comparisons of sedimentation patterns, as those from the former period are preserved almost exclusively in epeiric settings, an environment essentially lacking on modern Earth. For the shallow marine carbonates, biological mediation of chemical sediment deposition changed radically from dominance by microbial biota in the Precambrian to a combination of metazons, protozoans and algae for the skeletal carbonates of the Phanerozoic. Despite it being widely recognized that Precambrian channel systems were braided in all environments (deltaic, tidal, alluvial, fluvial) as a consequence of the lack of vegetation and poor development of soils, the fluvial setting has some enigmatic aspects. Amongst these is evidence for ponding of muddy detritus in apparently sandstone bed-load dominated braided systems, with effects on local palaeoslopes which have resulted in unusual palaeohydraulic parameters for Precambrian fluvial systems. This is perhaps a field of research which holds greater promise when investigating sedimentation patterns prior to the Phanerozoic.

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Section: Aeolian Systemsmentioning

confidence: 95%

Sedimentation patterns during the Precambrian: A unique record?

Bose

Eriksson

Sarkar

et al. 2012

Marine and Petroleum Geology

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“…The tabular geometry of the beds laid down by the outgoing flow and of the incoming-outgoing bed couplets also argues against any such profound channel confinement. Above all, the Upper Bhander Sandstone is interpreted to have been deposited along an open, wave-dominated coast and accordingly, no unambiguous tidal feature has ever been reported from its coeval shelf deposits of the Sirbu Shale (Bose et al, 2001;Sarkar et al, 2002).…”

Section: Possible Tsunami Origin Of the Event Bedsetmentioning

confidence: 99%

“…The formation, being only mildly deformed post-depositionally, has subhorizontal beds dipping gently to the northwest, and is also virtually unmetamorphosed. Because of punctuated coastal progradation during deposition of the Bhander Formation, the Upper Bhander Sandstone rests on the open shelf succession of the Sirbu Shale (Sarkar et al, 2002;Fig. 1B) and its own inferred palaeogeography repeatedly transits upward from a stormaffected beach to a coastal erg setting, through an erg-margin.…”

Section: Geological Backgroundmentioning

confidence: 99%

“…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). It is likely that tsunami retreat down these slopes induced localised collapse of the coastline owing to rapid draw-down of water on an unusually large scale.…”

Section: Possible Tsunami Origin Of the Event Bedsetmentioning

confidence: 99%

“…Considering the inferred intracratonic sag origin of the depositional basin (Bose et al, 1999(Bose et al, , 2001Sarkar et al, 2002), the studied bedset can more precisely be postulated to be a teletsunamiite, deposited far away from the earthquake epicentre, had earthquake been the root cause for this tsunami as it is in most other cases. The tsunami here appears to have coincided with earthquake seiches but that was possibly a mild response to the inferred major earthquake at a plate margin, which may typically be more than 1000 km away (Miall, 1997).…”

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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