Evidence of superimposition of storm waves on tidal currents in rocks from the Tithonian-Neocomian Umia Member, Kutch, India

Bose, Pradip; Ghosh, Gautam; Shome, S.; Bardhan, Subhendu

doi:10.1016/0037-0738(88)90039-5

Cited by 26 publications

(13 citation statements)

References 9 publications

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“…Bose et al 1988). As with the other phosphorite occurrences in Egypt, the shales intercalated and laterally associated with the phosphorites are locally phosphatic, containing randomly disseminated phosphate pellets and skeletal debris.…”

Section: The Western Desert 'Phosphorite Formation'mentioning

confidence: 82%

Depositional sequences of the Duwi, Sibâîya and Phosphate Formations, Egypt: phosphogenesis and glauconitization in a Late Cretaceous epeiric sea

Glenn

1990

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Sedimentary facies, depositional environments and stratigraphic relationships of the Upper Cretaceous Duwi, Sib~iya and Phosphate Formations in Egypt are summarized in order to shed light on the origins and interrelationships between phosphorites and their commonly associated facies. The distribution of phosphorites, glauconitic sands, organic carbon-rich shales, cherts and porcelanites, and bioclastic and fine-grained limestones are correlated in both space and time across the central phosphorite provenance of the country. The correlations are linked by means of sequence stratigraphic analysis and are tied to global eustatic sea-level curves.Two main depositional realms are inferred from the Campanian lithofacies assemblages: (1) a deeper-water hemipelagic environment accompanying maximum transgression dominated by deposition of phosphorites, organic carbon-rich shales and biosiliceous sediments, which, after maximum flooding, shoals upwards into (2) a progradational stage accompanying sea-level fail, during which oyster banks with brackish back-reef sediments (Eastern Desert) and deltaic sediments (upper Quseir Variegated Shale, Nile Valley) dominated eastern portions of the phosphorite belt, while greensands were reworked seaward from earlier inner shelf sediments in the west (Western Desert). These depositional realms encompass (1) transgressive to lower highstand systems tracts and (2) upper highstand to lowstand progradational wedge system tracts, respectively. The reoccurrence of lower Maastrichtian phosphatic shale, marl and associated phosphorite lithofacies at the top of the sequence indicates repetition of the sedimentary cycle.Both phosphorites and glauconitic greensands appear to be the result of current winnowing and reworking of authigenic grains from previously deposited sediments. The resulting deposits range in scale from thin lag layers, to amalgamated beds, to giant sand waves up to 10 m thick. In the Egyptian setting, the common factors linking massive phosphorite and glauconite occurrences may have been the co-occurrence of humid climate, deep lateritic weathering in hinterlands, anoxic bottom waters on the inner shelf, and high fluvial discharge rates of phosphorus and iron. Superimposed on these factors were influences of cross-shelf currents necessary to concentrate authigenic precipitates, and a sea level change, which acted to markedly reduce the diluting effects of siliciclastic detritus during rapid sea level rise, as well as vertically stack 'authigenic facies' during sea level fall.

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Section: The Western Desert 'Phosphorite Formation'mentioning

confidence: 82%

Depositional sequences of the Duwi, Sibâîya and Phosphate Formations, Egypt: phosphogenesis and glauconitization in a Late Cretaceous epeiric sea

Glenn

1990

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“…This leads one also to consider the possible interference between IWs (in a shallow pycnocline) and surface storm waves; in this case the angle of the surface‐wave crest can be highly variable with respect to the shoreline, while the IW crests remain parallel. A possible interference mechanism has already been proposed for some Tithonian‐Lower Cretaceous rocks of India, where HCS were interpreted to result from storm wave interference with ebb‐tide currents (Bose et al. , 1988).…”

Section: Discussionmentioning

confidence: 99%

Internal waves vs. surface storm waves: a review on the origin of hummocky cross‐stratification

Morsilli

Pomar

2012

Terra Nova

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Terra Nova, 24, 273–282, 2012 Abstract Hummocky cross‐stratification (HCS) is considered a diagnostic structure of surface storm activity at the shoreface–offshore transition. However, the origin of HCS is still debated. Laboratory experiments have not yet reproduced it and direct observations on the continental shelves do not exist. Most hydrodynamic interpretations invoke pure oscillatory flows, unidirectional‐dominated combined flows and oscillatory‐dominated flows, but they all share the assumption of HCS to reflect the combined action of surface storm waves and related currents. Within this context of uncertainties, internal waves (gravity waves propagating along the pycnocline) provide an alternative mechanism to explain the origin of HCS. Internal waves breaking on the shelf create episodic high‐turbulence events and induce upslope‐ and downslope currents as well as oscillatory flows at the depth where the pycnocline intersects the sea floor. In this scenario, both the oscillatory‐ and the unidirectional components needed for HCS to form are not necessarily linked to surface storm waves, but can occur at various depth as far and near there is a pycnocline where internal waves can form.

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“…Mitra et al, 1979) and span the Bathonian to the Aptian. The Patcham and Chari formations (Bathonian-Oxfordian) of Kutch contain mostly calcareous rocks deposited in a shallow marine shelf environment (Datta, 1992;Fürs-ich and Oschmann, 1993), whereas, Katrol and Bhuj formations (Kimmeridgian-Aptian) include coarse siliciclastics indicating gradual shallowing of the basin punctuated by many transgressive-regressive couplets (Bose et al, 1988;Biswas, 1991). New assemblages of gastropods ranging in age from the Bathonian to Berriasian have been recently described from the Patcham, Chari and Bhuj formations (Das, 2002;Das et al, 1998Das et al, , 1999Jaitly et al, 2000;Jaitly and Szabó, 2002).…”

Section: Stratigraphymentioning

confidence: 97%

“…Detailed facies analyses of the Umia and Ghuneri members belonging to the Bhuj Formation were made (Bardhan et al, 1989;Bose et al, 1986Bose et al, , 1988Ghosh et al, 1986). The Umia Member is characterized by repeated cycles of pebbly facies, hummocky cross-stratiWed, multistoried sand bodies and heterolithic facies consisting of thin, sharp-based sandstone.…”

Section: Stratigraphymentioning

confidence: 99%

Record of a new species of Obornella Cox 1959 (Gastropoda) from the Tithonian of Kutch, western India

Das

2007

Journal of Asian Earth Sciences

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Evidence of superimposition of storm waves on tidal currents in rocks from the Tithonian-Neocomian Umia Member, Kutch, India

Cited by 26 publications

References 9 publications

Depositional sequences of the Duwi, Sibâîya and Phosphate Formations, Egypt: phosphogenesis and glauconitization in a Late Cretaceous epeiric sea

Depositional sequences of the Duwi, Sibâîya and Phosphate Formations, Egypt: phosphogenesis and glauconitization in a Late Cretaceous epeiric sea

Internal waves vs. surface storm waves: a review on the origin of hummocky cross‐stratification

Record of a new species of Obornella Cox 1959 (Gastropoda) from the Tithonian of Kutch, western India

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