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Journal of Geological Society of India (Online archive from Vol 1 to Vol 78)

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Shukla, U. K.

Point Bar Complex of an Exhumed Channel in Upland Interfluve of the Ganga Plain, India

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Authors

I. B. Singh ¹, U. K. Shukla ², P. Srivastava ¹

Affiliations
1 Department of Geology, Lucknow University, Lucknow - 226007, IN
2 Department of Geology, Kumaun University, Nainital - 263 002, IN

Source

Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 51, No 3 (1998), Pagination: 315-322

Abstract

Facies architecture and evolutionary history of a point bar complex of exhumed channel on the upland interfluve surface of the Ganga Plain is presented. The point bar complex is made up of four distinctive sequences, each characterized by a specific lithofacies association and grain size, where successive sequence shows decrease in grain size and reduced channel width denoting reduction in the discharge of the channel. The top of each sequence represents a hiatus surface marked by dense bioturbation. The flow in the exhumed channel was towards south and southwest. At the end of the deposition of third sequence neotectonic activity caused uplift, tilting of the surface and disruption of the river channel. A facies model of such deposits is proposed.

Keywords

Point Bar Complex, Fluvial, Ganga Plain, Palaeocurrent, Indo-Gangetic Alluvium.

Full Text

Palaeoenvironment of Bist College Member in Krol Formation Nainital, Lesser Himalaya

Facies Analysis of the Late Proterozoic Nagthat Formation, Nainital Hills, Kumaun Lesser Himalaya

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Authors

U. K. Shukla ¹, Charu C. Pant ¹

Affiliations
1 Department of Geology, Kumaun University, Nainital-263 002, IN

Source

Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 47, No 4 (1996), Pagination: 431-445

Abstract

The Proterozoic Nagthat Fonnation of Nainital area is composed mainly of fine- to coarse-grained quartzarenite with subordinate amount of pebbly sandstone, conglomerate, siltstone and silty shales. On the basis of such parameters as grain size, primary structures, palaeocurrent and morphology of lithounits, seven major lithofacies have been distinguished in the Nagthat sequence. These are, medium to coarse-grained gravelly quartzarenite (Lithofacies A), bar cross-bedded medium-grained quartzarentite (Lithofacies B), horizontally laminated fine-grained quartzarenite (Lithofacies C), fine to medium-grained channelised quartzarenite (Lithofacies D), fine-grained quartzitic sandstone (Lithofacies E), silty sandstone-shale (Lithofacies F) and matrix supported conglomerate (Lithofacies G).

Lateral and vertical distribution of constituent lithofacies demonstrate deposition of Nagthat sediments in a progradational (regressive) barrier island system, in subtidal upper shoreface and channels, subtidal longshore bars, foreshore beachface, tidal channels (inlets), intertidal sandflat-channel and mixed flat environments, and occasionally as gravity flows in subtidal gravelly channels.

Keywords

Sedimentation, Proterozoic Nagthat Formation, Lesser Himalaya.

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Markov Chain Analysis of the Shallow Marine lBhuj Sandstone of Early Cretaceous Age, Kachchh Basin, India

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Authors

U. K. Shukla ¹, Z. A. Khan ², I. B. Singh ¹

Affiliations
1 Department of Geology, Lucknow University, Lucknow - 226 007, IN
2 Uttar Pradesh, Khanij Bhawan, 2 Way Road, Lucknow - 226001, IN

Source

Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 48, No 5 (1996), Pagination: 567-578

Abstract

Cyclic characteristics of lithofacies of the shallow marine Bhuj Sandstone were studied statistically, using embedded Markov chain analysis and the concept of entropy. Data came from thirteen measured sections. The upward transmissions from one sedimentary lithofacies to another are plotted on a 5×5 matrix and a transition tree is constructed. Results strongly suggest that the Bhuj Sandstone was influenced by a Markovian mechanism and accumulating in well-defined depositional environments; the vertical distribution of lithofacies was controlled by a number of natural processes. The preferential upward transition path of lithologic and depositional envitonment changes are as follows: Carbonaceous siltstone/shale (A) (Coastallagoon) → Coarse-grained cross bedded Sandstone (8) (Estuarine channel) → interbedded sandstone siltstone (C) (Tidal flat-tidal channel) → silty sandstone (D) (Sandflat - shoal) → Bioturbated sandstone (E) (Shelf Sheet sand) → Carbonaceous siltstone/shale (A) (Coastal lagoon).

This sequence is an asymmetrical cycle. It can be identified into a progradational event (lithofacies A-D) and a transgressive event (lithofacies E). The statistical results concur with the sedimentological evidence for depositional environments.

Entropy plots of the E^(pre) and E^(post) values of each lithological state correspond to the type A-4 category (Hattori, 1976), signifying lower and upper truncated asymmetrical cycles. The values of E (system) fall just on the boundary of the area allocated for the neritic environment. The area occupied by the Bhuj Sandstone evidently represents the domain of deposits of a coastal complex of estuary, lagoon and tidal flat environments, deposits for which Hattori had no data base.

Keywords

Sedimentology, Bhuj Sandstone, Markov Analysis, Kachchh Basin, Gujarat.

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Activities of the North India Chapter of the Geological Society of India: Popularizing Geology

Signatures of Palaeofloods in Sandbar-Levee Deposits, Ganga Plain, India

Abstract Views :218 | PDF Views:3

Authors

U. K. Shukla ¹, I. B. Singh ²

Affiliations
1 Department of Geology, Banaras Hindu University, Varanasi - 221 005, IN
2 Department of Geology, Lucknow University, Lucknow - 226007, IN

Source

Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 64, No Spl Iss 4 (2004), Pagination: 455-460

Abstract

Based on architectural element analysis of Sandbar-Levee deposits an attempt has been made to identify recurring floods in the alluvial rivers. Point bar deposits characterized by Low-Angled lateral accretion( LA) elements exhibit some Channel-Ward steeply dipping (18-20°)discordant surfaces. These High-Angled surfaces are erosional and show change of facies across them. Such discordant planes present within the point bar deposits most probably indicate phases of exceptional floods, when the bar was mostly eroded and remodelled under High-Energy conditions. Similarly, in the braid bar deposits superimposed Bar-Building events separated either by mud drapes or marked erosional contacts are restimony to High-Energy floods. At flood times, a new bar may form and can migrate over Pre-Existing sand bar, forming huge sandflat. Alternatively, a new channel may develop cutting across the existing bar complex producing a channel bar having a different orientation Multi-Stoned levee deposits developed at the bank of the channels, and characterized by decimeter to meter scale Fining-Up sequences, are the best indicators of exceptionally large floods overtopping the channels. The flood events are commonly separated by erosional contacts and mottled horizons containing organic matter, ischolar_main burrows and Faecal-Pellet filled earthworm burrow network.

Keywords

Alluvial Rivers, Palaeofloods, Architectural Elements, Point Bar, Braid Bar, Natural Levee.

Full Text

Geomorphic Positioning and Depositional Dynamics of River Systems in Lower Siwalik Basin, Kumaun Himalaya

Abstract Views :208 | PDF Views:0

Authors

U. K. Shukla ¹, D. S. Bora ², C. K. Singh ¹

Affiliations
1 Department of Geology, Banaras Hindu University, Varanasi - 221 005, IN
2 Schlumberger Asia Services Limited, DCS, Mumbai, IN

Source

Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 73, No 3 (2009), Pagination: 335-354

Abstract

Qualitative and quantitative analysis of river systems in the Lower Siwalik sequence has enabled characterization of channel patterns, river metamorphosis and resulting sandstone body evolution in time and space. Processes related six lithofacies repeat to generate 8-10 m thick multistoried sandstone complexes deposited in perennial channel belts. Based on lateral mapping of the sandstone bodies, the surfaces of genetic significance ranging from 3^rd, 4^th and 5^thorder, suggest presence of meandering, braided and anastomosing river patterns that were responsible for the Lower Siwalik sedimentation. Variation in local base-level in response to allogenic factors including climate and tectonics forced river systems to acquire different patterns. Eustasy seems to control large-scale basin level changes.

Quantitatively reconstructed morphological parameters and their comparison with modern and ancient analogues, supported by other independent evidences such as stratigraphical position of sandstone bodies in vertically measured columns and mineralogical characteristics of channel sandstones, enabled to decipher the geomorphic positioning of the Lower Siwalik channels in distal parts of megafan and interfluve areas within the foreland basin setting.

Keywords

Depositional Trend, Palaeochannel Pattern, Palaeogeomorphology, Allogenic Forcing, Lower Siwalik, Kumaun Himalaya.

Full Text

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Trace Fossils from the Late Cretaceous Lameta Formation, Jabalpur Area, Madhya Pradesh: Paleoenvironmental Implications

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Authors

Omnath Saha ¹, U. K. Shukla ¹, Rekha Rani ¹

Affiliations
1 Centre for Advanced Study in Geology, Banaras Hindu University, Varanasi - 221 005, IN

Source

Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 76, No 6 (2010), Pagination: 607-620

Abstract

In Jabalpur area about 18 m to 45 m thick Lameta Formation is stratigraphically divisible into five lithounits namely, Green Sandstone, Lower Limestone, Mottled Nodular Beds, Upper Limestone and Upper Sandstone. Having differentiated lithofacies constitution and here grouped as facies associations, these units are intensively burrowed and sparingly fossiliferous. Ichnogenera including Arenicolites, Calycraterion, Fucusopsis, Laevicyclus, Macanopsis, Ophiomorpha, Paleomeandron, Rhizocorallium, Stipsellus, Thalassinoides and Zoophycos are recovered from the Lower Limestone, Mottled Nodular Beds and Upper Limestone associations of the Lameta Formation of Jabalpur area.Among these, Arenicolites, Calycraterion, Laevicyclus, Ophiomorpha, Rhizocorallium, Stipsellus and Thalassinoides belong to mixed Skolithos and Cruziana ichnofacies and indicate sandy backshore to sublittoral condition of deposition. Additionally rhyzocretes, some times chertified, are also present in different parts of the Lameta Formation. Ichnofacies assemblage supported by sedimentological information suggests that the Lameta Formation of Jabalpur area was deposited in coastal marine settings where sediments were subaerially exposed intermittently.

Keywords

Lameta Beds, Late Cretaceous, Trace Fossils, Shallow Marine, Jabalpur, Madhya Pradesh.

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Geology and Geo-Resources of Himalaya and Cratonic Regions of India

Abstract Views :168 | PDF Views:126

Authors

B. P. Singh ¹, U. K. Shukla ¹, R. Bhatla ², D. Prakash ¹, A. S. Naik ¹, Kuldeep Prakash ¹, C. K. Singh ¹

Affiliations
1 Centre of Advanced Study in Geology and Banaras Hindu University, Varanasi - 221 005, IN
2 Department of Geophysics, Banaras Hindu University, Varanasi- 221 005, IN

Source

Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 79, No 5 (2012), Pagination: 544-544

Abstract

A National Seminar on “Geology and Geo-resources of the Himalaya and the cratonic regions of India” was organised by the Department of Geology, (Centre of Advanced Study), Kumaun University, Nainital during 10-12^th March, 2012. The Seminar was co-sponsored under the CAS Programme by the University Grants Commission, New Delhi; Department of Science and Technology, New Delhi; Uttarakhand State Council for Science and Technology, Dehradun; Kumaun University, Nainital; Censico International (P) Ltd., Agra. In all, 125 delegates from all over India actively participated in this national seminar.

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