Chapter 19 Geological history of the Kaladgi–Badami and Bhima basins, south India: sedimentation in a Proterozoic intracratonic setup

Dey, Sukanta

doi:10.1144/m43.19

Cited by 27 publications

(13 citation statements)

References 38 publications

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“…The Kaladgi Basin covers an area, of about 8,000 km 2 with a strike extent of ~200 km and maximum exposed width of ~100 km. The maximum aggregate thickness of the sedimentary succession is ~3,900 m (Dey, ; Jayaprakash, Sundaram, Hans, & Mishra, ; Radhakrishna & Vaidyanadhan, ). Parts of the basin (in the north and west) are concealed under the Deccan traps but crop out through numerous inliers of the trap (Raha & Sastry, ).…”

Section: Geology and Structure―backgroundmentioning

confidence: 99%

“…The succession is divided into two groups, the Kaladgi Group and the Badami Group in stratigraphic order, separated by an angular unconformity (Figure ). The Kaladgi Group is further subdivided into two subgroups, represented by two distinct fining‐up cycles of sedimentation (Dey, ; Jayaprakash et al, ). The lower cycle comprises the Lokapur Subgroup (2,750 m), and the upper cycle comprises the Semikeri Subgroup (1,150 m).…”

Section: Geology and Structure―backgroundmentioning

confidence: 99%

“…The lower part of the Ramdurg Formation (~414 m thick) preserves poorly sorted, polymodal, very coarse‐ to fine‐grained quartz arenite, locally pebbly, and arkosic. Lenticular bodies of conglomerates are also present in the lower part of the succession (Dey, ; Jayaprakash et al, ). The pebbles are mostly of vein quartz, jasper, granite, as well as minor quartzite and haematite (Figure a,b).…”

Section: Geology and Structure―backgroundmentioning

confidence: 99%

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Depositional history and provenance of cratonic “Purana” basins in southern India: A multipronged geochronology approach to the Proterozoic Kaladgi and Bhima basins

et al. 2018

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Peninsular India is a collage of Archaean cratonic domains separated by Proterozoic mobile belts. A number of cratonic basins, known as “Purana basins” in the Indian literature, formed in different parts of the Indian Peninsula during extensional tectonic events, from Paleoproterozoic through Neoproterozoic times. In this contribution, we present a diversity of new geochronological data for different units within the Kaladgi and the Bhima basins, which overlie the western and eastern Dharwar cratons, respectively. The new geochronology data are discussed in terms of depositional history and provenance of these poorly understood Proterozoic intracratonic basins. For the Kaladgi Group, a U–Pb baddeleyite age of 1,861 ± 4 Ma obtained for a dolerite dyke intruding the Yendigere Formation is used to constrain the minimum age of deposition of the lower Kaladgi Group. This result demonstrates that this part of the succession is comparable in age to the Papaghni Group of the Cuddapah Basin, heralding onset of Purana sedimentation at ~1,900 Ma. The detrital zircon populations from the clastic rocks of the Kaladgi and Bhima basins show unique and distinct age patterns indicating different source of sediments for these two basins. Palaeocurrent analysis indicates a change in provenance from south or southeast to west or northwest between the Kaladgi and Bhima clastic sedimentation. New U–Th–Pb and Rb–Sr radiometric dates of limestones and glauconite‐bearing sandstones of the Bhima Group (Bhima Basin) and the Badami Group (Kaladgi Basin) indicate deposition at around 800–900 Ma, suggesting contemporaneity for the two successions. Thus, the unconformity between the Kaladgi Group and the overlying Badami Group represents a time gap of up to 1,000 Myr. These new results demonstrate the complex multistage burial and unroofing history of the Archaean Dharwar Craton throughout the Proterozoic, with important implications for exploration of metal deposits and diamonds in Peninsular India.

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Section: Geology and Structure―backgroundmentioning

confidence: 99%

Section: Geology and Structure―backgroundmentioning

confidence: 99%

Section: Geology and Structure―backgroundmentioning

confidence: 99%

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Depositional history and provenance of cratonic “Purana” basins in southern India: A multipronged geochronology approach to the Proterozoic Kaladgi and Bhima basins

et al. 2018

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“…The CLM, in the exposure studied, as a part of the Bagalkot Group, is underlain and overlain by the Hebbal Argillite and Naganur Dolomite, respectively (Figure b); all these formations, in a conformable succession, have been interpreted as lacustrine (Choudhuri, ). Both the RLF and the CLM were deposited in intracratonic rift basins (Bose et al, ; Dey, ).…”

Section: Geological Backgroundmentioning

confidence: 99%

Flat pebbles and their edge‐wise fabric in relation to 2‐D microbial mat

et al. 2018

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Flat pebbles and edge‐wise fabric in the Mesoproterozoic Rohtas Limestone Formation (RLF) and the Chikkshelikere Limestone Member (CLM), India, generate a new insight into their formation. Simple stacks of alternating dark micritic and light‐coloured microsparite planar layers in the targeted sedimentary successions manifest a low‐energy depositional background, disturbed only occasionally by weak storms. While the dark layers are homogeneous, light‐coloured layers are generally planar, wavy ripple laminated, and bear frequent load casts. The dark layers often display varieties of 2‐D microbial mat structures little known from carbonate formations. In compliance with their identity, they are comparatively enriched in carbon, a large part of which is organic and kerogen. The said structures with their intrinsic deformations indicate delayed cementation. Notwithstanding delayed cementation, the flat clasts in these formations are readily traceable to the dark laminae possibly because of early acquisition of their selective cohesiveness. Resultant stress led to brittle deformation in the mat layers, while the light‐coloured layers underwent ductile deformation. All the studied breccias bodies are in situ, but this fact does not preclude either the possibility of reworking of the clasts while exposed to high‐energy current or generation of intraclasts by high‐energy currents eroding the depositional surface.

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“…They relate this once again to Precambrian supercontinent cycles, specifically to Columbia break-up and Rodinia assembly. Dey (2015) examines the Purana successions making up the basin-fills of the KaladgiBadami and Bhima intracratonic depositories on the northern margin of the Dharwar Craton. The merits of a far-field tectonically controlled model for the former and a pull-apart basin model for the latter are discussed.…”

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confidence: 99%