Proterozoic intracontinental basin: The Vindhyan example

Chakraborty, Chandan

doi:10.1007/bf02703022

Cited by 70 publications

(54 citation statements)

References 27 publications

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“…1.5-1.4 Ga (Kumar et al, 2001), and a whole-rock Pb-Pb age of 1.65 ± 0.089 Ga from the uppermost phosphatic Tirohan Dolomite (Bengtson et al, 2009). While these dates broadly support correlation between the Tirohan Dolomite of the Chitrakoot Formation and the Rohtas Limestone of the Semri Group (Bengtson et al, 2017), robust stratigraphic correlations between the Chitrakoot outlier and principal Vindhyan sections in the Son Valley are complicated by inconclusive chemostratigraphic signatures (Ray et al, 2003) and significant lithological and thickness differences between these successions (Chakraborty, 2006 …”

Section: Age Of the Chitrakoot Taxamentioning

confidence: 95%

Precise age of Bangiomorpha pubescens dates the origin of eukaryotic photosynthesis

Gibson

Shih

Cumming

et al. 2017

Geology

162

128

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Shale samples were collected from outcrops that lack evidence for secondary mineralization from hydrothermal activity and weathered regions that may have experienced alteration were also avoided. Sample sets comprise several 100-200 g samples excavated 10-30 cm from the outcrop surface to target fresh material. Samples were collected along strike from a narrow stratigraphic range (<10 cm), as well as from a vertical profile (up to 5 m). The most organic-rich and least visibly-weathered samples were then chosen for digestion and isotopic

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Section: Age Of the Chitrakoot Taxamentioning

confidence: 95%

Precise age of Bangiomorpha pubescens dates the origin of eukaryotic photosynthesis

Gibson

Shih

Cumming

et al. 2017

Geology

162

128

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“…The Archean and Paleoproterozoic basement is covered widely by strata of the Vindhyan Supergroup, occurring in parts of the Central Indian Shield with a maximum thickness of about 4500 m (Ahmad 1958;Chakraborty and Bhattacharyya 1996). The Vindhyan Supergroup was deposited after the stabilization of the Aravalli-Bundelkhand (also known as Bhandara) craton around the time of completion of felsic magmatism at about 2.2 Ga (Chakraborty 2006). These sediments are unmetamorphosed and nearly Fig.…”

Section: The Age Of the Dhala Structurementioning

confidence: 99%

“…The Vindhyan Supergroup has been subdivided into Lower (Semri Formation) and Upper sequences (Kaimur, Rewa, and Bhander Formations) (Banerjee et al 2006;Chakraborty 2006). In general, the Semri Group (or pre-Kaimur Formation) comprises mostly marine sediments that include carbonates, siliciclastics, and volcaniclastics (Banerjee et al 2006).…”

Section: The Age Of the Dhala Structurementioning

confidence: 99%

The Dhala structure, Bundelkhand craton, Central India—Eroded remnant of a large Paleoproterozoic impact structure

Pati

Reimold

Koeberl

et al. 2008

Meteorit & Planetary Scien

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Abstract-The newly discovered Dhala structure, Madhya Pradesh State, India, is the eroded remnant of an impact structure with an estimated present-day apparent diameter of about 11 km. It is located in the northwestern part of the Archean Bundelkhand craton. The pre-impact country rocks are predominantly granitoids of ∼2.5 Ga age, with minor 2.0-2.15 Ga mafic intrusive rocks, and they are overlain by post-impact sediments of the presumably >1.7 Ga Vindhyan Supergroup. Thus, the age for this impact event is currently bracketed by these two sequences. The Dhala structure is asymmetrically disposed with respect to a central elevated area (CEA) of Vindhyan sediments. The CEA is surrounded by two prominent morphological rings comprising pre-Vindhyan arenaceousargillaceous and partially rudaceous metasediments and monomict granitoid breccia, respectively. There are also scattered outcrops of impact melt breccia exposed towards the inner edge of the monomict breccia zone, occurring over a nearly 6 km long trend and with a maximum outcrop width of ∼170 m. Many lithic and mineral clasts within the melt breccia exhibit diagnostic shock metamorphic features, including multiple sets of planar deformation features (PDFs) in quartz and feldspar, ballen-textured quartz, occurrences of coesite, and feldspar with checkerboard texture. In addition, various thermal alteration textures have been found in clasts of initially superheated impact melt. The impact melt breccia also contains numerous fragments composed of partially devitrified impact melt that is mixed with unshocked as well as shock deformed quartz and feldspar clasts. The chemical compositions of the impact melt rock and the regionally occurring granitoids are similar. The Ir contents of various impact melt breccia samples are close to the detection limit (1-1.5 ppb) and do not provide evidence for the presence of a meteoritic component in the melt breccia. The presence of diagnostic shock features in mineral and lithic clasts in impact melt breccia confirm Dhala as an impact structure. At 11 km, Dhala is the largest impact structure currently known in the region between the Mediterranean and southeast Asia.

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“…The slides, folds, and thrusts presented in this paper provide clues for stress-induced extension and compression in the rifted Vindhyan basin during its post-rift evolution stage through the LL depositional history. This is, however, in contradiction to the traditional belief that the tectonic control on sedimentation essentially abound the lower part of Vindhyan sedimentation (Semri Formation); the upper Vindhyan evolved in an essentially tectonic quiescent sag mode (Chanda and Bhattacharya 1982;Chakraborty 2006). Considering the initiation of the Vindhyan basin on a rifted basement the evolution of the basin seems to be more complicated than the simple sag motif.…”

Section: Basin Tectonics and Role Of In-plane Horizontal Stressmentioning

confidence: 77%

Slides, soft-sediment deformations, and mass flows from Proterozoic Lakheri Limestone Formation, Vindhyan Supergroup, central India, and their implications towards basin tectonics

Chakraborty

2010

Facies

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The Neoproterozoic Lakheri Limestone (LL) Member of Vindhyan Supergroup, central India, interpreted as a low-gradient homoclinal ramp, contains a wide range of signatures indicating syn-sedimentary basinal extension and compression. Whereas features like intraformational truncation (slide) surfaces of varying geometry, creep and bedding translation manifest the phases of extension, the compressional events are registered in bed-conWned thrusts and outcrop-scale folds. A wide range of outcrop and microscopic deformational features are associated with the sliding events, the expressions of which vary based on their relative position with respect to the slide surface (over-or underlying) and the degree of built-up pore water pressure. The detached sediment mass often evolved in the form of mass Xows with rheology varying between cohesive debris Xow and low-density turbidity current. In particular, operation of reXected turbiditic Xows is suggestive of irregular depositional substrate, induced by curvilinear syn-sedimentary slides in otherwise low-gradient distal shelf platformal setting. The present study intends to relate the observed extensional and compressional features of LL succession with the Xexural response of early rifted Vindhyan basement under reversing in-plane stress in its post-rift depositional history. Bipolar NE-SW orientation of the slide planes is well consistent with the proposed rifted conWguration of Vindhyan basement. Centimeter-to decimeter-deep slide detachments and equally thick mass-Xow beds are indicative of relatively deeper level of necking during the early syn-rift phase of Vindhyan history.

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Proterozoic intracontinental basin: The Vindhyan example

Abstract: TST-alluvial fan-fan delta-shelf (Deoland and Arangi Formations) • HST-carbonate ramp (Kajrahat Formation

Cited by 70 publications

References 27 publications

Precise age of Bangiomorpha pubescens dates the origin of eukaryotic photosynthesis

Precise age of Bangiomorpha pubescens dates the origin of eukaryotic photosynthesis

The Dhala structure, Bundelkhand craton, Central India—Eroded remnant of a large Paleoproterozoic impact structure

Slides, soft-sediment deformations, and mass flows from Proterozoic Lakheri Limestone Formation, Vindhyan Supergroup, central India, and their implications towards basin tectonics

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