Geology, petrology, and geochemistry of the Mesoproterozoic Kaimur Group of rocks of the Vindhyan Supergroup, Eastern India: implications for depositional environment and sequence stratigraphy

Yadav, Pawan Kumar; Das, Manorama; Ray, Sukhendu

doi:10.1007/s43217-022-00105-7

Cited by 2 publications

(2 citation statements)

References 49 publications

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“…Vertical joints trending NE-SW and NW-SE, small-scale folds, fault, and slickensides are also recorded in the eastern part of the Vindhyan basin. The average palaeocurrent direction as recorded from the current bedding and ripple marks points towards NW (Yadav et al 2022c).…”

Section: Regional Geological Settingmentioning

confidence: 99%

“…This basin comprises of approximately 4000m thick sequence of largely undeformed rocks comprising shales, sandstones, limestones, and dolostones with subordinate felsic volcanics, lying on top of the deformed metasediments of both Bijawar/Mahakoshal Group and the Archaean gneissic basement (Bose et al 2001;Ray and Chakraborty 2006). It covers a long period of sedimentation history spanning (~1800-500 Ma) during the Proterozoic eon (Quasim et al 2017;Yadav et al 2022c). The rocks of the Vindhyan Supergroup are divided into three outcrop sectors, namely, the Bundelkhand sector, the Son valley sector, and the Rajasthan sector (Chakraborty et al 2010;Mandal et al 2019).…”

Section: Introductionmentioning

confidence: 99%

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Geochemistry of an intercalated unit of arkose and shale of the Dhandraul Formation belonging to the Vindhyan Supergroup, Eastern India: Insights from provenance, depositional environment, and geodynamic set-up

Yadav

Das

2023

J. Sediment. Environ.

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In this study, we have presented a hitherto unreported mappable member of an intercalated unit of arkose and shale of the Dhandraul Formation of the Kaimur Group exposed in Kaimur district, Bihar, India which was not reported by earlier workers in the Vindhyan basin. It is a contribution for understanding the possible provenance, source area weathering, depositional environment, and geodynamic set-up of this member. Based on eld characteristics and petrography study, three lithofacies units have been identi ed viz. (i) coarse to medium-grained arkose, (ii) intercalated sequence of arkose and shale, and (iii) shale.Geochemically, these lithofacies predominantly occupied the eld of arkose and shale except samples fall in the eld of sub-arkose. These lithofacies display relatively an enrichment of SiO 2 and Al 2 O 3 and show low concentrations of MgO, CaO, Na 2 O, K 2 O, and TiO 2 . The values of ∑REE in arkose are varying from 78.74 to 128.81 ppm whereas the values of fractionation indicate (La/Sm) N (3.73-4.22), (La/Yb) N (7.33-15.59),(Gd/Yb) N (1.32-2.30), and Eu/Eu* (0.58-0.66). In shale, ∑REE ranges from 354.02 to 382.11 ppm while the fractionation contents of (La/Sm) N , (La/Yb) N , and (Gd/ Yb) N , and Eu/Eu* are ranging from 3.82 to 4.82, 7.65 to 11.85, 1.38 to 1.73, and 0.56 to 0.81. On the basis of rock fragments and paleocurrent direction, the possible sources are presumed to be the Chhotanagpur Gneissic Complex and the Mahakoshal Group of rocks, which lie towards the south and southwest. In the binary and ternary plots, most of the samples of arkose and shale have mostly occupied the eld of passive margin tectonic setting except one sample comes in the eld of the continental island arc. Based on mineralogical and textural maturity, sedimentary structures and the overall sequence of these lithofacies from sandstone to shale member of the Dhandraul Formation show ning upward sequence which attributes the deposition in a shallow coastal uvial-marine environment in a transgressive phase. This discovery has opened a new opportunity to relook at the depositional environment of the Dhandraul Formation in other parts of the Vindhyan basin.

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Section: Regional Geological Settingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Geochemistry of an intercalated unit of arkose and shale of the Dhandraul Formation belonging to the Vindhyan Supergroup, Eastern India: Insights from provenance, depositional environment, and geodynamic set-up

Yadav

Das

2023

J. Sediment. Environ.

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show abstract

Geochemistry of an intercalated unit of arkose and shale of the Dhandraul Formation belonging to the Vindhyan Supergroup, Eastern India: Insights from provenance, depositional environment, and geodynamic set-up

Yadav

Das

2023

Preprint

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In this study, we have presented a hitherto unreported mappable member of an intercalated unit of arkose and shale of the Dhandraul Formation of the Kaimur Group exposed in Kaimur district, Bihar, India which was not reported by earlier workers in the Vindhyan basin. It is a contribution for understanding the possible provenance, source area weathering, depositional environment, and geodynamic set-up of this member. Based on field characteristics and petrography study, three lithofacies units have been identified viz. (i) coarse to medium-grained arkose, (ii) intercalated sequence of arkose and shale, and (iii) shale. Geochemically, these lithofacies predominantly occupied the field of arkose and shale except samples fall in the field of sub-arkose. These lithofacies display relatively an enrichment of SiO2 and Al2O3 and show low concentrations of MgO, CaO, Na2O, K2O, and TiO2. The values of ∑REE in arkose are varying from 78.74 to 128.81 ppm whereas the values of fractionation indicate (La/Sm)N (3.73-4.22), (La/Yb)N (7.33-15.59), (Gd/Yb)N (1.32-2.30), and Eu/Eu* (0.58-0.66). In shale, ∑REE ranges from 354.02 to 382.11 ppm while the fractionation contents of (La/Sm)N, (La/Yb)N, and (Gd/ Yb)N, and Eu/Eu* are ranging from 3.82 to 4.82, 7.65 to 11.85, 1.38 to 1.73, and 0.56 to 0.81. On the basis of rock fragments and paleocurrent direction, the possible sources are presumed to be the Chhotanagpur Gneissic Complex and the Mahakoshal Group of rocks, which lie towards the south and southwest. In the binary and ternary plots, most of the samples of arkose and shale have mostly occupied the field of passive margin tectonic setting except one sample comes in the field of the continental island arc. Based on mineralogical and textural maturity, sedimentary structures and the overall sequence of these lithofacies from sandstone to shale member of the Dhandraul Formation show fining upward sequence which attributes the deposition in a shallow coastal fluvial-marine environment in a transgressive phase. This discovery has opened a new opportunity to relook at the depositional environment of the Dhandraul Formation in other parts of the Vindhyan basin.

show abstract

Geology, petrology, and geochemistry of the Mesoproterozoic Kaimur Group of rocks of the Vindhyan Supergroup, Eastern India: implications for depositional environment and sequence stratigraphy

Cited by 2 publications

References 49 publications

Geochemistry of an intercalated unit of arkose and shale of the Dhandraul Formation belonging to the Vindhyan Supergroup, Eastern India: Insights from provenance, depositional environment, and geodynamic set-up

Geochemistry of an intercalated unit of arkose and shale of the Dhandraul Formation belonging to the Vindhyan Supergroup, Eastern India: Insights from provenance, depositional environment, and geodynamic set-up

Geochemistry of an intercalated unit of arkose and shale of the Dhandraul Formation belonging to the Vindhyan Supergroup, Eastern India: Insights from provenance, depositional environment, and geodynamic set-up

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