Explosive felsic volcanism at Palaeo-Mesoproterozoic boundary from Vindhyan Supergroup, Son Valley, Central India—Evidences of crustal contamination

The intrabasinal felsic pyroclastics and rhyolite in the lower part of Semri Group of Vindhyan Supergroup are intruded by 3-11 m thick mafic plugs. These mafic bodies intrude Kajrahat Limestone of Semri Group. Earlier studies pertaining to these dykes are restricted to petrography; however, geochemical data on these rocks are lacking. Ca-plagioclase, augite, and enstatite-bearing dolerites show sub-alkaline nature with basaltic andesitic (52-56% SiO 2 ) composition. They exhibit moderate incompatible trace elemental enrichment, characterized by enriched LREE and depleted HREE [(La/Yb) N = 3.5-5.7] contents akin to those reported from the intraplate continental rift-related basalts. Moreover, high Ba, Th, U together with the low Nb, Ta, and Ti values suggests crustal contamination. Chondrite-normalized REE patterns and trace element ratios when compared to continental rift basalts show similarity with them.Th/Ta and La/Yb discriminant diagram represents mixed sources and characterizes the occurrence in the sub-continental lithosphere. High La/Nb, La/Ta ratios, and positive Eu anomaly indicate that the basalt was derived from a depleted mantle source but mixed with crustal components. It is further supported by the ratios of Yb/Ta, Nb/Ta, and Zr/Hf indicating crustal contamination. In this article, we report the petrological and geochemical characteristics for the bimodal volcanics in order to understand their magma source and implications on tectonic setting in the lower part of Vindhyan Basin.

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Petrology and geochemistry of mafic plugs associated with the Semri Group of the Vindhyan Supergroup in the eastern part of the Son valley, Central India: Implications for bimodal volcanism

Mageswarii

Mishra

Shrivastava

2021

Geological Journal

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Significance of the tuffaceous beds associated with the Bijaigarh Shale of the Kaimur Group, Vindhyan Supergroup, Central India and their correlation with tuffs in other contemporaneous Proterozoic basins

Sen

Mishra

2019

J Earth Syst Sci

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Bijaigarh Formation is lithologically heterogeneous with grain size varying from fine to medium sand to clay. About *1 m thick tuffaceous beds of rhyolitic to rhyodacitic nature, sandwiched between the Bijaigarh siliciclastics have been reported. We have attempted to distinguish the tuffaceous beds from the adjacent terrigenous sediments of Bijaigarh Shale on the basis of their field disposition, petrographic and geochemical characteristics. The tuffs are characterised by a relatively high content of LILE, HFSE and LREE as compared to Bijaigarh siliciclastics. They reflect their affinity to the felsic magmatic source. The geochemical signatures of the Bijaigarh tuff exhibit quite comparable characters to the contemporaneous (*1000 Ma) tuffs from other Proterozoic basins, viz., Chhattisgarh and Indravati. The extrabasinal sources for the deposition of the Bijaigarh tuff at *1000 Ma can be inferred which can possibly be correlated with tectonothermal events of the Grenville orogeny. The integration of elemental compositions with mineralogical and textural observations makes possible the establishment of the tuffaceous beds as a stratigraphic marker in the Upper Vindhyan stratigraphy. This will have wider implications for the precise and reliable correlations of the Proterozoic basins of India.

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Evidences of felsic volcanism and hydrothermal activities from clays associated with the Palaeoproterozoic Porcellanite Formation of the Vindhyan Supergroup, Central India

et al. 2019

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Explosive felsic volcanism at Palaeo-Mesoproterozoic boundary from Vindhyan Supergroup, Son Valley, Central India—Evidences of crustal contamination

Cited by 7 publications

References 31 publications

Petrology and geochemistry of mafic plugs associated with the Semri Group of the Vindhyan Supergroup in the eastern part of the Son valley, Central India: Implications for bimodal volcanism

Petrology and geochemistry of mafic plugs associated with the Semri Group of the Vindhyan Supergroup in the eastern part of the Son valley, Central India: Implications for bimodal volcanism

Significance of the tuffaceous beds associated with the Bijaigarh Shale of the Kaimur Group, Vindhyan Supergroup, Central India and their correlation with tuffs in other contemporaneous Proterozoic basins

Evidences of felsic volcanism and hydrothermal activities from clays associated with the Palaeoproterozoic Porcellanite Formation of the Vindhyan Supergroup, Central India

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