Petrogenesis of a Mesoproterozoic shoshonitic lamprophyre dyke from the Wajrakarur kimberlite field, eastern Dharwar craton, southern India: Geochemical and Sr-Nd isotopic evidence for a modified sub-continental lithospheric mantle source

Pandey, Ashutosh; Rao, N. V. Chalapathi; Chakrabarti, Ramananda; Pandit, Dinesh; Pankaj, Praveer; Kumar, Alok; Sahoo, Samarendra

doi:10.1016/j.lithos.2017.09.001

Cited by 54 publications

(52 citation statements)

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“…Multiple convergence of Cratonic microblocks during Dharwar Craton assembly at the end of the Neoarchean, leaving behind the greenstone belts as zones of palaeo‐ocean closure, is also envisaged in a recent study (Santosh & Li, ). The Neoarchean T DM Nd model ages of the lamprophyres (~2.6 Ga; Pandey, Chalapathi Rao, Chakrabarti, et al, ) are consistent with this convergence and can be considered as the timing of metasomatism, or the veining of lithospheric mantle by subduction‐derived melts that contributed to the generation of the lamprophyres.…”

Section: Geodynamic Constraintsmentioning

confidence: 60%

“…KLF: Krishna lamproite field; MUD: Mudigubba lamprophyre; NKF: Narayanpet kimberlite field; RKF: Raichur kimberlite field; WKF: Wajrakarur kimberlite field. (b) Geological map of Wajrakarur–Lattavaram cluster of Wajrakarur kimberlite field showing location of the lamprophyres of this study (after Pandey, Chalapathi Rao, Chakrabarti, et al, ) [Colour figure can be viewed at wileyonlinelibrary.com]…”

Section: Geological Settingmentioning

confidence: 99%

“…New Sr and Nd isotopic analyses for the SPL and the UKL along with the data of Pandey, Chalapathi Rao, Chakrabarti, et al, () are given in Tables and . Age‐corrected Sr and Nd isotopic compositions are generally higher ( 87 Sr/ 86 Sr (i) > 0.705) and lower ( 143 Nd/ 144 Nd (i) < 0.51052) than for coeval kimberlites (Figure ) of the WKF (Dongre, Viljoen, Malandkar, & Le Roux, ).…”

Section: Major and Trace Element Geochemistrymentioning

confidence: 99%

“…Based on Rb–Sr isochron dating, the SPL and UKL lamprophyres of the WKF are considered to be synchronous with 1.1 Ga kimberlites occurring in their general vicinity (Pandey, Chalapathi Rao, Chakrabarti, et al, ). U–Pb isotope results obtained on 20 zircons in the present study and which were recovered from the UKL are given in Table and Figure .…”

Section: U–pb Zircon Datingmentioning

confidence: 99%

“…In contrast, rare co‐existing lamprophyre dykes which belong to the same (diamondiferous) magmatic event as the kimberlites, and which are therefore of similar petrogenetic significance, have received far less attention and their origin remains enigmatic. Pandey et al () reported on the mineralogy and geochemistry of one of these intrusives in the WKF, the Udiripikonda lamprophyre, and suggested that its genesis may be related to regional lithospheric extension in the Mesoproterozoic. Comparable associations of alkaline and calc‐alkaline lamprophyres, with diamondiferous kimberlites, have previously been reported from other regions such as the Kaapvaal Craton of South Africa (Mitchell, ).…”

Section: Introductionmentioning

confidence: 99%

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Petrogenesis of lamprophyres synchronous to kimberlites from the Wajrakarur kimberlite field: Implications for contrasting lithospheric mantle sources and geodynamic evolution of the eastern Dharwar Craton of southern India

et al. 2018

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Kimberlite field is an example of widespread Mesoproterozoic intracontinental magmatism. Recent studies have identified deep subcontinental lithospheric mantle as a source region of the kimberlite magmatism while timing, origin, and processes responsible for the generation of coeval lamprophyres remain poorly constrained. Here, we present and discuss new petrological and geochemical data for two lamprophyre dykes from the Wajrakarur kimberlite field and assess their petrogenetic relation to the kimberlite occurrences. Based on mineral compositional and whole‐rock geochemical characters, it is suggested that lamprophyres are formed through low degrees of partial melting of “enriched” lithospheric mantle that was modified and metasomatized by melts derived from recycled crust. This differs from geochemical imprints found in coeval kimberlites, where a crustal source component appears to be absent and is more consistent with rock derivation from “depleted” lithosphere which has experienced interaction with asthenosphere‐derived melts. An apparent lack of garnet in the mantle sources of lamprophyres is suggestive of melting at comparatively shallow depth (~100 km) relative to the kimberlites. Hence, these geochemically contrasting rocks, although have formed at the same time, are derived from vertically heterogeneous lithospheric mantle sources and can be explained through and linked with a thermal anomaly in the underlying convective asthenosphere. We suggest that the deeper mantle source region of the kimberlites was more pristine and devoid of subduction‐related signatures, whereas the shallower mantle source region of the lamprophyres seems to have preserved imprints of plate convergence and subduction associated with the evolution of the Dharwar Craton.

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Section: Geodynamic Constraintsmentioning

confidence: 60%

Section: Geological Settingmentioning

confidence: 99%

Section: Major and Trace Element Geochemistrymentioning

confidence: 99%

Section: U–pb Zircon Datingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Petrogenesis of lamprophyres synchronous to kimberlites from the Wajrakarur kimberlite field: Implications for contrasting lithospheric mantle sources and geodynamic evolution of the eastern Dharwar Craton of southern India

et al. 2018

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Lithosphere–asthenosphere interaction and carbonatite metasomatism in the genesis of Mesoproterozoic shoshonitic lamprophyres at Korakkodu, Wajrakarur kimberlite field, Eastern Dharwar Craton, southern India

et al. 2019

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The spatial and temporal association between lamprophyres and kimberlites provides unique opportunities to explore their genetic relationships. This paper explores such a relationship by detailing mineralogical and geochemical aspects of Korakkodu lamprophyre dykes located within the well‐known Mesoproterozoic diamondiferous Wajrakarur Kimberlite field (WKF), towards the south‐western margin of Paleo–Mesoproterozoic Cuddapah Basin, Eastern Dharwar Craton, southern India. Mineralogy reveals that these dykes belong to calc‐alkaline variety of lamprophyres, but their geochemistry display mixed signals of both alkaline and calc‐alkaline lamprophyres. These lamprophyres are highly potassic, and their high Al2O3 and low‐TiO2 content implies a shoshonitic character. Low Mg#, Ni, and Cr concentration highlight their evolved nature. High (La/Yb)N and (Gd/Yb)N content is consistent with their derivation from low degrees of partial melting, whereas highly fractionated nature suggests the presence of garnet in their source. Absence of prominent Nb‐Ta anomaly implies to the dilution of lithospheric mantle source by melts rich in HFSEs and low La/Nb ratio compared to those of the calc‐alkaline island arc volcanics and suggests an asthenospheric overprint on lithospheric mantle source. Carbonatite metasomatism in the source region of these lamprophyres is apparent from conspicuously high‐Zr/Hf ratio, and the HFSE budget of these lamprophyres are principally controlled by the presence of phlogopite veins in their lithospheric source. An extremely heterogeneous and layered lithospheric mantle beneath Eastern Dharwar Craton has been inferred from the divergent genetic history of Mesoproterozoic lamprophyres and kimberlites in the Wajrakarur field.

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Redox series assessment, petrogenetic, and geodynamic appraisal of Neoarchean granites from the Bundelkhand Craton, Central India: Constraints from phase petrology and bulk rock geochemistry

Kumar

Mohan

2021

Geological Journal

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Based on field relationships, microstructure, phase petrology, and whole‐rock elemental geochemistry, we have unravelled the redox conditions and petrogenetic evolution of Neoarchean granites (sensu lato) from the central part of the Bundelkhand Craton, Central India. The studied Neoarchean granites are sanukitoids (sensu lato), high‐K, low‐magnesian granites (HKLMG), and oxidized A‐type granites (OAG). Chemistry of biotite in conjunction with amphibole compositions from sanukitoids indicates their crystallization in calc‐alkaline felsic host magma formed in a subduction setting at elevated fugacity of oxygen (fO2), buffered at +2 fayalite‐magnetite‐quartz (FMQ), corresponding to magnetite series granite. Chemistry of biotite and amphiboles from HKLMG suggests that host melts of these phases buffered above +1 FMQ, that is, moderate fO2 condition corresponding to magnetite series granites. The nature of the HKLMG magma is peraluminous to alkaline which originated at a relatively high‐P condition. The biotites from OAG exhibit pronounced Al‐Fe substitution buffered above +0.5 FMQ to represent oxidized A‐type host granite magma, belonging to magnetite series granite. The sanukitoids bear high ferromagnesian minerals (FeOt + MgO + MnO + TiO2 (FMMT) >4.5; Mg# = 28–45), and enriched incompatible elements without significant Eu anomalies, probably originated from melt‐enriched mantle source in a subduction setting. The HKLMG are characterized by relatively low Mg#, TiO2, high K‐LILEs‐REEs with negative Eu anomalies, and high Th/Nb, Ce/Pb, and La/Nb ratios, which suggest mixed source signatures, derived from the enriched mantle and continental crust. A‐type granites (OAG) bear high NK/A (molar Na2O + K2O/Al2O3 ~ 1.17), FeOt/MgO, K2O/Na2O, Ga/Al, and Ce–Y, which indicate the emplacement of OAG magmas in syn‐ to post‐collisional tectonic environments. Thus, the Neoarchean granites from the Bundelkhand Craton represent a collage of subduction related sanukitoids to high‐K magnesian granites, and syn‐ to post‐collisional oxidized A‐type granites.

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Petrogenesis of a Mesoproterozoic shoshonitic lamprophyre dyke from the Wajrakarur kimberlite field, eastern Dharwar craton, southern India: Geochemical and Sr-Nd isotopic evidence for a modified sub-continental lithospheric mantle source

Cited by 54 publications

References 103 publications

Petrogenesis of lamprophyres synchronous to kimberlites from the Wajrakarur kimberlite field: Implications for contrasting lithospheric mantle sources and geodynamic evolution of the eastern Dharwar Craton of southern India

Petrogenesis of lamprophyres synchronous to kimberlites from the Wajrakarur kimberlite field: Implications for contrasting lithospheric mantle sources and geodynamic evolution of the eastern Dharwar Craton of southern India

Lithosphere–asthenosphere interaction and carbonatite metasomatism in the genesis of Mesoproterozoic shoshonitic lamprophyres at Korakkodu, Wajrakarur kimberlite field, Eastern Dharwar Craton, southern India

Redox series assessment, petrogenetic, and geodynamic appraisal of Neoarchean granites from the Bundelkhand Craton, Central India: Constraints from phase petrology and bulk rock geochemistry

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