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Mesoproterozoic 40Ar/39Ar Age and Sr–Nd Isotopic Geochemistry of Calc-alkaline Lamprophyre fromthe Mudigubba Area, Eastern Dharwar Craton, India


Affiliations
1 Department of Geology, Institute of Science, Banaras Hindu University, Varanasi 221 005, India
2 Centre for Earth Sciences, Indian Institute of Science, Bengaluru 560 012, India
 

We report a 40Ar/39Ar Mesoproterozoic radiometric age for a calc-alkaline lamprophyre dyke from the Mudigubba area towards the western margin of the Cuddapah Basin, Eastern Dharwar Craton (EDC), Southern India. Amphibole phenocryst separates from this lamprophyre yielded a plateau age of 1169 ± 8 Ma (2σ ), which is almost 50 million years older than the majority of radiometric dates available for the Wajrakarur field kimberlites which are proximal to this dyke. Bulk-rock Sr–Nd isotopic analyses of the Mudigubba lamprophyre dykes (εNd(t) between –13.3 and –12.4) reveal their derivation from an old, enriched, continental lithospheric mantle unlike the kimberlites (bulk-rock and perovskite in situ εNd(t)) between –0.77 and +7.93), which originated either from a chondritic or depleted mantle source. This study provides further evidence for emplacement of compositionally distinct, mantle-derived Mesoproterozoic alkaline magmas in the EDC and highlights the extremely heterogeneous character of the lithospheric mantle beneath this craton.

Keywords

Alkaline Magma, Lamprophyre Dyke, Lithospheric Mantle, Kimberlites, Radiometric Age.
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  • Mesoproterozoic 40Ar/39Ar Age and Sr–Nd Isotopic Geochemistry of Calc-alkaline Lamprophyre fromthe Mudigubba Area, Eastern Dharwar Craton, India

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Authors

Ashutosh Pandey
Department of Geology, Institute of Science, Banaras Hindu University, Varanasi 221 005, India
N. V. Chalapathi Rao
Department of Geology, Institute of Science, Banaras Hindu University, Varanasi 221 005, India
Ramananda Chakrabarti
Centre for Earth Sciences, Indian Institute of Science, Bengaluru 560 012, India

Abstract


We report a 40Ar/39Ar Mesoproterozoic radiometric age for a calc-alkaline lamprophyre dyke from the Mudigubba area towards the western margin of the Cuddapah Basin, Eastern Dharwar Craton (EDC), Southern India. Amphibole phenocryst separates from this lamprophyre yielded a plateau age of 1169 ± 8 Ma (2σ ), which is almost 50 million years older than the majority of radiometric dates available for the Wajrakarur field kimberlites which are proximal to this dyke. Bulk-rock Sr–Nd isotopic analyses of the Mudigubba lamprophyre dykes (εNd(t) between –13.3 and –12.4) reveal their derivation from an old, enriched, continental lithospheric mantle unlike the kimberlites (bulk-rock and perovskite in situ εNd(t)) between –0.77 and +7.93), which originated either from a chondritic or depleted mantle source. This study provides further evidence for emplacement of compositionally distinct, mantle-derived Mesoproterozoic alkaline magmas in the EDC and highlights the extremely heterogeneous character of the lithospheric mantle beneath this craton.

Keywords


Alkaline Magma, Lamprophyre Dyke, Lithospheric Mantle, Kimberlites, Radiometric Age.

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DOI: https://doi.org/10.18520/cs%2Fv119%2Fi7%2F1142-1148