Petrology and geochemistry of diamondiferous Mesoproterozoic kimberlites from Wajrakarur kimberlite field, Eastern Dharwar craton, southern India: genesis and constraints on mantle source regions

2008 ◽  
Vol 157 (2) ◽  
pp. 245-265 ◽  
Author(s):  
N. V. Chalapathi Rao ◽  
Rajesh K. Srivastava
Keyword(s):  
Mantle Source ◽  
Dharwar Craton ◽  
Southern India ◽  
Eastern Dharwar Craton ◽  
Source Regions ◽  
Petrology And Geochemistry ◽  
Kimberlite Field

Petrogenesis of an alkaline lamprophyre (camptonite) with ocean island basalt (OIB)-affinity at the NW margin of the Cuddapah basin, eastern Dharwar craton, southern India

2019 ◽  
Vol 196 (2) ◽  
pp. 149-177 ◽  
Author(s):  
Rohit Kumar Giri ◽  
Praveer Pankaj ◽  
N.V. Chalapathi Rao ◽  
Ramananda Chakrabarti ◽  
Dinesh Pandit
Keyword(s):  
Mantle Source ◽  
Dharwar Craton ◽  
Southern India ◽  
Striking Similarity ◽  
Cuddapah Basin ◽  
Eastern Dharwar Craton ◽  
Calc Alkaline ◽  
Western Margin ◽  
Ocean Island ◽  
Alkaline Lamprophyres

We report petrology and geochemistry (including Sr and Nd isotopes) of a fresh lamprophyre at Ankiraopalli area at the north-western margin of Paleo-Mesoproterozoic Cuddapah basin, eastern Dharwar craton, southern India. Ankiraopalli samples possess a typical lamprophyre porphyritic-panidiomorphic texture with phenocrysts of kaersutite and diopside set in a plagioclase dominant groundmass. Combined mineralogy and geochemistry classify it as alkaline lampro- phyre in general and camptonite in particular. Contrary to the calc-alkaline and/or shoshonitic orogenic nature portrayed by lamprophyres occurring towards the western margin of the Cuddapah basin, the Ankiraopalli samples display trace element composition revealing striking similarity with those of ocean island basalts, Italian alkaline lamprophyres and highlights an anorogenic character. However, the87 Sr/86 Srinitial (0.710316 to 0.720016) and εNdinitial (– 9.54 to – 9.61) of the Ankiraopalli lamprophyre show derivation from an 'enriched' mantle source showing long term enrichment of incompatible trace elements and contrast from those of (i) OIB, and (ii) nearby Mahbubnagar alkaline mafic dykes of OIB affinity. Combining results of this study and recent advances made, multiple mantle domains are identified in the Eastern Dharwar craton which generated distinct Mesoproterozoic lamprophyre varieties. These include (i) Domain I, involving sub-continental lithospheric mantle source essentially metasomatized by subduction-derived melts/fluids (represented by orogenic calcalkaline and/or shoshonitic lamprophyres at the Mudigubba, the Udiripikonda and the Kadiri); (ii) Domain II, comprising a mixed sub-continental lithospheric and asthenospheric source (represented by orogenic-anorogenic, alkaline to calc-alkaline transitional lamprophyres at the Korakkodu), and (iii) Domain III, representing a sub-continental lithospheric source with a dominant overprint of an asthenospheric (plume) component (represented by essentially alkaline lamprophyres at the Ankiraopalli). Our study highlights the varied mantle source heterogeneities and complexity of geodynamic processes involved in the Neoarchean-Paleo/Mesoproterozoic evolution of the Eastern Dharwar craton.

scholarly journals Mineralogy and petrology of shoshonitic lamprophyre dykes from the Sivarampeta area, diamondiferous Wajrakarur kimberlite field, Eastern Dharwar craton, southern India

2020 ◽  
Vol 115 (2) ◽  
pp. 202-215
Author(s):  
Praveer PANKAJ ◽  
Rohit Kumar GIRI ◽  
N.V. CHALAPATHI RAO ◽  
Ramananda CHAKRABARTI ◽  
Sneha RAGHUVANSHI
Keyword(s):  
Dharwar Craton ◽  
Southern India ◽  
Eastern Dharwar Craton ◽  
Kimberlite Field

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

2019 ◽  
Vol 54 (5) ◽  
pp. 3060-3077 ◽  
Author(s):  
Sneha Raghuvanshi ◽  
Ashutosh Pandey ◽  
Praveer Pankaj ◽  
N.V. Chalapathi Rao ◽  
Ramananda Chakrabarti ◽  
...  
Keyword(s):  
Dharwar Craton ◽  
Southern India ◽  
Eastern Dharwar Craton ◽  
Kimberlite Field
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