Subduction – tectonics in the evolution of the eastern Dharwar craton, southern India: Insights from the post-collisional calc-alkaline lamprophyres at the western margin of the Cuddapah basin

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

doi:10.1016/j.precamres.2017.06.004

Cited by 53 publications

(30 citation statements)

References 82 publications

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“…(b) Ca (a.p.f.u) versus Ti (a.p.f.u) tectonic discrimination diagram (after Sun & Bertrad, ) for clinopyroxenes suggesting dominantly non‐orogenic affinity. Data sources: Cuddapah intrusive province lamprophyres (Madhvan et al, ), Mudigubba lamprophyre (Pandey, Chalapathi Rao, Dhote, et al, ), ultramafic lamprophyre of Kutch (Pandey, Chalapathi Rao, Pandit, et al, ), and Deccan lamprophyres (Chalapathi Rao, Wu, Mitchell, Li, & Lehmann, ; Hari, ) [Colour figure can be viewed at wileyonlinelibrary.com]…”

Section: Petrography and Mineral Compositionsmentioning

confidence: 99%

“…Petrological aspects such as rock petrography, mineral chemistry, geochemistry, and isotopic compositions (Sr and Nd) are considered with comparison made with other previously recognized and studied analogous rock types from other (different) tectonic settings on the Indian subcontinent. Lamprophyres included in the comparison comprises those of the Cuddapah intrusive province (Madhvan, David, Rao, Chalapathi Rao, & Srinivas, ), the Mudigubba lamprophyre (Pandey, Chalapathi Rao, Dhote, et al, ), the Kutch ultramafic lamprophyre (Pandey, Chalapathi Rao, Pandit, et al, ), and various Deccan lamprophyres (Chalapathi Rao, Dharma Rao, & Das, ; Hari, ). A review of recently reported lamprophyre dykes from the Dharwar Craton and the Deccan province is also presented.…”

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: Petrography and Mineral Compositionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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“…2.52–2.51 Ga) and brought the magma to shallower level through deep shear zone and fault system. A recent geochemical study of the lamprophyric rocks of EDC also support the Neoarchean subduction model (Pandey et al, ). It is known that subduction of Archean oceanic crust would produce TTG‐type magma and vast granitic suites exposed in the southern and western part of the EDC (Jayananda et al, ; Moyen, Martin, et al, ) support this model.…”

Section: Discussionmentioning

confidence: 88%

Geochronological and geochemical signatures of the granitic rocks emplaced at the north‐eastern fringe of the Eastern Dharwar Craton, South India: Implications for late Archean crustal growth

et al. 2017

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Geochemical and zircon U–Pb age data on granites of the Chitrial area, situated at the NE part of the Eastern Dharwar Craton, are presented to elucidate their petrogenesis, time(s) of emplacement, and role in crust formation. Based on field and geochemical characters, these granites are classified as alkali feldspar/monzo‐granite. Whole‐rock data of selected samples show evolved calc‐alkaline and peraluminous characters with high SiO2, K2O, large‐ion lithophile element, and light rare earth elements (LREE), depleted heavy rare earth elements (HREE) and strongly negative Eu anomaly. One sample shows slightly different character with low SiO2, enriched light rare earth elements, and depleted heavy rare earth elements without Eu anomaly. Geochemical analyses suggest that the rocks are S‐type granite with syn‐collisional and volcanic arc signatures. These granites define a coherent trend favouring low pressure crystallization of the magma. U–Pb zircon data show that the crystallization ages of the granites vary within 2514 ± 10 to 2525 ± 24 Ma. The geodynamic evolution of the Eastern Dharwar Craton is discussed wherein subduction and deep burial of sediment is envisaged to cause partial melting and granite genesis in the craton.

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“…(a) Al 2 O 3 vs. TiO 2 (wt%) variation diagram for the studied lamprophyres, which plot close to the global calc‐alkaline lamprophyres (Lefebvre, Kopylova, & Kivi, ). Data for MUD (Mudigubba) is taken from Pandey, Chalapathi Rao, Pandit, et al (). (b) Co (ppm)–Th (ppm) variation diagram (after Hastie, Kerr, Pearce, & Mitchell, ) classifying studied samples as shoshonitic to calc‐alkaline with compositions similar to basaltic andesites/andesites [Colour figure can be viewed at wileyonlinelibrary.com]…”

Section: Resultsmentioning

confidence: 99%

“…Numerous deep mantle derived alkaline rocks such as lamprophyres, lamproites, kimberlites, and their entrained eclogitic xenoliths have been used as proxies to understand the nature and evolution of the SCLM beneath the Eastern Dharwar Craton (EDC) in the past decade or so (e.g., Chalapathi Rao, Gibson, Pyle, & Dickin, ; Chakrabarti, Basu, & Paul, ; Chalapathi Rao, Wu, Mitchell, Li, & Lehmann, ; Dongre, Jacob, & Stern, ; Pandey, Chalapathi Rao, Pandit, et al, ; Pandey, Chalapathi Rao, Chakrabarti, et al, ; Patel, Thakur, Rao, & Subbarao, ; Patel et al, ). Recently, Pandey, Chalapathi Rao, Chakrabarti, et al () have shown that although the shoshonitic lamprophyres are coeval and cospatial with the Mesoproterozoic diamondiferous kimberlites from the Wajrakarur kimberlite field (WKF), they are not genetically related.…”

Section: Introductionmentioning

confidence: 99%

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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Subduction – tectonics in the evolution of the eastern Dharwar craton, southern India: Insights from the post-collisional calc-alkaline lamprophyres at the western margin of the Cuddapah basin

Cited by 53 publications

References 82 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

Geochronological and geochemical signatures of the granitic rocks emplaced at the north‐eastern fringe of the Eastern Dharwar Craton, South India: Implications for late Archean crustal growth

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

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