New Proterozoic KAr ages for some kimberlites and lamproites from the Cuddapah Basin and Dharwar Craton, South India: evidence for non-contemporaneous emplacement

Rao, N. V. Chalapathi; Miller, John A.; Pyle, David M.; Madhavan, V.

doi:10.1016/0301-9268(95)00105-0

Cited by 77 publications

(6 citation statements)

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“…The sediments in the Kurnool sub-basin were probably deposited later in the Mesoproterozoic, most likely after the emplacement of the kimberlites of the EDC at c . 1100 Ma (Kumar et al 1993, 2001; Chalapathi Rao et al 1996, 1999, 2013; Kumar, Heaman & Manikeyamba, 2007; Babu et al 2008), consistent with diamond occurrence in the Banganapalle Quartzite in the Kurnool sub-basin as well as with the report of Ediacaran fossils in the Owk Shale (Sharma & Shukla, 2012).…”

Section: Discussionsupporting

confidence: 56%

“…Other kimberlites could also be the source of the diamonds. However, all the known kimberlites in the area have late Mesoproterozoic ages (Kumar et al 1993, 2001; Chalapathi Rao et al 1996, 1999, 2013; Kumar, Heaman & Manikeyamba, 2007; Babu et al 2008), so if the occurrence of diamond in the Banganapalle Quartzite and that of sedimentary carbonate xenoliths in the kimberlites are to be reconciled with this, then the source of diamonds will apparently be the lamproites. Chalapathi Rao et al (2010) suggested lamproitic rocks analogous to the ~1417 Ma Chelima lamproites (Chalapathi Rao et al 1999) as the source of the diamonds in the Banganapalle Quartzite.…”

Section: Discussionmentioning

confidence: 99%

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New constraints from zircon, monazite and uraninite dating on the commencement of sedimentation in the Cuddapah basin, India

et al. 2017

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The Cuddapah basin in southern India, consisting of the Palnad, Srisailam, Kurnool and Papaghni sub-basins, contains unmetamorphosed and undeformed sediments deposited during a long span of time in the Proterozoic. In the absence of robust age constraints, there is considerable confusion regarding the relative timing of sedimentation in these sub-basins. In this study, U–Pb isotopic dating of zircon and U–Th–Pbtotaldating of monazite and uraninite from the gritty quartzite that supposedly belongs to the formation Banganapalle Quartzite have been used to constrain the beginning of sedimentation in the Palnad sub-basin. Magmatic and detrital zircons recording an age of 2.53 Ga indicate that the sediments were derived from the granitic basement or similar sources and were deposited after 2.53 Ga. Hydrothermally altered zircons both in the basement and the cover provide concordant ages of 2.32 and 2.12 Ga and date two major hydrothermal events. Thus, the gritty quartzite must have been deposited sometime between 2.53 and 2.12 Ga and represents the earliest sediments in the Cuddapah basin. Monazite and uraninite give a wide spectrum of ages between 2.5 Ga and 150 Ma, which indicates several pulses of hydrothermal activity over a considerable time span, both in the basement granite and the overlying quartzite. The new age constraints suggest that the gritty quartzite may be stratigraphically equivalent to the Gulcheru Quartzite that is the oldest unit in the Cuddapah basin, and that a sedimentary/erosional hiatus exists above it.

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Section: Discussionsupporting

confidence: 56%

Section: Discussionmentioning

confidence: 99%

New constraints from zircon, monazite and uraninite dating on the commencement of sedimentation in the Cuddapah basin, India

et al. 2017

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“…The chronology of the Purana successions has so far relied mainly on K-Ar dating of glauconitic minerals, or dating of intrusive igneous rocks, such as kimberlite pipes, dike swarms, or granitic bodies (Vinogradov et al, 1964;Tugarinov et al, 1965;Compston, 1970, 1973;Paul et al, 1975;Chaudhuri and Howard, 1985;Chaudhuri et al, 1989;Dobmeier et al, 2006;Chalapathi Rao et al, 1996;Naqvi, 2005;Ramakrishnan and Vaidyanadhan, 2008). Based on such studies, several Purana sequences have been considered to be Neoproterozoic in age (Gutzmer and Beukes, 1998;Chaudhuri et al, 1999, and references therein).…”

Section: Introductionmentioning

confidence: 97%

Constraints on the development of Proterozoic basins in central India from 40Ar/39Ar analysis of authigenic glauconitic minerals

Conrad

Hein

Chaudhuri

et al. 2010

Geological Society of America Bulletin

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Ages of some key stratigraphic sequences in central Indian Proterozoic basins are based predominantly on lithostratigraphic relationships that have been constrained by only a few radioisotopic dates. To help improve age constraints, single grains of glauconitic minerals taken from sandstone and limestone in two Proterozoic sequences in the Pranhita-Godavari Valley and the Chattisgarh basin were analyzed by the 40 Ar/ 39 Ar incremental heating method. Analysis of the age spectra distinguishes between ages that are interpreted to refl ect the time of glauconite formation, and anomalous ages that result from inherited argon or postcrystallization heating. The analyses indicate an age of 1686 ± 6 Ma for the Pandikunta Limestone and 1566 ± 6 Ma for the Ramgundam Sandstone, two units in the western belt of Proterozoic sequences in Pranhita-Godavari Valley. Glauconite from the Chanda Limestone, in the upper part of this sequence, contains inherited 40 Ar but is interpreted to refl ect an age of ca. 1200 Ma. Glauconite from the Somanpalli Group in the eastern belt of the Pranhita-Godavari Valley gives an age of 1620 ± 6 Ma. In the Chattisgarh basin, glauconite from two units gives disturbed ages that suggest a period of regional heating in the Chattisgarh basin at ca. 960-1000 Ma. These new ages indicate that these sequences are 200-400 m.y. older than previously recognized, which has important implications for geochemical studies of Mesoproterozoic ocean redox conditions in addition to providing important constraints on regional tectonics and lithostratigraphy.

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“…These greenstone belts represent a composite tectono‐stratigraphic terranes, accreted from plume‐derived and subduction‐derived volcanics comprising (a) minor komatiites, (b) high Mg–basalts, (C) andesites, (d) adakites, (e) rhyolites, and (f) lamprophyres (Jayananda et al, ; Manikyamba, Ganguly, Santosh, & Subramanyam, and references therein; Pandey et al, ). The Proterozoic rock successions of EDC constitute of mafic dike swarms, Cuddapah Basin, and potassic to ultrapotassic alkaline rocks (Chalapathi Rao, ; Chalapathi Rao, Miller, Pyle, & Madhavan, ; Chalapathi Rao, Miller, Gibson, Pyle, & Madhavan, ; Kumar, Heaman, & Manikyamba, , and references therein; Chalapathi Rao, Wu, et al, ). Recent studies show that the Eastern Dharwar Craton is furthur subdivided into central and eastern Dharwar Province (Dey, ; Jayananda et al, ; Jayananda, Santosh, & Aadhiseshan, ).…”

Section: Regional Geologymentioning

confidence: 99%

“…The Proterozoic rock successions of EDC constitute of mafic dike swarms, Cuddapah Basin, and potassic to ultrapotassic alkaline rocks (Chalapathi Rao, 2008;Chalapathi Rao, Miller, Pyle, & Madhavan, 1996;Chalapathi Rao, Miller, Gibson, Pyle, & Madhavan, 1999;Kumar, Heaman, & Manikyamba, 2007, and references therein;Chalapathi Rao, Wu, et al, 2013). Recent studies show that the Eastern Dharwar Craton is furthur subdivided into central and eastern Dharwar Province (Dey, 2013;Jayananda et al, 2013;Jayananda, Santosh, & Aadhiseshan, 2018).…”

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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New Proterozoic KAr ages for some kimberlites and lamproites from the Cuddapah Basin and Dharwar Craton, South India: evidence for non-contemporaneous emplacement

Cited by 77 publications

References 18 publications

New constraints from zircon, monazite and uraninite dating on the commencement of sedimentation in the Cuddapah basin, India

New constraints from zircon, monazite and uraninite dating on the commencement of sedimentation in the Cuddapah basin, India

Constraints on the development of Proterozoic basins in central India from 40Ar/39Ar analysis of authigenic glauconitic minerals

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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