Lead isotopic compositions of the Western Dharwar craton, southern India: Evidence for distinct Middle Archean terranes in a Late Archean craton

Meen, James K.; Rogers, John J. W.; Fullagar, Paul D.

doi:10.1016/0016-7037(92)90202-t

Cited by 131 publications

(54 citation statements)

References 26 publications

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“…The zircon ages of the WDC basement gneisses and the metasediments obtained in this study are consistent with those reported earlier for gneisses from Holenarasipur, Gorur-Hassan and Chikmagalur regions of the Dharwar craton (Beckinsale et al 1980;Taylor et al 1984;Meen et al 1992;Naha et al 1993;Peucat et al 1993). A span of crystallization ages ranging from 3.0 to 3.3 Ga for the orthogneiss protoliths are evident in the data presented here and those reported earlier suggests that episodic emplacement of the TTG suite in the WDC over a time span of few hundred million years.…”

Section: Zircon Ages: Western Dharwar Craton (Wdc)supporting

confidence: 92%

Pb–Pb zircon ages of Archaean metasediments and gneisses from the Dharwar craton, southern India: Implications for the antiquity of the eastern Dharwar craton

Bidyananda

Goswami

Srinivasan³

2011

J Earth Syst Sci

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207 Pb-206 Pb ages of zircons in samples of metasediments as well as ortho-and para-gneisses from both the western and the eastern parts of the Dharwar craton have been determined using an ion microprobe. Detrital zircons in metasedimentary rocks from both yielded ages ranging from 3.2 to 3.5 Ga. Zircons from orthogneisses from the two parts also yielded similar ages. Imprints of younger events have been discerned in the ages of overgrowths on older zircon cores in samples collected throughout the craton. Our data show that the evolution of the southwestern part of eastern Dharwar craton involved a significant amount of older crust (>3.0 Ga). This would suggest that crust formation in both the western and eastern parts of the Dharwar craton took place over similar time interval starting in the Mesoarchaean at ca. 3.5 Ga and continuing until 2.5 Ga. Our data coupled with geological features and geodynamic setting of the Dharwar craton tend to suggest that the eastern Dharwar craton and the western Dharwar craton formed part of a single terrane.

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Section: Zircon Ages: Western Dharwar Craton (Wdc)supporting

confidence: 92%

Pb–Pb zircon ages of Archaean metasediments and gneisses from the Dharwar craton, southern India: Implications for the antiquity of the eastern Dharwar craton

Bidyananda

Goswami

Srinivasan³

2011

J Earth Syst Sci

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“…This discrepancy of a younger age obtained for Holenarsipur mafic-ultramafic rocks is not immediately clear, but could probably be related to resetting of the Sm-Nd system in response to intense fluid flow associated with metamorphism. Recently Jayananda et al (2013bJayananda et al ( , 2015 have shown that fluid flow associated with 3.1 and 2.5 Ga metamorphic events caused alteration of initial Sr isotope ratios in TTGs, which is also in conformity with the Pb isotope study of Meen et al (1992). On the other hand, Jayananda et al (2008) dated Sargur Group komatiites from higher crustal levels affected by green schist metamorphism further northeast and presented a Sm-Nd whole-rock isochron age of 3352 ± 110 Ma.…”

Section: Widespread Palaeoarchaean Komatiite Volcanism and Sub-contemsupporting

confidence: 63%

“…The western Dharwar craton preserves 3.4-3.2 Ga TTG (Jayananda et al 2015) and the associated Sargur Group greenstone belts with ca. 3.38-3.15 Ga volcanic sequences and interlayered sediments (quartzite-pelite-carbonate), indicating detrital zircon ages as old as 3.6 Ga for their provenance (Meen et al 1992;Nutman et al 1992;Peucat et al 1993;Bhaskar Rao et al 2008;Jayananda et al 2008). The TTG and associated Sargur Group greenstone sequences form a basement for the younger 2.91-2.67 Ga Dharwar Supergroup greenstone sequences forming the Bababudan-Chitradurga and ShimogaDharwar basins (Kumar et al 1996;Nutman et al 1996;Trendall et al 1997;Jayananda et al 2013b;Manikyamba et al 2014aManikyamba et al , 2014b.…”

Section: Regional Geological Frameworkmentioning

confidence: 98%

“…The existence of such highly depleted deep mantle reservoirs implies differentiation of mantle in an earlier crust-forming event, possibly in the form of oceanic plateaus. Elemental and Nd-Pb isotope data of Palaeoarchaean (3.4-3.3 Ga) felsic crust (TTG-gneisses) in western Dharwar craton suggest their derivation from shallow depleted mantle, possibly in arc environments (Meen et al 1992;Peucat et al 1993;Naqvi et al 2009;Jayananda et al 2015). Consequently, elemental and isotope data of the Palaeoarchaean komatiites and TTG show depletion of both deep and shallow mantle reservoirs.…”

Section: Implications For the Archaean Mantlementioning

confidence: 99%

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Physical volcanology and geochemistry of Palaeoarchaean komatiite lava flows from the western Dharwar craton, southern India: implications for Archaean mantle evolution and crustal growth

Jayananda

Duraiswami

Aadhiseshan

et al. 2016

International Geology Review

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Palaeoarchaean (3.38-3.35 Ga) komatiites from the Jayachamaraja Pura (J.C. Pura) and Banasandra greenstone belts of the western Dharwar craton, southern India were erupted as submarine lava flows. These high-temperature (1450-1550°C), low-viscosity lavas produced thick, massive, polygonal jointed sheet flows with sporadic flow top breccias. Thick olivine cumulate zones within differentiated komatiites suggest channel/conduit facies. Compound, undifferentiated flow fields developed marginal-lobate thin flows with several spinifex-textured lobes. Individual lobes experienced two distinct vesiculation episodes and grew by inflation. Occasionally komatiite flows form pillows and quench fragmented hyaloclastites. J.C. Pura komatiite lavas represent massive coherent facies with minor channel facies, whilst the Bansandra komatiites correspond to compound flow fields interspersed with pillow facies. The komatiites are metamorphosed to greenschist facies and consist of serpentine-talc ± carbonate, actinolite-tremolite with remnants of primary olivine, chromite, and pyroxene. The majority of the studied samples are komatiites (22.46-42.41 wt.% MgO) whilst a few are komatiitic basalts (12.94-16.18 wt.% MgO) extending into basaltic (7.71 -10.80 wt.% MgO) composition. The studied komatiites are Al-depleted Barberton type whilst komatiite basalts belong to the Al-undepleted Munro type. Trace element data suggest variable fractionation of garnet, olivine, pyroxene, and chromite. Incompatible element ratios (Nb/Th, Nb/U, Zr/Y Nb/Y) show that the komatiites were derived from heterogeneous sources ranging from depleted to primitive mantle. CaO/Al 2 O 3 and (Gd/Yb) N ratios show that the Al-depleted komatiite magmas were generated at great depth (350-400 km) by 40-50% partial melting of deep mantle with or without garnet (majorite?) in residue whilst komatiite basalts and basalts were generated at shallow depth in an ascending plume. The widespread Palaeoarchaean deep depleted mantle-derived komatiite volcanism and sub-contemporaneous TTG accretion implies a major earlier episode of mantle differentiation and crustal growth during ca. 3.6-3.8 Ga.ARTICLE HISTORY

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“…The WDC comprises Paleo-to Mesoarchean (3.4-3.0 Ga) tonalitetrondhjemite-granodiorite basement referred to as the Peninsular gneisses (Beckinsale et al 1980;Taylor et al 1984;Dhoundial et al 1987;Meen et al 1992;Peucat et al 1993;Ishwar Kumar et al 2013; fig. 2).…”

Section: Regional Geology and Field Settingmentioning

confidence: 99%

The Basement of the Deccan Traps and Its Madagascar Connection: Constraints from Xenoliths

Upadhyay

Kooijman

Singh

et al. 2015

The Journal of Geology

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show abstract

Lead isotopic compositions of the Western Dharwar craton, southern India: Evidence for distinct Middle Archean terranes in a Late Archean craton

Cited by 131 publications

References 26 publications

Pb–Pb zircon ages of Archaean metasediments and gneisses from the Dharwar craton, southern India: Implications for the antiquity of the eastern Dharwar craton

Pb–Pb zircon ages of Archaean metasediments and gneisses from the Dharwar craton, southern India: Implications for the antiquity of the eastern Dharwar craton

Physical volcanology and geochemistry of Palaeoarchaean komatiite lava flows from the western Dharwar craton, southern India: implications for Archaean mantle evolution and crustal growth

The Basement of the Deccan Traps and Its Madagascar Connection: Constraints from Xenoliths

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