Mafic and ultramafic magmatism and associated mineralization in the Dharwar craton, southern India

Devaraju, T. C.; Viljoen, R. P.; Sawkar, R. H.; Sudhakara, T. L.

doi:10.1007/s12594-009-0005-0

Cited by 36 publications

(8 citation statements)

References 25 publications

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“…New discoveries of kimberlites occupying an extensive area of ~400 km 2 are also reported from the Maddur-Mahboobnagar sector of the Eastern Dharwar craton. These intrusives are centered around the villages of Maddur (10 pipes), Kotakonda (7 pipes), Vanjamur and Narayanpet (6 pipes) (Devaraju et al, 2009). Likewise, three pipes are also reported from a few areas around Gurumatkal, and four in the neighborhood of Bewanahalli villages within the Gulbarga district of Karnataka in the Eastern Dharwar craton.…”

Section: Diamond Prospecting In Southeast India-a Historical To Currementioning

confidence: 98%

Imaging mantle lithosphere for diamond prospecting in southeast India

Sharma¹,

Ramesh²

2013

Lithosphere

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An understanding of the tectonic makeup of an area through study of surface geological features, together with depth information on the nature of the underlying lithosphere, forms the key to diamond exploration strategy. Although diamonds have been reported from the Indian craton for many centuries, the search for their carrier rocks dates back only to the beginning of the twentieth century. This study focuses on a wide area in southeast India, parts of which are sources of both diamondiferous and nondiamondiferous kimberlites and lamproites. Using Ps (SV and SH) and Sp receiver functions, we recovered depth images of the lithospheric mantle beneath southeast India encompassing the Eastern Dharwar-Bastar cratons and the adjoining Eastern Ghats mobile belt. These images reveal the presence of two signifi cant velocity anomalies of contrasting nature at different depths beneath the study region. High-velocity features are observed between 160 and 220 km depth (Lehmann discontinuity depth, or L-depth), and a complex low-velocity contrast layer is delineated at ~80-100 km depth. Analyses of results from several other studies that include regional geology, geophysics, geochemistry, and geochronology allow us to infer that the positive velocity contrasts at L-depth represent preserved oceanic remnants of a ca. 1.6 Ga paleosubduction event in southeast India. Analysis of selected geothermobarometry data in conjunction with other evidence presented in this study indicates that the craton beneath southeast India is underlain by a thick lithospheric root/keel in excess of 200 km, suggesting an environment conducive to diamond stability. Consequently, we interpret the complex low-velocity contrast layer feature as a midlithospheric discontinuity and not a shallow lithosphere-asthenosphere boundary. The diamond formation potential of the area is discussed in light of a working model that incorporates the Mesoproterozoic paleosubduction scenario (ca. 1.6 Ma event) and subsequent kimberlite and/or lamproite intrusions. Wide regions covering the Godavari graben and adjoining areas are identifi ed as potential zones for diamond exploration. on June 7, 2015 lithosphere.gsapubs.org Downloaded from DAS SHARMA AND RAMESH 332 www.gsapubs.org | Volume 5 | Number 4 | LITHOSPHEREnamely, the Bastar and the Eastern Dharwar cratons, using Ps (P-to-s conversions) and Sp (S-to-p conversions) receiver functions (Vinnik, 1977;Farra and Vinnik, 2000). Based on these seismological results and available geological, geochemical, geochronological, and thermobarometric data, we present a comprehensive geodynamic model to illustrate diamond genesis in the cratonic blocks of southeast India. We also use these results to delineate prospective diamondiferous zones in the study. Our results show that the present-day lithosphere beneath southeast India is indeed thick and extends beyond the well-defi ned diamond stability fi eld.

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Section: Diamond Prospecting In Southeast India-a Historical To Currementioning

confidence: 98%

Imaging mantle lithosphere for diamond prospecting in southeast India

Sharma¹,

Ramesh²

2013

Lithosphere

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“…Metamorphic grade in the Sargur is amphibolite facies grading into granulite facies (Swami Nath and Ramakrishnan, 1981). Chromite, barite, magnesite, titaniferous magnetite, nickel, platinum and copper mineralization occur in the Sargur Group (Radhakrishna and Vaidyanathan, 1997;Devaraju et al, 2009). The Bababudan Group comprises mafic-ultramafic volcanics, arenites, phyllites, polymict and oligomictic conglomerates and banded iron formations (Swami Nath and Ramakrishnan, 1981;Naqvi and Rogers, 1987).…”

Section: Regional Geologymentioning

confidence: 99%

Archean turbidite hosted orogenic gold mineralization in the Gadag greenstone belt, Western Dharwar Craton, Peninsular India

Ugarkar

Malapur

Kumar

2016

Ore Geology Reviews

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“…from 3500 Ma to 2700 Ma), indicating major high-Mg ultramafic-mafic magmatism concentrated in the Archean (e.g., DeWit and Ashwal, 1995;Grove and Parman, 2004); this high-Mg ultramafic-mafic magmatic period spanned almost 800 Ma and may be the cause for the depleted nature Older Greenstone sequence with TTG TTG (Peninsular Gneiss) 3.4-2.9 Ga b Sargur Group metavolcanics and metasediments including sill-like layered ultramafic-mafic plutonic suite containing chromite and magnetite deposits 3.4-3.0 Ga a (3125±120 Ma age for the sill like plutonic suite; this study) a Jayananda et al (2008), Maya et al (2011). b Jayananda and Peucat (1996); c Devaraju et al (2009) and references therein. d Bhaskar Rao et al (1992), Drury et al (1983).…”

Section: High-mg Ultramafic-mafic Magmatism In the Archean And Supercmentioning

confidence: 99%

The 3.1 Ga Nuggihalli chromite deposits, Western Dharwar craton (India): Geochemical and isotopic constraints on mantle sources, crustal evolution and implications for supercontinent formation and ore mineralization

Mukherjee

Mondal

Frei

et al. 2012

Lithos

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Mafic and ultramafic magmatism and associated mineralization in the Dharwar craton, southern India

Cited by 36 publications

References 25 publications

Imaging mantle lithosphere for diamond prospecting in southeast India

Imaging mantle lithosphere for diamond prospecting in southeast India

Archean turbidite hosted orogenic gold mineralization in the Gadag greenstone belt, Western Dharwar Craton, Peninsular India

The 3.1 Ga Nuggihalli chromite deposits, Western Dharwar craton (India): Geochemical and isotopic constraints on mantle sources, crustal evolution and implications for supercontinent formation and ore mineralization

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