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Mesoproterozoic diamondiferous ultramafic pipes at Majhgawan and Hinota, Panna area, central India : Key to the nature of sub-continental lithospheric mantle beneath the Vindhyan basin
CHALAPATHI RAO N. V. ; RAY Jyotiranjan (Editeur scientifique) ; CHAKRABORTY Chandan (Editeur scientifique)
Amongst all the perceptible igneous manifestations (volcanic tuffs and agglomerates, minor rhyolitic flows and andesites, dolerite dykes and sills near the basin margins, etc.) in the Vindhyan basin, the two Mesoproterozoic diamondiferous ultramafic pipes intruding the Kaimur Group of sediments at Majhgawan and Hinota in the Panna area are not only the most conspicuous but also well-known and have relatively deeper mantle origin. Hence, these pipes constitute the only yet available 'direct' mantle samples from this region and their petrology, geochemistry and isotope systematics are of profound significance in understanding the nature of the sub-continental lithospheric mantle beneath the Vindhyan basin. Their emplacement age (∼1100 Ma) also constitutes the only reliable minimum age constrain on the Lower Vindhyan Group of rocks. The Majhgawan and Hinota pipes share the petrological, geochemical and isotope characteristics of kimberlite, orangeite (Group II kimberlite) and lamproite and hence are recognised as belonging to a 'transitional kimberlite-orangeite-lamproite' rock type. The name majhagwanite has been proposed by this author to distinguish them from other primary diamond source rocks. The parent magma of the Majhgawan and Hinota pipes is envisaged to have been derived by very small (<1%) degrees of partial melting of a phlogopite-garnet lherzolite source (rich in titanium and barium) that has been previously subjected to an episode of initial- depletion (extensive
Journal of earth system science A. 2006, vol. 115, n° 1, pp. 161-183 [23 pages] [bibl. : 3 p.3/4]
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