Diamondiferous kimberlites in central India synchronous with Deccan flood basalts

Bernd Lehmann, Ray Burgess, Dirk Frei, Boris Belyatsky, Datta Mainkar, Nittala V. Chalapathi Rao, Larry M. Heaman

Publikation: Bidrag til tidsskriftArtikelForskningpeer review

77 Citationer (Scopus)

Abstrakt

Recently discovered diamondiferous kimberlite (Group-II) pipes in central India have surprisingly young 40Ar/39Ar whole rock and U–Pb perovskite ages around 65 million years. These ages overlap with the main phase of the Deccan flood basalt magmatism, and suggest a common tectonomagmatic control for both flood basalts and kimberlites. The occurrence of macrodiamonds in the pipes implies the presence of a thick subcratonic lithosphere at the Cretaceous/Tertiary boundary, significantly different from the present-day thickness of the Indian lithosphere. About one third of the Indian lithosphere was lost during or after the Deccan flood basalt event. The superfast northward motion of the Indian plate prior to the collision with Eurasia cannot be related to lithospheric thinning during the Gondwana break-up at 130 Ma, as previously thought.
OriginalsprogEngelsk
Sider (fra-til)142-149
Antal sider8
TidsskriftEarth and Planetary Science Letters
Vol/bind290
Udgave nummer1-2
DOI
StatusUdgivet - 15 feb. 2010

Programområde

  • Programområde 4: Mineralske råstoffer

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