Resumé
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.
Originalsprog | Engelsk |
---|---|
Sider (fra-til) | 142-149 |
Antal sider | 8 |
Tidsskrift | Earth and Planetary Science Letters |
Vol/bind | 290 |
Udgave nummer | 1-2 |
DOI | |
Status | Udgivet - 15 feb. 2010 |
Programområde
- Programområde 4: Mineralske råstoffer