Current Science

T. Lala ¹, L. S. Mombasawala ², K. Pande ², D. K. Paul ¹

Affiliations
1 Department of Geology, Presidency University, Kolkata 700 073, IN
2 Department of Earth Sciences, Indian Institute of Technology Bombay, Mumbai 400 076, IN

Abstract

Mafic dykes constitute an important component of the Deccan Volcanic Province. The duration of Deccan volcanism was from 69 to 63 Ma with a peak at 65 ± 1 Ma. The thickness of the lava flows is much reduced and intensity of dyke occurrence is much less in the eastern part of the province compared to the western part. Here we report new ³⁹Ar-⁴⁰Ar plateau ages of 60.1 ± 0.3 Ma (2σ) and 82.3 ± 0.7 Ma (2σ) of two mafic dykes from Shahdol (Madhya Pradesh) and Chirimiri (Chhattisgarh), which indicate polyphase dyke intrusion in the eastern Deccan Volcanic Province.

Keywords

Argon Dating, Lava Flows, Mafic Dykes, Volcanic Burst.

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