Rapid emplacement of the Kerguelen plume-related Sylhet Traps, eastern India: Evidence from 40 Ar-39 Ar geochronology

Published

Journal Article

We report for the first time 40Ar-39Ar plateau ages for the Sylhet Traps of eastern India. Our results provide concordant ages for two samples, vertically separated by ∼200 m, from a tholeiite lava flow sequence. The ages are indistinguishable at 2σ confidence level indicating a rapid emplacement of these lavas. The weighted mean of the plateau ages associated with least errors, 116.0 ± 3.5 Ma, most likely represents the age of eruption. Clearly, the Sylhet Traps are contemporaneous with the Kerguelen plume generated Rajmahal and Bengal Traps. Our results in conjunction with the existing age data in the Rajmahal-Bengal-Sylhet igneous province suggest that the latter experienced widespread, and rapid emplacement of flood basalts at ∼118 ± 2 Ma. Such a large-scale volcanism would have required a direct involvement of the Kerguelen plume, suggesting that the Kerguelen hotspot was located close to the eastern Indian margin during its initiation. Copyright 2005 by the American Geophysical Union.

Full Text

Duke Authors

Cited Authors

  • Ray, JS; Pattanayak, SK; Pande, K

Published Date

  • May 28, 2005

Published In

Volume / Issue

  • 32 / 10

Start / End Page

  • 1 - 4

International Standard Serial Number (ISSN)

  • 0094-8276

Digital Object Identifier (DOI)

  • 10.1029/2005GL022586

Citation Source

  • Scopus