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

Publication ,  Journal Article
Ray, JS; Pattanayak, SK; Pande, K
Published in: Geophysical Research Letters
May 28, 2005

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.

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Published In

Geophysical Research Letters

DOI

ISSN

0094-8276

Publication Date

May 28, 2005

Volume

32

Issue

10

Start / End Page

1 / 4

Related Subject Headings

  • Meteorology & Atmospheric Sciences
 

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Ray, J. S., Pattanayak, S. K., & Pande, K. (2005). Rapid emplacement of the Kerguelen plume-related Sylhet Traps, eastern India: Evidence from 40Ar-39Ar geochronology. Geophysical Research Letters, 32(10), 1–4. https://doi.org/10.1029/2005GL022586
Ray, J. S., S. K. Pattanayak, and K. Pande. “Rapid emplacement of the Kerguelen plume-related Sylhet Traps, eastern India: Evidence from 40Ar-39Ar geochronology.” Geophysical Research Letters 32, no. 10 (May 28, 2005): 1–4. https://doi.org/10.1029/2005GL022586.
Ray JS, Pattanayak SK, Pande K. Rapid emplacement of the Kerguelen plume-related Sylhet Traps, eastern India: Evidence from 40Ar-39Ar geochronology. Geophysical Research Letters. 2005 May 28;32(10):1–4.
Ray, J. S., et al. “Rapid emplacement of the Kerguelen plume-related Sylhet Traps, eastern India: Evidence from 40Ar-39Ar geochronology.” Geophysical Research Letters, vol. 32, no. 10, May 2005, pp. 1–4. Scopus, doi:10.1029/2005GL022586.
Ray JS, Pattanayak SK, Pande K. Rapid emplacement of the Kerguelen plume-related Sylhet Traps, eastern India: Evidence from 40Ar-39Ar geochronology. Geophysical Research Letters. 2005 May 28;32(10):1–4.
Journal cover image

Published In

Geophysical Research Letters

DOI

ISSN

0094-8276

Publication Date

May 28, 2005

Volume

32

Issue

10

Start / End Page

1 / 4

Related Subject Headings

  • Meteorology & Atmospheric Sciences