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

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Title Rapid emplacement of the Kerguelen plume-related Sylhet Traps, eastern India: Evidence from Ar-40-Ar-39 geochronology
 
Creator RAY, JS
PATTANAYAK, SK
PANDE, K
 
Subject rajmahal traps
igneous rocks
flood basalts
hotspot
ridge
province
plateau
margins
 
Description We report for the first time Ar-40-Ar-39 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.
 
Publisher AMER GEOPHYSICAL UNION
 
Date 2011-07-15T07:08:00Z
2011-12-26T12:49:19Z
2011-12-27T05:35:10Z
2011-07-15T07:08:00Z
2011-12-26T12:49:19Z
2011-12-27T05:35:10Z
2005
 
Type Article
 
Identifier GEOPHYSICAL RESEARCH LETTERS, 32(10), -
0094-8276
http://dx.doi.org/10.1029/2005GL022586
http://dspace.library.iitb.ac.in/xmlui/handle/10054/4183
http://hdl.handle.net/10054/4183
 
Language en