40Ar-39Ar age of Siberian basaltic volcanism

Venkatesan, T. R. ; Anil Kumar, ; Gopalan, K. ; Al'Mukhamedov, A. I. (1997) 40Ar-39Ar age of Siberian basaltic volcanism Chemical Geology, 138 (3-4). pp. 303-310. ISSN 0009-2541

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Official URL: http://linkinghub.elsevier.com/retrieve/pii/S00092...

Related URL: http://dx.doi.org/10.1016/S0009-2541(97)00006-5


Five of six samples representing the entire stratigraphic sequence (~3700 m thick) of basaltic flows in the Noril'sk section in the northwestern part of Siberian flood basalt province, Russia yield 40Ar-39Ar plateau ages between 248.3 ± 1.7 Ma and 246.9 ± 2.5 Ma relative to an age of 520.4 Ma for the hornblende standard, MMhb-1. These results clarify some discrepancies in existing data and confirm that eruption of the bulk of Siberian basalts was close to 248 Ma and possibly lasted less than 2 Ma. Although the violence of this volcanism may have caused the massive extinctions at the Permo-Triassic boundary, the onset of changes across this boundary seems to have been distinctly earlier.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:Siberian Volcanism; 40Ar-39Ar Geochronology; Permo-Triassic Boundary
ID Code:652
Deposited On:23 Sep 2010 08:15
Last Modified:01 Jun 2011 12:02

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