Preliminary dating of the Viluy traps (Eastern Siberia) : eruption at the time of Late Denovian extinction events ?

V. Courtillot (1, 2) , V.A. Kravchinsky (3) , X. Quidelleur (4) , P.R Renne (5, 6) , D.P. Gladkochub (7)

1 IPGP - Institut de Physique du Globe de Paris
2 STEP - Sciences de la Terre, de l'Environnement et des Planètes
3 Department of Physics [Edmonton]
4 IDES - Interactions et dynamique des environnements de surface
5 EPS - Department of Earth and Planetary Science [UC Berkeley]
6 BGC - Berkeley Geochronology Center
7 Melnikov Permafrost Institut

In this short note, we report new age determinations from four samples of the Middle-Paleozoic Viluy Traps in Siberia, east of the more famous Permo-Triassic Siberian Traps. These samples, which were collected from three drill cores, have been analyzed in parallel and independently in the Orsay (France) and Berkeley Geochronology Center (BGC; USA) geochronology laboratories, using respectively the Cassignol-Gillot K-Ar and the Ar-40/Ar-39 techniques. Dating these samples as a concerted effort in two independent laboratories working jointly on their interpretation is a rather rare yet very valuable exercise. With the K-Ar technique, ages ranging from 338 to 367 Ma with uncertainties on the order of 5 Ma were obtained. With the Ar-40/Ar-39 technique, integrated ages range from 344 to 367 Ma, with uncertainties on the order of 1 Ma, and two samples yielded plateaus, i.e. the best determined ages, at 360.3 +/- 0.9 and 370.0 +/- 0.7 Ma. Three out of four ages yielded by the two separate methods are in agreement within uncertainties. One sample yields incompatible ages and could be from a later, altered dyke event. The Ar-40/Ar-39 plateau age of 370.0 0.7 Ma (conventional calibration) or 373.4 +/- 0.7 Ma (recalculated per Renne et al., 2010), the most reliable age obtained in this study, is compatible with recent determinations of the Late Devonian extinction events at the end-Frasnian (similar to 376 +/- 3 Ma). These results underscore a need for further work, in progress. (C) 2010 Elsevier B.V. All rights reserved.

Domaines: Sciences de la Terre

V. Courtillot, V.A. Kravchinsky, X. Quidelleur, P.R Renne, D.P. Gladkochub. Preliminary dating of the Viluy traps (Eastern Siberia) : eruption at the time of Late Denovian extinction events ?. Earth and Planetary Science Letters, 2010, 300, pp.:239-245 (IF 4.062). ⟨hal-00545487⟩