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

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• 作者：Vincent Courtillot ; Vadim A. Kravchinsky ; Xavier Quidelleur ; Paul R. Renne ; Dmitry P. Gladkochub
• 关键词：p>40p>Ar/p>39p>Ar dating ; K-Ar dating ; Frasnian-Fammenian ; Viluy Traps ; Siberia
• 刊名：Earth and Planetary Science Letters
• 出版年：2010
• 出版时间：1 December 2010
• 年：2010
• 卷：300
• 期：3-4
• 页码：239-245
• 全文大小：1819 K

文摘

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 p>40p>Ar/p>39p>Ar 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 p>40p>Ar/p>39p>Ar 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 p>40p>Ar/p>39p>Ar 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 (~ 376 ± 3 Ma). These results underscore a need for further work, in progress.