The Timing and Duration of Permo-Triassic Flood Basalt Volcanism: Siberian Traps and Wrangellia

本研究的目的是确定西伯利亚圈闭洪水玄武岩火山作用的时间和持续时间。陆生苦荞岩、玄武岩流和火山碎屑岩大约在二叠纪和三叠纪交界时期喷发。玄武岩将使用40Ar-39Ar精确测定年代。俄罗斯同事提供了40个玄武岩样品。样品来自广泛的地理区域，来自钻穿熔岩层序最厚部分的岩心。还将分析弗兰格里亚地体的一些三叠纪岩石。放射性定年法将确定火山活动的年龄和持续时间，并有可能揭示二叠纪-三叠纪灭绝的原因。

The purpose of this research is to determine the time and duration of flood basalt volcanism in the Siberian Traps. Subaerial picrite and basalt flows and pyroclastic rocks erupted about the time of the boundary between the Permian and Triassic periods. Basaltic rocks will be dated precisely and accurately using the 40Ar-39Ar. Forty basaltic samples have been supplied by Russian colleagues. Samples come from a wide geographic area and from drill cores penetrating the thickest section of the lava sequence. Some Triassic rocks from Wrangellia terrane will also be analyzed. Radiometric dating will establish the age and duration of the volcanism, and has the potential of sheding light on the causes of the Permo-Triassic extinction.