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

二叠纪-三叠纪洪水玄武岩火山活动的时间和持续时间：西伯利亚圈闭和兰盖利亚

• 批准号: 9118076
• 负责人: Robert Duncan
• 金额: $ 7.17万
• 依托单位: Oregon State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-04-01 至 1995-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9118076&HistoricalAwards=false
• 关键词: Timing; Duration; Permo; Triassic; Flood

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.

这项研究的目的是确定时间和持续时间 西伯利亚圈闭中的泛滥玄武岩火山活动。 次苦橄岩 玄武岩流和火山碎屑岩大约在 二叠纪和三叠纪的分界线。 玄武质 用40 Ar-39 Ar可以精确地测定岩石的年代。 俄罗斯同事提供了40个玄武岩样品。 样本来自广泛的地理区域和钻芯 穿透了熔岩序列最厚的部分一些 还将分析Wrangellia Wangellia的三叠纪岩石。 放射性测年法将确定 火山作用，并有可能阐明 二叠纪-三叠纪灭绝