Lava-Dam Outburst Floods and Related Volcanic Features in Western Grand Canyon

西部大峡谷熔岩坝溃决洪水及相关火山特征

• 批准号: 9909580
• 负责人: Thure Cerling
• 金额: $ 16万
• 依托单位: University of Utah
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-03-15 至 2003-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9909580&HistoricalAwards=false
• 关键词: Lava; Dam; Outburst; Floods; Related

Lava-Dam Outburst Floods and Related Volcanic Features in Western Grand CanyonPIs propose to use cosmogenic 3He dating combined with hydrologic, petrographic, and geochemical techniques to resolve the history of Quaternary outburst floods in the Colorado River. This work will be supplemented by 40Ar/39Ar work on some lava flows, and by geochemical characterization of lavas. Preliminary 3He dating provides evidence for lava flows and outburst floods much younger than have been previously dated by K/Ar, significantly changing interpretations of the geomorphic evolution of western Grand Canyon. They will date basalt surfaces scoured by major flood events, outburst flood deposits, lava flows, abandoned scour channels, and perched boulder bars to constrain late Quaternary events in the western Grand Canyon. This work will allow them to correlate lava flows with lava dams and outburst flood deposits and to estimate flood magnitudes based on paleoflood evidence. This work will significantly change interpretations of the geomorphic evolution of western Grand Canyon because of the ability to accurately date events of the last 0.5 million years.

熔岩坝爆发洪水和相关的火山特征在西部大科罗拉多州PI建议使用宇宙成因3 He测年结合水文学，岩相学和地球化学技术，以解决历史的第四纪洪水爆发在科罗拉多河。 这项工作将得到一些熔岩流的40 Ar/39 Ar工作和熔岩的地球化学表征的补充。 初步的3 He测年提供的证据，熔岩流和爆发洪水比以前已经定年的K/Ar，显着改变西部大峡谷的地貌演化的解释。他们将确定玄武岩表面被主要洪水事件、爆发洪水沉积物、熔岩流、废弃的冲刷通道和栖息的巨石坝冲刷的日期，以限制西部大峡谷的第四纪晚期事件。 这项工作将使他们能够将熔岩流与熔岩坝和爆发洪水沉积物联系起来，并根据古化石证据估计洪水规模。 这项工作将大大改变对西部大峡谷地貌演变的解释，因为它有能力准确地确定过去50万年的事件。