EAGER: Application of 26Al-10Be Dating to Alluvial-Lacustrine Successions of Unaweep Canyon: Implications for Geomorphic and Climatic Evolution in the Colorado Plateau

EAGER：26Al-10Be 测年在 Unaweep 峡谷冲积湖相序列中的应用：对科罗拉多高原地貌和气候演化的影响

• 批准号: 0934259
• 负责人: Gerilyn Soreghan
• 金额: $ 4.23万
• 依托单位: University of Oklahoma Norman Campus
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-06-01 至 2011-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0934259&HistoricalAwards=false
• 关键词: EAGER; Application; 26Al; 10Be; Dating

EAGER: Application of 26Al-10Be Dating to Alluvial-Lacustrine Successions of Unaweep Canyon: Implications for Geomorphic and Climatic Evolution in the Colorado PlateauGerilynn Soreghan, University of OklahomaEAR-0934259AbstractUnaweep Canyon of western Colorado is a geomorphic enigma whose age and origin has considerable bearing on our understanding of landform and climate evolution of the greater Colorado Plateau for both the late Paleozoic and late Cenozoic. This proposal seeks funding for measurement of the cosmogenic radionuclides 26Al and 10Be in quartz from core and outcrop of Plio-Pleistocene sediment within and near Unaweep Canyon. The Plio-Pleistocene sediments were newly mapped in 2003-2006, and the core was collected in 2004. Our preliminary data indicate that Unaweep Canyon is a Paleozoic landform buried by later Paleozoic and Mesozoic sediments and then re-exhumed during the Cenozoic, a controversial claim. Despite considerable age-dating efforts in our previous research, we have found no material in this sedimentary succession that can be dated using conventional methods. Thus, the purpose of this proposal is to apply newly developed methods of ?burial dating? based on the production and decay of cosmic-ray-produced radionuclides to determine the age of the sediments from the newly acquired core and the newly mapped outcrops. Successful dating of the target sediments will yield three tangible benefits. First, it will solve a significant regional geologic problem by establishing the timeline of geomorphic events and will yield insight into the rate and nature of Cenozoic fluvial incision of the Colorado Plateau?a long-standing problem. Second, it will help to move a newly developed dating method from the developmental stage into practical applications. Third, the borehole penetrates ~ 150 meters of lacustrine sediments believed to be of middle Pleistocene age, thus offering the potential to access an extremely valuable record of Pleistocene paleoclimate and paleoenvironment. This work will also result in significant broader impacts, including strengthening interdisciplinary collaborations, exposing students to cutting-edge techniques, and disseminating the research via publication and classroom use. This project is ?high risk-high payoff? because it involves application of new expertise, but offers potential for great dividends in terms of research advances in geomorphology and paleoclimate.

EAGER：~（26）Al-10 Be定年法在乌纳韦峡谷冲湖序列研究中的应用科罗拉多高原地貌和气候演变的意义俄克拉荷马大学-科罗拉多西部的Unaweep峡谷是一个地貌之谜，它的年龄和成因对我们理解大科罗拉多高原晚古生代和晚古生代的地貌和气候演变有相当大的影响。新生代。该提案寻求资金，用于测量Unaweep峡谷内和附近上新世-更新世沉积物岩芯和露头中石英中的宇宙成因放射性核素26 Al和10 Be。2003-2006年新绘制了上新世-更新世沉积物图，2004年采集了岩芯。我们的初步数据表明，Unaweep峡谷是一个古生代地貌，被晚古生代和中生代沉积物掩埋，然后在新生代重新出土，这是一个有争议的说法。尽管在我们以前的研究中做了相当大的年龄测定工作，但我们在这个沉积序列中没有发现可以用常规方法测定年龄的材料。因此，这项建议的目的是应用新开发的方法？埋葬年代根据宇宙射线产生的放射性核素的产生和衰变，确定新获得的岩芯和新绘制的露头的沉积物年龄。成功测定目标沉积物的年代将产生三个切实的好处。首先，它将通过建立地貌事件的时间轴来解决一个重要的区域地质问题，并将深入了解科罗拉多高原新生代河流切割的速率和性质。一个长期存在的问题第二，它将有助于将一种新开发的测年方法从开发阶段推向实际应用。第三，钻孔穿透约150米的湖泊沉积物，据信是中更新世的年龄，从而提供了一个非常有价值的记录更新世古气候和古环境的潜力。这项工作还将产生更广泛的影响，包括加强跨学科合作、让学生接触尖端技术以及通过出版物和课堂使用传播研究成果。这个项目是？高风险高回报因为它涉及新的专业知识的应用，但在地貌学和古气候研究进展方面提供了巨大的红利潜力。