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

摘要科罗拉多西部的unawweep Canyon是一个地貌之谜，其年龄和起源对我们了解晚古生代和晚新生代大科罗拉多高原的地貌和气候演化具有重要意义。本提案寻求资金用于测量unawop峡谷及其附近上新世-更新世沉积物岩心和露头石英中的宇宙成因放射性核素26Al和10Be。2003-2006年对上新世—更新世沉积物进行了新测绘，2004年采集了岩心。我们的初步资料表明，unawweep Canyon是一个被晚古生代和中生代沉积物掩埋的古生代地貌，然后在新生代被重新发掘，这是一个有争议的说法。尽管我们在之前的研究中做了大量的年代测定工作，但我们在这个沉积序列中没有发现可以用传统方法测定年代的材料。因此，本提案的目的是应用新开发的方法？埋葬约会?根据宇宙射线产生的放射性核素的产生和衰变，从新获得的岩心和新绘制的露头确定沉积物的年龄。成功确定目标沉积物的年代将带来三个切实的好处。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发展阶段推向实际应用。第三，钻孔穿透约150米的湖泊沉积物，被认为是更新世中期的，因此有可能获得更新世古气候和古环境的极有价值的记录。这项工作还将产生重大的广泛影响，包括加强跨学科合作，让学生接触尖端技术，并通过出版物和课堂使用传播研究成果。这个项目是什么？高风险-高回报？因为它涉及到新的专业知识的应用，但在地貌学和古气候的研究进展方面提供了巨大的红利潜力。

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.