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

26Al-10Be测年在Unaweep峡谷冲积-湖泊序列中的应用：对科罗拉多高原地貌和气候演化的影响俄克拉荷马大学Gerilynn Soreghan，俄克拉荷马大学EAR-0934259摘要科罗拉多西部的Unaweep峡谷是一个地貌之谜，其年龄和起源对我们理解科罗拉多高原晚古生代和晚新生代的地貌和气候演化都有相当大的影响。这项提议寻求为测量Unaweep峡谷内和附近上更新世沉积物的核心和露头的石英中的宇宙成因放射性核素26Al和10Be提供资金。上更新世-更新世沉积是在2003-2006年新填图的，岩芯是在2004年采集的。我们的初步数据表明，Unaweep峡谷是一种古生代地貌，被晚古生代和中生代沉积物埋藏，然后在新生代重新出土，这是一个有争议的说法。尽管我们在以前的研究中做了大量的年龄测定工作，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物质。因此，这项提议的目的是应用新开发的埋葬年代测定方法。根据宇宙射线产生的放射性核素的产生和衰变来确定来自新获得的岩芯和新绘制的露头的沉积物的年龄。对目标沉积物的成功测年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表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度和性质--这是一个长期存在的问题。其次，它将有助于将一种新开发的测年方法从开发阶段转移到实际应用中。第三，钻孔穿透了大约150米的湖泊沉积物，据信是中更新世，因此有可能获得关于更新世古气候和古环境的极其宝贵的记录。这项工作还将产生重大的更广泛的影响，包括加强跨学科合作，让学生接触尖端技术，并通过出版和课堂使用来传播研究。这个项目是什么？高风险-高回报？因为它涉及应用新的专业知识，但在地貌学和古气候方面的研究进展方面提供了巨大红利的潜力。

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.