CAREER: Using Caves in Tectonic and Climatic Geomorphology

职业：利用洞穴研究构造和气候地貌EAR-0092459 Darryl E.Granger洞穴在地下流动时形成，溶解了洞穴形成时标志着地下水位高度的管道和峡谷。因此，残馀洞穴通道及其沉积可以用来解释区域地下水位下降的历史，这种下降往往受河流切割或构造抬升的影响。洞穴中的保护性环境可以将脆弱的沉积物和矿物保存数百万年，在此期间，地表可能被侵蚀雕刻，构造力可能会抬升洞穴所在的整个山脉。Pi建议在三个不同的项目中使用洞穴和洞穴沉积物，每个项目都对区域气候和构造地貌有重要影响。宇宙成因的26Al和10Be将被用于测定田纳西州和肯塔基州坎伯兰陡坡沿线一系列大型洞穴的沉积物的年代，这些洞穴似乎记录了与俄亥俄河流域冰川作用有关的区域性河流切割的脉冲。Pi将对加利福尼亚州内华达山脉上标志着古老水池的洞穴矿藏进行勘测和年代测定，以限制这一山脉的构造倾斜。保存在新西兰高山洞穴中的海滩沉积物将被测得年代，以确定这一构造活跃地区的抬升速率。此外，PI将利用这项工作，通过向国家公园管理局提供讲习班、教师培训和教育文献，教育学生和公众了解洞穴及其独特的水文学。

CAREER: Using Caves in Tectonic and Climatic GeomorphologyEAR-0092459Darryl E. GrangerCaves form as water flows underground, dissolving tubes and canyons that mark the water-table elevation at the time of cave development. Relict cave passages and their sediments can thus be used to decipher the history of regional water-table lowering, which is often regulated by river incision or tectonic uplift. The protective environment in a cave can preserve fragile sediments and minerals for millions of years, during which time the surface may be sculpted by erosion and tectonic forces may uplift entire mountain ranges in which the caves lie. PI proposes to use caves and cave sediments in three distinct projects, each with important implications for regional climatic and tectonic geomorphology. Cosmogenic 26Al and 10Be will be used to date sediments in a suite of large caves along the Cumberland Escarpment of Tennessee and Kentucky, which appear to record a pulse of regional river incision related to glaciation in the Ohio River basin. PI will survey and date cave mineral deposits that mark ancient pools in the Sierra Nevada, California, to constrain tectonic tilting of this mountain range. Beach-deposited sediments preserved in caves that are now high in the mountains of New Zealand will be dated to determine uplift rates in this tectonically active region. In addition, PI will use this work to educate students and the public about caves and their unique hydrology through workshops, teacher training and educational literature provided to the National Park Service.