Caves As Recorders of River Incision, Tectonics, and Landscape Evolution In the Sierra Nevada California

洞穴是加利福尼亚州内华达山脉河流切切、构造和景观演化的记录者

• 批准号: 0514526
• 负责人: Robert Anderson
• 金额: $ 18.33万
• 依托单位: University of Colorado at Boulder
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-01-01 至 2005-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0514526&HistoricalAwards=false
• 关键词: Caves; Recorders; River; Incision; Tectonics

Considerable interest and debate surround the problem of uplift and geomorphic evolution of areas undergoing arc magmatism and arc accretion to continental margins. The Sierra Nevada of California, a deeply eroded remnant of a late Mesozoic magmatic arc, has conventionally been thought to have been uplifted in late Cenozoic time, however this conclusion has been challenged by low temperature geochronologic studies suggesting high relief as early as late Mesozoic. This project will measure river incision rates in the Sierra Nevada by comparing elevations of dated cave deposits with present day river elevations. These data will be incorporated in a model of Sierra landscape evolution in order to provide a test of the competing mutually exclusive hypotheses. Results will be of considerable regional importance and have clear implications on broader issues.

围绕经历弧岩浆作用和弧增生到大陆边缘的地区的隆起和地貌演化问题引起了相当大的兴趣和争论。加利福尼亚州的内华达山脉是晚中生代岩浆弧被深度侵蚀的残余物，传统上被认为在新生代晚期隆起，然而这一结论受到了低温地质年代学研究的挑战，低温地质年代学研究表明早在中生代晚期就有高地势。该项目将通过比较古老洞穴沉积物的海拔与当今河流的海拔来测量内华达山脉的河流切割率。这些数据将被纳入山脉景观演化模型中，以便对相互竞争的相互排斥的假设进行检验。结果将具有相当大的区域重要性，并对更广泛的问题产生明确的影响。