Collaborative Research on Surface-Exposure Dating of a Quaternary Glacial Sequence for the White Mountains, CA-NV

白山第四纪冰川序列地表暴露测年合作研究，CA-NV

• 批准号: 8901437
• 负责人: Fred Phillips
• 金额: $ 5万
• 依托单位: New Mexico Institute of Mining and Technology
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1989
• 资助国家: 美国
• 起止时间: 1989-05-15 至 1992-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8901437&HistoricalAwards=false
• 关键词: Collaborative; Research; Surface; Exposure; Dating

Few long-term glacial records exist, and the ones that do are geographically scattered. The White Mountains, immediately east of the central Sierra Nevada in California and Nevada have one of the most complete sequences of deposits from glacial events in North America. New pre- and post-applications of new surface exposure dating methods make it possible to determine ages of geomorphic surfaces through analyses of multiple cosmogenic isotopes that accumulate in surface boulders. The goal of this collaborative project is to develop a numerical glacial chronology for the White Mountains using these surface-exposure dating methods in conjunction with dates based on associated volcanics, rock varnish, soils, and weathering. The investigators will use the same approach in the Sierra Nevada in order to an accurately compare the two records and to discriminate the effects of synoptic climatology versus tectonic history as controls on the glaciation of the mountain ranges. The research is anticipated to provide one of the most complete continental records of glacial events in North America. The results obtained also will provide a chronology for comparing a continental glacial record with other long-term records of continental and environmental change and with the well-established marine record. The study will use multiple and varied dating techniques, some of which are in the intial stages of development, to help unravel the glacial chronology of the White Mountains. This interdisciplinary research effort will help assess the viability of new dating approaches and various traditional glacial, soils, and geomorphological techniques used by physical geographers and other earth scientists. The research will contribute to our understanding of how the well-preserved glacial sequence in the White Mountains relates to changes in climate, tectonic activity, and vegetation. The study will correlate the White Mountain glacial sequence to other regional continental geomorphic investigations and to the lengthy glacio-marine record, and it will provide insight into the scale and timing of large changes in the hydrologic balance of the Western United States.

很少有长期的冰川记录存在，而存在的是 地理上分散。 白色山脉，就在 加州州和内华达州的内华达山脉中部 最完整的沉积序列来自北方的冰川事件 美国参考 新的表面暴露年代测定的新的前后应用 方法使确定地貌表面的年龄成为可能 通过分析多种宇宙成因的同位素， 表面巨石 该合作项目的目标是开发 一个白色山脉的冰川年代学 表面暴露测年法结合基于 相关的火山岩、岩石清漆、土壤和风化作用。 的 调查人员将在内华达州山脉使用同样的方法， 为了准确地比较两个记录并区分 天气气候学对构造历史的影响， 山脉的冰川作用 这项研究预计将 提供了最完整的大陆冰川事件记录之一 在北美 获得的结果还将提供一个年表 将大陆冰川记录与其他长期记录进行比较 大陆和环境变化的影响，并与公认的 海军陆战队记录 这项研究将使用多种多样的测年技术，其中一些技术 正处于发展的初始阶段，以帮助解开冰川 白色山脉的年表 这种跨学科的研究 这项工作将有助于评估新的测年方法的可行性， 各种传统的冰川、土壤和地貌技术 被自然地理学家和其他地球科学家使用。 研究 将有助于我们理解保存完好的冰川 白色山脉的层序与气候、构造 活动和植被。 这项研究将把白色山 冰川序列与其他区域性大陆地貌 调查和漫长的冰川海洋记录，它将 提供洞察的规模和时间的大变化， 美国西部的水文平衡。