Collaborative Research: Nuclear Studies of Continental Erosion Processes and Rates

合作研究：大陆侵蚀过程和速率的核研究

• 批准号: 8904676
• 负责人: Roy Middleton
• 金额: --
• 依托单位: University of Pennsylvania
• 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: 1989-07-01 至 1991-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8904676&HistoricalAwards=false
• 关键词: Collaborative; Research; Nuclear; Studies; Continental

The object of a previous collaborative grant with Scripps Institution was to determine the production rates of 10Be and 26Al made by cosmic-ray interactions with quartz. We now plan to make use of this in situ production of cosmogenic radionuclides to study rates of erosion, extents of glaciation, rates of uplift, and in general, to determine histories of surface morphology. In addition to continuing measurements of 10Be and 26Al produced in quartz, we plan to study the 14C produced in the same samples-thus providing better control over the most recent exposure history (last -20 ka). We also plan to test the feasibility of measuring 41Ca in feldspars and soil samples. 41Ca's lifetime of -100 ka makes it appear ideal for studying surface development subsequent to the most recent period of glaciation, but complications arising from the fact that it is made from neutron capture, may make it too sensitive to water content and matrix effects to be useful as a chronometer. Finally, we would like to further improve our measurements capabilities for 26Al and 10Be, specifically by improving precision and by introducing automation into our measurement procedures.

之前与斯克里普斯研究所合作资助的目的是确定宇宙射线与石英相互作用产生 10Be 和 26Al 的生产率。 我们现在计划利用宇宙放射性核素的原位产生来研究侵蚀率、冰川作用范围、隆起率，并总体上确定表面形态的历史。 除了继续测量石英中产生的 10Be 和 26Al 之外，我们还计划研究相同样品中产生的 14C，从而更好地控制最近的暴露历史（最后 -20 ka）。 我们还计划测试测量长石和土壤样品中 41Ca 的可行性。 41Ca 的 -100 ka 寿命使其看起来非常适合研究最近一段冰川作用后的地表发育，但由于它是由中子捕获形成的，因此产生的复杂性可能使其对含水量和基质效应过于敏感而无法进行研究。可用作天文钟。 最后，我们希望进一步提高 26Al 和 10Be 的测量能力，特别是通过提高精度和在测量程序中引入自动化。