EAR-PF: Using noble gas techniques to benchmark feldspar thermoluminescence (TL) thermochronology

EAR-PF：使用惰性气体技术对长石热释光 (TL) 热年代学进行基准测试

• 批准号: 1806629
• 负责人: Nathan Brown
• 金额: $ 17.4万
• 依托单位: Brown Nathan D
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2019
• 资助国家: 美国
• 起止时间: 2019-03-01 至 2023-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1806629&HistoricalAwards=false
• 关键词: EAR; PF; Using; noble; gas

Dr. Nathan Brown has been granted a postdoctoral fellowship to carry out research and an education plan with at the Berkeley Geochronology Center. The main goal of this project is to develop feldspar thermoluminescence (TL) for use as an ultra-low-temperature thermochronometer. Once validated, this technique will allow geologists to: infer recent temperature perturbations caused by geomorphic agents acting within the upper kilometer or two of Earth's surface; resolve local Holocene uplift rates and better evaluate seismic risk in tectonically active regions; and survey sites for their potential geothermal energy resources. Dr. Brown will also interact with and train undergraduate and graduate students in the sample preparation and data analysis techniques necessary to implement this novel technique.The spatial and temporal scales over which rivers and glaciers erode bedrock are largely inaccessible to thermochronologists. Feldspar TL thermochronology, however, shows sensitivity to near-surface and atmospheric temperatures and can be used to constrain continuous thermal histories at timescales ranging from about 100 to 1,000,000 years. This study will calibrate feldspar TL results against results obtained with the more established techniques of paleothermometry from cosmogenic 3He in quartz and apatite 4He/3He thermochronology. Bedrock samples that will be analyzed come from the Yucaipa Ridge tectonic block, adjacent to the San Andreas fault; the Klinaklini glacial valley in British Columbia; and the Pensacola Mountains of Antarctica.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

内森·布朗博士已获得博士后奖学金，在伯克利地质年代学中心开展研究和教育计划。该项目的主要目标是开发长石热释光（TL）作为超低温测温计。一旦经过验证，该技术将允许地质学家： 推断由地貌因素在地球表面上一公里或两公里内作用引起的近期温度扰动；解决局部全新世抬升率问题，更好地评估构造活动区域的地震风险；以及潜在地热能源的调查地点。布朗博士还将与本科生和研究生进行互动，并培训他们实施这项新技术所需的样品制备和数据分析技术。河流和冰川侵蚀基岩的空间和时间尺度在很大程度上是热年代学家无法了解的。然而，长石 TL 热年代学显示出对近地表和大气温度的敏感性，可用于限制约 100 至 1,000,000 年时间尺度的连续热历史。这项研究将根据石英中宇宙成因 3He 和磷灰石 4He/3He 热年代学的更成熟的古测温技术获得的结果来校准长石 TL 结果。将要分析的基岩样本来自毗邻圣安德烈亚斯断层的尤卡帕海岭构造块；不列颠哥伦比亚省的 Klinaklini 冰川谷；该奖项反映了 NSF 的法定使命，并通过使用基金会的智力价值和更广泛的影响审查标准进行评估，被认为值得支持。

项目成果

Developing an internally consistent methodology for K-feldspar MAAD TL thermochronology

开发钾长石 MAAD TL 热年代学的内部一致方法

• DOI: 10.1016/j.radmeas.2022.106751
• 发表时间: 2022-04
• 期刊: Radiation Measurements
• 影响因子: 2
• 作者: Brown, N.D.;Rhodes, E.J.
• 通讯作者: Rhodes, E.J.

Which geomorphic processes can be informed by luminescence measurements?

通过发光测量可以了解哪些地貌过程？

• DOI: 10.1016/j.geomorph.2020.107296
• 发表时间: 2020-06-26
• 期刊: Geomorphology
• 影响因子: 3.9
• 作者: Nathan D. Brown

Dose-rate dependence of natural TL signals from feldspars extracted from bedrock samples

从基岩样品中提取的长石的天然 TL 信号的剂量率依赖性

• DOI: 10.1016/j.radmeas.2019.106188
• 发表时间: 2019-09-01
• 期刊: Radiation Measurements
• 影响因子: 2
• 作者: N. Brown;E. Rhodes
• 通讯作者: E. Rhodes

Reversible ice sheet thinning in the Amundsen Sea Embayment during the Late Holocene

全新世晚期阿蒙森海湾冰盖可逆减薄

• DOI: 10.5194/tc-17-1787-2023
• 发表时间: 2023-01
• 期刊: The Cryosphere
• 作者: Balco, Greg;Brown, Nathan;Nichols, Keir;Venturelli, Ryan A.;Adams, Jonathan;Braddock, Scott;Campbell, Seth;Goehring, Brent;Johnson, Joanne S.;Rood, Dylan H.;et al
• 通讯作者: et al

Revisiting erosion rate estimates from luminescence profiles in exposed bedrock surfaces using stochastic erosion simulations

使用随机侵蚀模拟重新审视裸露基岩表面发光剖面的侵蚀率估计

• DOI: 10.1016/j.epsl.2019.115842
• 发表时间: 2019-12-15
• 期刊: Earth and Planetary Science Letters
• 影响因子: 5.3
• 作者: Nathan D. Brown;Seulgi Moon
• 通讯作者: Seulgi Moon