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

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。本计画的主要目的是开发长石热释光（TL）作为超低温热时计。一旦得到验证，这项技术将使地质学家能够：推断最近的温度扰动所造成的地貌代理人在地球表面的上部公里或两个;解决当地全新世隆起率和更好地评估地震风险在构造活跃地区;和调查其潜在的地热能源资源的网站。布朗博士还将与本科生和研究生互动，并在实施这项新技术所需的样品制备和数据分析技术方面对他们进行培训。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企及的。然而，长石热释光热年代学显示出对近地表和大气温度的敏感性，并且可以用来限制时间尺度从大约100年到100万年的连续热历史。这项研究将校准长石TL结果与更成熟的技术，从宇宙成因的3 He在石英和磷灰石4 He/3 He热年代学的古温度测量获得的结果。将被分析的基岩样本来自邻近圣安德烈亚斯断层的尤凯帕山脊构造块、不列颠哥伦比亚省的克利纳克林冰川谷和南极洲的彭萨科拉山脉。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。

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.