Development of New Techniques: Sustaining and sharpening amino acid geochronology

新技术的开发：维持和加强氨基酸地质年代学

• 批准号: 1855381
• 负责人: Darrell Kaufman
• 金额: $ 30.81万
• 依托单位: Northern Arizona University
• 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: 2019-07-01 至 2023-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1855381&HistoricalAwards=false
• 关键词: Development; New; Techniques; Sustaining; sharpening

Determining the ages of geological materials (geochronology) is fundamental to understanding Earth's history. Amino acid racemization (AAR) geochronology is a dating method applicable to a wide range of fossils types, depositional environments, and time scales. It enables research in a broad range of geoscience topics such as archeology, historical ecology, paleontology, tectonic geomorphology, paleoceanography, glacial geology, and others. This award will support scientific infrastructure by sustaining the laboratory for AAR geochronology at Northern Arizona University. This project will sharpen one of the most outstanding untapped applications of AAR geochronology: as a dating method for marine sediment cores using foraminifera. Various procedures will be tested to reduce analytical variability, a major source of error for AAR geochronology when applied to foraminifera. Several widely occurring foraminifera taxa will be subjected to chemical pre-treatments to isolate a fraction of amino acids that is less prone to post-depositional environmental influences. Once optimized, the treatment will be applied to samples from a network of stratigraphic reference horizons from well-dated deep-sea cores. The data will be used to evaluate the reproducibility of AAR geochronology among the sites and to calibrate the rate of racemization for several reference species. Samples from other sites will be used to quantify the possible influence of different geothermal gradients on the extent of racemization in foraminifera. Recently developed data-analytical approaches will be employed to model the time-dependent rate of racemization and to characterize age uncertainties.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.

确定地质材料的年龄（地质年代学）是了解地球历史的基础。氨基酸消旋（AAR）年代学是一种适用于广泛的化石类型、沉积环境和时间尺度的定年方法。它使研究范围广泛的地球科学主题，如考古学，历史生态学，古生物学，构造地貌学，古海洋学，冰川地质学等。该奖项将通过支持北方亚利桑那大学的AAR地质年代学实验室来支持科学基础设施。该项目将加强AAR地质年代学最突出的未开发应用之一：作为利用有孔虫确定海洋沉积物岩心年龄的方法。各种程序将进行测试，以减少分析的可变性，一个主要的错误来源AAR地质年代学时，适用于有孔虫。几种广泛存在的有孔虫类群将进行化学预处理，以分离出一部分不太容易受到沉积后环境影响的氨基酸。一旦得到优化，这种处理方法将应用于从年代久远的深海岩心的地层参考层网络中提取的样品。这些数据将被用来评估的再现性AAR地质年代学的网站之间，并校准外消旋化率为几个参考物种。其他地点的样品将用于量化不同地热梯度对有孔虫外消旋化程度的可能影响。最近开发的数据分析方法将被用来模拟与时间相关的外消旋化速率和表征年龄的不确定性。该奖项反映了NSF的法定使命，并已被认为是值得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的支持。

项目成果

Millennial‐Scale Age Offsets Within Fossil Assemblages: Result of Bioturbation Below the Taphonomic Active Zone and Out‐of‐Phase Production

化石组合内的千禧年尺度年龄偏移：埋藏活动区以下生物扰动和阶段外生产的结果

• DOI: 10.1029/2018pa003553
• 发表时间: 2019
• 期刊: Paleoceanography and Paleoclimatology
• 影响因子: 3.5
• 作者: Tomašových, A.;Kidwell, S. M.;Alexander, C. R.;Kaufman, D. S.
• 通讯作者: Kaufman, D. S.

Testing the effect of oxidizing pre-treatments on amino acids in benthic and planktic foraminifera tests

在底栖和浮游有孔虫测试中测试氧化预处理对氨基酸的影响

• DOI: 10.1016/j.quageo.2022.101401
• 发表时间: 2022
• 期刊: Quaternary Geochronology
• 影响因子: 2.7
• 作者: Millman, Emily;Wheeler, Lucy;Billups, Katharina;Kaufman, Darrell;Penkman, Kirsty E.H.
• 通讯作者: Penkman, Kirsty E.H.

Can amino acid racemization be utilized for fish age validation?

• DOI: 10.1139/cjfas-2022-0161
• 发表时间: 2023-02-01
• 期刊: CANADIAN JOURNAL OF FISHERIES AND AQUATIC SCIENCES
• 影响因子: 2.4
• 作者: Chamberlin, Derek W.;Shervette, Virginia R.;Patterson III, William F.
• 通讯作者: Patterson III, William F.

NOAA/WDS Paleoclimatology - Quaternary Arctic Ocean Foraminifer Amino Acid Racemization Data

NOAA/WDS 古气候学 - 第四纪北冰洋有孔虫氨基酸外消旋化数据

• DOI: 10.25921/bx56-4d69
• 发表时间: 2023
• 期刊: NOAA National Centers for Environmental Information
• 作者: West, G.;Kaufman, D.S.;Jakobsson, M.;O'Regan, M.
• 通讯作者: O'Regan, M.

The Whale Point Formation: A stratigraphic record of high-frequency climate and sea-level fluctuations in the Bahamas during Marine Isotope Stage 5a (ca. 80 ka BP)

鲸鱼点地层：海洋同位素阶段 5a（约 80 ka BP）期间巴哈马高频气候和海平面波动的地层记录

• DOI: 10.1016/j.sedgeo.2022.106107
• 发表时间: 2022
• 期刊: Sedimentary Geology
• 影响因子: 2.8
• 作者: Kindler, Pascal;Hearty, Paul J.
• 通讯作者: Hearty, Paul J.