Geochemistry of Amino Acid Racemization and Geological Applications

氨基酸外消旋地球化学及其地质应用

• 批准号: 8816391
• 负责人: Richard Mitterer
• 金额: $ 13.52万
• 依托单位: University of Texas at Dallas
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1988
• 资助国家: 美国
• 起止时间: 1988-12-15 至 1993-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8816391&HistoricalAwards=false
• 关键词: Geochemistry; Amino; Acid; Racemization; Geological

The long-term goals of this project are to understand the fundamental mechanisms and kinetics of amino acid racemization reactions through laboratory experiments using simple peptides, to apply amino acid racemization reactions to stratigraphic and geochronologic investigations of Quaternary and Neogene deposits, and to improve age determinations through a better understanding of racemization reaction rates and mechanisms. To accomplish these goals, continued research will be done on the role of calcium carbonate in isoleucine epimerization reactions, in refining the parabolic kinetic model and in developing new approaches to obtain calibration ages for Quaternary fossils using isotopes. Field projects in Bermuda and New Province Island will be completed. Amino acid racemization dating of sediments and fossils has been a significant tool used by field stratigraphers and paleontologists. Successful use of this technique depends on investigation of factors affecting chemical changes in the sedimentary environment and within fossils to establish accurate chronology. Therefore, the research is of major importance to geoscientists.

该项目的长期目标是通过使用简单多肽的实验室实验了解氨基酸外消旋反应的基本机理和动力学，将氨基酸外消旋反应应用于第四纪和新近纪沉积物的地层和地质年代学研究，并通过更好地了解外消旋反应速率和机理来改进年龄测定。为了实现这些目标，将继续研究碳酸钙在异亮氨酸异构化反应中的作用，改进抛物线动力学模型，并开发利用同位素获得第四纪化石定标年龄的新方法。百慕大和新省岛的实地项目将完成。沉积物和化石的氨基酸外消旋测年一直是野外地层学家和古生物学家使用的一种重要工具。这项技术的成功使用取决于对沉积环境和化石内影响化学变化的因素的调查，以建立准确的年代学。因此，这项研究对地球科学家具有重要意义。