Investigating effects of aqueous speciation in 13C-18O clumping and its implications for paleothermometry

研究水相形态对 13C-18O 聚集的影响及其对古测温法的影响

• 批准号: 1325054
• 负责人: Aradhna Tripati
• 金额: $ 10万
• 依托单位: University of California-Los Angeles
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2014
• 资助国家: 美国
• 起止时间: 2014-04-01 至 2015-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1325054&HistoricalAwards=false
• 关键词: Investigating; effects; aqueous; speciation; 13C

The recently established "clumped isotope" paleothermometer is based on the Carbon 13 - Oxygen 18 bond abundance in carbonate minerals. Although this technique is becoming more widely used, there are still many questions about the underlying processes that control geochemical signatures in bio-minerals and non-biologically formed minerals. This project will address several of these outstanding questions. Investigators will compare results from theoretical calculations and experiments to observations, including from slowly-grown naturally occurring samples such as the Devils Hole speleothem and deep-sea corals of variable mineralogy. This work should improve the ability to employ clumped isotopes in surface and subsurface systems, and identify the limitations of this technique. This work will be highlighted in UCLA's annual Physical Sciences Outreach Day that brings 2000-3000 members of the public to the campus and a few hundred people to the exhibits. All of the participants in this project will also conduct a mineral precipitation activity with school children as part of a regular outreach program the PI runs. Support of this project will benefit an early career PI who is establishing a NSF-supported state-of-the-art isotope lab and is committed to recruiting, mentoring, and supporting outstanding early career scientists from diverse backgrounds, thus furthering NSF's goals to support underrepresented groups in the Earth Sciences.

最近建立的“团块同位素”的古热计基于碳酸盐矿物质中的碳13-氧18键丰度。尽管该技术正在越来越广泛地使用，但仍然存在许多有关控制生物融化和非生物学形成的矿物质地球化学特征的基础过程的问题。该项目将解决这些杰出问题中的几个。研究者将将理论计算和实验的结果与观察结果进行比较，包括从缓慢生长的天然样品（例如魔鬼孔斑点和可变矿物学的深海珊瑚）进行比较。这项工作应提高在表面和地下系统中采用汇总同位素的能力，并确定该技术的局限性。这项工作将在UCLA的年度物理科学外展日重点介绍，该日将2000-3000名公众带到校园，并将数百人带到展览中。该项目的所有参与者还将与小学生进行矿物降水活动，这是PI运行的常规外展计划的一部分。对该项目的支持将使早期的职业生涯受益，该职业生涯正在建立一个由NSF支持的最先进的同位素实验室，并致力于招募，指导和支持来自不同背景的杰出早期职业科学家，从而进一步推动了NSF的目标，以支持地球科学中代表性不足的群体。