The application of clumped isotope thermometry to the terrestrial environment

团簇同位素测温技术在陆地环境中的应用

• 批准号: DP140104093
• 负责人: Em/Prof Allan Chivas
• 金额: $ 31.44万
• 依托单位: University of Wollongong
• 依托单位国家: 澳大利亚
• 项目类别: Discovery Projects
• 财政年份: 2014
• 资助国家: 澳大利亚
• 起止时间: 2014-07-01 至 2017-06-30
• 项目状态: 已结题
• 来源: https://dataportal.arc.gov.au/RGS/Web/Grants/DP140104093
• 关键词: application; clumped; isotope; thermometry; terrestrial

Clumped-isotope geochemistry, a novel method for measuring the temperature of formation of carbonate minerals, will be applied to terrestrial materials (soil carbonates, lake deposits and speleothems) from Australia and New Zealand. The method relates the abundance or 'clumping' of rare isotopes (for example, carbon dioxide of mass 47 as carbon-13, oxygen-18, oxygen-16) extracted from carbonates to their formation temperature and is independent of the oxygen-18:oxygen-16 value of the host water from which the mineral precipitated. The materials to be investigated span the Last Glacial-Interglacial Transition and will provide robust past temperature estimates and the delta-oxygen-18 values of waters, thereby permitting hydrological balances (for example, precipitation/evaporation) to be constructed.

丛集同位素地球化学是一种测量碳酸盐矿物形成温度的新方法，将应用于澳大利亚和新西兰的陆地物质（土壤碳酸盐、湖泊沉积物和洞穴沉积物）。该方法将从碳酸盐中提取的稀有同位素（例如，质量为 47 的二氧化碳，碳 13、氧 18、氧 16）的丰度或“聚集”与其形成温度相关联，且与氧 18 无关：矿物质从中沉淀出来的原水的氧 16 值。待研究的材料跨越末次冰期-间冰期转换，并将提供可靠的过去温度估计和水域的 delta-oxygen-18 值，从而允许构建水文平衡（例如降水/蒸发）。