The geochemistry of trace elements with variable oxidation states

具有可变氧化态的微量元素的地球化学

• 批准号: DP0449796
• 负责人: Prof Katy Evans
• 金额: $ 8.36万
• 依托单位: The Australian National University
• 依托单位国家: 澳大利亚
• 项目类别: Discovery Projects
• 财政年份: 2004
• 资助国家: 澳大利亚
• 起止时间: 2004-01-01 至 2006-01-01
• 项目状态: 已结题
• 来源: https://dataportal.arc.gov.au/RGS/Web/Grants/DP0449796
• 关键词: geochemistry; trace; elements; variable; oxidation

The understanding of many earth processes is based upon an interpretation of differences in the relative abundance and/or distribution of elements which occur in more than one oxidation state. However, the redox states that control the geochemical behaviour of an element in a melt are not necessarily retained on cooling. This work aims to determine the oxidation states of geologically important elements, in situ under magmatic conditions, using XANES spectroscopy. The results will allow geological signatures to be correctly interpreted and allow models for topics ranging from ancient mantle temperatures to rates of melt migration to be better constrained.

对许多地球过程的理解是基于对以一种以上氧化态出现的元素的相对丰度和/或分布差异的解释。 然而，控制熔体中元素地球化学行为的氧化还原状态在冷却时不一定保留。 这项工作的目的是确定地质上重要的元素的氧化态，在岩浆条件下，使用XANES光谱。 这些结果将使地质特征得到正确的解释，并使从古代地幔温度到熔体迁移速率等主题的模型得到更好的约束。