Identifying the secular evolution of chemical heterogeneity in the mantle as probed by deep mantle plumes

通过深部地幔柱探测确定地幔化学异质性的长期演化

• 批准号: FT140101062
• 负责人: A/Prof Oliver Nebel
• 金额: $ 52.93万
• 依托单位: Monash University
• 依托单位国家: 澳大利亚
• 项目类别: ARC Future Fellowships
• 财政年份: 2015
• 资助国家: 澳大利亚
• 起止时间: 2015-03-01 至 2021-03-31
• 项目状态: 已结题
• 来源: https://dataportal.arc.gov.au/RGS/Web/Grants/FT140101062
• 关键词: Identifying; secular; evolution; chemical; heterogeneity

This project aims to focus on modes and timescales of melting associated with deep mantle plumes. These melts form massive magmatic bodies and volcanic flood basalt provinces throughout Earth’s history and record the secular chemical evolution of the Earth’s mantle. Selective igneous bodies contain high-grade noble metal deposits and coincide with global mass extinction linked to anoxic ocean events in response to atmospheric volcanic pollution. This project aims to provide knowledge of planetary surface evolution in response to mantle dynamics, place constraints on enrichment processes of metals in ore quality in plume-derived melts, and may help understandings of the relation between massive volcanic eruptions and climate variability.

该项目的目的是重点研究与深地幔柱有关的熔融模式和时间尺度。这些熔体形成了贯穿地球历史的巨大岩浆体和火山溢流玄武岩区，并记录了地球地幔的长期化学演化。选择性的火成岩体含有高品位的贵金属矿床，并与全球大规模灭绝相吻合，这与大气火山污染造成的缺氧海洋事件有关。该项目旨在提供行星表面演变对地幔动力学的反应的知识，限制地幔柱熔融物中矿石质量中金属的富集过程，并可能有助于理解大规模火山爆发与气候变化之间的关系。