Rehydration of the lower crust, fluid sources and geophysical expression

下地壳的再水化、流体来源和地球物理表达

• 批准号: DP160104637
• 负责人: Prof Martin Hand
• 金额: $ 24.44万
• 依托单位: The University of Adelaide
• 依托单位国家: 澳大利亚
• 项目类别: Discovery Projects
• 财政年份: 2016
• 资助国家: 澳大利亚
• 起止时间: 2016-06-01 至 2020-12-31
• 项目状态: 已结题
• 来源: https://dataportal.arc.gov.au/RGS/Web/Grants/DP160104637
• 关键词: Rehydration; lower; crust; fluid; sources

This project aims to explore a long-standing mystery: the origin of deep crustal electrical conductors detected by magnetotelluric imaging of tectonically stable crust. These features occur in cratons of all ages, and commonly cross cut structures and lithologies. This project aims to investigate the hypothesis that such features are the record of ancient deep crustal fluid flow, which modified the rock electrical properties. Using an exceptionally exposed natural laboratory preserving large-scale rehydration of anhydrous lower crust, the project plans to determine the source of fluids and the compositional changes they induced. It then plans to experimentally determine changes in resistivity induced by fluid flow and use that data to model the magnetotelluric response at crustal scale.

该项目旨在探索一个长期存在的谜团：通过构造稳定地壳的大地电磁成像检测到的地壳深部电导体的起源。这些特征出现在所有时代的岩石中，通常是横切构造和岩性。该项目旨在研究这样的假设，即这些特征是古代深部地壳流体流动的记录，它改变了岩石的电特性。该项目计划利用一个特别暴露的自然实验室，保存无水下地壳的大规模再水化，以确定流体的来源及其引起的成分变化。然后，它计划通过实验确定流体流动引起的电阻率变化，并利用这些数据模拟地壳尺度的大地电磁响应。