Migmatites, charnockites and crustal fluid flux during orogenesis

造山运动过程中的混合岩、霞岩和地壳流体通量

• 批准号: DP150102773
• 负责人: Prof Ian Fitzsimons
• 金额: $ 6.66万
• 依托单位: Curtin University
• 依托单位国家: 澳大利亚
• 项目类别: Discovery Projects
• 财政年份: 2015
• 资助国家: 澳大利亚
• 起止时间: 2015-06-30 至 2017-12-31
• 项目状态: 已结题
• 来源: https://dataportal.arc.gov.au/RGS/Web/Grants/DP150102773
• 关键词: Migmatites; charnockites; crustal; fluid; flux

Migration of volatile fluid and molten rock controls many Earth processes including rock deformation and the formation of mineral and energy deposits. Deep crustal fluids are hard to study directly, and their characteristics are usually inferred from lower crustal rock brought to the surface by erosion. For over 30 years one such rock called charnockite has been used to argue that lower crust is dehydrated by influx of carbon dioxide-rich fluid, while other evidence supports dehydration by water extraction in silicate melt. This project aims to use the shape, distribution and chemistry of mineral grains to trace the passage of volatiles and melt through charnockite, constrain the nature of lower crustal fluids and resolve a long-standing controversy.

挥发性流体和熔融岩石的迁移控制着许多地球过程，包括岩石变形和矿物和能源矿床的形成。深部地壳流体很难直接研究，它们的特征通常是从侵蚀作用带到地表的下地壳岩石中推断出来的。30多年来，一种叫做紫苏花岗岩的岩石一直被用来争论下地壳是由于富含二氧化碳的流体的流入而脱水的，而其他证据则支持硅酸盐熔体中的水提取脱水。该项目旨在利用矿物颗粒的形状、分布和化学性质来追踪挥发物和熔体通过紫苏花岗岩的通道，限制下地壳流体的性质，并解决一个长期存在的争议。