Migmatites, charnockites and crustal fluid flux during orogenesis

挥发性流体和熔岩的迁移控制着许多地球过程，包括岩石变形和矿物和能量沉积的形成。深部地壳流体很难直接研究，它们的特征通常是从侵蚀带到地表的下地壳岩石推断出来的。30多年来，一种名为紫苏花岗岩的岩石一直被用来论证下地壳是由于富含二氧化碳的液体的涌入而脱水，而其他证据则支持通过在硅酸盐熔体中提取水来脱水。该项目旨在利用矿物颗粒的形状、分布和化学成分来追踪挥发分和熔体通过沸石的通道，限制下地壳流体的性质，并解决一个长期存在的争议。

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.