Three-dimensional quantitative textural analysis of metamorphic rocks using high-resolution computed X-ray tomography: Part I. Methods and techniques

摘要: Macroscopic textures resulting from different atomic-scale mechanisms for metamorphic crystallization display degrees of order, clustering, intergrowth and relative isolation porphyroblasts. Data on the sizes locations thousands crystals in a three-dimensional volume are required to identify reliably governing nucleation growth porphyroblasts these textural features. These data can now be acquired by means high-resolution computed X-ray tomography. Numerical models that simulate porphyroblast formation governed either interface-controlled or diffusion-controlled reaction indicate quantitative analysis discriminate between possibilities. numerical also allow comparison predicted measured natural samples, which inferences drawn concerning importance nature. An independent test validity such is possible as garnet may preserve prograde zoning examination normalized radius–rate relations.