A porphyroblast is a large mineral crystal in a metamorphic rock which has grown within the finer grained matrix. Porphyroblasts are commonly euhedral crystals, but can also be partly to …

Porphyroblasts are a valuable source of information on local tectonic and metamorphic evolution. Inclusion patterns in porphyroblasts can mimic the structure in the rock at the time of their …

Porphyroblasts are crystals of metamorphic minerals with a size significantly larger than that of the matrix phases. The microstructures they form, in particular their size and abundance …

porphyroblastic means a porphyritic-like texture (coarse grains in a finer matrix) that is of metamorphic origin. blastoporphyritic indicates an igneous porphyritic texture that survived …

Phenocrystic texture exists in igneous rocks, when certain crystals are conspicuously larger than the matrix of a thin section, or the rest of a rock. These larger crystals are called phenocrysts …

Some metamorphic rocks have bimodal grain sizes, meaning that they contain mineral crystals of two distinct sizes. Such rocks, termed porphyroblastic rocks, contain large crystals surrounded …

2022年8月28日 · While minerals that are already present recrystallize, new metamorphic minerals may grow and modify rock texture. If minerals develop into large crystals that contrast in size …

This paper reviews ten current applications of these microstructures: (1) porphyroblast growth-timing criteria; (2) tracking progressive foliation develop-ment relative to changing …

A porphyroblast (porphyry, plus Greek blastos, to sprout) is a large crystal that has grown in a metamorphic rock (Fig. 1; Becke, 1903). The term megacryst refers to a large crystal and is …

Primary texture formation in many porphyroblastic rocks is the cumulative effect of the evolution and interaction of features produced by diffusion-controlled nucleation and growth (DCNG).