Definition of Porphyroclasts. Meaning of Porphyroclasts. Synonyms of Porphyroclasts

- A porphyroclast is a clast or mineral fragment in a metamorphic rock, surrounded by a groundm**** of finer grained crystals. Porphyroclasts are fragments...
- sense indicators are C/S fabrics, asymmetric porphyroclasts, vein and **** arrays, mantled porphyroclasts and mineral fibers. All of these indicators have...
- from tectonic reduction of grain size, and commonly containing rounded porphyroclasts and rock fragments of similar composition to minerals in the matrix...
- occurs adjacent to a relatively large, undeformed particle, such as a porphyroclast. Pressure shadows often appear in thin sections as pairs of roughly...
- contains characteristic elliptic or lenticular shear-bound grains (porphyroclasts), normally feldspar, surrounded by finer grained material. The finer...
- orientation (CPO). mantled and winged porphyroclasts. Well-known examples are theta (Θ)-objects and phi (Φ)-porphyroclasts, as well as sigma (σ)- and delta...
- crystal in an igneous rock. Porphyroblasts are often confused with porphyroclasts, which can also be large outstanding crystals, but which are older than...
- NE-SW-trending mineral lineation defined by quartz ribbons, elongate orthoclase porphyroclasts, and flakes of biotite and occasional muscovite. The composition of...
- can give sense of shear include: sigmoidal veins mica fish rotated porphyroclasts asymmetric boudins (Figure 1) asymmetric folds Transpression regimes...
- metamorphic minerals relative to a phase of deformation—before deformation porphyroclast—after deformation porphyroblast. Igneous textures include such properties...