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- Porphyroblast abstract "A porphyroblast is a large mineral crystal in a metamorphic rock which has grown within the finer grained groundmass. Porphyroblasts are commonly euhedral crystals, but can also be partly to completely irregular in shape.The most common porphyroblasts in metapelites (metamorphosed mudstones and siltstones) are garnets and staurolites, which stand out in well foliated metapelites (such as schists) against the platy mica matrix.A similar type of crystal is a phenocryst, a large crystal in an igneous rock. Porphyroblasts are often confused with porphyroclasts, which can also be large outstanding crystals, but which are older than the matrix of the rock.If a porphyroblastic mineral has small inclusions of minerals within it, the mineral is described as poikiloblastic. This observation can help interpret deformation history.A rock which has many porphyroblasts is described as having a porphyroblastic texture. As porphyroblasts grow, the foliation may be preserved as oriented inclusions trapped by the porphyroblast as it overgrows them, and this is helpful for tracking changing deformation planes.In metamorphic rocks that experience deformation during metamorphism, porphyroblasts may grow before, during, or after the phase of deformation recorded by the matrix minerals. The relationship of porphyroblast growth to deformation is typically evaluated by comparing the shape orientation of trails of mineral inclusions in the porphyroblast to the matrix fabric. Some garnet porphyroblasts contain various curving trails of quartz and other mineral inclusions. The question of whether porphyroblasts (and garnet in particular) rotate during metamorphism and deformation has long been the subject of debate. Whereas most researchers are convinced that porphyroblast may rotate during deformation, some believe that porphyroblasts do not rotate. As they grow, the foliation is preserved in their crystal structure, which is helpful for tracking changing deformation planes.".
- Porphyroblast thumbnail Almandine.jpeg?width=300.
- Porphyroblast wikiPageID "3495304".
- Porphyroblast wikiPageLength "2619".
- Porphyroblast wikiPageOutDegree "22".
- Porphyroblast wikiPageRevisionID "607155195".
- Porphyroblast wikiPageWikiLink Category:Metamorphic_petrology.
- Porphyroblast wikiPageWikiLink Crystal.
- Porphyroblast wikiPageWikiLink Euhedral_and_anhedral.
- Porphyroblast wikiPageWikiLink Foliation_(geology).
- Porphyroblast wikiPageWikiLink Garnet.
- Porphyroblast wikiPageWikiLink Igneous_rock.
- Porphyroblast wikiPageWikiLink List_of_rock_textures.
- Porphyroblast wikiPageWikiLink Matrix_(geology).
- Porphyroblast wikiPageWikiLink Metamorphic_rock.
- Porphyroblast wikiPageWikiLink Mica.
- Porphyroblast wikiPageWikiLink Mineral.
- Porphyroblast wikiPageWikiLink Mudstone.
- Porphyroblast wikiPageWikiLink Pelite.
- Porphyroblast wikiPageWikiLink Phenocryst.
- Porphyroblast wikiPageWikiLink Poikiloblast.
- Porphyroblast wikiPageWikiLink Porphyroclast.
- Porphyroblast wikiPageWikiLink Rock_microstructure.
- Porphyroblast wikiPageWikiLink Schist.
- Porphyroblast wikiPageWikiLink Siltstone.
- Porphyroblast wikiPageWikiLink Staurolite.
- Porphyroblast wikiPageWikiLink File:Almandine.jpeg.
- Porphyroblast wikiPageWikiLink File:Garnet_Mica_Schist_Syros_Greece.jpg.
- Porphyroblast wikiPageWikiLinkText "Porphyroblast".
- Porphyroblast wikiPageWikiLinkText "porphyroblast".
- Porphyroblast wikiPageUsesTemplate Template:Citation_needed.
- Porphyroblast wikiPageUsesTemplate Template:Unreferenced.
- Porphyroblast subject Category:Metamorphic_petrology.
- Porphyroblast hypernym Crystal.
- Porphyroblast type ChemicalCompound.
- Porphyroblast comment "A porphyroblast is a large mineral crystal in a metamorphic rock which has grown within the finer grained groundmass.".
- Porphyroblast label "Porphyroblast".
- Porphyroblast sameAs Q957083.
- Porphyroblast sameAs Porphyroblast.
- Porphyroblast sameAs פורפירובלסט.
- Porphyroblast sameAs Porfyroblast.
- Porphyroblast sameAs Porfyroblast.
- Porphyroblast sameAs m.09gmc1.
- Porphyroblast sameAs Порфиробластическая_структура.
- Porphyroblast sameAs Порфиробласт.
- Porphyroblast sameAs Порфіробласти.
- Porphyroblast sameAs Q957083.
- Porphyroblast wasDerivedFrom Porphyroblast?oldid=607155195.
- Porphyroblast depiction Almandine.jpeg.
- Porphyroblast isPrimaryTopicOf Porphyroblast.