Web1. júl 2000 · Olivine phenocryst compositions and whole-rock chemical compositions are used to identify primitive picrite basalts from widely separated parts of the Deccan flood basalt province. Overall, primitive picrites constitute a significant volume of … WebPhenocrysts are free-growth (unimpeded) forms that have developed while supported by a fluid phase. Slowly grown crystals tend to be more nearly perfect, whereas rapidly grown crystals contain twins, zoning, mosaic structure, and …
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WebA phenocryst is an early forming, relatively large and usually conspicuous crystal distinctly larger than the grains of the rock groundmass of an igneous rock. Such rocks that have a … Web17. jún 2009 · This means that phenocryst-free magma emplaced into a crustal chamber of any size will crystallize into a solid body with an essentially homogeneous composition from top to bottom. To explain the existence of layered intrusions that show clear evidence of magmatic differentiation, the hypothesis introduced another simple physical explanation ... WebOther articles where phenocryst is discussed: feldspar: Crystal structure: …in pegmatite masses, or as phenocrysts within porphyries. (A porphyry is an igneous rock containing conspicuous crystals, called phenocrysts, surrounded by a matrix of finer-grained minerals or glass or both.) In most rocks, both alkali and plagioclase feldspars occur as irregularly … chlorhexidine alcohol swab