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porphyroblast
(redirected from porphyroblastic)

    Also found in: Encyclopedia 0.01 sec.
porphyroblast  (pôr-fîr--blst)
A large crystal that is surrounded by a finer-grained matrix in a metamorphic rock. Porphyroblasts form by the recrystallization of existing mineral crystals during metamorphism. They are analogous to phenocrysts in igneous rock.
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One of the first five holes (166) was unplanned and targeted the north strike extension of barren mineralization cut in the 31 Vein (Hole 163), which exhibited deformation of late porphyroblastic overgrowths, a feature which has proven to occur within approximately 10 meters of most oreshoots within the Comet Veins.
U.S. Energy Corp. Announces That Sutter Gold Intersects High-Grade ... by PR Newswire
Textures in staurolite-oligoclase porphyroblastic p elite within the Cranberry Point Shear Zone indicate peak metamorphism was synchronous with localized crenulation of S1 around steep axes.
Atlantic Geoscience Society by Atlantic Geology
 
 
 
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