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porphyroblastic

   Also found in: Dictionary/thesaurus 0.01 sec.
porphyroblastic [pȯr¦fir·ə¦blas·tik]
(petrology)
Pertaining to the texture of recrystallized metamorphic rock having large idioblasts of minerals possessing high form energy in a finer-grained crystalloblastic matrix.


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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.
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.
 
 
 
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