porphyroclastic structure

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Potrillo volcanic field — The Potrillo Volcanic Field is a monogenetic volcanic field located on the Rio Grande Rift in New Mexico, USA and Chihuahua, Mexico. It lies convert|35|km|mi|0 west of El Paso, Texas. Rio Grande Rift *Rifting began in Late Oligocene cite book |… … Wikipedia
Cataclastic — rocks contain angular fragments formed by cataclasis. Cataclasis is a deformation of the rock caused by fracture and rotation of aggregates or mineral grains. The term cataclastic refers to the structure produced in a rock by the actions of… … Wikipedia
Foliation oblique — La foliation oblique ou texture oblique est une foliation/texture spéciale produite pendant la déformation cisaillante. Elle est bien exprimée dans les lits quartzeux des mylonites. En microtectonique cette structure sert à déterminer le sens de… … Wikipédia en Français
Oblique foliation — Oblique foliation, steady state foliation or oblique fabric is a special type of a tectonically produced foliation or fabric, most commonly in quartz rich layers. The microtectonic structure can be used to determine the shear sense in shear zones … Wikipedia
Superior craton — in the west. The western margin extends from northern Minnesota through eastern Manitoba to northwestern Ontario.The formation of the Superior craton is best explained within the context of 2.72 2.68 Ga accretion of small continental plates and… … Wikipedia

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