petrologically การใช้

• They are very commonly porphyritic, petrologically indistinguishable from lavas of similar composition.
• Petrologically, ignimbrites are derived from dacitic rhyodacitic magmas.
• The petrologically similar lavas show evidence of a differentiation by flow and gravity and have trachytic textures.
• Petrologically, the El Toro field rocks belong to potassium-rich andesite-basaltic andesite-basalt.
• Cretaceous rocks, deposited near their provenance areas, tend to be petrologically immature, and secondary porosity in them may be hard to predict.
• He was first to recognize that both ocean floors and island arcs were incorporated in continental orogenic complexes ( although the mechanism was not then clear ) and could be discriminated petrologically, and that the Basin and Range region had doubled in width by crustal extension.
• For example, slab rollback predicts, structurally, a microcontinent with thrust faulting at the base, petrologically, it is associated with back-arc spreading, and chronologically, subduction to exhumation may take approximately 15 million years with a monotonic down-dip gradient in ages.
• Further evidence that indicate lithospheric thickening beneath the middle portion of Stikinia include the increased profusion of cognate inclusion and plagioclase megacrysts in volcanic rocks from the southern portion of the volcanic province, which might be evidence of magma ponding and magma crystallization in the lithosphere before a volcanic eruption, and the restricted existence of petrologically evolved rock types in the southern half of the Northern Cordilleran Volcanic Province.