GEO 1111 Lecture Notes - Lecture 4: Mid-Ocean Ridge, Biotite, Mica

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Geo1111 - lecture 4 - rock types disrupt the chemical bound of other. : happens along the plate margins and subduction zones. : high pressure causes higher temperature to melt solids. The oceanic ridge is where the most volcanic rocks are produced. May have no crystals or either small or large ones. Basalt id the archetype and is found on oceanic floor. Granite is the archetype and is found on continents. Rare composition that is made out of olivine and pyroxene. A slower rate will give less (but larger) crystals while a faster rate will have the opposite effect. The crystals can be seen without the help of a microscope. The crystals are microscopic and may contain holes. The large ones are stuck in the matrix (groundmass) of the smaller ones because of two different rates of cooling. Glassy: there"s no crystal visible (obsidian and pumice). It has a fast rate of cooling and a high gas concentration.

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