Igneous Rock Composition
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Flashcards
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7 cardsGeology Common Igneous Rocks
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1 cardsUntitled What is the difference between Mafic and Felsic?
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2 cardsMafic and Felsic
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3 cardsIgneous Rocks What is Magma composed of?
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4 cardsMain Mineral Main minerals in felsic, intermediate, mafic, ultramafic
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3 cardsSilica Content Obsidian is a silica rock from what location
Flowcharts
Notes
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Identifying Mafic and Ultramafic Igneous Rocks Mafic Igneous RocksShould be dark in colour - due to ferromagnesian minerals (pyroxne augite, and sometimes olivine with Ca-rich plagioclase but no quartz)Low silica magma only 45-52% silica Low viscosity, so reaches ...
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Identifying Silicic and Intermediate Igneous Rocks crystal grain size to tell you the rate of cooling mineral composition and colour for silica content igneous textures for origin Silicic Igneous RocksHigh silica magma contains 66 to 75% silica and is mainly generated...
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Basalts Basalt - Basalts exist in variety of tectonic environments such as Mid-ocean ridges, island arcs, back arc, basins, intra-plate oceanic islands, large igneous provinces, and intra- continental rifts).-Basalt a fine gr...
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Basalt - Basalt a fine grained mafic igneous rock consisting augite + calcic plagioclase.(augite is a high-Ca pyroxene and Calcic plagioclase refers to plagioclase crystals contain more anorthite than albite.-Basalt exist in...