HCCSNORTHWEST COLLEGE PHYSICAL GEOLOGY 1403

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HCCS-NORTHWEST COLLEGEPHYSICAL GEOLOGY 1403

• IGNEOUS ROCKS

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GRANITE

• INTRUSIVE ORIGIN
• PHANERITIC TEXTURE
• SILICIC MAGMA
• CONTINENTAL CRUST
• K-FELDSPAR, QTZ, MICA

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DIORITE

• INTRUSIVE ORIGIN
• PHANERITIC TEXTURE
• SILICIC MAGMA
• CONTINENTAL CRUST
• PLAGIOCLASE, QTZ, MICA

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GABBRO

• INTRUSIVE ORIGIN
• PHANERITIC TEXTURE
• MAFIC MAGMA
• OCEANIC CRUST
• BASIC HEAVY MINERALS

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RHYOLITE

• EXTRUSIVE ORIGIN
• APHANITIC TEXTURE
• SILICIC LAVA
• CONTINENTAL CRUST
• K-FELDSPAR, QTZ, MICA

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ANDESITE

• EXTRUSIVE ORIGIN
• APHANITIC TEXTURE
• SILICIC LAVA
• CONTINENTAL CRUST
• PLAGIOCLASE, QTZ, MICA

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BASALT

• EXTRUSIVE ORIGIN
• APHANITIC TEXTURE
• MAFIC LAVA
• OCEANIC CRUST
• BASIC HEAVY MINERALS

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WELDED TUFF

• EXTRUSIVE ORIGIN
• PYROCLASTIC TEXTURE
• SILICIC LAVA
• CONTINENTAL CRUST
• ROCK FRAGMENTS

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VOLCANIC ASH

• EXTRUSIVE ORIGIN
• PYROCLASTIC TEXTURE
• SILICIC LAVA
• CONTINENTAL CRUST
• QTZ ROCK FRAGMENTS

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PUMICE

• EXTRUSIVE ORIGIN
• PYROCLASTIC TEXTURE
• SILICIC LAVA
• CONTINENTAL CRUST
• QTZ (GLASS GAS)

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OBSIDIAN

• EXTRUSIVE ORIGIN
• GLASSY TEXTURE
• SILICIC/MAFIC LAVA
• CONTINENTAL OR OCEANIC CRUST
• QUARTZ