10F_g_IgnRx - Howdoigneousrocksdiffer?

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How do igneous rocks differ? (1) Texture   -  size (2) Composition  - chemistry or mineralogy of the rocks
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Types of Textures Phaneritic   - individual grains large enough to be seen with naked eye
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Aphanitic     - individual mineral grains are present but are too small to be seen with  naked eye
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Porphyritic     - large grains embedded in a matrix of smaller grains
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Glassy  - no mineral grains form because there is no internal arrangement of  atoms
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Vesicular  - holes from where air bubble were
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Crystal/grain  size  controlled by  cooling rate Slow cooling  -  large mineral grains time for atoms to move to few sites of mineral formation   Fast cooling  - small mineral grains Extremely fast cooling  (quenching) -  no mineral grains Pophyritic texture?  
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What controls cooling rate?   - temperature contrast between magma/lava and surrounding medium  (rock/air/water) - depends on depth 0°C 30 km depth 600°C
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This note was uploaded on 02/19/2011 for the course GLY 1000 taught by Professor Vogl during the Spring '08 term at University of Florida.

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10F_g_IgnRx - Howdoigneousrocksdiffer?

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