Slideshow 101.16 Metamorphic Rocks

Slideshow 101.16 - Metamorphic Rocks Some metamorphic rocks Metamorphic Rocks Start with a protolith Definition Protolith parent rock what the rock

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Metamorphic Rocks Some metamorphic rocks…
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Metamorphic Rocks Definition Protolith: parent rock, what the rock was before it was metamorphosed Start with a protolith…
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Metamorphic Rocks Clast size Rock Name Comments Coarse > 2mm Conglomerat e Consists of rounded pebbles, cobbles, boulders Finer-grained  material mixed in is “matrix” Breccia Like  c o ng lo m e ra te , b ut c la s ts  a re  a ng ula r –  no t  ro unde d Medium 1/16mm to 2mm Sandstone C o ns is ts  o f s a nd s ize d g ra ins .  Typic a lly  q ua rtz o r q ua rtz + fe lds pa r (c o m m o n a nd  dura b le  m ine ra ls ).  A ro c k with a  lo t o f  fe lds pa r is  c a lle d a n “a rko s e ”. Fine 1/256  to /16mm Siltstone C o m po s e d o f s ilt-s ize d g ra ins  – typic a lly  q ua rtz Very Fine < 1/256 Shale C o m po s e d o f c la y m ine ra ls  a nd m ud (m ud is   a  re a l te rm  fo r VERY s m a ll c la s ts ) Remember…
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Metamorphic Rocks Protolith: Protolith: Conglomerate Conglomerate Deformed conglomerate Deformed conglomerate Clasts are smashed Clasts are smashed Aligned – foliated Aligned – foliated Meta Meta conglomerate” conglomerate” Foliated Foliated
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Metamorphic Rocks Protolith:  Sandstone Protolith:  Sandstone Meta Meta sandstone” sandstone” Original grains are recognizable but 
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This note was uploaded on 04/11/2008 for the course GEOL 101 taught by Professor Winstonnorrish during the Fall '07 term at Central Washington University.

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Slideshow 101.16 - Metamorphic Rocks Some metamorphic rocks Metamorphic Rocks Start with a protolith Definition Protolith parent rock what the rock

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