Lecture 11 Feb 13 2008 Clastic sedimentary rocks

Lecture 11 Feb 13 2008 Clastic sedimentary rocks - Dinosaur...

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Dinosaur National Monument, Utah
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(Note: the volume and area of metamorphic rocks are divided between igneous and sedimentary, in accord with the type of parent rock that was metamorphosed.) Earth’s crust is mostly igneous rock. The very thin surficial layer that humans occupy, however, is mostly sedimentary. 95% igneous 25% igneous
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Sediments must accumulate for sedimentary rocks to form.
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Each sedimentary environment has characteristic environmental conditions and geological processes. Continental River (alluvial) Desert Lake Glacier Shoreline Delta Tidal flat Beach Marine Shelf Slope Reef Deep sea
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Layered sedimentary rocks (mostly sandstone) in the Marble Canyon section of the Grand Canyon, Arizona. These rocks were subjected to lithostatic pressure upon burial under accumulating sediments. Temperatures may reach 200 C. Pressures may reach 3 to 4 kb.
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Lithification is the process that hardens and binds sediment into sedimentary rock – by compaction and cementation.
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Lecture 11 Feb 13 2008 Clastic sedimentary rocks - Dinosaur...

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