sedimentary_rocks

sedimentary_rocks - Formed at or near Earths surface by:...

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Unformatted text preview: Formed at or near Earths surface by: Cementing together of shell fragments or loose grains derived from existing rocks Precipitation of minerals from water solutions Growth of skeletal material in organisms Sedimentary Rocks The Next Phase in the Rock Cycle, after weathering, Alteration, Erosion, and Transport Book Cliffs, Utah Several stages in life-cycle of sedimentary rocks 1. Break apart existing rocks + minerals to form sediment --- weathering 2. Move sediment particles -------------------------------- erosion & transport 3. Redeposit or precipitate the sediment --------sedimentation/deposition 4. Consolidate, cement, and lithify into rock ---------------------- lithification Tim Davis/Photo Researchers Weathering and Sediment Formation Why does weathering occur?- Exposure to elements- Gravity Rules!- Rocks on land are Constantly being attacked- Graveyard in oceans VS. Which setting is in disequilibrium? Ocean Basin Mountain Range What are Sedimentary Rocks? What are Sedimentary Rocks? Rock formed at/near Earths surface by: Rock formed at/near Earths surface by: precipitation of minerals from solution precipitation of minerals from solution growth of skeletal material in organism growth of skeletal material in organism cementing together of shell &/or loose cementing together of shell &/or loose grains derived from existing rocks grains derived from existing rocks occur in the upper crust as a veneer occur in the upper crust as a veneer covering older igneous + metamorphic covering older igneous + metamorphic rocks rocks cover ~80% of Earths surface, but cover ~80% of Earths surface, but constitute < 1% of its total volume constitute < 1% of its total volume can be as much as 20km thick beneath can be as much as 20km thick beneath continental shelves continental shelves accumulate in layers - provide accumulate in layers - provide historical historical record record of ancient events + environments of ancient events + environments A few things about sediments & sedimentary rocks ... A few things about sediments & sedimentary rocks ... What are Sediments? What are Sediments? Loose rock fragments Loose rock fragments Mineral grains Mineral grains Shells Shells Mineral crystals that precipitated directly out Mineral crystals that precipitated directly out of water of water e.g. halite, gypsum, calcite e.g. halite, gypsum, calcite *Unconsolidated* *Unconsolidated* (detritus) (detritus) 1. 1. Weathering Weathering- break-up and decomposition (physical - break-up and decomposition (physical & chemical alteration) of rock at or near Earth's & chemical alteration) of rock at or near Earth's surface....
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sedimentary_rocks - Formed at or near Earths surface by:...

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