Es7

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Es7

  1. 1. Sedimentary rocks<br />
  2. 2. sediment<br />Solid fragments of inorganic or organic material that come from the weathering of rock and are carried and deposited by wind, water, or ice.<br />
  3. 3. 3 types of sedimentary rocks<br />1. clastic<br />2. chemical<br />3. organic<br />
  4. 4. Sedimentary rocks<br />1. clastic rocks:<br />formed from fragments of OTHER rocks.<br />e.g. shale, sandstone, conglomerate<br />2. chemical<br />3. organic<br />
  5. 5. shale<br />Shale is a clastic sedimentary rock that is made up of clay-size (less then 1/256 millimeter in diameter) weathering debris. It typically breaks into thin flat pieces. <br />
  6. 6. sandstone<br />
  7. 7. conglomerate<br />
  8. 8. 3 types of sedimentary rocks<br />1. clastic: shale, sandstone, conglomerate<br />2. chemical: sedimentary rocks formed when form when dissolved materials precipitate from solution (by evaporation or chemical action)<br />E.g. rock salt, some limestones<br />3. organic<br />
  9. 9. Rock salt (halite)<br />
  10. 10. limestone<br />
  11. 11. 3 types of sedimentary rocks<br />1. clastic: shale, sandstone, conglomerate<br />2. chemical: rock salt, some limestones<br />3. organic: formed from remains of plants and animals.<br />E.g. some limestones, coal<br />
  12. 12. limestones<br />
  13. 13. Limestone forming environment<br />a coral reef system from the Kerama Islands in the East China Sea southwest of Okinawa. Here the entire seafloor is covered by a wide variety of corals which produce calcium carbonate skeletons.<br />
  14. 14. coal<br />
  15. 15. coal<br />forms from the accumulation and preservation of plant materials, usually in a swamp environment<br />
  16. 16. 3 types of sedimentary rocks<br />1. clastic<br />2. chemical<br />3. organic<br />How do clastic rocks form<br />
  17. 17. Clastic rocks<br />1. Come from the weathering of other rocks.<br />2. From small to large fragments, ranging from pebbles to gravels to microscopic flakes.<br />3. Carried by winds, waves, and water.<br />4. sediments are deposited when a stream slows down. <br />
  18. 18. Clastic rocks<br />5. IMPORTANT: Dissolved minerals like silica, calcite, and iron oxide act as cement, or glue.<br />These minerals settle into the spaces between sand grains or pebbles, and bind the fragments. <br />
  19. 19. Sorting of sediments<br />
  20. 20. conglomerate<br />
  21. 21. conglomerate<br />Formed from pebbles, sand grains <br />Quartz is the most common mineral. (it’s very durable)<br />
  22. 22. sandstone<br />
  23. 23. sandstone<br />Formed largely from grains of quartz. <br />Up to 30% of sandstones may be air space, making them porous and permeable.<br />
  24. 24. shale<br />
  25. 25. shale<br />Formed from tiny clay flakes. (of mineral kaolin)<br />
  26. 26. shale<br />Smooth, soft, brittle<br />

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