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Student Concept Map

Student Concept Map. Sedimentary Rocks. Dr. David Steer. Rock Cycle. Group discussion time. Given: Bag of sedimentary rocks. Group these rocks in some manner. Grouping items. Remember this exercise?. Grouping items. Group these objects in some logical way. Depositional setting (3)

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Student Concept Map

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  1. Student Concept Map

  2. Sedimentary Rocks Dr. David Steer

  3. Rock Cycle

  4. Group discussion time • Given: • Bag of sedimentary rocks Group these rocks in some manner.

  5. Grouping items • Remember this exercise?

  6. Grouping items • Group these objects in some logical way.

  7. Depositional setting (3) Texture Grouping items • Group these objects in some logical way. Throw Target Use only hands Hit with a stick Kick

  8. Sedimentary Rocks: Deposition • Clastic (detrital) sedimentary rocks – • composed of sediments, rock and mineral fragments formed when rocks disintegrate at or near the earth's surface. • Chemical sedimentary rocks • precipitated from a solution (e.g. sea-water) as the result of changing physical conditions (e.g. evaporation). • Biochemical sedimentary rocks – • formed by the actions of living organisms or composed of the remains of dead organisms.

  9. Clastic or Detrital Sedimentary Rocks • Clastic sediments Classified based on: • coarse grain size particles • (gravel, includes pebbles, cobbles and boulders), • medium grain size • (sand) • fine grain size • (silt) gritty feel of sample • very fine sediment • (clay) too fine to see May appear layered

  10. Clastic Rocks Classified

  11. Review • Which rock is most likely sedimentary? Temperature when formed A B Depth C E D

  12. Examples of clastic sedimentary rocks • Mudstone • Fine grained low energy • Sandstone • Medium grained moderate energy • Individual grains visible in samples • Conglomerate • Medium to coarse grained high energy

  13. Chemical Sedimentary Rocks • Chemical sedimentary rocks – • precipitated from a solution (e.g. sea-water) as a result of changing physical conditions (e.g. evaporation). • May be difficult to see layers • Biochemical sedimentary rocks – • formed by the actions of living organisms or composed of the remains of dead organisms. • Fossils usually apparent

  14. Examples of Biochemical Sedimentary Rocks • Limestones • form when marine organisms die and their skeletons accumulate. • Coal • forms when land plants die and their organic tissue accumulate.

  15. Concept Map • Construct a concept map that guides you through classifying a sedimentary rock. Classify these rocks.

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