ESCI 4

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Author:
jennnn
ID:
68522
Filename:
ESCI 4
Updated:
2011-02-23 21:02:47
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esci earth history geology
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Description:
ESCI 402 first exam UNH
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  1. The Rock Cycle
    Weathering, Transportation, Deposition, Lithification
  2. Weathering
    Physical –deterioration of pre-existing rocks throught physical actions, frost

    Chemical – chemical decomposition of pre-existing rocks (biggest cause of change)
  3. Transportation
    Movement of sedimentary materials from point of weathering to point of deposition

    • Fluid flow – flowing medium like water or air
    • may entrain or dissolve the materials andmove them (well sorted)
    • Gravity – direct reaction to force of gravity (poorly sorted)
  4. Deposition
    The settling or precipitation of sedimentary materials
  5. Clastic Sedimentary Rocks
    -Composed of redeposited terrigenous sed. particles (erosion to transport to deposition)
  6. Sorting
    • the degree to which the rock is composed of similar sized grains
    • Sorting is relative to method of disposition
    • grain size = energy sand is higher energy than
    • clay
  7. Roundness
    degree of roundness/angularity

    likely transported long distances
  8. Rock Fragment
    piece of un yet weathered protolith
  9. Non Clastic Sed. Rocks
  10. Precipitates- can be organic or inorganic
    Stalactites, cave deposits
  11. Types of Non Clastic Sed. Rocks
    Limetone-carbonates biologically precipitated from H20

    Evaporites-residue left over after evaporation of mineral rich H20 (Halite, chert)
  12. Composition
    A rock’s composition tells us about its erodability and transportablility
  13. Quartz
    is not easily eroded and not dense (last rock standing)
  14. Mafic
    weathers easily, dense, not very transportable
  15. Bioclastics
    Coquina and chalk are bioclastics
  16. Sorting classifications
    -discrete sed. grains are classified by grain size – boulders, pebbles, sand, silt, clay

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