Lecture13 tectonics&weathering
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Lecture13 tectonics&weathering

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    Lecture13 tectonics&weathering Lecture13 tectonics&weathering Presentation Transcript

    • Announcements Exam 1 review session: Monday the 21 st at 5pm Here in McG-S room 20 Bring questions! Exam 1 itself: Wednesday the 23 rd
    • Quiz #4
    • Question 6 A B Question 1
    • Linking Volcanism and Faulting to Plate Tectonics
    • Geologic Excitement at Tectonic Plate Boundaries Hawaii?
    • World Hot Spots
    •  
    • Hot spots = individual, stationary sites of upwelling from mantle
    • Hawaiian Islands Lots of basaltic volcanism Islands become older to the NW Newer Older Oldest
    • Hot spot development over time
    • Hot spots: Hawaii
    •  
    • Pacific-North American Boundary
    • One tiny problem We haven’t found good evidence for plumes yet… Maybe they’re too small for our technology to see. Maybe they don’t exist. Big debate right now: plume theory vs. crack theory
    • Normal Faults: Basin and Range
    • Normal Faults: Basin and Range Grabben Horst ← Extension ->
    • Why is Nevada pulling apart?
    • Why is Nevada pulling apart? 30+ m.y.a. Present
      • All that pressure from subduction has been released. The continent is relaxing!
      • There might be residual upwelling at the spreading center, and now North America is right over top of it.
    • Weathering
      • Bedrock to regolith to soil
    • Endogenic vs. exogenic Internal vs. external systems plate tectonics folding faulting volcanism weathering water erosion wind erosion Building up Breaking down tug of war glacial erosion
    • Denudation
      • = wearing away of landforms
      • Involves
      • Weathering
      • Mass wasting
      • Erosion
      Agents: moving water, air, waves, ice
      • Weathering – breakdown of rock materials
      • Erosion – transport of broken-down materials
      Processes that weather/alter/destroy bedrock (P w ) versus Processes that expose bedrock (P e )
    • Yosemite, California P w < P e
    • P w > P e West Virginia
    • Champaign, France
    • Moab, Utah