extra credit option: attend the public lecture by prof. antonio lazcano on tuesday (tomorrow)...
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Location of Earth’s Hot-spots PLATETECTONICSPLATETECTONICSTRANSCRIPT
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Extra Credit Option:Extra Credit Option:
Attend the Public Lecture by Prof. Antonio Lazcano on Tuesday (tomorrow) evening, Feb 11 at 7:30 PM in Gammage Auditorium here on campus. Write up a short summary 2-3 paragraphs for the talk, highlighting the aspects you found most interesting. Bring your write-up to class on Wednesday. Be sure to write your name and ASU ID at the top of the page.
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Today’s Lecture:Today’s Lecture:
Plate margins and associated geological pheneomena.
- Intraplate hot-spots.- Divergent plate margins in continental
settings (origin of new ocean basins).- Convergent margins- Continental margin settings.- Transform margins (ridge transforms and
on-land transforms. Brief Review Quiz Next time: Interlude A and Chapter 5!
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Location of Earth’s Hot-spotsLocation of Earth’s Hot-spotsPLATEPLATETECTONICSTECTONICS
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Yellowstone Hot SpotYellowstone Hot SpotPLATEPLATETECTONICSTECTONICS
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Yellowstone Hot SpotYellowstone Hot SpotPLATEPLATETECTONICSTECTONICS
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Types of Plate BoundariesTypes of Plate BoundariesPLATEPLATETECTONICSTECTONICS
divergent boundaries
convergent boundaries
transform fault boundaries
3 types
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Continental Rifting: East AfricaContinental Rifting: East Africa PLATEPLATETECTONICSTECTONICS
Red Sea (looking southeast)
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PLATEPLATETECTONICSTECTONICS Opening of the Red Sea
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Opening of the Red SeaOpening of the Red SeaPLATEPLATETECTONICSTECTONICS
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Formation of Triple JunctionsFormation of Triple JunctionsPLATEPLATETECTONICSTECTONICS
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ocean-continent
ocean-ocean
continent-continent
3 Types of Convergent Plate Margins
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Types of Continental MarginsTypes of Continental Margins
“Active” Found along convergent
plate margins: Primarily around the Pacific rim. Characterized by active narrow continental shelves and active mountain building processes (earthquakes & volcanic activity). Accretionary wedges of sediment which are scraped off the top of a subducting slab.
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Types of Continental MarginsTypes of Continental Margins
“Passive” Found within plate interiors:
Continental margin not = a plate marginExamples are continental margins around Atlantic. Broad continental shelves consist of thick wedges of sediment deposited along margins Few earthquakes or volcanic eruptions.
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Comparison of Active and Passive Continental Margins
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Transform fault boundaries
Strike-slip faults where plates slide past each other: No production/destructionof material
Most connect mid-ocean ridge segments
Others are “on-land” transforms like the San Andreas Fault.
Transform Plate MarginsTransform Plate MarginsPLATEPLATETECTONICSTECTONICS
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Transform Plate MarginsTransform Plate MarginsPLATEPLATETECTONICSTECTONICS
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On-Land Transform Faults
San Francisco Peninsula and San Andreas Fault
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In-class exercise. Name:______________________GLG 101 Prof. Farmer ASU ID:________________
Compare the continental margin of the west coast of S. America with the east coast of N. America.
1) South Am.
2) North Am.
Questions:a) Active or passive continental margin?b) Draw a cross-section (a side view) of each area, labeling the most important features.