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Music today: The Ventures, “Hawaii Five-O”. Reminder: 1st Midterm Exam next Wednesday (April 20) In class, closed book 70% multiple choice; 30% short essay Study Guide is up on website. Lecture 8: Hotspots, Plumes and LIPs ( L arge I gneous P rovinces).

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music today the ventures hawaii five o
Music today: The Ventures, “Hawaii Five-O”
  • Reminder: 1st Midterm Exam next Wednesday (April 20)
  • In class, closed book
  • 70% multiple choice; 30% short essay
  • Study Guide is up on website
lecture 8 hotspots plumes and lips l arge i gneous p rovinces

Lecture 8: Hotspots, Plumes and LIPs (Large Igneous Provinces)

Is Hawaii more than a good vacation spot?

How does life respond to catastrophes?

wilson cycle of ocean basin fm
Wilson Cycle (ofocean basin fm)
  • Examples:

1. East African Rifts

2. Red Sea

3. Atlantic Ocean

4. Pacific Ocean

5. Mediterranean Sea

6. Himalayas, Tibet

french polynesia from space
French Polynesia from space

atoll

fringing reef

barrier reef

questions
Questions:
  • Where do Hotspots come from?
  • How do Hotspots start?
  • How long do they last?
indian ocean
Indian Ocean
  • Hotspot tracks and 3 spreading ridges
  • A complete record of hotspot activity
western india
Western India
  • An accumulation of lava flows 3 miles thick!
  • Occurred at the same time as the dinosaurs’ extinction
mass extinction k t boundary
Mass Extinction(K-T Boundary)
  • What killed the Dinosaurs?
  • 65 million yr ago
  • A meteorite, or volcanic activity, or BOTH?
greenland
Greenland
  • Birth of the Iceland hotspot
  • Next came the opening of the North Atlantic Ocean basin
large igneous provinces are
Large Igneous Provinces are:
  • BIG!!
  • NOT explained by Plate Tectonics
  • Initial Plume and Hotspot Activity
a mantle plume
A Mantle Plume
  • A blob of warm material rising from the lower mantle
  • Solid but flowing at slow rate (<1 m/yr)
degassing magma
Degassing Magma
  • Gases include CO2, SO2, Cl, F that make “acid rain”
  • Shuts down photosynthesis
effects of submarine plateaus
Effects of Submarine Plateaus
  • Release of “reduced” metals uses up oxygen in the oceans
  • Trace metals are “nutrients”, so promote rapid growth of plankton
  • Sinking organic matter also uses up oxygen in the oceans
  • Extinctions of marine organisms
evolution of life
Evolution of Life
  • Where there is chaos there is opportunity
  • Extinctions lead to new ecosystems