Today –Hot Spots –Past Plate Motions –Review TEST 1 –LAB: Describing Minerals Wednesday –TEST 1 –Chemistry of Minerals –READ Chapter 5 Next Monday –Rock Forming Minerals –LAB Identifying Minerals

Hot Spots

Global Distribution of Active Volcanoes Source:

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04_23a.jpg animation

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Past Plate Positions

Dating the Sea Floor (Fig. 4.11) animation

Magnetometer Fig 3.24a

Magnetic Field Strength near PNW Coast Fig 3.24b

Magnetic Field Strength Portland Source:

Magnetism of a Lava Flow Sequence (Fig 3.25)

Magnetic Field Flips Fig. 3.26

Magnetic Reversal Time Line (Fig 3.27)

Geomagnetic Timescale Fig. 3.30c

Cause of Reversals? Fig

Fig 3.28 animation

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Dating the Sea Floor (Fig. 4.11) animation

04_33.jpg Animation of Continental Drift

Cause of Plate Tectonics? Fig. 4.32

Convection in Mantle Fig. 4.28

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Ridge Push and/or Trench Pull Fig. 4.29

Super Continent Cycle?

West Coast Tectonics Fig 4.19

PNW Earthquakes & Plates

3-D view:

Evidence for Past Subduction Zone Earthquakes?

What happens during subduction zone earthquake? Locking and Bulging GPS: ½ in/year Rebound uplift subsidence

Ghost Forest

And deposition by tsunami Coastal evidence of subduction zone earthquakes

Peat Layer topped by Tsunami Sand-Oregon

Orphan Tsunami in Japan Jan 29, 1700

Last Subduction Zone Earthquakes January 26th 1700 Coast Line from Vancouver Island to Northern California subsided approx. 6ft. M9! (100 times Nisqually earthquake)

How frequent? One every years. Last one 300 y. a.

TEST 1 Chapters 2, 3, 4, prelude, interlude A & E

Minerals Crystals Grains in Rocks

Quartz Fig. 5.15

Metallic vs. Non-Metallic Luster Fig. 5.17

Streak Fig. 5.16

Table 5.1

Cleavage Fig. 5.19

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Crystal Shapes Fig 5.5

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Conchoidal Fracture Fig. 5.20

Fizz Test (Fig. 5.22)

For Wednesday 1/21 TEST 1 –Chapters 2, 3, 4, –prelude, interlude A & E – Reading-Chapter 5 Minerals