(Fig. 12.20)

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(Fig. 12.20)
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(Fig. 12.21)
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(Fig. 12.23)
(Fig. 12.22)
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(Fig. 12.26)
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Very approximately 15 km/m.y. ( 1.5 cm/yr)
LA - SF 550 km. How long will it take LA to
reach SF?
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Tectonic Setting divergent ocean/ ocean ocean/ continent continent/continent transform
earthquakes (depth?) Very shallow Shallow to deep Shallow to deep more deep than shallow Shallow to moderate
volcanism (what kind?) Basalt flows Mafic small volcanoes Cascade Range, Andes, Japan None (VERY rare) None (VERY rare)
metamorphism (what conditions?) hydrothermal low T high P High T/low P, mod T/mod P High P and T Very minor
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Which location indicated on the map is a plate
boundary where oceanic lithosphere is currently
being subducted?
A B C D
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Where would you expect to find the oldest oceanic
lithosphere on a plate?

1. At the mid-ocean ridge
2. At the divergent plate boundary
3. Near the continent
4. Near a transform fault

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What kind of boundary is the lithosphereasthenosp
here boundary?

1. A temperature boundary
2. A compositional boundary
3. A mineralogic boundary