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Chapter 3: Igneous Rocks, Intrusive Activity, and the Origin of Igneous Rocks

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Expanding Your Knowledge

Chapter 3: Igneous Rocks, Intrusive Activity, and the Origin of Igneous Rocks

  1. In parts of major mountain belts there are sequences of rocks that geologists interpret as slices of ancient oceanic lithosphere. Assuming that such a sequence formed at a divergent boundary and was moved toward a convergent boundary by plate motion, what rock types would you expect to make up this sequence, going from the top downward?


  2. What would happen, according to Bowen's reaction series, under the following circumstances: olivine crystals form and only the surface of each crystal reacts with the melt to form a coating of pyroxene that prevents the interior of olivine from reacting with the melt?

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