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Sp09_101_Prelab3 - mafic felsic(e is likely to form at a...

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Name: Geology 101 – Prelab Assignment Lab 3 – Igneous Rocks Due: Tuesday, April 14 Instructions: After completing the assigned lab readings complete the following prelab assignment before coming to lab. Assignments will not be accepted after the beginning of class on the due date. Readings: Review the background materials for Lab 3 in the lab manual (p. 29-38). In addition, read through the section of Chapter 3 in your textbook on Igneous Rocks. Questions: (1) Determine whether the following statements describe a rock with a mafic or felsic composition (circle one for each). (a) has a higher silica content: mafic / felsic (b) is darker colored mafic / felsic (c) is lighter weight mafic / felsic (d) is likely to contain olivine
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Unformatted text preview: mafic / felsic (e) is likely to form at a divergent plate boundary mafic / felsic (2) List the three silicate minerals that form first (at the highest temperature) on Bowen’s Reaction Series. (3) Which of the following textures could be associated with a “volcanic” rock. (Circle any that apply.) fine grained / coarse grained / vesicular / fragmental (4) Practice using the ID charts on page 34 to identify the 3 igneous rocks described below. (a) Rock Name: _________________ Description: mafic composition, fine grained texture (b) Rock Name: _________________ Description: felsic composition, vesicular texture (c) Rock Name: _________________ Description: intermediate composition, coarse texture...
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