Interpretation and Petrogenesis of Zoned Plagioclase

R. K. Smith
,
The University of Texas at San Antonio


Summary

The purpose of this exercise is to give students the experience of utilizing the two component solid solution phase diagram of albite-anorthite and applying this diagram to the interpretation and petrogenesis of chemically zoned plagioclase.

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Context

Audience

This exercise is designed for a sophomore or junior level petrology course that is required for majors.

Skills and concepts that students must have mastered

Students should know how to interpret a phase diagram.

How the activity is situated in the course

This is a stand-alone exercise.

Goals

Content/concepts goals for this activity

This activity is designed to improve students' understanding of phase diagrams and zoning in minerals.

Higher order thinking skills goals for this activity

This activity involves critical thinking, synthesis of ideas, and data analysis.

Other skills goals for this activity

This activity involves group work.

Description of the activity/assignment

The purpose of this exercise is to give students the experience of utilizing the two component solid solution phase diagram of albite-anorthite and applying this diagram to the interpretation and petrogenesis of chemically zoned plagioclase.

Determining whether students have met the goals

Students have successfully completed this exercise if they completely and accurately answer the questions and follow instructions given in the exercise handout.

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