Liz Johnson, James Madison University

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Presentation transcript:

Liz Johnson, James Madison University (johns2ea@jmu.edu) Composition and Structure of Earth through Hand Samples and Thin Sections Liz Johnson, James Madison University (johns2ea@jmu.edu)

Take a Field Trip?

Motivation for sample-based exercise Lack of retention of information about Earth’s interior Classification of ultramafic rocks New topics: mineralogy or textures of meteorites, mantle, core Introduction to the concept of MASS BALANCE (lecture)

How much detail? From Winter, Intro to Igneous and Metamorphic Petrology

How much detail? Frost, Elements 2008

Lab for Introduction to Petrology

This activity could be used in… Igneous and Metamorphic Petrology Earth Materials Mineralogy Introductory and general education courses Only hand samples / choose mantle or meteorites

Classification of ultramafic rocks Figure 2.2c. A classification of the phaneritic igneous rocks: Ultramafic rocks. After IUGS. From Winter (2001)

Obtaining Meteorite Samples Hand Samples and Thin Sections: http://www.impactika.com/center.htm Ebay? Thin section images http://web.pdx.edu/~ruzickaa/meteorites/gallery/gallery.html Other Sources:

Obtaining Mantle Samples Purchase samples from well-known localities like San Carlos? Wards or mineral dealers. Sample exchange between universities? I’d like to acquire some experimental runs or diamond inclusions – something to represent lower mantle. http://all-geo.org/highlyallochthonous/