1330 Assignment 2 Printout (1) (1)

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University of Houston *

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1303

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Geology

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Apr 3, 2024

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Physical Geology Assignment 2: Igneous Rocks Note the classification charts on the last two pages that follow the table of minerals below. Using the charts, provide the appropriate information in the spaces that are color-coded yellow. Igneous Rock Name Composition (felsic, intermediate, mafic, ultramafic) Minerals Texture (aphanitic, porphyritic, phaneritic, glassy, vesicular, pyroclastic) Image Sample #1. Rock name? Gabrro Mafic Plagioclase feldspar Pyroxene Olivine Phaneritic Sample #2. Rock name? Granite Felsic What are three obvious minerals? Quartz biotite potassium feldspar Phaneritic

1 Igneous Rock Name Composition (felsic, intermediate, mafic, ultramafic) Minerals Texture (aphanitic, porphyritic, phaneritic, glassy, vesicular, pyroclastic) Image Sample #3. Scoria Mafic No minerals Texture? vesicular Sample #4. Rock name? Obsidian Felsic intermediate No minerals Texture? Glassy

Sample #5. Rock name? Porphyritic Andesite Intermediate What are two major minerals? Plagioclase feldspar Amphibole Porphyritic 2 Igneous Rock Name Composition (felsic, intermediate, mafic, ultramafic) Minerals Texture (aphanitic, porphyritic, phaneritic, glassy, vesicular, pyroclastic) Image Sample #6. Rock name? Volcanic breccia Felsic Volcanic fragments > 4mm in diameter Texture? Pyroclastic

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Sample #7. Rock name? basalt Mafic What are three main minerals? Plagioclase feldspar - pyroxene - olivine Aphanitic Sample #8. Rhyolite Composition? felsic Orthoclase feldspar Quartz Biotite Texture? Aphantic 3 Igneous Rock Name Composition (felsic, intermediate, mafic, ultramafic) Minerals Texture (aphanitic, porphyritic, phaneritic, glassy, vesicular, pyroclastic) Image

Sample #9. Rock name? Pumice Felsic No minerals Texture? vesicular Sample #10. Rock name? pophyritic basalt Mafic The white phenocrysts are what mineral? Plagioclase feldspar Texture? Pophyritic Sample #11. Peridotite Composition? Ultramafic Two mafic minerals? Olivine pyroxene Texture? Phaneritic 4

Igneous Rock Name Composition (felsic, intermediate, mafic, ultramafic) Minerals Texture (aphanitic, porphyritic, phaneritic, glassy, vesicular, pyroclastic) Image Sample #12. Diorite Composition? Intermediate Plagioclase feldspar Amphibole Texture? Phaneritic Match the following sample numbers provided above with the corresponding geologic environment

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Sample #2 Location C Sample #5 E Sample #7 A Sample #11 B Sample #12 D Location A Location B Location C Location D Location E E D A C B 5 Classification Charts

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1330 Assignment 2 Printout (1) (1)

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