Volcanic
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litharenite, Conaripe, Chile
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Lago Calafquen | Foamy obsidian, glass bead is 200μ |
Location |
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Conaripe, Lago Calafquen, South Chile | |
Depositional facies |
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Provenance:
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low energetic beach of a former glacier lake | |
Provenance | Volcanic lava |
Composition |
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Green and black obsidian, with embedded clinopyroxene and plagioclase; andesitic mikrolithes, |
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ignimbrite; |
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PRF's: plagioclase, ortho-/ |
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clinopyroxene ( |
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gabbro); monocrystalline quartz; |
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SRF: |
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aragonite ( |
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ooid) |
Texture |
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Immature, poorly sorted, poorly rounded (angular), light grey to black, hyaline and dull surfaces, |
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medium to coarse sand (250 |
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to 1250 μm) |
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Sample Number:
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Petrographic thin section:
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Description | insert here short description of thin section |
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Bright field | Dark field |
Sample number | heubeck0097 |
Collector |
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Christoph Heubeck, Institut für Geologische Wissenschaften, |
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FU Berlin |
Date |
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of sampling | January 2005 |
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Comments:
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Composition is similar to Black Sand Beach (, Hawaii), but with less obsidian and additonal PRF's
