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Volcanic
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litharenite,
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Conaripe,
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Chile
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Lago Calafquen | Foamy obsidian, glass bead is 200μ |
Location | Conaripe, Lago Calafquen, South Chile |
Depositional facies | low energetic beach of a former glacier lake |
Provenance | Volcanic lava |
Composition | Green and black obsidian, with embedded clinopyroxene and plagioclase; andesitic mikrolithes, ignimbrite; PRF's: plagioclase, ortho-/clinopyroxene (gabbro); monocrystalline quartz; SRF: aragonite (ooid) |
Texture | Immature, poorly sorted, poorly rounded (angular), light grey to black, hyaline and dull surfaces, medium to coarse sand (250 to 1250 μm) |
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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 | Christoph Heubeck, Institut für Geologische Wissenschaften, FU Berlin |
Date 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