Volcanic litharenite, Conaripe, 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) |
Petrographic thin section:
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 |
Comments:
Composition is similar to Black Sand Beach, Hawaii, but with less obsidian and additonal PRF's
