Volcanic litharenite, Conaripe, Chile
Location:
Conaripe, Lago Calafquen, South Chile; low energetic beach of a former glacier lake
Provenance:
Volcanic lava
Composition:
Green and black obsidian, with embedded clinopyroxene and plagioclase; andesitic mikrolithes, ignimbrit; PRF's: plagioclase, ortho-/clinoyroxene (Gabbro); monocrystalline quartz; SRF: Aragonit (Ooid)
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Foamy obsidian, glass bead is 200μ |
Petrographic thin section:
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Bright field |
Dark Field |
Texture:
Immature, poorly sorted, poorly rounded (angular), light grey to black, hyaline and dull surfaces,
middle to coarse sand (250 bis 1250 μm)
Sample Number:
heubeck0097
Collector:
Christoph Heubeck, Institut für Geologische Wissenschaften, Freie Universität Berlin
Date:
January 2005
Comments:
Composition is similar to Black Sand Beach (Hawaii), but with less obsidian and additonal PRF's
