Volcanic litharenit, 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)
Glass bead is 200μ
Petrographic thin section:
|
|
---|---|
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