Volcanic
...
litharenite, Conaripe, Chile
...
|
|
|
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 |
|
Foamy obsidian, 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, |
...
medium to coarse sand (250 |
...
to 1250 μm) |
...
Sample Number:
...
Petrographic thin section:
...
Description | insert here short description of thin section |
|
|
|
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