Mafic-plutonic sand, Antofagasta, Chile
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Sample area |
Macro |
Location |
North Chile, end of road along coast approx. 10 km south of Antofagasta |
Depositional facies |
Coast |
Provenance |
Gabbroid rocks on western slope of the Cerro Coloso |
Composition |
White plagioclase, black hornblende, absence of quartz |
Texture |
Coarse sand, poorly sorted, almost not transported detritus |
Petrographic thin section:
Description |
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Dark field |
Sample number |
heubeck0128 - SA16 |
Collector |
Christoph Heubeck, Institut für Geologische Wissenschaften, FU Berlin |
Date of sampling |
2005 |
Comments:
The Cerro Coloso is a "core complex" of mafic, plutonic rocks. They are found at > 1000 m on top of the cliff. The slope is described as an "angle of repose" and is covered by salt incrusted gravel and dune sands
