Mafic-plutonic sand, Antofagasta, Chile
|
|
|
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 | insert here short description of thin section |
insert here a bright field image |
| insert here a dark field image |
Bright field | 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