Glauconite Sand, offshore Chile
|
|
|
Box corer in use | Macro |
Location | 200 km offshore Concepcion, south central Chile, outer shelf, ca. 160 m water depth |
Depositional facies | Outer shelf, ca. 160 km water depth |
Provenance | Glauconitic fecal pellets (peloids) |
Composition | Mainly glauconite, some phosphate |
Texture | Well sorted, well rounded coarse-grained pellets. This is not really a natural sand because the grains were concentrated by washing and sieving from a muddy box corer sample |
Petrographic thin section:
Description | Glauconitic fecal pellets with a phosphatic rind. The bottle-green color and the granular texture is a strong indicator for glauconite; the pleochroic wood-brown rind indicates the presence of phosphate. |
|
|
|
Bright field | Dark field |
Sample number | heubeck0025 |
Collector | Christoph Heubeck, Institut für Geologische Wissenschaften, FU Berlin |
Date of sampling | Dec. 2001 |
Comments:
This is not really a natural sand because the grains were concentrated by washing and sieving from a muddy box corer sample