Glauconite Sand, offshore Chile
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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. |
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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