Seitenhistorie

h5. Glauconite Sand, offshore Chile

| !scenery_box_corer.png|thumbnail! | | !0025_makro.png|thumbnail! |
| Box corer in use \\
{table-cell:width=30%} 
{table-cell} | 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 |
h6. 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. 
Digested and excreted phosphatic components from the fecal pellets diffused outwards and precipitated at the contact with the seawater as Fe-phosphate |

| !BF.png|thumbnail! | | !DF.png|thumbnail! |
| Bright field \\
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{table-cell} | Dark field |

| *Sample number* | heubeck0025 |
| *Collector* | Christoph Heubeck, Institut für Geologische Wissenschaften, FU Berlin | 
| *Date of sampling* | Dec. 2001 |

h6. Comments:

This is not really a natural sand because the grains were concentrated by washing and sieving from a muddy box corer sample

[Additional data page|geowisssand:0025 Additional data]