Seitenhistorie

h5. Glauconite Sand, offshore Chile

| !scenery_box_corer_1400.jpgpng|thumbnail! | | !0025_makro_1000.jpgpng|thumbnail! |
| Box corer in use \\
{table-cell:width=30%} 
{table-cell} | Macro |

h6. Location:

200 km offshore Concepcion, south central Chile, outer shelf, ca. 160 m water depth

h6. Depositional facies:

Outer shelf, ca. 160 km water depth

h6. Provenance:

Glauconitic fecal pellets (peloids)

h6. Composition:

Mainly glauconite, some phosphate

h6. Petrographic thin section:

| !0025_th_s_II_1700.jpg|thumbnail! | 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 \\ | !0025-th-s-X_1500.jpg|thumbnail! |
| Bright field \\ | | Dark field \\ |

h6. 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
|| Sample number \\ || Collector || Date of sampling \\ ||
| heubeck0025 | Christoph Heubeck, Institut für Geologische Wissenschaften, FU Berlin | dec. 2001 |

h6.


h6. Comments:

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