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Glauconite Sand, offshore Chile

 

Box corer in use

Unknown macro: {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

Petrographic thin section:

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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

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Bright field

 

Dark field

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

Comments:

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

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