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Journal of the Geological Society; 2006; v. 163; issue.4; p. 641-646;
DOI: 10.1144/0016-764920-035
© 2006 Geological Society of London

Original Article

Fate of calcite, apatite and feldspars in an ombrotrophic peat bog, Black Forest, Germany

Gaël Le Roux1,2, Emmanuel Laverret1 & William Shotyk1

1 1Institut für Umwelt Geochemie, Im Neuenheimer Feld 234–236, 69120 Heidelberg, Germany
2 2Present address: IRSN, Cadarache, 13115 St. Paul lez Durance, France (e-mail: gael.le-roux@wanadoo.fr)

The distribution of primary minerals in a peat profile was investigated in a dated core (210Pb, 14C) taken from the upper part of an ombrotrophic bog. Using XRD, the most abundant minerals present in the peat were those of the local granite, suggesting that the dust entering the bog is mainly of local origin. Apatite and calcite are restricted to the top 8 cm of the profile, which suggests rapid dissolution. The release of P by apatite dissolution is possibly the main source of plant-available P to the oligotrophic waters. In contrast, quartz and feldspars appear to be preserved for thousands of years despite the low pH and abundance of organic acids. This study suggests that ombrotrophic peat bogs could be valuable archives of aluminosilicate deposition since the Late Glacial.




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