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Título

Morphological and Chemical Features of Bioweathered Granitic Biotite Induced by Lichen Activity

AutorAscaso, Carmen ; Wierzchos, Jacek
Palabras claveAspicilia intermutans
Biotic
Bioweathering
Granite
Lichens
Parmelia conspersa
Fecha de publicación1996
EditorClay Minerals Society
CitaciónClays and Clay Minerals 44 (5): 652-657 (1996)
ResumenTo study the Physico-chemical activity of lichens on micaceous components of granitic rocks, samples covered by thalli pf Parmelia conspersa (Ehrht) Ach. and Aspicilia intermutans (Nyl.) arn.were collected and examined with Scanning Electron Microscopy (SEM) equipped with a Back Scattered Electron (BSE) detector and a Energy Dispersive Spectroscopy (EDS) microanalytical system. The biophysical activity of both lichen species leads to adeep alteration of biotite which results in detachment separation and exfoliation of biotite plates. Chemically the bioweathering process of biotite in the lichen mineral contact zone involves considerable depletion of potassium (k) from interlayer positions in biotite and removal of several elements, corresponding to a 9.7% loss in matter. The sequence of the loss of elements.
Descripción6 pages, figures, and tables statistics.
URIhttp://hdl.handle.net/10261/25418
ISSN0009-8604
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