Biotite-kaolinite transformation in a granitic saprolite of the Serre (Calabria, southern Italy)

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Authors:Mongelli, G.; Moresi, M.
Volume Title:Mineralogica et Petrographica Acta
Source:Mineralogica et Petrographica Acta, Vol.33, p.273-281. Publisher: Istituto di Mineralogia e Petrografia dell'Universita di Bologna, Bologna, Italy. ISSN: 0540-1437
Publication Date:1990
Note:In English. Based on Publisher-supplied data
Summary:The chemical and mineralogical variation caused by weathering of a granitic profile in the Serre area of Calabria was studied. The results obtained show that biotite transformed into vermiculite (unstable) and kaolinite. In the clay fraction of the saprolite, kaolinite is by far the most abundant phyllitic phase. The biotite- kaolinite transformation and the marked impoverishment of the many geochemical species (almost total in the case of CaO and Na2O) are typical of a more aggressive climate than the present one. If the erosion which accompanied the rapid lifting of the Serre is taken into consideration, it is very probable that the character of the profile was acquired in recent geological times, probably in an interglacial period with a hot humid climate. [J.M.H.]
Subjects:Alteration; Biotite; Chemical composition; Clay minerals; Granites; Humid environment; Igneous rocks; Interglacial environment; Kaolinite; Mica group; Plutonic rocks; Saprolite; Sheet silicates; Silicates; Terrestrial environment; Transformations; Vermiculite; Calabria Italy; Europe; Italy; Southern Europe; Serre Calabresi
Coordinates:N380000 N401000 E0170000 E0154500
Abstract Numbers:92M/2585
Record ID:2014026561
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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