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Weathering products of andesitic rocks from Sulawesi, Indonesia

Published online by Cambridge University Press:  09 July 2018

H. W. Müller
Affiliation:
Institut für Bodenforschung und Baugeologie, Universität für Bodenkultur Wien
G. Riedmüller
Affiliation:
Institut für Technische Geologie, Petrographie und Mineralogie, Technische Universität Graz, Österreich
B. Schwaighofer
Affiliation:
Institut für Bodenforschung und Baugeologie, Universität für Bodenkultur Wien

Abstract

Mineralogical investigations of weathered andesitic bedrock and overburden on the valley flank of the Tondano river, Manado, Sulawesi, indicated that these had been subjected to different weathering conditions. The underlying andesite was completely altered to 7Å-halloysite and allophane. In the transported latosols of the overburden, 10Å- and 7Å-halloysites were found. The ratio of 10Å- to 7Å-halloysite increased linearly with depth in the profile. It is considered that weathering of the andesitic bedrock reflects a palaeoclimate with more strongly pronounced seasonal desiccation and lower annual rainfall. Neoformations by weathering of the overburden took place under the recent tropical climate.

Type
Research Article
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1984

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