Nature and Origin of an Aluminous Vermiculitic Weathering Product in Acid Soils from Upland Catchments in Scotland

Bain, Derek C., Mellor, Antony and Wilson, Matthew (1990) Nature and Origin of an Aluminous Vermiculitic Weathering Product in Acid Soils from Upland Catchments in Scotland. Clay Minerals, 25 (4). pp. 467-475. ISSN 0009-8558

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Abstract

Vermiculitization of mica is one of the main weathering processes in soils from three upland catchments receiving various levels of acid deposition. This process is manifested by the presence of interstratified mica-vermiculite with the interlayer space in the vermiculite partially filled with polymeric hydroxyaluminium species. In one peaty podzol, regularly interstratified mica-vermiculite developed at the expense of mica and was the dominant mineral in the Eh horizon. It was concentrated by chemical treatments to remove organic matter, free iron oxides, and many Al species in the interlayer, and the structural formula calculated from chemical analysis confirmed the dioctahedral character of both vermiculite and mica components, and indicated that the vermiculite weathering product was formed from a dioctahedral mica. The degree of interlayering in the interstratified phases seemed to be pH-dependent with resultant implications for soil and freshwater acidification.

Item Type:	Article
Subjects:	F800 Physical and Terrestrial Geographical and Environmental Sciences
Department:	Faculties > Engineering and Environment > Geography and Environmental Sciences
Depositing User:	Becky Skoyles
Date Deposited:	09 Jul 2014 09:07
Last Modified:	13 Oct 2019 00:22
URI:	http://nrl.northumbria.ac.uk/id/eprint/17010

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