Metasomatic and non-metasomatic low grade metamorphism of Ordovician meta-bentonites in Sweden

Details Metasomatic and non-metasomatic low grade metamorphism of Ordovician meta-bentonites in Sweden Metasomatic and non-metasomatic low grade metamorphism of Ordovician meta-bentonites in Sweden

Mar 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982gecoa..46..447v&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 46, Issue 3, pp.447-452

Physics

Scientific paper

Bulk rock and electron microprobe analyses of two series of meta-bentonite beds one of which was subjected to low grade metamorphic conditions indicate that: 1. (a) K is the most important element in the metasomatic transformation of volcanic ash into bentonite clay mineral assemblages. Al content of the ash beds is closely related to K content 2. (b) Low grade metamorphism of such bentonites does not greatly influence the major element chemistry of the beds 3. (c) Low grade metamorphism does affect Rb-Sr abundances in the beds indicating that while major elements are more or less isochemical during the process of recrystallization, minor elements can behave as mobile elements.

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