Halogens and hydroxyl contents of micas and amphiboles in Swedish granitic rocks

Details Halogens and hydroxyl contents of micas and amphiboles in Swedish granitic rocks Halogens and hydroxyl contents of micas and amphiboles in Swedish granitic rocks

Apr 1964

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1964gecoa..28..495g&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 28, Issue 4, pp.495-516

Physics

7

Scientific paper

The chlorine, fluorine and hydroxyl contents of micas and some coexisting amphiboles in 34 Swedish granitic rocks and in six pegmatites have been determined by neutron activation, titration and a modified Penfield analysis respectively. The halogens were liberated from the minerals by pyrohydrolysis. The analysed minerals were isolated with a mechanical pan, Superpanner, and a magnetic separator. The pegmatitic micas show a high content of fluorine, whereas the chlorine content is low with two exceptions. The biotite when coexisting with a muscovite contains more fluorine than the latter. An amphibole and a coexisting biotite have fluorine and chlorine contents of the same magnitude. In two samples surplus water was observed in both the coexisting minerals. The biotites in granites show a large variation in fluorine and chlorine contents. The highest values found are 0.88 per cent fluorine and 0.66 per cent chlorine for a biotite in a granite. The results have been discussed, grouping the material according to age and to some petrographic parameters, but no generally valid relationships could be established. It appears, however, that the content and distribution of volatiles are affected by the tectonic and chemical history of a petrographic province.

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