Abstract
Coexisting Ca-amphiboles, biotites, apatites, and sphenes were analysed for fluorine by a micro-probe. Fifty samples from four areas were examined. The distribution coefficient K A-BD(F) for coexisting Ca-amphibole and biotite varies between 0.5 and 1.1 and is positively correlated with increasing metamorphic grade and with increasing contents of Ti in Ca-amphibole. Samples carrying hematite have normally a higher content of fluorine in the hydrous minerals due to an increasing activity of fluorine during the oxidation. It is shown that apatite mirrors a low activity of fluorine better than coexisting biotite, which in turn is a more sensitive indicator at higher F-activities. The distribution of fluorine between sphene and biotite is also discussed.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Annersten, H.: A mineral chemical study of a metamorphosed iron formation in northern Sweden. Lithos 1, 374–397 (1968).
Annersten, H., Ekström, T.: Distribution of major and minor elements in coexisting minerals from a metamorphosed iron formation. Lithos 4, 185–204 (1971).
Ekström, T.: Elementfördelningen i samexisterande aktinolit, biotit och magnetit från Kiirunavaara-Luossavaara. Ph.D. thesis, Dept. of Geology, Uppsala University (1967).
Ekström, T.: Coexisting scapolite and plagioclase from two iron formations in northern Sweden. Lithos (in press).
Evans, B. W.: Chlorine and fluorine in micas of pelitic schists from the sillimanite-orthoclase isograd, Maine. Am. Mineralogist 54, 1209–1211 (1969).
Gillberg, M.: Halogens and hydroxyl contents of micas and amphiboles in Swedish granitic rocks. Geochim. et Cosmochim. Acta 28, 495–516 (1964).
Gorbatschev, R.: Distribution of tetrahedral Al and Si in coexisting biotite and Ca-amphibole. Contr. Mineral. and Petrol. 28, 251–258 (1970).
Kretz, R.: The distribution of certain elements among coexisting calcic pyroxenes, calcic amphiboles, and biotites in skarns. Geochem. et Cosmochim. Acta 20, 161–191 (1960).
Munoz, J. L., Eugster, H. P.: Experimental control of fluorine reactions in hydrothermal systems. Am. Mineralogist 54, 943–959 (1969).
Noda, T., Ushio, T.: Hydrothermal synthesis of fluorme-hydroxyl phlogopite: II. Relationship between the fluorine content, lattice constants, and the conditions of synthesis of fluorine-hydroxyl phlogopite. Geochem. Int. 1, 96–104 (1964).
Ramberg, H.: Chemical bonds and the distribution of cations in silicates. J. Geol. 60, 331–355 (1952).
Stormer, J. C., Carmichael, I. S. E.: Fluorine-hydroxyl exchange in apatite and biotite: A potential geothermometer. Contr. Mineral. and Petrol. 31, 121–131 (1971).
Wones, D. R., Eugster, H. P.: Stability of biotite: Experiment, theory and application. Am. Mineralogist 50, 1228–1272 (1965).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Ekström, T.K. The distribution of fluorine among some coexisting minerals. Contr. Mineral. and Petrol. 34, 192–200 (1972). https://doi.org/10.1007/BF00373291
Received:
Issue date:
DOI: https://doi.org/10.1007/BF00373291
