Abstract
The development of Fe-Ti oxide assemblages in basic rocks from the Penninic series of the southern Venediger rea, Austria, during polyphase Alpine metamorphism has been studied. Textural and compositional relations indicate thorough reequilibration of the opaque mineral assemblages during late Barrovian metamorphism at essentially static conditions of lower amphibolite to greenschist facies. In contrast, silicate mineralogy of the preceeding blueschist to eclogite facies metamorphism might still be preserved to a large extent.
Chemical adjustment of the Fe-Ti oxide minerals to decreasing P-T conditions is characterized by (1) formation of complex intergrowths of ilmenite and hematite solid solutions (<550° C), (2) the decomposition of hemo-ilmenite 1 to ferrianilmenite2+magnetite+rutile and of ilmeno-hematite1 to titanhematite2+rutile±magnetite (<450° C), and (3) low-grade oxidation of ferrianilmenite2 to magnetite+hematite-rutile intergrowths or hematite +rutile and of titanhematite2 to hematite-rutile intergrowths (≦400° C). Chemical equilibrium is suggested by the regular partitioning of Cr, V, Mg and Mn between coexisting hemo-ilmenite, ilmeno-hematite, and magnetite. The hematite-ilmenite miscibility gap has been delimited on the basis of the bulk compositions of the exsolved phases and the temperature estimates obtained from Fe-Ti oxide thermometry.
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Braun, E., Raith, M. Fe-Ti-oxides in metamorphic basites from the Eastern Alps, Austria: a contribution to the formation of solid solutions of natural Fe-Ti-oxide assemblages. Contr. Mineral. and Petrol. 90, 199–213 (1985). https://doi.org/10.1007/BF00378261
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DOI: https://doi.org/10.1007/BF00378261