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Mineralogical and genetical aspects of the Smålands Taberg Fe-Ti-V ore, Protogine Zone of southern Sweden

Abstract The Fe-Ti-V deposit in Smålands Taberg is ca. 1200 Ma in age and composed of olivine, titanomagnetite, and minor plagioclase cumulates. The ore is massive in hand specimens, however, weak foliation caused by orientation of tabular plagioclase laths indicates magmatic lamination or a crystallization process characteristic for layered intrusions. More than 500 microprobe analyses of cumulates from profiles normal to the igneous lamination in the plagioclase-poor part of the ore reveal compositional uniformity of olivine (Fo70), and plagioclase (An58). On the other hand, titanomagnetite which is the only primary Fe-Ti oxide in the ore shows a variety of exsolution modifications but no compositional cryptic variation among the compatible elements Fe, Ti, Al, Mg, Mn, and V. It is assumed that the cumulates of the Smålands Taberg are products of density-controlled, early crystallization of basaltic magma. The displacements and fractures within the primary ore body as well as oxidation and exsolution processes are discussed in the context of the formation of both the Protogine Zone and the Vättern rift.