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Fe-Ti-Oxide assemblages in the basal parts of the Central Alpine Brenner Mesozoic, Tyrol/Austria

Fe- Ti-Oxid-paragenesen an der basis des Brennermesozoikums, Tirol/Österreich

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Summary

Pseudorutile in the cores of strongly zoned ilmenite aggregates surrounded by titanhematite and rutile occurs in a metamorphic paleoweathering horizon locally covering the Austroalpine Oetztal-Stubai crystalline complex. Pseudorutile is believed to develop during early diagenetic alteration of ilmenite due to the incursion of marine groundwater. The accompanying Fe-Ti-oxide assemblages (magnetite, rutile, ilmenite, hematite) are subdivided into allothigenic, authigenic, diagenetic and metamorphic formations. The overlying clastic sediments (Upper Scythian) contain enrichments of magnetite which are interpreted as marine beach placers with reworked material of the paleoweathering horizon.

Zusammenfassung

In einer das ostalpine Ötztal-Stubaikristallin lokal bedeckenden metamorphen Verwitterungszone wurde Pseudorutil im Kern von zonierten Ilmenit-Aggregaten nachgewiesen, die von einem Saum aus Ilmenithämatit und Rutil umgeben werden. Pseudorutil entstand wahrscheinlich durch eine frühdiagenetische Umwandlung von Ilmenit im Einflußbereich mariner Grundwässer. Die begleitenden Fe-Ti-Oxidparagenesen (Magnetit, Rutil, Ilmenit, Hämatit) wurden in allothigene, authigene, diagenetische und metamorphe Bildungen untergliedert. Magnetit-Anreicherungen in den überlagernden klastischen Sedimenten des Oberskyth können größtenteils als marine Strandseifenablagerungen durch Aufarbeitung von Material des Verwitterungshorizontes interpretiert werden.

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Author notes

  1. F. Melcher

    Present address: Institute of Geological Sciences, Mining University, A-8700, Leoben, Austria

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  1. Institut für Mineralogie und Petrographie, Universität Innsbruck, Austria

    F. Melcher

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Melcher, F. Fe-Ti-Oxide assemblages in the basal parts of the Central Alpine Brenner Mesozoic, Tyrol/Austria. Mineralogy and Petrology 44, 197–212 (1991). https://doi.org/10.1007/BF01166963

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  • DOI: https://doi.org/10.1007/BF01166963

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