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Geotectonic significance of the metabasites of the Kinzigitic Series, Ivrea-Verbano zone (Western Italian Alps)

Geotektonische Bedeutung der Metabasite in den Kinzigiten der Ivrea-Verbano Zone (Italienische West-Alpen)

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Summary

Geochemical investigations have been carried out on the metabasites of the Ivrea-Verbano Zone (NW-Italy). The Ivrea-Verbano Zone is commonly considered to be a section through the lower continental crust. It is constituted by a steeply dipping sequence of metamorphic rocks (Kinzigitic Series), intruded by a mafic-ultramafic complex.

The metabasites of the Kinzigitic Series have a meta-igneous origin. Their protoliths show tholeiitic affinity in the NW and central part of the zone and alkalic affinity in the SE. This fact together with the rock associations suggests that a variation of the paleogeographic environment from NW to SE occurs in the Ivrea-Verbano Zone.

Zusammenfassung

Die Ivrea-Verbano-Zone wird im allgerneinen der unteren kontinentalen Kruste zugeordnet. Es handelt sich dabei um eine sehr steil stehende metamorphe Serie (Kinzigit-Serie), die von elnem mafischen-ultramafischen Komplex intrudiert wurde.

Die geochemischen Untersuchungen der in der Kinzigit-Serie vorkommenden Metabasite zeigen einen tholeiitischen Chemismus im nordwestlichen und im zentralen Bereich und einen alkalinen im südöstlichen Bereich.

Die chemische Entwicklung dieser Magmatite im Zusammenhang mit den unterschiedlichen Nebengesteinen weisen auf eine deutliche Änderung des paläogeographischen Milieus in der Ivrea-Verbano-Zone von Nordwesten nach Südosten hin.

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  1. M. Mazzucchelli &  F. Siena

    Present address: Istituto di Mineralogia, Università di Ferrara, c.so E. I d'Este, 32, I-44100, Ferrara, Italy

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    Mazzucchelli, M., Siena, F. Geotectonic significance of the metabasites of the Kinzigitic Series, Ivrea-Verbano zone (Western Italian Alps). TMPM Tschermaks Petr. Mitt. 35, 99–116 (1986). https://doi.org/10.1007/BF01140842

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