Metamorphism and deformation at the northwest margin of the Ivrea zone, Val Loana (N. Italy).

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Abstract

The NW margin of the Ivrea zone is affected by three main deformational events, from the S end of Val Loana: 1) pre-Alpine deformation under conditions of upper amphibolite facies; 2) also pre-Alpine, but with continuously decreasing T from amphibolite to greenschist facies, indicating a continuous shear movement presumably related to upward thrusting of the Ivrea zone; and 3) pre-Alpine to Alpine deformation under very low-grade metamorphism causing a large isoclinal fold: the continuation of the Finero antiform. The Insubric line, the southern boundary of Alpine deformation and metamorphism at the S end of Val Loana, represents the S boundary of a broad mylonite zone related to the first Alpine deformation. Here, the Alpine deformation and upper greenschist-facies metamorphism began overprinting the pre-Alpine rocks. A third Alpine deformation event affected the mylonite of the Insubric line and produced distinct shear planes within the Ivrea rocks further SE.-W.S.

Original languageEnglish
Pages (from-to)151-167
Number of pages17
JournalSchweizerische Mineralogische und Petrographische Mitteilungen
Volume64
Issue number1-2
StatePublished - 1984
Externally publishedYes

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