Chavrit, D.

Droop, G.T.R.

Swiss Journal of Geosciences

Epidote-rich eclogitic metagabbro forms a small body within the Lanzada Window, upper Val Malenco, where it is associated with serpentinites and supracrustal rocks of the Lanzada Ã¢Â€Â“ Santa Anna Zone (LSZ), which lies structurally beneath the Malenco unit. Conventional garnetÃ¢Â€Â“clinopyroxene geothermometry and garnetÃ¢Â€Â“clinopyroxeneÃ¢Â€Â“phengite geobarometry indicate that the peak-metamorphic mineral assemblage (garnet + omphacite + epidote + phengite + titanite + apatite + pyrite) equilibrated at ca. 2.0 GPa and 525 Ã‚Â°C. The bulk composition is Ca-rich (wollastonite-normative), suggesting that the rock underwent Ca-metasomatism prior to high-P metamorphism. The presence of eclogite within the LSZ strengthens the correlation of the LSZ with the blueschist-bearing Avers BÃƒÂ¼ndnerschiefer, and confirms the former existence of a southerly-dipping subduction zone beneath the Malenco unit

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English

Eclogitic metagabbro from the Lanzada Window, eastern Central Alps: confirmation of subduction beneath the Malenco Unit.

Giles T. R. Droop

Déborah Chavrit

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Eclogitic metagabbro from the Lanzada Window, eastern Central Alps: confirmation of subduction beneath the Malenco Unit

Eclogitic metagabbro from the Lanzada Window, eastern Central Alps: confirmation of subduction beneath the Malenco Unit.

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The University of Manchester - Institutional Repository

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