http://www.cnr.it/ontology/cnr/individuo/prodotto/ID210781
MULTI-SCALE APPROACH TO THE PERMIAN TECTONOMETAMORPHIC EVOLUTION OF THE DENT-BLANCHE UNIT (AUSTROALPINE DOMAIN, WESTERN ITALIAN ALPS) (Abstract/Poster in convegno)
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- MULTI-SCALE APPROACH TO THE PERMIAN TECTONOMETAMORPHIC EVOLUTION OF THE DENT-BLANCHE UNIT (AUSTROALPINE DOMAIN, WESTERN ITALIAN ALPS) (Abstract/Poster in convegno) (literal)
- Anno
- 2011-01-01T00:00:00+01:00 (literal)
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ZUCALI Michele1, MANZOTTI Paola2, DIELLA Valeria3, PESENTI Claudio1,
RISPLENDENTE Andrea1, DARLING James2, ENGI Martin2 (2011)
MULTI-SCALE APPROACH TO THE PERMIAN TECTONOMETAMORPHIC EVOLUTION OF THE DENT-BLANCHE UNIT (AUSTROALPINE DOMAIN, WESTERN ITALIAN ALPS)
in Geoitalia 2011, VIII forum italiano di Scienze della Terra, Torino, 19-23 settembre
(literal)
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- ZUCALI Michele1, MANZOTTI Paola2, DIELLA Valeria3, PESENTI Claudio1,
RISPLENDENTE Andrea1, DARLING James2, ENGI Martin2 (literal)
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- Geoitalia 2011, VIII forum italiano di Scienze della Terra, Torino (literal)
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- 1 - Dipartimento di Scienze della Terra \"Ardito Desio\", Università degli
Studi di Milano, via Mangiagalli 34, 20133 IT-Milano.
2 - University of Bern, Baltzerstrasse 3, CH-3012 Bern
3 - CNR-Istituto per la dinamica dei processi ambientali, Sezione di Milano,
via Botticelli 23, 2033 Milano. (literal)
- Titolo
- MULTI-SCALE APPROACH TO THE PERMIAN TECTONOMETAMORPHIC EVOLUTION OF THE DENT-BLANCHE UNIT (AUSTROALPINE DOMAIN, WESTERN ITALIAN ALPS) (literal)
- Abstract
- The Dent-Blanche Unit (Austroalpine domain, Western Italian Alps) is
constituted by Valpelline and Arolla units, respectively composed by
high-grade pre-Alpine basement rocks and Permian intrusive with
high-grade pre-Permian xenoliths. The main structural imprint of the
high-grade rocks is characterized by amphibolite to granulite facies
conditions, commonly associated with large melt-bearing parageneses.
During this melt-producing stage the meso- and microstructural evolution
is polyphase and produce decametric isoclinal locally rootless folds. The
multilayer is defined by alternate garnet-clinopyroxene bearing
amphibolite, marble and melt-bearing gneisses (i.e. migmatites). Locally
metre-scale orthopyroxene-clinopyroxene basic granulite boudins are
enclosed in migmatites. Melt-bearing associations differs with respect to
bulk chemical compositions, leading to cordierite + melt, orthopyroxene +
melt and garnet + melt associations.
Absolute geochronological data for the pre-Alpine history of the Valpelline
unit, until now reported as pre-Permian, show that the main metamorphic
and structural imprint of the Valpelline unit is Permian, corresponding to
the main granulite imprint, characterized by pegmatite bodies and by the
partial melting of metapelites.
These results highlight the occurrence of an important
tectonometamorphic Permian event in this portion of Austroalpine
basement, likely reflecting a lithospheric scale thermal perturbation in the
whole African continental lithosphere (SPALLA AND MAROTTA, 2007;
PERESSINI et al., 2007). (literal)
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