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| Titel |
Feedback between fluid flow and rheology during the evolution of the East Tenda Shear Zone (Haute Corse, France). |
| VerfasserIn |
M. Maggi, F. Rossetti, G. Ranalli, T. Theye |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250067892
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| Zusammenfassung |
| The East Tenda Shear Zone (ETSZ) is the major Alpine tectonic boundary marking the
overthrusting of the oceanic-derived Schistes Lustrés nappe onto the Hercynian crystalline
basement of western Corsica. In this work we present new structural and geochemical
investigations along a transect ranging from the undeformed protolith (PR) to the contact with
the Schistes Lustrés. The results are used to construct a rheological model for the
ETSZ.
Shear deformation within the ETSZ is heterogeneously distributed with high-strain
domains (shear zones, SZ) wrapping sigmoid shaped low-strain domains (massive lenses,
ML). Locally, mica-rich mylonites occur (phyllonites). The main foliation is concordant with
that in the overlying Schistes Lustrés, strikes NW-SE, and is dominantly shallow-dipping to
NE. The ML mineralogy consists of an assemblage made of quartz, phengite and (relict)
feldspar (epidote, Fe-oxides, zircon and allanite as accessory phases). The SZ mineralogy is
invariably dominated by highly celadonitic (Si4+= 3.5-3.7 a.p.f.u.) phengite (40 ± 10 vol%)
and modally abundant quartz (35 ± 5 vol%), albite (15 ± 5 vol%) epidote ( |
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