Tectonic and metamorphic evolution of Simano nappe at Alpe Larecc (Tessin, CH) © 2003-2007, Uni. Lausanne (Switzerland).
Contacts: Xavier MAEDER (maederx@uni-mainz.de) or Julien ALLAZ (jallaz@geo.unibe.ch)
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| 4) Tension Gashes | 5) Cartography |
Result of our detailled cartography of Alpe Larecc (2001-2002) |
A detail cartographic* study has allowed to highlight a discordant* contact between the Campo Tencia mass metasediments and the subjacent amphibolites. This could either represent a tectonic*, or a sedimentary contact* with perhaps a time-gap. The latter interpretation is compatible with an episode of rifting* and sedimentation in a system of tilted blocks*. The contact between amphibolite and augen gneiss* of the Verzasca complex is delimited by a sheared border facies of the augen gneiss (alpine or variscian deformation). |
The geochemistry* of Alpe Larecc amphibolites denotes an E-MORB* or OIB* signature. Their close association with a quartzo-feldspathic* series and the gradual transition from levels more or less rich in amphiboles led us to interpret them as a volcanogenic* series, emplaced in a context of rifting, at the foot of the margin*. The caledonian* age of the underlying granites (450 My, Köppel et al. 1980 [reference]) suggests that these amphibolites are related to the Paleotethys* rifting. |
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1) Introduction | 2) Structural | 3) Thermobarometry | 4) Tension gashes | 5) CARTOGRAPHY | Bibliography | Thanks
Aluminosilicate-bearing veines: 4.1) Mineralogy | 4.2) Structure | 4.3) Examples | 4.4) Formation
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