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Photos - serie 1

4) Tension Gashes 5) Cartography  

Tectonic map
Result of our detailled cartography of Alpe Larecc

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).

Other maps "home-made" here!!!

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.

See the publication (or our diploma work) for complete information!!!

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

Info on copyright || Download the abstract | the publication (PDF)

Photo - serie 2

Uni Lausanne || Geology 2003-2005 © Xavier Maeder & Julien Allaz
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Created: 10th May 2003
Last update: 3rd March 2012