PDF Publication Title:
Text from PDF Page: 005
190 M. Marthaler and H. Rougier Fig. 13.3 The Matterhorn as viewed from Zermatt, with various toponyms used in the text (photo E. Reynard) The village of Zermatt itself is built on dark and dense ophiolitic rocks, mainly metagabbros and serpentinites (Zermatt-Saas Unit; Fig. 13.7). The sedimentary cover of this ocean floor begins with radiolarites and middle Jurassic marbles (De Wever and Caby 1981). The result is a thick series of shales and calc- schists, called lustrous shales (“Schistes lustrés) (Deville et al. 1992), which dates from the Lower Cretaceous to the Upper Cretaceous (Marthaler 1984). These shales are visible on the path to the Hörnli hut, between 2700 and 3000 m a.s. l.; then the slope rises to cross a bar of prasinites just below the flat sector, due to the presence of serpentinites, on which the hut is built (Fig. 13.3). 13.2.3 The Rocks of the European Margin Today, the rocks of the European margin are distributed in several basements and cover nappes (Escher et al. 1997; Fig. 13.8). These nappes all come from the Briançonnais pale- ogeographic domain, located south of the European plate. During the Jurassic and Cretaceous, the Briançonnais broke away from the large Eurasian plate to become a micro-continent, probably attached to the Iberian plate (Fig. 13.9). The Basement Nappes: Siviez-Mischabel and Monte Rosa Nappes The Siviez-Mischabel nappe, which outcrops in the Mat- tervispa Valley up to the entrance to Zermatt (Fig. 13.7), is formed of varied gneisses, the oldest ones, rich in amphi- bolites, being probably Cambrian in age (Thélin et al. 1993; Sartori et al. 2006). The large mass of Paleozoic gneisses of the Monte Rosa nappe further south has undergone high-pressure alpine metamorphism. The major part is formed of augen orthogneiss of granitic origin (Bearth 1953). The Cover Nappes: Siviez-Mischabel, Cimes Blanches and Frilihorn nappes The Barrhorn unit (Sartori 1990), covering the Siviez-Mischabel nappe, shows a succession of dolomitic limestone (Triassic), massive limestone (Jurassic) andPDF Image | An Outstanding Mountain The Matterhorn
PDF Search Title:
An Outstanding Mountain The MatterhornOriginal File Name Searched:
MatterhornOutstandingMountain.pdfDIY PDF Search: Google It | Yahoo | Bing
Cruise Ship Reviews | Luxury Resort | Jet | Yacht | and Travel Tech More Info
Cruising Review Topics and Articles More Info
Software based on Filemaker for the travel industry More Info
The Burgenstock Resort: Reviews on CruisingReview website... More Info
Resort Reviews: World Class resorts... More Info
The Riffelalp Resort: Reviews on CruisingReview website... More Info
| CONTACT TEL: 608-238-6001 Email: greg@cruisingreview.com | RSS | AMP |