Trift-Formation
Retour à massif de l'AarReprésentation et statut
- Index
- hTr
- Couleur CMYK
- 40 / 20 / 40 / 0
- Couleur RGB
- R: 160 G: 180 B: 160
- Rang
- Formation lithostratigraphique
- Usage
- Ce terme est en usage.
- Status
- terme informel
Nomenclature
- Deutsch
- Trift-Formation
- Français
- Formation du Trift
- Italiano
- Formazione del Trift
- English
- Trift Formation
- Origine du nom
-
Triftgletscher (BE), Innertkirchen (Das Typusprofil liegt unterhalb der Triffthütte SAC)
- Variantes historiques
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Trift-Formation (Schenker 1986, Schenker & Abrecht 1987), Trift Formation (Berger et al. 2017)
- Remarques nomenclatoriales
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Glacier du Trift, pont suspendu du Trift
Description
- Description
-
Tonschiefer, Konglomerate und vulkanogene Abfolgen (Pyroklastite und Rhyolithe)
- Épaisseur
- Max. 140 m am Chilchlistock, ca. 100 m an der Trifthütte.
Âge
- Âge au sommet
-
- Pennsylvanien tardif
- Âge à la base
-
- Pennsylvanien tardif
Paléogéographie et tectonique
- Paléogéographie
- continent européen
- Termes génériques
Références
- Révision
-
(2017) :
Geological Map of the Aar Massif, Tavetsch and Gotthard Nappes. Geological Special Map 1:100'000, Explanatory Notes 129
p.46: The Trift Formation, outcropping in the Trift area, contains a fine- to coarse-grained clastic metasedimentary rocks (metaconglomerates) with volcanic and volcaniclastic intercalations (Fig.6, see also detailed lithostratigraphic descriptions given by SCHENKER & ABRECHT 1987 and OBERHÄNSLI et al.1988). SCHENKER & ABRECHT (1987) reported a metamorphic garnet-biotite parageneses in the more sandy parts of the formation. This indicates the influence of the thermal aureole of the intruding Variscan plutonic rocks since the much younger regional Alpine metamorphism did not reach temperatures high enough to form this parageneses. Despite the lack of outcropping intrusive contacts, it was assumed that also this formation has been buried at depths, which would be consistent with the intrusion depth estimated for plutonic rocks of the Haslital Group (p. 51 f.). The Trift Formation generally marks the southeastern border of the Ferden-Guttannen Zone (Guttannen Gneiss Complex, SCHENKER & ABRECHT 1987). Further to the southwest, two small and isolated occurrences of Late Carboniferous rocks north of the Hienderstock and south of the Agassizhorn are assigned to the Trift Formation due to their similar tectonic position at the southeastern border of the Guttannen Gneiss Complex.