Éclogite du Lac Cornu

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Darstellung und Status

Farbe CMYK
(49%,0%,37%,31%)
Farbe RGB
R: 90 G: 175 B: 110
Rang
lithostratigraphische Formation
Gebrauch
Element ist in Gebrauch
Status
informeller Begriff

Nomenklatur

Deutsch
Lac-Cornu-Eklogit
Français
Éclogite du Lac Cornu
Italiano
Eclogite del Lac Cornu
English
Lac Cornu Eclogite
Herkunft des Namens

Lac Cornu (France)

Historische Varianten

éclogites des Aiguilles Rouges (Joukowsky 1902), Lac Cornu retrograded eclogites (Liégeois & Duchesne 1981), --- (Paquette et al. 1989), masse-relique d'éclogites du lac Cornu (Pairis et al. 1992), mafic éclogites of Lac Cornu (Pfeifer & von Raumer 1996), éclogites du lac Cornu (Drouet & Leloup 2015)

Beschreibung

Beschreibung

14 kbar, min. 700°C (Schulz & von Raumer 1993)

Alter

Alter Top
  • Spätes Ordovizium
Alter Basis
  • Mittleres Ordovizium
Datierungsmethode

453 +3/-2 Ma (Paquette et al. 1989), 458 +/-5 Ma (Bussy et al. 2011), 463 +/-3 Ma (Bussy et al. 2011 ; protolithe éclogite rubannée)

Referenzen

Neubearbeitung
Bussy François, von Raumer Jürgen, Capuzzo Nicola (2001) : Mont-Blanc, Aiguilles-Rouges massifs (External Massifs) - an example of polyorogenic evolution. Fieldtrip Guide 1, 53-84, Univ. Lausanne

p. 65: (Retro-)eclogitized pyroxenites, lherzolites and N-MORB-type basalts are outcropping in the Lake Cornu area (Aiguilles Rouges). Paquette et al. (1989) interpreted an upper intercept U-Pb zircon age of 453 +2/-3 Ma as a magmatic crystallization age. These rocks were derived from a depleted mantle source (initial ε Nd = +6). They have been originally thought to be emplaced in a thinned continental crust associated with the initial stages of oceanic rifting (Paquette et al., 1989) and more recently to be emplaced in a back-arc setting associated with an active continental margin (Dobmeier et al., 1999). The latter interpretation is supported by the contemporaneous intrusion of several granites of calc-alkaline (Itype) or peraluminous (S-type) character, as expected in an active continental (or island-arc) margin.

Wichtige Publikationen
Liégeois Jean-Paul, Duchesne Jean-Clair (1981) : The Lac Cornu retrograded eclogites (Aiguilles Rouges massif, Western Alps France): evidence of crustal origin and metasomafic alteration. Lithos 14, 35-48
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