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Cold subduction and the formation of lawsonite eclogite constraints from prograde evolution of eclogitized pillow lava
 

Summary: Cold subduction and the formation of lawsonite eclogite ­
constraints from prograde evolution of eclogitized pillow lava
from Corsica
E. J. K. RAVNA,1
T. B. ANDERSEN,2
L. JOLIVET3
AND C. DE CAPITANI4
1
Department of Geology, University of Tromsø, N-9037 Tromsø, Norway (erling.ravna@uit.no)
2
Department of Geosciences and PGP, University of Oslo, PO Box 1047, Blindern, 0316 Oslo, Norway
3
ISTO, UMR 6113, Universite´ dÕOrle´ans, 1A Rue de la Fe´rollerie, 45071 Orle´ans, Cedex 2, France
4
Mineralogisch-Petrographisches Institut, Universita¨t Basel, Bernoullistrasse 30, 4056 Basel, Switzerland
ABSTRACT A new discovery of lawsonite eclogite is presented from the Lanco^ ne glaucophanites within the Schistes
Lustre´ s nappe at De´ file´ du Lanco^ ne in Alpine Corsica. The fine-grained eclogitized pillow lava and inter-
pillow matrix are extremely fresh, showing very little evidence of retrograde alteration. Peak assemblages
in both the massive pillows and weakly foliated inter-pillow matrix consist of zoned idiomorphic
Mg-poor (<0.8 wt% MgO) garnet + omphacite + lawsonite + chlorite + titanite. A local overprint

  

Source: Andersen, Torgeir Bjørge - Centre for Physics of Geological Processes & Department of Geosciences, Universitetet i Oslo

 

Collections: Geosciences