Metastability and HP metamorphism at fluid deficient conditions, an example from the Bergen Arcs (Western Norway)

Kühn, Alexander; Austrheim, Haakon; Philipp, Sonja; Leiss, Bernd; Vollbrecht, Axel; Tanner, David; Gudmundsson, Agust

Metastability and HP metamorphism at fluid deficient conditions, an example from the Bergen Arcs (Western Norway)

2006

In the Lindæs Nappe, Bergen Arcs Western Norway, Precambrian granulites facies anorthosites (P<10 kbars, T=800°C) and their Caledonian eclogite (P<17 kbars, T=700°C) and amphibolite facies equivalents alternate on meter scale. It has recently been suggested by Camacho et al. (2005) that the granulite facies anorthosites, remained at low temperatures (350°C) and were only locally heated to 700°C and reacted to eclogites by spasmodic hot fluids. This is in contrast to previously published models (Austrheim 1987) where the fluid-triggered mineral reactions in a terrain that was at 700°C during the Caledonian Orogeny. In the latter model the dry granulites metastably survive the Caledonian HP/HT metamorphic event at 425 Ma...

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