Metastability and HP metamorphism at fluid deficient conditions, an example from the Bergen Arcs (Western Norway)
Kühn, Alexander
Austrheim, Haakon
Universitätsverlag Göttingen
Article in Anthology
Verlagsversion
Deutsch
Kühn, Alexander; Austrheim, Haakon, 2006: Metastability and HP metamorphism at fluid deficient conditions, an example from the Bergen Arcs (Western Norway). In: Philipp, S.; Leiss, B; Vollbrecht, A.; Tanner, D.; Gudmundsson, A. (eds.): 11. Symposium "Tektonik, Struktur- und Kristallingeologie"; 2006, Univ.-Verl. Göttingen, p. 121 - 122., , DOI: 10.23689/fidgeo-1846.
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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...