KRABBENDAM, M., WAIN, A., ANDERSEN, T. B. (2000) Pre-Caledonian granulite and gabbro enclaves in the Western Gneiss Region, Norway: indications of incomplete transition at high pressure. Geological Magazine, 137 (3) 235-255 doi:10.1017/s0016756800004015
| Reference Type | Journal (article/letter/editorial) | ||
|---|---|---|---|
| Title | Pre-Caledonian granulite and gabbro enclaves in the Western Gneiss Region, Norway: indications of incomplete transition at high pressure | ||
| Journal | Geological Magazine | ||
| Authors | KRABBENDAM, M. | Author | |
| WAIN, A. | Author | ||
| ANDERSEN, T. B. | Author | ||
| Year | 2000 (May) | Volume | 137 |
| Page(s) | 235-255 | Issue | 3 |
| Publisher | Cambridge University Press (CUP) | ||
| DOI | doi:10.1017/s0016756800004015Search in ResearchGate | ||
| Mindat Ref. ID | 258393 | Long-form Identifier | mindat:1:5:258393:2 |
| GUID | 9d96b9d5-68b6-4a85-ba4e-b9fa5112318c | ||
| Full Reference | KRABBENDAM, M., WAIN, A., ANDERSEN, T. B. (2000) Pre-Caledonian granulite and gabbro enclaves in the Western Gneiss Region, Norway: indications of incomplete transition at high pressure. Geological Magazine, 137 (3) 235-255 doi:10.1017/s0016756800004015 | ||
| Plain Text | KRABBENDAM, M., WAIN, A., ANDERSEN, T. B. (2000) Pre-Caledonian granulite and gabbro enclaves in the Western Gneiss Region, Norway: indications of incomplete transition at high pressure. Geological Magazine, 137 (3) 235-255 doi:10.1017/s0016756800004015 | ||
| In | (2000, May) Geological Magazine Vol. 137 (3) Cambridge University Press (CUP) | ||
| Abstract/Notes | The Western Gneiss Region of Norway is a continental terrane that experienced Caledonian high-pressure and ultrahigh-pressure metamorphism. Most rocks in this terrane show either peak-Caledonian eclogite-facies assemblages or are highly strained and equilibrated under late-Caledonian amphibolite-facies conditions. However, three kilometre-size rock bodies (Flatraket, Ulvesund and Kråkenes) in Outer Nordfjord preserve Pre-Caledonian igneous and granulite-facies assemblages and structures. Where these assemblages are preserved, the rocks are consistently unaffected by Caledonian deformation. The three bodies experienced high-pressure conditions (20–23 kbar) but show only very localized (about 5%) eclogitization in felsic and mafic rocks, commonly related to shear zones. The preservation of Pre-Caledonian felsic and mafic igneous and granulite-facies assemblages in these bodies, therefore, indicates widespread (∼ 95%) metastability at pressures higher than other metastable domains in Norway. Late-Caledonian amphibolite-facies retrogression was limited. The degree of reaction is related to the protolith composition and the interaction of fluid and deformation during the orogenic cycle, whereby metastability is associated with a lack of deformation and lack of fluids, either as a catalyst or as a component in hydration reactions. The three bodies appear to have been far less reactive than the external gneisses in this region, even though they followed a similar pressure–temperature evolution. The extent of metastable behaviour has implications for the protolith of the Western Gneiss Region, for the density evolution of high-pressure terranes and hence for the geodynamic evolution of mountain belts. | ||
Locality Pages
| Locality | Citation Details |
|---|---|
| Western Gneiss Region, Norway |
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