Abstract
The high-grade low-pressure metamorphism in Rogaland increases towards the southwest to reach a maximum near the border of the Egersund intrusive complex. The first isograd is the “hypersthene line”, marking the appearance of hypersthene in rocks of leucogranitic composition. A few kilometres westward hornblende + quartz are replaced by pyroxenes in mafic rocks, and the amphibole colour grades from green to brown in Ti-bearing rocks. Somewhat west of the hypersthene line garnet + silli-manite give way to cordierite + spinel/magnetite. A second isograd heralds the partial decomposition of garnet to orthopyroxene + cordierite + spinel/magnetite. In rocks richer in Fe, garnet + sillima-nite react to spinel/magnetite + quartz. In potash-rich compositions garnet + biotite + quartz ± sillimanite react to osumilite + orthopyro¬xene + spinel/magnetite. Near the intrusive complex a third isograd marks the incoming of metamorphic pigeonite in leucogranitic rocks. The temperature range of the whole zoning from the hypersthene line to the complex is estimated at 700-1050°C at a pressure of 4–6 kb, although remnants of a higher-pressure older metamorphism may be present. Somewhat younger retrograde metamorphism is widespread, and includes decomposition of osumilite and the growth of garnet rims.
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Tobi, A.C., Hermans, G.A.E.M., Maijer, C., Jansen, J.B.H. (1985). Metamorphic Zoning in the High-Grade Proterozoic of Rogaland-Vest Agder, SW Norway. In: Tobi, A.C., Touret, J.L.R. (eds) The Deep Proterozoic Crust in the North Atlantic Provinces. NATO ASI Series, vol 158. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-5450-2_28
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DOI: https://doi.org/10.1007/978-94-009-5450-2_28
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