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Anomalously Low Temperature Orthopyroxene, Spinel, and Sapphirine Occurrences in Metasediments from the Bamble Amphibolite‐to‐Granulite Facies Transition Zone (South Norway): Possible Evidence for Localized Action of Saline Fluids: A Reply

The question has been raised whether isolated granulite facies “islands,” which occur throughout the amphibolite facies of the regional amphibolite‐to‐granulite facies transition zone in the central part of the Bamble sector, southern Norway are the result of prograde or retrograde metamorphism. We have studied one of these islands, the sapphirine granulites at Hauglandsvatn. Despite the preponderance of amphibolite facies assemblages in the surrounding rocks and the small scale of distribution of the granulite facies assemblages, the current assemblage is considered to be prograde, and has developed at the expense of biotite in the regional main foliation, leaving relict biotite separated from quartz by a continuous corona of orthopyroxene and K‐feldspar. Other high temperature, low aH2O reactions resulted in the formation of spinel ± corundum + albite/oligoclase symplectites at the expense of biotite and sillimanite. The symplectites have partially been replaced by symplectites of tiny blue sapphirine ±...