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Coupled replacement and preservation of high pressure rocks caused by infiltration of mixed H2O-CO2 fluids
Stockholm University, Faculty of Science, Department of Geological Sciences.
Stockholm University, Faculty of Science, Department of Geological Sciences.
Stockholm University, Faculty of Science, Department of Geological Sciences.
(English)Manuscript (preprint) (Other academic)
Abstract [en]

Eclogites, blueschists and greenschists are found in close proximity to one another along a 1-km coastal section where the Cyclades Blueschist Unit is exposed on SE Syros, Greece. Here we show that the eclogites and blueschists experienced similar metamorphic histories: prograde lawsonite blueschist facies metamorphism at 1.1–1.4 GPa and 380–460 °C followed, at 38–43 Ma, by peak blueschist/eclogite facies metamorphism at 1.5–1.8 GPa and 470–500 °C. We explain co-existence of eclogites and blueschists by compositional variation probably reflecting original (sedimentary) layering. We also show that the greenschists record retrogression at 0.34 ± 0.21 GPa and T = 456 ± 68 °C associated with fluid flow along a shear zone, bearing eclogite facies ultramafic knockers, that cuts across the section. Finally, we show that greenschist facies retrogression ended at (or slightly after) 27 Ma. This implies a period of metamorphic quiescence after eclogite/blueschist facies metamorphism and before greenschist facies retrogression that may have lasted 13–16 million years. We suggest that this reflects an absence of metamorphic fluid flow at that time. Referring to local preservation of blueschists and eclogites along the coastal section, we infer that retrogression only occurred when and where metamorphic fluid flow occurred. Finally, from a tectonic perspective, our findings are consistent with studies showing that 1) the Cyclades Blueschist Unit is a high-pressure nappe stack consisting of belts in which high pressure metamorphism occurred at different times and 2) these rocks were affected by regionally extensive greenschist facies metamorphism during the Oligocene.

National Category
Earth and Related Environmental Sciences
Research subject
Geology
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URN: urn:nbn:se:su:diva-155217OAI: oai:DiVA.org:su-155217DiVA, id: diva2:1197773
Available from: 2018-04-13 Created: 2018-04-13 Last updated: 2018-04-16Bibliographically approved
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