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Rapid Exhumation of High-Pressure Metamorphic Rocks in Kythera-Peloponnese (Greece) Revealed by Apatite (U-Th)/He Thermochronology

Rapid Exhumation of High-Pressure Metamorphic Rocks in Kythera-Peloponnese (Greece) Revealed by... Abstract Apatite (U-Th)/He and apatite fission-track cooling ages from high-pressure (HP) metamorphic rocks in the South Aegean forearc along the Kythera Strait (Kythera and southeastern Peloponnese) suggest rapid exhumation during Middle to Late Miocene times. HP rocks from the Kythera Strait exhibit two perpendicular extensional structures. Samples with arc-normal or arc-parallel extensional fabrics yielded apatite (U-Th)/He cooling ages of ∼8–10 Ma. The more precise (U-Th)/He ages are consistent with previously reported apatite and zircon fission-track ages obtained from the same rock units. The less precise, but still accurate, fission-track data provided a reference for (U-Th)/He dating on relatively young uranium-poor apatites. The combined data, therefore, precisely and accurately constrain the exhumation history of HP rocks and indicate that localized arc-parallel extension in the Kythera Strait was active for an ∼5 m.yr. interval during the regional arc expansion. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png The Journal of Geology University of Chicago Press

Rapid Exhumation of High-Pressure Metamorphic Rocks in Kythera-Peloponnese (Greece) Revealed by Apatite (U-Th)/He Thermochronology

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References (170)

Publisher
University of Chicago Press
Copyright
Copyright © University of Chicago Press
ISSN
0022-1376
eISSN
1537-5269
DOI
10.1086/675908
Publisher site
See Article on Publisher Site

Abstract

Abstract Apatite (U-Th)/He and apatite fission-track cooling ages from high-pressure (HP) metamorphic rocks in the South Aegean forearc along the Kythera Strait (Kythera and southeastern Peloponnese) suggest rapid exhumation during Middle to Late Miocene times. HP rocks from the Kythera Strait exhibit two perpendicular extensional structures. Samples with arc-normal or arc-parallel extensional fabrics yielded apatite (U-Th)/He cooling ages of ∼8–10 Ma. The more precise (U-Th)/He ages are consistent with previously reported apatite and zircon fission-track ages obtained from the same rock units. The less precise, but still accurate, fission-track data provided a reference for (U-Th)/He dating on relatively young uranium-poor apatites. The combined data, therefore, precisely and accurately constrain the exhumation history of HP rocks and indicate that localized arc-parallel extension in the Kythera Strait was active for an ∼5 m.yr. interval during the regional arc expansion.

Journal

The Journal of GeologyUniversity of Chicago Press

Published: Jul 1, 2014

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