Miocene ductile thinning below the Folegandros Detachment System, Cyclades, Greece
- Autor(en)
- C. Bakowsky, D. A. Schneider, B. Grasemann, K. Soukis
- Abstrakt
Folegandros island lies between the established SW-directed West Cycladic and S-directed Santorini detachment systems. Preserving shear-sense indicators with opposing kinematics, the geodynamics and timing of kinematics are debated. Using white mica 40Ar/39Ar geochronology complemented by structural data, we report a new Miocene top-to-S detachment system, the Folegandros Detachment System (FDS), that is coupled with pure-shear flattening and juxtaposes the Cycladic Blueschist Unit below Early Cretaceous to early Eocene low-grade marble and quartzitic-phyllitic sequences, topped by a metaflysch. Chronostratigraphic correlation and detrital zircon geochronology reveal the low-grade rocks from the hanging wall of the FDS likely belong to the Pelagonian Zone. Middle Miocene zircon and apatite (U-Th)/He cooling ages correspond to the latest stages of exhumation. Observations of opposing kinematics on Sikinos, Ios and now Folegandros reveal that ductile thinning played a more significant role in accommodating Miocene exhumation of high-pressure rocks in the southern Cyclades than previously postulated.
- Organisation(en)
- Institut für Geologie
- Externe Organisation(en)
- University of Ottawa, National & Kapodistrian University of Athens
- Journal
- Terra Nova
- Band
- 35
- Seiten
- 220-229
- Anzahl der Seiten
- 10
- ISSN
- 0954-4879
- DOI
- https://doi.org/10.1111/ter.12646
- Publikationsdatum
- 2023
- Peer-reviewed
- Ja
- ÖFOS 2012
- 105124 Tektonik
- Schlagwörter
- ASJC Scopus Sachgebiete
- Geology
- Link zum Portal
- https://ucrisportal.univie.ac.at/de/publications/80502e97-525f-46d3-bd91-10c6e675cc6f