Miocene ductile thinning below the Folegandros Detachment System, Cyclades, Greece

Author(s): C. Bakowsky, D. A. Schneider, B. Grasemann, K. Soukis
Abstract: 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(s): Department of Geology
External organisation(s): University of Ottawa, National & Kapodistrian University of Athens
Journal: Terra Nova
Volume: 35
Pages: 220-229
No. of pages: 10
ISSN: 0954-4879
DOI: https://doi.org/10.1111/ter.12646
Publication date: 2023
Peer reviewed: Yes
Austrian Fields of Science 2012: 105124 Tectonics
Keywords
ASJC Scopus subject areas: Geology
Portal url: https://ucrisportal.univie.ac.at/en/publications/80502e97-525f-46d3-bd91-10c6e675cc6f

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