Journal
TERRA NOVA
Volume -, Issue -, Pages -Publisher
WILEY
DOI: 10.1111/ter.12646
Keywords
Cyclades; ductile thinning; Folegandros; Miocene; pure-shear flattening
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Folegandros island is located between the established West Cycladic and Santorini detachment systems, preserving shear-sense indicators with opposing kinematics. The geodynamics and timing of kinematics are debated.
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.
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