Τίτλος:
Geodynamic significance of the Santorini Detachment System (Cyclades, Greece)
Γλώσσες Τεκμηρίου:
Αγγλικά
Περίληψη:
We present field and geochronologic evidence for a Miocene top-to-SSE detachment system on Santorini, which exhumed the Cycladic Blueschist Unit (CBU) below a package of low-grade Upper Triassic marbles that contain well-preserved Megalodon fossils forming a syncline with metaflysch in the core. White mica bundles from the mylonitic foliation in the CBU yield 40Ar/39Ar dates of 25–19 Ma and zircon (U–Th)/He dates are 11–8 Ma. A weakly foliated granitic intrusion that cross-cuts the CBU is 8.5 Ma based on zircon U–Pb geochronology. Detrital white mica from the metaflysch yields Jurassic to early Palaeogene single grain 40Ar/39Ar dates, with a dominant Palaeocene signature. Zircon (U–Th)/He dating similarly reveals dispersed ages between 36 and 15 Ma suggesting Miocene metamorphic temperatures were insufficient (<200°C) to completely reset all of the zircon cooling ages. The low-grade rocks of the hangingwall above the newly discovered Miocene low-angle Santorini Detachment System most likely belong to the Pelagonian zone with a Triassic carbonate platform discordantly transgressed by an Eocene flysch deposit. © 2018 John Wiley & Sons Ltd
Συγγραφείς:
Schneider, D.A.
Grasemann, B.
Lion, A.
Soukis, K.
Draganits, E.
Εκδότης:
Wiley-Blackwell Publishing Ltd
Λέξεις-κλειδιά:
argon-argon dating; detachment fault; foliation; fossil; geochronology; geodynamics; marble; mica; Miocene; syncline; Triassic; uranium series dating; zircon, Greece; Santorini [Southern Aegean]; Southern Aegean
