Structural Study and Detrital Zircon Provenance Analysis of the Cycladic Blueschist Unit Rocks from Iraklia Island: From the Paleozoic Basement Unroofing to the Cenozoic Exhumation
Detailed mapping and structural observations on the Cycladic Blueschist Unit (CBU) on Iraklia Island integrated with detrital zircon (DZ) U-Pb ages elucidate the Mesozoic pre-subduction and the Cenozoic orogenic evolution. Iraklia tectonostratigraphy includes a heterogeneous Lower Schist Fm., juxtap...
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MDPI AG
2022-01-01
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| author | Sofia Laskari Konstantinos Soukis Stylianos Lozios Daniel F. Stockli Eirini M. Poulaki Christina Stouraiti |
| author_facet | Sofia Laskari Konstantinos Soukis Stylianos Lozios Daniel F. Stockli Eirini M. Poulaki Christina Stouraiti |
| author_sort | Sofia Laskari |
| collection | DOAJ |
| description | Detailed mapping and structural observations on the Cycladic Blueschist Unit (CBU) on Iraklia Island integrated with detrital zircon (DZ) U-Pb ages elucidate the Mesozoic pre-subduction and the Cenozoic orogenic evolution. Iraklia tectonostratigraphy includes a heterogeneous Lower Schist Fm., juxtaposed against a Marble Fm. and an overlying Upper Schist Fm. The contact is an extensional ductile-to-brittle-ductile, top-to-N shear zone, kinematically associated with the Oligo-Miocene exhumation. The DZ spectra of the Lower Schist have Gondwanan/peri-Gondwanan provenance signatures and point to Late Triassic Maximum Depositional Ages (MDAs). A quartz-rich schist lens yielded Precambrian DZ ages exclusively and is interpreted as part of the pre-Variscan metasedimentary Cycladic Basement, equivalent to schists of the Ios Island core. The Upper Schist represents a distinctly different stratigraphic package with late Cretaceous MDAs and dominance of Late Paleozoic DZ ages, suggestive of a more internal Pelagonian source. The contrast in the DZ U-Pb record between Lower and Upper Schist likely reflects the difference between a Paleotethyan and Neotethyan geodynamic imprint. The Triassic DZ input from eroded volcanic material is related to the final Paleotethys closure and Pindos/CBU rift basin opening, while late Cretaceous metamorphic/magmatic zircons and ~48–56 Ma zircon rims constrain the onset of Neotethyan convergence and high-pressure subduction metamorphism. |
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| spelling | doaj.art-e8306f879d934f9aaf23693a5e98033f2023-11-23T14:50:01ZengMDPI AGMinerals2075-163X2022-01-011218310.3390/min12010083Structural Study and Detrital Zircon Provenance Analysis of the Cycladic Blueschist Unit Rocks from Iraklia Island: From the Paleozoic Basement Unroofing to the Cenozoic ExhumationSofia Laskari0Konstantinos Soukis1Stylianos Lozios2Daniel F. Stockli3Eirini M. Poulaki4Christina Stouraiti5Faculty of Geology and Geoenvironment, National and Kapodistrian University of Athens, 15784 Athens, GreeceFaculty of Geology and Geoenvironment, National and Kapodistrian University of Athens, 15784 Athens, GreeceFaculty of Geology and Geoenvironment, National and Kapodistrian University of Athens, 15784 Athens, GreeceDepartment of Geological Sciences, Jackson School of Geosciences, University of Texas at Austin, Austin, TX 78712, USADepartment of Geological Sciences, Jackson School of Geosciences, University of Texas at Austin, Austin, TX 78712, USAFaculty of Geology and Geoenvironment, National and Kapodistrian University of Athens, 15784 Athens, GreeceDetailed mapping and structural observations on the Cycladic Blueschist Unit (CBU) on Iraklia Island integrated with detrital zircon (DZ) U-Pb ages elucidate the Mesozoic pre-subduction and the Cenozoic orogenic evolution. Iraklia tectonostratigraphy includes a heterogeneous Lower Schist Fm., juxtaposed against a Marble Fm. and an overlying Upper Schist Fm. The contact is an extensional ductile-to-brittle-ductile, top-to-N shear zone, kinematically associated with the Oligo-Miocene exhumation. The DZ spectra of the Lower Schist have Gondwanan/peri-Gondwanan provenance signatures and point to Late Triassic Maximum Depositional Ages (MDAs). A quartz-rich schist lens yielded Precambrian DZ ages exclusively and is interpreted as part of the pre-Variscan metasedimentary Cycladic Basement, equivalent to schists of the Ios Island core. The Upper Schist represents a distinctly different stratigraphic package with late Cretaceous MDAs and dominance of Late Paleozoic DZ ages, suggestive of a more internal Pelagonian source. The contrast in the DZ U-Pb record between Lower and Upper Schist likely reflects the difference between a Paleotethyan and Neotethyan geodynamic imprint. The Triassic DZ input from eroded volcanic material is related to the final Paleotethys closure and Pindos/CBU rift basin opening, while late Cretaceous metamorphic/magmatic zircons and ~48–56 Ma zircon rims constrain the onset of Neotethyan convergence and high-pressure subduction metamorphism.https://www.mdpi.com/2075-163X/12/1/83Cycladic Blueschist Unitdetrital zircon U-Pb datingIraklia IslandMaximum Depositional AgeprovenancePaleotethys |
| spellingShingle | Sofia Laskari Konstantinos Soukis Stylianos Lozios Daniel F. Stockli Eirini M. Poulaki Christina Stouraiti Structural Study and Detrital Zircon Provenance Analysis of the Cycladic Blueschist Unit Rocks from Iraklia Island: From the Paleozoic Basement Unroofing to the Cenozoic Exhumation Minerals Cycladic Blueschist Unit detrital zircon U-Pb dating Iraklia Island Maximum Depositional Age provenance Paleotethys |
| title | Structural Study and Detrital Zircon Provenance Analysis of the Cycladic Blueschist Unit Rocks from Iraklia Island: From the Paleozoic Basement Unroofing to the Cenozoic Exhumation |
| title_full | Structural Study and Detrital Zircon Provenance Analysis of the Cycladic Blueschist Unit Rocks from Iraklia Island: From the Paleozoic Basement Unroofing to the Cenozoic Exhumation |
| title_fullStr | Structural Study and Detrital Zircon Provenance Analysis of the Cycladic Blueschist Unit Rocks from Iraklia Island: From the Paleozoic Basement Unroofing to the Cenozoic Exhumation |
| title_full_unstemmed | Structural Study and Detrital Zircon Provenance Analysis of the Cycladic Blueschist Unit Rocks from Iraklia Island: From the Paleozoic Basement Unroofing to the Cenozoic Exhumation |
| title_short | Structural Study and Detrital Zircon Provenance Analysis of the Cycladic Blueschist Unit Rocks from Iraklia Island: From the Paleozoic Basement Unroofing to the Cenozoic Exhumation |
| title_sort | structural study and detrital zircon provenance analysis of the cycladic blueschist unit rocks from iraklia island from the paleozoic basement unroofing to the cenozoic exhumation |
| topic | Cycladic Blueschist Unit detrital zircon U-Pb dating Iraklia Island Maximum Depositional Age provenance Paleotethys |
| url | https://www.mdpi.com/2075-163X/12/1/83 |
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