Closure of the Paleotethys in the External Hellenides: Constraints from U–Pb ages of magmatic and detrital zircons (Crete)

Zulauf, Gernold; Dörr, Wolfgang; Fisher-Spurlock, S. C.; Gerdes, Axel; Chatzaras, Vasileios; Xypolias, P.

doi:10.1016/j.gr.2014.06.011

Cited by 60 publications

(77 citation statements)

References 70 publications

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“…An age distribution with African meta‐cratonic and Pan‐African peaks is diagnostic of sedimentary rocks sourced from Gondwana or peri‐Gondwanan terranes. Additionally, the DZ age spectra (Figure ) of the studied preplutonic metasedimentary rocks share a striking resemblance to the DZ age spectra of the Phyllite‐Quartzite unit exposed on Crete and in the northern and central Peloponnese (Chatzaras et al, ; Kydonakis et al, ; Zulauf et al, ), as well as to the northern Hellenides (Himmerkus et al, ) and to the siliciclastic cover sequence of the Menderes massif in western Turkey (Zlatkin et al, ). These dominant, Gondwanan‐sourced age modes and the lack of Laurussian‐source age modes (e.g., ~1,100‐1,300 Ma, “Grenville peaks”; e.g., Safonova et al, , and references therein) suggests that the preintrusive to synintrusive metasedimentary host rocks on Ios are part of a peri‐Gondwanan terrane, likely the Hunic superterrane rifted from eastern portions of western Gondwana (Stampfli & Borel, ).…”

Section: Chronostratigraphy and Provenance Of Metasedimentary Rocksmentioning

confidence: 74%

“…The geology of mainland Greece and the Peloponnese comprises a series of nappes that represent continental and oceanic terranes of (peri‐)Gondwanan affinity, which rifted off the Neo‐Tethyan margin and sequentially accreted onto the southern Eurasian margin during the late Mesozoic‐Cenozoic subduction of the African‐Neo‐Tethys slab (e.g., Chatzaras et al, ; Jacobshagen, ; Jolivet et al, ; Jolivet & Brun, ; Menant et al, ; Menant et al, ; Menant et al, ; Papanikolaou, ; Papanikolaou & Ebner, ; Papanikolaou & Sassi, ; Pe‐Piper, ; Pe‐Piper & Piper, ; Ring et al, ; Stampfli & Borel, ; Zulauf et al, ). These terranes are separated by thrust faults and flysch deposits associated with final subduction and accretion (Papanikolaou, ; Piper, ) and were later modified by back‐arc extension and strike‐slip faulting.…”

Section: Geologic Backgroundmentioning

confidence: 99%

“…Tectonics and central Peloponnese (Chatzaras et al, 2016;Kydonakis et al, 2014;Zulauf et al, 2015), as well as to the northern Hellenides (Himmerkus et al, 2007) and to the siliciclastic cover sequence of the Menderes massif in western Turkey (Zlatkin et al, 2013). These dominant, Gondwanan-sourced age modes and the lack of Laurussian-source age modes (e.g.,~1,100-1,300 Ma, "Grenville peaks"; e.g., Safonova et al, 2010, and references therein) suggests that the preintrusive to synintrusive metasedimentary host rocks on Ios are part of a peri-Gondwanan terrane, likely the Hunic superterrane rifted from eastern portions of western Gondwana (Stampfli & Borel, 2002).…”

Section: 1029/2018tc005436mentioning

confidence: 99%

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Tectono‐magmatic and Stratigraphic Evolution of the Cycladic Basement, Ios Island, Greece

et al. 2019

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The Cycladic Basement (CB) and the overlying Cycladic Blueschist Unit (CBU) are part of the Paleogene Cycladic subduction complex exposed in Miocene metamorphic core complexes in the distended back‐arc of the retreating Hellenic subduction zone of the southern Aegean. While the Cenozoic tectono‐metamorphic evolutions of the CB and the CBU have been the foci of numerous studies, this study presents new laser ablation inductively coupled plasma mass spectrometry bedrock and detrital zircon (DZ) U‐Pb ages that place robust constraints on the presubduction tectonic, magmatic, and paleogeographic evolution of the CB. Zircon U‐Pb ages of crystalline CB are ~306‐330 Ma, demonstrating local plutonism associated with regional voluminous, protracted Carboniferous magmatism related to Paleo‐Tethys subduction. The plutons intruded the CB metasedimentary host‐rock sequence, characterized by distinct Gondwanan DZ U‐Pb provenance, Neoproterozoic to early Paleozoic maximum depositional ages, and synmagmatic, contact metamorphic zircon rims (~300‐330 Ma). DZ U‐Pb dating revealed postmagmatic Permian metasedimentary rocks (~270‐295 Ma) that unconformably overlie the CB and have unimodal DZ spectra that indicate exhumation of the CB prior to Permian deposition within extensional basins, as well as mark the onset of CBU deposition prior to formation of the Pindos rift domain. These U‐Pb results clarify the late Paleozoic‐early Mesozoic evolution of the CB as a peri‐Gondwanan terrane composed of Neoproterozoic and early Paleozoic metasedimentary rocks, intruded by voluminous Carboniferous arc magmatism, and exhumed in the Permian, prior to Triassic rifting and CBU deposition. Additionally, these data provide a chronostratigraphic framework and illuminate subduction‐related juxtaposition within the CB metasedimentary sequence.

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Section: Chronostratigraphy and Provenance Of Metasedimentary Rocksmentioning

confidence: 74%

Section: Geologic Backgroundmentioning

confidence: 99%

Section: 1029/2018tc005436mentioning

confidence: 99%

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Tectono‐magmatic and Stratigraphic Evolution of the Cycladic Basement, Ios Island, Greece

et al. 2019

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“…(a) Schematic temperature history and (b–d) corresponding ZHe inheritance date‐eU curves for grains with 35‐80 μm equivalent spherical radii. In b), five inheritance histories are shown as curves for detrital zircon age populations of 2,600, 2,000, 1,000, 600, and 200 Ma (Zulauf et al, ), and in (c) and (d) those curves converge. Each thermal history shares the same path (a) except heated to different maximum temperatures (b–d) at 195, 200, and 205 °C, respectively, within the ZHe partial retention zone (PRZ) from circa 24–20 Ma, the timing of metamorphism.…”

Section: Geochronologymentioning

confidence: 99%

“…(ii) The Pre-Cimmerian Basement Unit consists of four complexes, which are composed of various protoliths and experienced different pre-Alpine metamorphic histories (Franz et al, 2005;Romano et al, 2004;Zulauf et al, 2018). (iii) The Tyros Unit represents Permian-Norian/Rhaetian volcano sedimentary rock with Middle Triassic intrusions (Zulauf et al, , 2013(Zulauf et al, , 2015(Zulauf et al, , 2018. The structurally highest member of the Tyros Unit is the upper part of the Upper Violet Slates, which record the lowest Alpine metamorphic overprint, lacking the high-pressure mineral carpholite (Barthelmes et al, 2004;Zulauf et al, 2002).…”

Section: Geological Settingmentioning

confidence: 99%

Back to Normal: Direct Evidence of the Cretan Detachment as a North‐Directed Normal Fault During the Miocene

2019

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The Cretan Detachment represents a major tectonic contact between an Alpine high‐pressure Lower Nappe System in the footwall and an Alpine unmetamorphosed Upper Nappe System in the hanging wall. Interestingly, the kinematics and the tectonic nature of this contact is still highly controversial and has been interpreted either as a top‐to‐the S thrust or as a normal fault with top‐to‐the N and/or top‐to‐the S displacement sense. Whereas some models suggest exhumation of the high‐pressure rocks synchronous with out‐of‐sequence thrusting or Himalayan‐type extrusion tectonics, other models propose that Crete represents a metamorphic core complex that exhumed below the extensional Cretan Detachment. In this work, we show that the Cretan Detachment in eastern Crete is an up to 100‐m‐thick cataclastic low‐angle fault zone, which localized below the Tripolitza Unit (Upper Nappe System) within the upper part of the Upper Violet Slates (top of Lower Nappe System) cutting downsection to lower structural levels. The unequivocal kinematic indicators in this fault zone clearly suggest a top‐to‐the N displacement of the hanging wall. New low‐temperature geochronological data and numerical modeling suggest rapid cooling of the rocks in the footwall of the Cretan Detachment at circa 15 Ma. Top‐to‐the S ductile shear sense toward lower structural level in the Lower Nappe System support the idea that the Cretan Detachment facilitated the exhumation of the high‐pressure rocks in an extrusion tectonic setting. Therefore, in the early to middle Miocene, subduction‐related extrusion in Crete was simultaneously active with back‐arc extension‐related metamorphic core formation in the Cyclades.

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The provenance and internal structure of the Cycladic Blueschist Unit revealed by detrital zircon geochronology, Western Cyclades, Greece

2017

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This study presents detrital zircon U‐Pb analyses of 23 samples of the Cycladic Blueschist Unit (CBU) from Kea, Kythnos, and Serifos islands, as well as the Lavrion Peninsula of SE Attica. The maximum depositional ages (MDA) and age distributions of detrital zircon U‐Pb dates are used to correlate metasediments between the islands considered herein and infer their provenance. Two distinct detrital zircon U‐Pb age distributions are found in CBU metasediments: “Proterozoic,” comprised of >40% Neoproterozoic zircons with Triassic‐Early Jurassic maximum depositional ages and “Paleozoic,” containing >30% Paleozoic zircons and yielding Late Jurassic‐Cretaceous MDAs. Proterozoic affinity metasediments are rift margin deposits derived from the northern Gondwanan margin. Paleozoic metasediments are flysch sediments most probably sourced from the Internal Hellenides. This metamorphosed flysch forms a distinct marker horizon found in a similar structural position in Lavrion, Kythnos, and Serifos. Based on lithologic correlation, sediment provenance, and MDA estimates, the CBU of Kythnos is correlative to the Lavrion Schists of Attica. On the islands of Serifos and Kythnos and within the Lavrion Schists only young‐on‐old relationships exist between rocks based on MDA estimates.

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Closure of the Paleotethys in the External Hellenides: Constraints from U–Pb ages of magmatic and detrital zircons (Crete)

Cited by 60 publications

References 70 publications

Tectono‐magmatic and Stratigraphic Evolution of the Cycladic Basement, Ios Island, Greece

Tectono‐magmatic and Stratigraphic Evolution of the Cycladic Basement, Ios Island, Greece

Back to Normal: Direct Evidence of the Cretan Detachment as a North‐Directed Normal Fault During the Miocene

The provenance and internal structure of the Cycladic Blueschist Unit revealed by detrital zircon geochronology, Western Cyclades, Greece

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