Stratigraphy and tectonics of a time-transgressive ophiolite obduction onto the eastern margin of the Pelagonian platform from Late Bathonian until Valanginian time, exemplified in northern Evvoia, Greece

Scherreiks, Rudolph; Meléndez, Guillermo; BouDagher‐Fadel, Marcelle K.; Fermeli, G.; Bosence, Dan

doi:10.1007/s00531-014-1036-3

Cited by 28 publications

(57 citation statements)

References 44 publications

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“…3a). This is documented by Middle Jurassic radiolarians which have been found in the melange below the overriding ophiolite sheet (Danelian and Robertson, 2001;Scherreiks et al, 2014), showing that the ophiolite advanced over an ocean floor during Middle Jurassic time (Fig.3a). Coeval Middle Jurassic radiolarites also occur, in sedimentary contact, with basalts of the eastern Vardar ophiolite (Guevgueli Ophiolite Complex of Macedonia: Kukoc et al, 2015).…”

Section: Pliensbachian-bathonian Plate Convergence Platform Subsidenmentioning

confidence: 86%

“…Previous analyses have shown that these laterites are bauxites (Guernet and Robert, 1973). The foraminiferal assemblage of the limestones subjacent to the laterite (Table 3c) contains Pseudomarssonella bipartita Redmond (Bou Dagher-Fadel, 2008;Scherreiks et al, 2014) of Late Bathonian age, verifying that the event of emersion, during which time the laterites were deposited, must have occurred during or after the late Bathonian. The laterite is an aluminium-enriched bauxite (>71 % Al2O3) with high trace element contents of Co, Cr, Ni and V, which have been verified in the 10-500 PPM range in numerous laterite occurrences of the study area (Scherreiks et al, 2014).…”

Section: The Callovian Event: Ophiolite Obduction and Sub-aerial Expomentioning

confidence: 96%

“…The foraminiferal assemblage of the limestones subjacent to the laterite (Table 3c) contains Pseudomarssonella bipartita Redmond (Bou Dagher-Fadel, 2008;Scherreiks et al, 2014) of Late Bathonian age, verifying that the event of emersion, during which time the laterites were deposited, must have occurred during or after the late Bathonian. The laterite is an aluminium-enriched bauxite (>71 % Al2O3) with high trace element contents of Co, Cr, Ni and V, which have been verified in the 10-500 PPM range in numerous laterite occurrences of the study area (Scherreiks et al, 2014). The high aluminium content and the trace element contents of Co, Cr, Ni and V, fingerprint basalt as having been the most probable source of the lateritic deposits, definitely indicating that oceanic crust had been subaerially exposed during later Bathonian time and had undergone lateritic weathering.…”

Section: The Callovian Event: Ophiolite Obduction and Sub-aerial Expomentioning

confidence: 96%

“…Previously carried out geochemical analyses (Scherreiks et al, 2014) have shown that the gabbros and basalts conform to the calcalkaline magmatic series which is related to volcanic island-arc realms. This has also been confirmed in tectonic discrimination diagrams (Scherreiks et al, 2014). A supra-subduction, volcanic, island arc is thought to have evolved during the Middle Jurassic and is represented by the Elias Complex ( Fig.…”

Section: Pliensbachian-bathonian Plate Convergence Platform Subsidenmentioning

confidence: 99%

“…However, about 25 ma prior to the final emplacement of the ophiolite during Valanginian time, both the platform and the ophiolite became subaerially exposed during late Bathonian to early Oxfordian time. This major tectonostratigraphic event of Callovian time is the main theme of this contribution which is founded on the interpretations and re-evaluations of bio-and litho-stratigraphic-and geochemical-analyses, and field investigations (Scherreiks et al, 2014). In a regional context, this palaeogeographic conception generally corresponds to the palaeogeographic evolution that has been forwarded for the Vardar Ocean Unit of the Balkan (Robertson et al, 2013;Kukoc et al, 2015).…”

Section: Introductionmentioning

confidence: 97%

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The Callovian Unconformity and the Ophiolite Obduction Onto the Pelagonian Carbonate Platform of the Internal Hellenides

et al. 2017

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Section: Pliensbachian-bathonian Plate Convergence Platform Subsidenmentioning

confidence: 86%

Section: The Callovian Event: Ophiolite Obduction and Sub-aerial Expomentioning

confidence: 96%

Section: The Callovian Event: Ophiolite Obduction and Sub-aerial Expomentioning

confidence: 96%

Section: Pliensbachian-bathonian Plate Convergence Platform Subsidenmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

See 3 more Smart Citations

The Callovian Unconformity and the Ophiolite Obduction Onto the Pelagonian Carbonate Platform of the Internal Hellenides

et al. 2017

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The Vardar zone as a suture for the Mirdita ophiolites, Albania: Constraints from the structural analysis of the Korabi-Pelagonia zone

et al. 2015

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The Dinarides-Hellenides result from underthrusting of the Adriatic margin during Africa-Europe convergence. In Albania, they consist of (1) a western zone of nappes derived from Adria; (2) a central belt made up of the Mirdita ophiolites; and (3) an eastern zone, the Korabi-Pelagonia zone, of Variscan basement overlain by Permian to Mesozoic rift deposits and carbonates. Some authors interpret the Korabi-Pelagonia zone as a microcontinent between the Mirdita-Pindos oceanic basin to the west and the eastern Vardar oceanic basin to the east; other regard the Korabi-Pelagonia zone as a tectonic window below a single ophiolitic nappe. This contribution argues for a far-traveled thrust sheet. The Mirdita ophiolites are 165-160 Ma. The metamorphic sole yielded 40 Ar/ 39 Ar ages of 171 to 162 Ma. The Korabi-Pelagonia zone is subdivided into the Korabi and Gjegjan subzones. The structural analysis of these rocks supports the rooting of the Mirdita ophiolites in the Western Vardar zone. The post-Variscan cover sequence of the Korabi subzone records two phases of deformation: D 1 is associated with a SE dipping to flat-lying schistosity axial planar to NW verging folds and thrust faults, related to ophiolite obduction; D 2 is a postobduction NNE trending crenulation cleavage. Published zircon fission track analyses yielded 150-125 Ma, suggesting that regional metamorphism is Early Cretaceous or older. K-Ar mica ages from correlative rocks of Macedonia cluster between 148 and 130 Ma, indicating that D 1 is Late Jurassic. A west directed obduction is favored, as is a rooting east of the Mirdita ophiolites because of the top-to-the-west structural polarity of obduction-related deformation.

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Dynamics of intraoceanic subduction initiation: 1. Oceanic detachment fault inversion and the formation of supra‐subduction zone ophiolites

Maffione

Thieulot

Hinsbergen

et al. 2015

Geochem Geophys Geosyst

130

173

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Subduction initiation is a critical link in the plate tectonic cycle. Intraoceanic subduction zones can form along transform faults and fracture zones, but how subduction nucleates parallel to mid-ocean ridges, as in e.g., the Neotethys Ocean during the Jurassic, remains a matter of debate. In recent years, extensional detachment faults have been widely documented adjacent to slow-spreading and ultraslowspreading ridges where they cut across the oceanic lithosphere. These structures are extremely weak due to widespread occurrence of serpentine and talc resulting from hydrothermal alteration, and can therefore effectively localize deformation. Here, we show geochemical, tectonic, and paleomagnetic evidence from the Jurassic ophiolites of Albania and Greece for a subduction zone formed in the western Neotethys parallel to a spreading ridge along an oceanic detachment fault. With 2-D numerical modeling exploring the evolution of a detachment-ridge system experiencing compression, we show that serpentinized detachments are always weaker than spreading ridges. We conclude that, owing to their extreme weakness, oceanic detachments can effectively localize deformation under perpendicular far-field forcing, providing ideal conditions to nucleate new subduction zones parallel and close to (or at) spreading ridges. Direct implication of this, is that resumed magmatic activity in the forearc during subduction initiation can yield widespread accretion of suprasubduction zone ophiolites at or close to the paleoridge. Our new model casts the enigmatic origin of regionally extensive ophiolite belts in a novel geodynamic context, and calls for future research on three-dimensional modeling of subduction initiation and how upper plate extension is associated with that.

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Stratigraphy and tectonics of a time-transgressive ophiolite obduction onto the eastern margin of the Pelagonian platform from Late Bathonian until Valanginian time, exemplified in northern Evvoia, Greece

Cited by 28 publications

References 44 publications

The Callovian Unconformity and the Ophiolite Obduction Onto the Pelagonian Carbonate Platform of the Internal Hellenides

The Callovian Unconformity and the Ophiolite Obduction Onto the Pelagonian Carbonate Platform of the Internal Hellenides

The Vardar zone as a suture for the Mirdita ophiolites, Albania: Constraints from the structural analysis of the Korabi-Pelagonia zone

Dynamics of intraoceanic subduction initiation: 1. Oceanic detachment fault inversion and the formation of supra‐subduction zone ophiolites

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