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

Scherreiks, Rudolph; Meléndez, Guillermo; Bouldagher-Fadel, M.; Fermeli, G.; Bosence, Dan

doi:10.12681/bgsg.11713

Cited by 7 publications

(15 citation statements)

References 7 publications

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“…The platform subsided during the Middle Jurassic, verified by ever deepening carbonate facies (Scherreiks 2000), and then became emergent during Callovian time, verified by bauxite deposits (Fig. 4a) (Scherreiks et al 2016). The age of this Callovian upheaval has been verified with Bathonian foraminifera in the limestones below, and Oxfordian foraminifera above the bauxite crusts (Table 1a 5 and 6) (ibid.).…”

Section: The Pelagonian Carbonate Platform and Its Involvement In The Demise Of The Vardar Oceanmentioning

confidence: 80%

“…2b) and across the western Adria (BouDagher-Fadel and Bosence 2007). The platform evolved adjacent to the west side of the Vardar ocean during the Late Triassic through the Early Jurassic from a cyclically alternating supratidal to a peritidal domain (Scherreiks 2000;Bosence et al 2009) and then responded with subsidence and episodes of upheaval as continental Adria and the Vardar ocean converged (Scherreiks et al 2010(Scherreiks et al , 2014(Scherreiks et al , 2016. (Table 1a documents biostratigraphic data concerning the Pelagonian carbonate platform of Evvoia and the Northern Sporades, which will be referred to in the text.…”

Section: The Carbonate Platforms Of Adria and The Vardar Zonementioning

confidence: 99%

“…The Elias formation has been interpreted as a relict of a suprasubduction island arc complex (Scherreiks et al 2014). Bauxite was deposited during the Callovian (Scherreiks et al 2016) (Table 1a 5 and 6 Mercier andVergely 1988 and1984;Katrivanos et al 2013;Georgiadis et al 2016 1a Carnian-Norian).…”

Section: Figure Captionsmentioning

confidence: 99%

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The closure of the Vardar ocean (the western domain of the northern Neotethys) from early Middle Jurassic to Paleocene time, based on surface geology of eastern Pelagonia and the Vardar zone, biostratigraphy, and seismic-tomographic images of the mantle below the Central Hellenides

Scherreiks

BouDagher‐Fadel

2021

Preprint

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Seismic tomographic images of the mantle below the Hellenides indicate that the Vardar ocean probably had a composite width of over 3000 kilometres. From surface geology we know that this ocean was initially located between two passive margins: Pelagonian Adria in the west and Serbo-Macedonian-Eurasia in the east. Pelagonia was covered by a carbonate platform that accumulated, during Late Triassic to Early Cretaceous time, where highly diversified carbonate sedimentary environments evolved and reacted to the adjacent, converging Vardar ocean plate. We conceive that on the east side of the Vardar ocean, a Cretaceous carbonate platform evolved from Aptian to Maastrichtian time in the forearc basin of the Vardar supra-subduction volcanic arc complex. The closure of the Vardar ocean occurred in one episode of ophiolite obduction and in two episodes of intra-oceanic subduction.

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Section: The Pelagonian Carbonate Platform and Its Involvement In The Demise Of The Vardar Oceanmentioning

confidence: 80%

Section: The Carbonate Platforms Of Adria and The Vardar Zonementioning

confidence: 99%

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The closure of the Vardar ocean (the western domain of the northern Neotethys) from early Middle Jurassic to Paleocene time, based on surface geology of eastern Pelagonia and the Vardar zone, biostratigraphy, and seismic-tomographic images of the mantle below the Central Hellenides

Scherreiks

BouDagher‐Fadel

2021

Preprint

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“…2b) and across the western Tethys (BouDagher-Fadel and Bosence 2007). The platform evolved adjacent to the west side of the Vardar ocean during the Late Triassic through the Early Jurassic from a cyclically alternating supratidal to a peritidal domain (Scherreiks 2000;Bosence et al 2009) and then responded with subsidence and episodes of upheaval as continental Adria and the Vardar ocean converged (Scherreiks et al 2010(Scherreiks et al , 2014(Scherreiks et al , 2016. (Table 1a documents biostratigraphic data concerning the Pelagonian carbonate platform of Evvoia and the Northern Sporades, which will be referred to in the text.…”

Section: The Carbonate Platforms Of Adria and The Vardar Zonementioning

confidence: 99%

“…The Elias formation has been interpreted as a relict of a suprasubduction island arc complex (Scherreiks et al 2014). Bauxite was deposited during the Callovian (Scherreiks et al 2016) (Table 1a 5 and 6). The eastern part of section a) shows overthrust, supposed Vardar, Cretaceous platform carbonates and mylonitized ocean floor mélange (devoid of serpentinite).…”

Section: Figure Captionsmentioning

confidence: 99%

The closure of the Vardar ocean (the western domain of the northern Neotethys) from early Middle Jurassic to Paleocene time, based on surface geology of eastern Pelagonia and the Vardar zone, biostratigraphy, and seismic-tomographic images of the mantle below the Central Hellenides

Scherreiks

BouDagher‐Fadel

2021

Preprint

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Petrology and Tectonic Significance of Epidote Blueschist-Facies Rocks from the Northern Margin of the Pelagonian Unit in the Republic of North Macedonia

Altherr

Hanel

Soder

et al. 2023

Journal of Petrology

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In the Republic of North Macedonia, the northern marginal part of the Pelagonian Unit comprises several isolated slivers of low-grade blueschist-facies rocks. These rocks were metamorphosed at conditions of the epidote-blueschist facies with rare transitions to the lawsonite-epidote blueschist facies. If present, lawsonite occurs as relic inclusions in albite, suggesting a local metasomatic enrichment of Na. No aragonite or fibrous calcite was detected, suggesting that the rocks were equilibrated at pressures below the aragonite-calcite boundary. When present, calcite + quartz coexist with glaucophane, epidote, and titanite suggesting the presence of a metamorphic H2O-rich fluid phase with very low XCO2 values (< 0.002). Most samples contain chlorite and only some have garnet, which is nearly free of Mg, but contains an andradite component. Albite only occurs in garnet-free rocks. A core-to-rim decrease of Fe3+/(Fe3++Al3++Cr + Mn3+) in epidote, VIFe3+/VI(Fe3++Al) in blue Na-rich amphibole, and Fe3+/(Fe2++Fe3+) in garnet grains suggest a decrease of ƒO2 during metamorphism. The general absence of magnetite and the presence of very small amounts of hematite in some samples suggest that the hematite–magnetite buffer curve was probably not crossed. It is thought that the investigated blueschist-facies rocks were part of the once highly oxidized sedimentary cover of the subducting oceanic plate. The underlying basaltic crust and oceanic mantle, however, were probably relatively reduced. Aqueous fluids which left this part of the lithosphere during subduction (dehydration) partially reduced the overlying oxidized metasediments. Concerning metamorphic P–T conditions, a pressure range of 0.7–0.9 GPa is defined by the presence of glaucophane + epidote + quartz at the lower boundary and the absence of aragonite at the higher boundary. The temperature range of 320–420°C is defined by the absence of Fe-Mg-pumpellyite at the lower side and the presence of lawsonite + albite at the higher side. These conditions can be narrowed down by using calculated equilibrium mineral assemblage diagrams (pseudosections) for three different bulk-rock compositions, resulting in P = 0.74–0.85 GPa and T = 340–370°C. It must, however, be emphasized that many phases (garnet, glaucophane, epidote, and phengite) show significant chemical zonation, which makes the use of pseudosections problematic.

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

Abstract: The carbonate -platform-complex

Cited by 7 publications

References 7 publications

The closure of the Vardar ocean (the western domain of the northern Neotethys) from early Middle Jurassic to Paleocene time, based on surface geology of eastern Pelagonia and the Vardar zone, biostratigraphy, and seismic-tomographic images of the mantle below the Central Hellenides

The closure of the Vardar ocean (the western domain of the northern Neotethys) from early Middle Jurassic to Paleocene time, based on surface geology of eastern Pelagonia and the Vardar zone, biostratigraphy, and seismic-tomographic images of the mantle below the Central Hellenides

The closure of the Vardar ocean (the western domain of the northern Neotethys) from early Middle Jurassic to Paleocene time, based on surface geology of eastern Pelagonia and the Vardar zone, biostratigraphy, and seismic-tomographic images of the mantle below the Central Hellenides

Petrology and Tectonic Significance of Epidote Blueschist-Facies Rocks from the Northern Margin of the Pelagonian Unit in the Republic of North Macedonia

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