The Lesvos mafic–ultramafic complex, Greece: Ophiolite or incipient rift?

Koglin, Nikola; Kostopoulos, Dimitrios; Reischmann, T.

doi:10.1016/j.lithos.2008.09.006

Cited by 50 publications

(48 citation statements)

References 58 publications

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“…To Pb/Ce ratios, the typical MORB value is ≈ 0.04 and all the samples show this feature, except PF-47A and PMB-02F samples, which have higher values suggesting contamination of the mantle source by crustal material and fluid flux in a subduction zone setting (Porter & White 2003;Rollinson 2007). The La/Nb and Th/La ratios (ranging from MORB to sediment-contaminated basaltic magmas) together with Sr/Nd ratios (indicating enrichment of the magma source caused by oceanic waters and subduction zone-derived fluids) seem to reinforce the above assumption (Thompson et al 1984;McDonough & McCulloch 1987;Metcalf et al 2000;Plank 2005;Koglin et al 2009). …”

Section: Tectonic Environmentssupporting

confidence: 53%

Lithogeochemistry of the meta-igneous units from Arroio Grande Ophiolitic Complex, southernmost Brazil

Ramos

Koester

2015

Braz. J. Geol.

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ABSTRACT:Ophiolites are defined as slices of genetically-related upper mantle serpentinized peridotites and oceanic crustal rocks, tectonically displaced from its primary igneous origin of formation by plate convergence and associated (meta) sedimentary rocks of marine origin. From this premise, a meta-ultramafic-mafic-sedimentary complex (Cr-rich magnesian schists -upper mantle or crustal ultramafic cumulate candidates; epidote amphibolites, metadiorites and metagabbros -oceanic crust candidates; metasedimentary schists, quartzites and marbles -marine sedimentary rocks candidates), located in southeastern Dom Feliciano Belt (southernmost Brazil), started to be interpreted as possible slices of an ophiolitic complex related to the closure of a paleo-ocean during Brasiliano/Pan-African orogenic cycle and was called Arroio Grande Ophiolitic Complex. The present research fills the lack of geochemical data from previous studies and tests the hypothesis of an oceanic setting for the meta-igneous units of this complex from a lithogeochemistry point of view. The meta-ultramafics were interpreted as peridotites (mantle or crustal cumulates) that were subsequently serpentinized (probably in the ocean floor) and posteriorly metasomatized (probably in a continental setting). The meta-mafics were interpreted as oceanic gabbros/basalts formed in a back-arc basin. The results, together with field relationships, rock associations and petrographic evidences, support an oceanic origin for the protoliths of the meta-igneous units. The hypothesis that these rocks represent metamorphosed slices of an ophiolitic complex is still the most reasonable one. This work updates the geologic knowledge of the area and supports discussions about the evolution of Dom Feliciano Belt and Western Gondwana paleocontinent.

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Section: Tectonic Environmentssupporting

confidence: 53%

Lithogeochemistry of the meta-igneous units from Arroio Grande Ophiolitic Complex, southernmost Brazil

Ramos

Koester

2015

Braz. J. Geol.

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“…These include, for instance, the Mt Maggiore ophiolite (Corsica, France; Rampone et al, , 2009Piccardo and Guarnieri, 2011), the western Dinarides (Serbia, Albania, and Othris, Greece; Nicolas and Jackson, 1972;Menzies and Allen, 1974;Nicolas et al, 1999;Bizimis et al, 2000;Bazylev et al, 2009), the Lesvos ophiolite in the east of the Aegean Sea (Koglin et al, 2009), the Monte del Estado massif in Puerto Rico (Marchesi et al, 2011), and -to some degree -the Trinity ophiolite (California; Quick, 1981). As noted earlier (Section 3.4.2.1.2), some lherzolite bodies exposed in ophiolitic belts may actually represent orogenic lherzolites (i.e., fragments of subcontinental mantle) embedded in the suture zones during continent-continent collision (e.g., certain lherzolite bodies from the Dinaridic ophiolitic belt in Serbia - Bazylev et al, 2009).…”

Section: Ophiolitic Lherzolites (Internal Ligurides)mentioning

confidence: 99%

Orogenic, Ophiolitic, and Abyssal Peridotites

Bodinier

Godard

2014

Treatise on Geochemistry

189

148

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“…The Samothraki mafic suite is an in situ magmatic complex comprising gabbros, sparse dykes and basalt flows and pillows cut by late dolerite dykes (Koglin 2008;Koglin et al 2009a). SHRIMP zircon geochronology of a gabbro yielded 159.9 ± 4.5 Ma (early Late Jurassic), thus precluding any correlation with the Lesvos ultramafic complex further south (253.1 ± 5.6 Ma; Latest Permian; Koglin et al 2009b). Different authors (Biggazzi et al 1989;Koglin 2008) obtained similar ages (~170-150 Ma) from gabbros of the CRB exposed in the Evros region.…”

Section: Crb Ophiolitesmentioning

confidence: 99%

“…The Lesvos ophiolite consists of thrust sheets of mantle peridotite overriding a tectonic mélange of metasediments, metabasalts and a few metagabbros (Koglin et al 2009b). Based on mineral compositions of spinel lherzolite Fig.…”

Section: Lesvos Ophiolitesmentioning

confidence: 99%

“…Based on mineral compositions of spinel lherzolite Fig. 3 Stratigraphic sections of the southern and western Eocene-Oligocene Thrace basin fill with associated palaeoflow measurements (modified after d' Atri et al 2012;Cavazza et al 2014) and harzburgites, Koglin et al (2009b) proposed that the mélange and ultramafic rocks are more typical of an incipient continental rift setting rather than of a typical ophiolite suite. The Lesvos Cr-spinels show a peculiar composition, exhibiting high Al and low Fe concentrations and moderate amounts of Cr and Mg. A typical signature for Lesvos Cr-spinel is given by low Cr# values (0.11-0.37).…”

Section: Lesvos Ophiolitesmentioning

confidence: 99%

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The Rhodope Zone as a primary sediment source of the southern Thrace basin (NE Greece and NW Turkey): evidence from detrital heavy minerals and implications for central-eastern Mediterranean palaeogeography

Caracciolo

Critelli

Cavazza

et al. 2014

Int J Earth Sci (Geol Rundsch)

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a common origin of tectonic units exposed in NW Turkey (Biga Peninsula) with those of NE Greece and SE Bulgaria (Rhodope region). The entire region displays (1) common extensional signatures, consisting of comparable granitoid intrusion ages, and a NE-SW sense of shear (2) matching zircon age populations between the metapelitic and metamafic rocks of the Circum-Rhodope Belt (NE Greece) and those of the Çamlica-Kemer complex and Çetmi mélange exposed in NW Turkey. Detrital heavy mineral abundances from Eocene-Oligocene sandstones of the southern Thrace basin demonstrate the influence of two main sediment sources mostly of ultramafic/ophiolitic and low-to medium-grade metamorphic lithologies, plus a third, volcanic source limited to the late Eocene-Oligocene. Detrital Cr-spinel chemistry is used to understand the origin of the ultramafic material and to discriminate the numerous ultramafic sources exposed in the region. Compositional and stratigraphic data indicate a major influence of the metapelitic source in the eastern part (Gallipoli Peninsula) during the initial stages of sedimentation with increasing contributions from metamafic sources through time. On the other hand, the western and more external part of the southern Thrace margin (Gökçeada, Samothraki and Limnos) displays compositional signatures according to a mixed provenance from the metapelitic and metamafic sources of the Circum-Rhodope Belt (Çamlıca-Kemer complex and Çetmi mélange). Tectonic restoration and compositional signatures provide constraints on the Palaeogene palaeogeography of this sector of the central-eastern Mediterranean region.Abstract Detrital heavy mineral analysis coupled with a regional geological review provide key elements to reevaluate the distribution of the Rhodope metamorphic zone (SE Europe) in the region and its role in determining the evolution of the Thrace basin. We focus on the Eocene-Oligocene sedimentary successions exposed in the southern Thrace basin margin to determine the dispersal pathways of eroded crustal elements, of both oceanic and continental origins, as well as their different contributions through time. Lithological aspects and tectonic data coupled with geochemistry and geochronology of metamorphic terranes exposed in the area point to Electronic supplementary material The online version of this article (

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The Lesvos mafic–ultramafic complex, Greece: Ophiolite or incipient rift?

Cited by 50 publications

References 58 publications

Lithogeochemistry of the meta-igneous units from Arroio Grande Ophiolitic Complex, southernmost Brazil

Lithogeochemistry of the meta-igneous units from Arroio Grande Ophiolitic Complex, southernmost Brazil

Orogenic, Ophiolitic, and Abyssal Peridotites

The Rhodope Zone as a primary sediment source of the southern Thrace basin (NE Greece and NW Turkey): evidence from detrital heavy minerals and implications for central-eastern Mediterranean palaeogeography

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