Rodingite formation from diorite in the Samothraki ophiolite, NE Aegean, Greece

Hatzipanagiotou, Konstantin; Tsikouras, Basilios

doi:10.1002/gj.887

Cited by 32 publications

(24 citation statements)

References 33 publications

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“…The metasedimentary rocks are generally suggested to be Late Jurassic to Early Cretaceous in age (for detailed discussion see HEIMANN 1967). They were deposited in a trench, deformed in an accretionary wedge, and later intruded by subduction-related mafic rocks (TSIKOURAS et al 1990) or accumulated in a continental-rift setting (HATZIPANAGIOTOU & TSIKOURAS 2001). TSIKOURAS et al (1990) suggested that the Basement Unit has been partly contact-metamorphosed by the Ophiolite Unit (= Samothraki ophiolite).…”

Section: Geological Settingmentioning

confidence: 99%

“…1). The Samothraki ophiolite consists mainly of gabbro, basalt, dolerite and diorite (e. g. TSIKOURAS & HATZIPANAGIOTOU 1998;HATZIPANAGIOTOU & TSIKOURAS 2001). Rare pots of plagiogranite can be also found.…”

Section: Geological Settingmentioning

confidence: 99%

“…The Samothraki ophiolite is generally considered to be subautochthonous, originated in an ensialic back-arc basin, including mid-ocean ridge basalt (MORB) and island-arc tholeiite (IAT) affinities (e.g. TSIKOURAS et al 1990;TSIKOURAS & HATZIPANAGIOTOU 1998;HATZIPANAGIOTOU & TSIKOURAS 2001). K-Ar hornblende ages of 154 ± 7 and 155 ± 7 Ma for diorite samples were interpreted as intrusion ages (TSIKOURAS et al 1990).…”

Section: Geological Settingmentioning

confidence: 99%

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Geochemistry and biostratigraphy of Eocene sediments from Samothraki Island, NE Greece

Meinhold¹,

BouDagher‐Fadel²

2010

njgpa

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Elevated whole-rock concentrations in Cr, Ni and V as well as the occurrence of detrital chrome spinel suggest an input of (ultra)mafic detritus into the Eocene clastic sediments of Samothraki Island. Detrital chrome spinel chemistry indicates a mixed source of MOR-type peridotites and supra-subduction zone (SSZ) peridotites, and minor volcanic rocks, supposedly island-arc basalts and MORB-type rocks, most likely derived from Vardarian ophiolites. Wackestones from the southwest of Samothraki contain a moderately well-preserved calcareous microfossil assemblage, comprising Nummulites fabianii (PREVER), Nummulites striatus (BRUGUIÈRE), Pellatispira sp., and Operculina sp., indicating an early Priabonian age (Late Eocene). The sedimentation of the Eocene succession was influenced by regional tectonic and volcanic activity. The rocks have been deposited contemporaneous with the extensional exhumation of the eastern Rhodope Massif.

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Section: Geological Settingmentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

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Geochemistry and biostratigraphy of Eocene sediments from Samothraki Island, NE Greece

Meinhold¹,

BouDagher‐Fadel²

2010

njgpa

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“…Fluids influenced by serpentinization reactions are known from mid-ocean ridge settings (Kelley et al 2001(Kelley et al , 2005Charlou et al 2002;Schmidt et al 2007), ophiolites (Feth et al 1961;Barnes et al 1967;Neal and Stanger 1983;Abrajano et al 1988), and forearc regions of subduction zones (Mottl et al 2003(Mottl et al , 2004. Rodingites have been found in a range of tectonic settings, including seafloor spreading centers (Aumento and Loubat 1971;Honnorez and Kirst 1975;Bideau et al 1991;Hekinian et al 1993), rifted continental margins (Beard et al 2002), and ophiolites (Barriga and Fyfe 1983;Hatzipanagiotou and Tsikouras 2001;Austrheim and Prestvik 2008;Iyer et al 2008). Rodingitization is a metasomatic process, and the dominant mass transfers involved are removal of silica and addition of Ca (Coleman 1967).…”

Section: Rodingitization Of Gabbro During Serpentinization Of Abyssalmentioning

confidence: 99%

Metasomatism Within the Ocean Crust

Bach

Jöns

Klein

2012

Lecture Notes in Earth System Sciences

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From ridge to trench, the ocean crust undergoes extensive chemical exchange with seawater, which is critical in setting the chemical and isotopic composition of the oceans and their rocky foundation. Although the overall exchange fluxes are great, the first-order metasomatic changes of crustal rocks are generally minor (usually <10% relative change in major element concentrations). Drastic fluid-induced metasomatic mass transfers are limited to areas of very high fluid flux such as hydrothermal upflow zones. Epidotization, chloritization, and serizitization are common in these upflow zones, and they often feature replacive sulfide mineralization, forming significant metal accumulations below hydrothermal vent areas. Diffusional metasomatism is subordinate in layered (gabbroicdoleritic-basaltic) crust, because the chemical potential differences between the different lithologies are minor. In heterogeneous crust (mixed mafic-ultramafic lithologies), however, diffusional mass transfers between basaltic lithologies and peridotite are very common. These processes include rodingitization of gabbroic dikes in the lithospheric mantle and steatitization of serpentinites in contact to gabbroic intrusions. Drivers of these metasomatic changes are strong across-contact differences in the activities of major solutes in the intergranular fluids. Most of these processes take place under greenschist-facies conditions, where the differences in silica and proton activities in the fluids are most pronounced. Simple geochemical reaction path models provide a powerful tool for investigating these processes. Because the oceanic crust is hydrologically active throughout much of its lifetime, the diffusional metasomatic zones are commonly also affected by fluid flow, so that a clear distinction between fluid-induced and lithology-driven

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“…Another mechanism involves Si, alkalis, and Mg loss from a mafic protolith during and/or after serpentinization of the adjacent ultramafic rock, as opposed to Ca addition to the protolith (e.g. Hatzipanagiotou & Tsikouras ; Li et al . ; Frost & Beard ; Frost et al .…”

Section: Introductionmentioning

confidence: 99%

The formation of rodingite in the Nagasaki metamorphic rocks at Nomo Peninsula, Kyushu, Japan – Zircon U–Pb and Hf isotopes and trace element evidence

et al. 2014

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Rodingites occur in serpentine-matrix mélange of the Nagasaki metamorphic rocks in Japan. Two types of rodingites can be distinguished on the basis of their mode of occurrence and mineralogical composition. One occurs as dikes, which contain a mineral assemblage of grossular, vesuvianite, diopside, apatite, titanite, and zircon. The other occurs as a block, which consists of zoisite, clinozoisite, diopside, chlorite, apatite, titanite, and zircon. The former type of rodingites posses two types of zircons: prismatic and porous. The prismatic zircons contain primary fluid inclusions indicating their crystallization in the presence of fluids. The porous zircons have extensive fractures filled by zircon, which are indicative of a hydrothermal origin. Both zircon types were thought to have formed under the influence of fluids. U-Pb ion probe analyses of prismatic zircons from the rodingites yield a weighted mean age of 108-105 Ma, suggesting the Early Cretaceous as the time of rodingitization in the subduction zone. Hafnium isotopic compositions of prismatic zircons are close to or overlap with the mid ocean ridge basalt (MORB) Hf isotopic ratio. This indicates that the fluid composition may have been reflected by the MORB composition during rodingitization. On the other hand, the low ε Hf values (11.8-18.9) of porous zircons suggest that they incorporate a small amount of Hf from fluid contaminated by subducted sediments. The rodingites are significantly enriched in Sr and depleted in large ion lithophile elements (LILE) (Cs, Rb, Ba). The fluid during rodingitization is able to extracts LILEs from the protolith of rodingites and adds Sr to the protolith of rodingites. The high field strength elements (HFSE) (Zr, Th, U, Nb, Ta) concentrations in the rodingites are similar to those of MORB, thus indicate their relatively immobile nature during rodingitization.

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Rodingite formation from diorite in the Samothraki ophiolite, NE Aegean, Greece

Cited by 32 publications

References 33 publications

Geochemistry and biostratigraphy of Eocene sediments from Samothraki Island, NE Greece

Geochemistry and biostratigraphy of Eocene sediments from Samothraki Island, NE Greece

Metasomatism Within the Ocean Crust

The formation of rodingite in the Nagasaki metamorphic rocks at Nomo Peninsula, Kyushu, Japan – Zircon U–Pb and Hf isotopes and trace element evidence

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