Fluid-rock interaction in the hydrothermal upflow zone of the Solea graben, Troodos ophiolite, Cyprus

Bettison-Varga, Lori; Schiffman, P.; Janecky, David R.

doi:10.1130/spe296-p81

Cited by 21 publications

(28 citation statements)

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“…SSZ ophiolitic rocks can also be metamorphosed or metasomatized due to hot fluids released from the subducted slab (e.g. Coleman 1977;Ishizuka 1985;Liou et al 1985;Bettison-Varga et al 1995;Manning and Bird 1995). In Greece, most ophiolitic complexes have been subjected up to medium-grade oceanic metamorphism.…”

Section: Discussionmentioning

confidence: 99%

Boninitic and tholeiitic basaltic lavas and dikes from dispersed Jurassic East Othris ophiolitic units, Greece: petrogenesis and geodynamic implications

Koutsovitis

Magganas

2016

International Geology Review

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Pillow lavas, massive lava flows, and sub-volcanic dikes of tholeiitic basaltic composition are found to be members of the Vrinena, Aerino, Eretria, and Velestino dispersed Middle-Upper Jurassic ophiolitic units in East Othris. The Vrinena and Eretria ophiolitic units appear to have been emplaced onto the Pelagonian continental margin during the Upper Jurassic-Lower Cretaceous, whereas the Aerino and Velestino units seem to have been finally emplaced during postPalaeocene times. Geochemically these are divided into two groups: Group I includes subduction-related boninites and low-Ti basalts from the Vrinena and Aerino units, and Group II high-Ti basalts show spreading-type characteristics occurring in the Eretria and Velestino units. Primary magma of the Group I volcanics appears to have been formed after high partial melting degrees (~18%) of a highly depleted harzburgitic mantle source, under relatively high temperatures (mantle potential temperature~1372°C). Petrogenetic modelling also suggests that the primary magma of the Group II volcanics were formed after lower partial melting degrees (~7%) of a moderately depleted mantle source. The petrological and geochemical data from the East Othris dispersed and diversely emplaced ophiolitic units provide evidence of a common intra-oceanic supra-subduction zone (SSZ) origin within the Pindos oceanic strand of the Western Tethys. Specifically, Group I lavas and dikes from Vrinena seem to represent the extrusive part of an almost complete fore-to island-arc ophiolitic sequence. Dikes of Aerino most likely correspond to fore-arc magmatic material that intruded within exhumed serpentinized ultramafic rocks through a subduction channel that developed close to the slab and towards the fore-arc and the accretionary prism. The Group II volcanics either corresponded to a fore-arc magmatic expression, which extruded earlier than Group I volcanics and prior to the establishment of a mature subduction zone, or represent back-arc to island-arc magmatism that was contemporaneous to the fore-arc magmatic activity during rollback subduction. ARTICLE HISTORY

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Section: Discussionmentioning

confidence: 99%

Boninitic and tholeiitic basaltic lavas and dikes from dispersed Jurassic East Othris ophiolitic units, Greece: petrogenesis and geodynamic implications

Koutsovitis

Magganas

2016

International Geology Review

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“…7). Epidotisation of sheeted dykes is usually attributed to the effect of modified seawater (Richards et al 1989;Bettison-Varga et al 1995), but it is unlikely in this particular case due to the differing REE patterns of the epidotes from this sample. A more likely explanation is that the fluids responsible for epidote growth originated from the plutonic complex, and more specifically from a fluid saturated crystallising plagiogranite body: The sampling location is adjacent to a large plagiogranite body in the plutonic complex of the Troodos ophiolite.…”

Section: Hydrothermal Fluid Flow and Migrationmentioning

confidence: 89%

Rare earth element evolution and migration in plagiogranites: a record preserved in epidote and allanite of the Troodos ophiolite

Anenburg

Katzir

Rhede

et al. 2015

Contrib Mineral Petrol

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causing crystallisation of allanite-(Y) from hydrothermal fluids in the miarolites. The REE pattern of the hydrothermal allanite-(Y) is characterised by LREE and Eu depletion, similar to the parent plagiogranitic magma. As allanite had sequestered most of the REE in the fluid, epidote took over as the principle hydrothermal mineral. Epidote in Troodos plagiogranites records a fluid evolutionary trend beginning with REE-rich-Eu-depleted similar to allanite-(Y) and gradually transforming into the REE-depletedEu-enriched pattern prevalent throughout 'conventional' sub-seafloor fluids. A comparison of allanite-bearing and allanite-absent plagiogranites from the same locality suggests that REE-bearing fluids migrated from the plagiogranites. Similar fluid evolution trends observed in diabase-hosted epidote, located adjacent to a large plagiogranite body, suggest influx of plagiogranite-derived REEbearing fluids. Epidotisation in oceanic settings is usually considered to be the result of alteration by high fluxes of seawater-derived hydrothermal fluids. Although epidotisation by magmatic fluids has been suggested to occur in plagiogranites, our study shows that this autometasomatic process is the dominant mechanism by which epidosites form in plagiogranites. Furthermore, epidotisation of diabase has been attributed solely to seawater-derived fluids, but we show that it is possible for diabase-hosted epidosites to form by migration of plagiogranite-derived fluids.

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“…The major element chemistry of rocks from epidosite zones shows the wide range in composition expected from the changing mineralogy (Richardson et al 1987;Harper et al 1988;Nehlig et al 1994;Bettison-Varga et al 1995). All of the rocks within epidosite zones, including the whole range from diabase to epidosite, are strongly depleted in Cu, Zn and Mn by between 50% and 90%, with Cu the most depleted and Mn the least (Richardson et al 1987;Harper et al 1988;Nehlig et al 1994;Bettison-Varga et al 1995). Jowitt et al (2012) (Bickle & Teagle 1992;Bickle et al 1998).…”

Section: Epidosite Zones: Previous Workmentioning

confidence: 99%

“…Recent alteration of diabase in ODP Hole 504B is much less intense than that seen in Troodos . Fluid inclusions within the epidosite zones, including all rock types, show homogenization temperatures broadly within the range 250-400°C, and salinities typically ranging from sea water to twice sea water concentrations (Richardson et al 1987;Nehlig et al 1994;Bettison-Varga et al 1995;Juteau et al 2000). Oxygen isotopes give evidence of extensive water-rock reaction at similar temperatures (Harper et al 1988;Schiffman & Smith 1988;Nehlig et al 1994;FonnelandJorgensen et al 2005).…”

Section: Epidosite Zones: Previous Workmentioning

confidence: 99%

Rapid generation of reaction permeability in the roots of black smoker systems, Troodos ophiolite, Cyprus

Cann

McCaig²,

Yardley³

2012

Crustal Permeability

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Fluid-rock interaction in the hydrothermal upflow zone of the Solea graben, Troodos ophiolite, Cyprus

Cited by 21 publications

References 0 publications

Boninitic and tholeiitic basaltic lavas and dikes from dispersed Jurassic East Othris ophiolitic units, Greece: petrogenesis and geodynamic implications

Boninitic and tholeiitic basaltic lavas and dikes from dispersed Jurassic East Othris ophiolitic units, Greece: petrogenesis and geodynamic implications

Rare earth element evolution and migration in plagiogranites: a record preserved in epidote and allanite of the Troodos ophiolite

Rapid generation of reaction permeability in the roots of black smoker systems, Troodos ophiolite, Cyprus

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