High-pressure subduction-related serpentinites and metarodingites from East Thessaly (Greece): Implications for their metamorphic, geochemical and geodynamic evolution in the Hellenic–Dinaric ophiolite context

Koutsovitis, Petros

doi:10.1016/j.lithos.2016.11.008

Cited by 21 publications

(15 citation statements)

References 165 publications

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“…The chemical signature of diopside relics dominated by very high Ca and Mg contents is in agreement with diopside compositions from rodingites around the world, e.g., [38][39][40] and confirms its metasomatic origin. As the diopside (possibly with older grossular cores) is considered to be the oldest mineral phase, there are no indications allowing us to discuss the protolith of the rock, although the most often reported protoliths around the world are various mafic magmatic rocks commonly associated with serpentinized bodies, e.g., [3,5,41]. No primary (magmatic) minerals were identified, and contrary to the mineralogy described by Putiš et al [32], we did not observe Fe-Ti oxides.…”

Section: Mineralogical Evolutionmentioning

confidence: 99%

“…In any case, the vesuvianite tends to form at later stages of the rodingitization process and thus represents a higher extent of metasomatic transformation [4,5,12,42,46]. This mineral is abundant in rodingites affected by intense metamorphism [41,42,44,49], but numerous descriptions of rodingites lacking vesuvianite are equally frequent [6,10,39,[50][51][52][53][54][55]. As it is stable over a wide range of temperatures [42,47], the key factor controlling the crystallization of vesuvianite is still not evident and more research is needed on this subject.…”

Section: Mineralogical Evolutionmentioning

confidence: 99%

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Garnet-Vesuvianite Equilibrium in Rodingites from Dobšiná (Western Carpathians)

2021

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Intensively metasomatized rocks from serpentinized ultramafic tectonic fragments in Dobšiná, Western Carpathians, consist of typical rodingite mineral association: hydrated garnet, vesuvianite, diopside and clinochlore. Electron microprobe analysis (EMPA) and Micro-Raman analyses of the main minerals evidence complex mineralogical evolution and variable mineral chemistry. Garnet solid solution is dominated by grossular-andradite series, which demonstrates a significant degree of hydration, mainly for grossular rich garnet cores. Garnet is locally enriched in TiO2 (up to 13 wt%), possibly indicating a chemical relic of a Ti-oxide mineral. Younger, andradite-richer garnet rims demonstrate a low degree of hydration, suggesting a harder incorporation of an (OH)− anion into its crystal structure. Garnet chemical variations display an ideal negative correlation between Al and (Fe3+ + Ti). The most recent mineral phase is represented by euhedral vesuvianite (± chlorite), which crystallizes at the expense of the garnet solid solution. This reaction shows a well-equilibrated character and indicates a high extent of rodingitization process. Chlorite thermometry models suggest an average temperature of late rodingite (trans) formation of about 265 °C.

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Section: Mineralogical Evolutionmentioning

confidence: 99%

Section: Mineralogical Evolutionmentioning

confidence: 99%

Garnet-Vesuvianite Equilibrium in Rodingites from Dobšiná (Western Carpathians)

2021

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“…The ophiolite units of two Greek islands, Evia and Lesvos, comprise of amphibolitesm, and below them lie ultramafic masses that consist of serpentinized harzburgites, patches of dunites and serpentinized depleted iherzolites and harzburgites, respectively [93]. A study that was conducted in the east part of Thessaly, Central Greece showed that the metaophiolites of this region consisted mainly of serpentinites and metabasites [94] The Pindos ophiolite complex in NW Greece is mainly comprised of large harzburgite-dunite masses > 1000 km 2 in the mantle peridotites [95][96][97]. Among the Western Hellenic Ophiolites is Vourinos ophiolite complex in Western Macedonia, NW Greece, represents a mid-Jurassic complete lithospheric slab about 12 km thick and 400 km 2 and consist of depleted harzburgite mantle which hosts bodies of dunite ranging in size from several meters to kilometers in scale length [8,96,[98][99][100].…”

Section: Co 2 Storage In Greecementioning

confidence: 99%

Carbon Capture and Storage: A Review of Mineral Storage of CO2 in Greece

Kelektsoglou

2018

Sustainability

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As the demand for the reduction of global emissions of carbon dioxide (CO2) increases, the need for anthropogenic CO2 emission reductions becomes urgent. One promising technology to this end, is carbon capture and storage (CCS). This paper aims to provide the current state-of-the-art of CO2 capure, transport, and storage and focuses on mineral carbonation, a novel method for safe and permanent CO2 sequestration which is based on the reaction of CO2 with calcium or magnesium oxides or hydroxides to form stable carbonate materials. Current commercial scale projects of CCS around Europe are outlined, demonstrating that only three of them are in operation, and twenty-one of them are in pilot phase, including the only one case of mineral carbonation in Europe the case of CarbFix in Iceland. This paper considers the necessity of CO2 sequestration in Greece as emissions of about 64.6 million tons of CO2 annually, originate from the lignite fired power plants. A real case study concerning the mineral storage of CO2 in Greece has been conducted, demonstrating the applicability of several geological forms around Greece for mineral carbonation. The study indicates that Mount Pindos ophiolite and Vourinos ophiolite complex could be a promising means of CO2 sequestration with mineral carbonation. Further studies are needed in order to confirm this aspect.

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“…Rodingitization of ultramafic protoliths has also been assigned to autometasomatic postmagmatic processes, due to clinopyroxene breakdown [3,10]. Formation of rodingites in fore arc settings is facilitated by fore arc exhumation processes due to progressive serpentinization of the mantle wedge [11,12].…”

Section: Introductionmentioning

confidence: 99%

Multiple Rodingitization Stages in Alkaline, Tholeiitic, and Calc-Alkaline Basaltic Dikes Intruding Exhumed Serpentinized Tethyan Mantle from Evia Island, Greece

et al. 2022

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In Pagondas and Kimi areas, central Evia Island, Greece, variably serpentinized ultramafic rocks of an ophiolitic origin are crosscut by rodingite dikes. Based on their protoliths, these rodingites are distinguished into the following: (i) rodingites of island arc tholeiitic dolerites, (ii) rodingites of Mg-rich tholeiitic gabbros, (iii) rodingites of alkaline basalts, and (iv) rodingites of calc-alkaline basalts. Rodingitization evolved in three successive phases (namely, stages 1, 2, and 3) of increasing metasomatic degree that occurred during the exhumation of the mantle wedge serpentinites. Thermodynamic modeling suggests that stage 1 was developed at ~5 kbar and 450-550°C, whereas at stage 2 and stage 3, gradually decreasing P-T conditions prevailed. Stage 1 affected the protoliths of all rodingite types and was characterized by the crystallization of grossular, diopside, chlorite, and prehnite leading to Ca and LOI enrichments. The observed Si and REE depletions are assigned to the dissolution of primary clinopyroxene and amphibole. Stage 2 mainly affected the rodingites that were derived from alkaline and calc-alkaline basalts, promoting the growth of andradite, vesuvianite, and chlorite at the expense of stage 1 rodingitization mineral phases. At this stage, the marginal zones of rodingite dikes from alkaline and calc-alkaline basalts experienced remarkable Mg and REE enrichments. Stage 3 corresponds to derodingitization and restricted carbonation processes of the previously formed rodingites, which are associated with Fe enrichments. During this stage, significant trace elements including REEs were transferred from the marginal zones to the inner cores of rodingite dikes that were derived from metasomatism of calc-alkaline basalts. Calcite δ18Ο-δ13C isotopic data suggest that carbonation processes were developed at shallow depths below the Tethyan ocean floor, through mixing of seawater and serpentinization-derived fluids. Such multiple stages of rodingitization processes that affected four different lithotypes, as well as the unusual case of alkaline basalts’ rodingitization, would render the Evia rodingites as an important and very rare example of metasomatism.

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High-pressure subduction-related serpentinites and metarodingites from East Thessaly (Greece): Implications for their metamorphic, geochemical and geodynamic evolution in the Hellenic–Dinaric ophiolite context

Cited by 21 publications

References 165 publications

Garnet-Vesuvianite Equilibrium in Rodingites from Dobšiná (Western Carpathians)

Garnet-Vesuvianite Equilibrium in Rodingites from Dobšiná (Western Carpathians)

Carbon Capture and Storage: A Review of Mineral Storage of CO2 in Greece

Multiple Rodingitization Stages in Alkaline, Tholeiitic, and Calc-Alkaline Basaltic Dikes Intruding Exhumed Serpentinized Tethyan Mantle from Evia Island, Greece

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