Two magmatic series with island arc affinities within the vourinos ophiolite

Beccaluva, Luigi; Ohnenstetter, Daniel; Ohnenstetter, M.; Paupy, A.

doi:10.1007/bf00378104

Cited by 114 publications

(69 citation statements)

References 53 publications

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“…Many authors have worked on Vourinos geological and petrological/geochemical characteristics and evidence confirms the existence of multiple magma chambers and that the harzburgites represent mantle residue, remaining after a high degree of partial melting (Moores, 1969;Jackson et al, 1975;Harkins et al, 1980;Beccaluva et al, 1984;Paraskevopoulos and Economou, 1986;Konstantopoulou and Economou-Eliopoulos, 1991). The chromite formation in dunite occurred at about 1300 o C with re-equilibration at about 600 o C (Rassios and Kostopoulos, 1990).…”

Section: Geologic Settingmentioning

confidence: 98%

Mineral Chemistry and Formation of Awaruite and Heazlewoodite in the Xerolivado Chrome Mine, Vourinos, Greece

Tzamos¹,

Filippidis²,

Michailidis³

et al. 2017

geosociety

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The Serpentinite between the chromite bodies 4 and 5 of Xerolivado mine (Vourinos, Greece), contains sparsely very small grains (<20μm) of awaruite (Fe0.91Cu0.06Co0.03Ni3), heazlewoodite (Ni2.91Fe0.06S2),. The olivine contains 0.40 wt% NiO and 6.91 (Fe0,91Cu0,06Co0,03Ni3), χεζλεγουδίτη (Ni2,91Fe0,06S2), μαγνητίτη και 79Fe2,98Co2,38S8 Περίληψη Ο σερπεντινίτης μεταξύ των χρωμιτικών σωμάτων 4 και 5 στο μεταλλείο Ξερολίβαδο (Βούρινος, Ελλάδα) περιέχει σποραδικούς πολύ μικρούς κόκκους (<20μm) αβαρουίτη

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Section: Geologic Settingmentioning

confidence: 98%

Mineral Chemistry and Formation of Awaruite and Heazlewoodite in the Xerolivado Chrome Mine, Vourinos, Greece

Tzamos¹,

Filippidis²,

Michailidis³

et al. 2017

geosociety

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“…Based chiefly on geochemical investigations (Beccaluva et al, 1984;Konstantopoullo and Economou-Eliopoulos, 1990), the Jurassic ophiolites have been proposed as supra-subduction and island arc composition.…”

Section: Vourinos Massifmentioning

confidence: 99%

On the Relatively Compositional Homogeneity of Albanian Eastern Ophiolitic Belt

Cina

2017

geosociety

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“…It represents a collisional orogenic belt formed by a series of west-trending thrust sheets and folds that verge towards the WSW . In Greece the cordillera is made up by formations that belong to the Pindos and Subpelagonian isopic zones, whereas the boundary between them is marked by ophiolite occurrences that crop out as a NNW-SSE oriented belt (e.g., Beccaluva et al 1984). Ophiolite exposures in central continental Greece occur in the form of a separate nappe, commonly referred to as the Jurassic-Early Cretaceous 'Eohellenic nappe' (Jacobshagen 1986;Text-fig.…”

Section: General Geological Settingmentioning

confidence: 99%

Alteration of mélange-hosted chromitites from Korydallos, Pindos ophiolite complex, Greece: evidence for modification by a residual high-T post-magmatic fluid

Kapsiotis¹

2014

Acta Geologica Polonica

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ABSTRACT:Kapsiotis, A.N. 2014. Alteration of mélange-hosted chromitites from Korydallos, Pindos ophiolite complex, Greece: evidence for modification by a residual high-T post-magmatic fluid. Acta Geologica Polonica, 64 (4), 473-494. Warszawa.The peridotites from the area of Korydallos, in the Pindos ophiolitic massif, crop out as deformed slices of a rather dismembered sub-oceanic, lithospheric mantle section and are tectonically enclosed within the Avdella mélange. The most sizeable block is a chromitite-bearing serpentinite showing a mesh texture. Accessory, subhedral to euhedral Cr-spinels in the serpentinite display Cr# )] values that vary between 0.57 and 0.62, whereas the TiO 2 content may be up to 0.47 wt.%. The serpentinite fragment is characterized by low abundances of magmaphile elements (Al 2 O 3 : 0.66 wt.%, CaO: 0.12 wt.%, Na 2 O: 0.08 wt.%, TiO 2 : 0.007 wt.%, Sc: 4 ppm) and enrichment in compatible elements (Cr: 2780 ppm and Ni: 2110 ppm). Overall data are in accordance with derivation of the serpentinite exotic block from a dunite that was formed in the mantle region underneath a back-arc basin before tectonic incorporation in the Korydallos mélange.Two compositionally different chromitite pods are recognized in the studied serpentinite fragment, a Cr-rich chromitite and a high-Al chromitite, which have been ascribed to crystallization from a single, progressively differentiating MORB/IAT melt. Although both pods are fully serpentinized only the Al-rich one shows signs of limited Cr-spinel replacement by an opaque spinel phase and clinochlore across grain boundaries and fractures. Modification of the ore-making Cr-spinel is uneven among the Al-rich chromitite specimens. Textural features such as olivine replacement by clinochlore and clinochlore disruption by serpentine indicate that Cr-spinel alteration is not apparently related to serpentinization. From the unaltered Cr-spinel cores to their reworked boundaries the Al 2 O 3 and MgO abundances decrease, being mainly compensated by FeO t and Cr 2 O 3 increases. Such compositional variations are suggestive of restricted ferrian chromite (and minor magnetite) substitution for Cr-spinel during a short-lived but relatively intense, low amphibolite facies metamorphic episode (temperature: 400-700 °C). The presence of tremolite and clinochlore in the interstitial groundmass of the high-Al chromitite and their absence from the Cr-rich chromitite matrix imply that after chromitite formation a small volume of a high temperature, post-magmatic fluid reacted with Cr-spinel, triggering its alteration.

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Two magmatic series with island arc affinities within the vourinos ophiolite

Cited by 114 publications

References 53 publications

Mineral Chemistry and Formation of Awaruite and Heazlewoodite in the Xerolivado Chrome Mine, Vourinos, Greece

Mineral Chemistry and Formation of Awaruite and Heazlewoodite in the Xerolivado Chrome Mine, Vourinos, Greece

On the Relatively Compositional Homogeneity of Albanian Eastern Ophiolitic Belt

Alteration of mélange-hosted chromitites from Korydallos, Pindos ophiolite complex, Greece: evidence for modification by a residual high-T post-magmatic fluid

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