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

Kapsiotis, A. N.

doi:10.2478/agp-2014-0025

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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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Kapsiotis A. N.

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DOI

10.2478/agp-2014-0025

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Abstrakty

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# [Cr/(Cr + Al)] values that range from 0.36 to 0.42 and Mg# [Mg/(Mg + Fe²⁺)] values that vary between 0.57 and 0.62, whereas the TiO₂ content may be up to 0.47 wt.%. The serpentinite fragment is characterized by low abundances of magmaphile elements (Al₂O₃: 0.66 wt.%, CaO: 0.12 wt.%, Na₂O: 0.08 wt.%, TiO₂: 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 Al₂O₃ and MgO abundances decrease, being mainly compensated by FeO^t and Cr₂O₃ 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.

Słowa kluczowe

Ferrian chromite Cr-spinel metamorphism Ophiolites Pindos

spinel Cr metamorfizm ofiolity Pindos

Wydawca

Faculty of Geology of the University of Warsaw
Komitet Nauk Geologicznych PAN

Czasopismo

Acta Geologica Polonica

Rocznik

2014

Tom

Vol. 64, no. 4

Strony

473--494

Opis fizyczny

Bibliogr. 89 poz., il.

Twórcy

autor

Kapsiotis A. N.

kapsiotisa@yahoo.gr

Department of Geology, Section of Earth Materials, Panepistimiopolis of Rion, University of Patras, 265 04 Patras, Greece
School of Earth Science and Geological Engineering, Sun Yat-sen University, Guangzhou 510275, P. R. of China

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