Mineralogical Evidence for Partial Melting and Melt-Rock Interaction Processes in the Mantle Peridotites of Edessa Ophiolite (North Greece)

Abstract

The Edessa ophiolite complex of northern Greece consists of remnants of oceanic lithosphere emplaced during the Upper Jurassic-Lower Cretaceous onto the Palaeozoic-Mesozoic continental margin of Eurasia. This study presents new data on mineral compositions of mantle peridotites from this ophiolite, especially serpentinised harzburgite and minor lherzolite. Lherzolite formed by low to moderate degrees of partial melting and subsequent melt-rock reaction in an oceanic spreading setting. On the other hand, refractory harzburgite formed by high degrees of partial melting in a supra-subduction zone (SSZ) setting. These SSZ mantle peridotites contain Cr-rich spinel residual after partial melting of more fertile (abyssal) lherzolite with Al-rich spinel. Chromite with Cr# > 60 in harzburgite resulted from chemical modification of residual Cr-spinel and, along with the presence of euhedral chromite, is indicative of late melt-peridotite interaction in the mantle wedge. Mineral compositions suggest that the Edessa oceanic mantle evolved from a typical mid-ocean ridge (MOR) oceanic basin to the mantle wedge of a SSZ. This scenario explains the higher degrees of partial melting recorded in harzburgite, as well as the overprint of primary mineralogical characteristics in the Edessa peridotites.

An Experimental Study for the Remediation of Industrial Waste Water Using a Combination of Low Cost Mineral Raw Materials

“…Moreover, a magnesium rich sample (magnesite) has also been used to remediate pH, without being used as aggregate for industrial uses. The majority of the selected ultramafic samples were derived from the Veria-Naousa ophiolite complex, which has been intruded by Pliocene andesites [41][42][43][44]. High-quality low-carbon peat was used to adsorb heavy metals.…”

An Experimental Study for the Remediation of Industrial Waste Water Using Combination of Low Cost Mineral Raw Materials

“…Moreover, a magnesium rich sample (magnesite) has also been used to remediate pH, without being used as aggregate for industrial uses. The majority of the selected ultramafic samples were derived from the Veria-Naousa ophiolite complex, which has been intruded by Pliocene andesites [38][39][40][41]. High-quality low-carbon peat was used to adsorb heavy metals.…”

Mineral chemistry and geochemistry of serpentinites from the Bianmagou ophiolite in the North Qilian Belt, NW China: Implications for protoliths, melt extractions, and melt/fluid metasomatism

“…This further implies that the mantle underwent at least one melting event before the generation of the basalts. Moreover, (Rogkala et al, 2019).…”

“…Despite the absence of other original minerals (e.g., olivine and pyroxene), spinel can be retained in serpentinites. A general belief is that spinel has stronger stability in resisting intensive serpentinization than the majority of mafic minerals; thus, spinel is a good proxy for the petrogenesis of their host rocks (e.g., Cao, Song, Su, Jung, & Niu, 2016;Mubarak et al, 2020;Rogkala, Petrounias, Tsikouras, Giannakopoulou, & Hatzipanagiotou, 2019;Wu et al, 2018;Zhao et al, 2021). In addition, the geochemical compositions of serpentinites can be used to reflect melt/fluid metasomatism (e.g., Albers et al, 2020;Wu et al, 2018;Zhao et al, 2021).…”