Abstract
A small lensoidal garnetiferous body, consisting of garnet + amphibole + epidote + quartz, and occuring within the gneisses, amphibolites and migmatites of the eastern part of the Chalkidiki main body, is studied in terms of petrography, mineralogy and metamorphic conditions. Garnet corresponds to almandine rich almandine-grossular solid solution and displays negligible core-rim compositional variations. Garnet grains exhibit alteration to amphibole (mainly ferropargasitic hornblende and ferropargasite) and epidote. The chemical composition of garnet and amphibole imply conditions of upper amphibolite facies. It is considered that the studied garnetiferous lens may represent a retroeclogite, lacking any relic eclogitic assemblage, which completely recrystallized and equilibrated extensively under the prevalent high-T amphibolite facies. The slight enrichment of epidote in Ce, La, Y, and consequent zoning are attributed to compositional variations of the fluid phase during the amphibolitization stage.
Highlights
Varied assemblages characterized as xenoliths hosted in various lithologic environments and subjected to varied retrograde processes, have been reported in literature (e.g., Arculus and Smith, 1979; Sculze and Helmstaedt, 1979; Droop, 1983; Baker, 1986; Dodge et al, 1988; Mukhopadhyay, 1991).The present study deals with a garnetiferous lens, hosted in the metamorphic rocks of the eastern part of the Chalkidiki main body, near the village Vamvakies, in northern Greece
The contacts of the studied garnetiferous lens with the hosting rocks are not clear due to multiple deformation events, alteration and erosiono Details of the geological setting of these hosting lithologies are given in previous studies
Its mineralogieal study revealed that gamet is an almandine rich almandine-grossular solid solution, displaying negligible compositional variation across the grains and considerable alteration in amphiboleepidote intergrowths
Summary
Varied assemblages characterized as xenoliths (garnet bearing peridotites, garnet clinopyroxenites, eclogites «sensu lato», and similar mafic rocks) hosted in various lithologic environments and subjected to varied retrograde processes, have been reported in literature (e.g., Arculus and Smith, 1979; Sculze and Helmstaedt, 1979; Droop, 1983; Baker, 1986; Dodge et al, 1988; Mukhopadhyay, 1991).The present study deals with a garnetiferous lens, hosted in the metamorphic rocks of the eastern part of the Chalkidiki main body, near the village Vamvakies, in northern Greece (fig. 1). The present study deals with a garnetiferous lens, hosted in the metamorphic rocks of the eastern part of the Chalkidiki main body, near the village Vamvakies, in northern Greece The studied garnetiferous lens (about 5 x 10m in dimensions) occurs within the gneisses, amphibolites and migmatites of the area. The broader area belongs to the Serbomacedonian massif. This tectonic unit is in fault contact with the Rhodope massif to the east and the Circum Rhodope belt to the west (Kauffmann et al, 1976; Kockel et al, 1977) The Serbomacedonian massif, composed mainly of metamorphic and minor igneous rocks, is characterized by a complex tectonometamorphic evolution, which took place from preCarboniferous to post-Jurassic times (e.g., Kockel et al, 1977; Kassoli-Fournaraki, 1981; Papadopoulos, 1982; Kassoli-Fournaraki et al, 1985; De Wet et al, 1989; Sakellariou, 1989; Kourou, 1991; Sidiropoulos, 1991)
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