THE MINDYAK PALAEOZOIC LHERZOLITE OPHIOLITE, SOUTHERN URALS: GEOCHEMISTRY AND GEOCHRONOLOGY

摘要: The Mindyak ophiolite, Southern Urals, preserves metamorphic garnet- and amphibole-bearing blocks, along with a diverse assemblage of ocean crust-derived clasts, in serpentinite tectonic breccia contact its spinel-plagioclase/spinel lherzolite mantle wehrlite/clinopyroxenite transition zone sequences. On the basis petrological geochemical data we suggest that section variably depleted lherzolites generated by two-stage process involving melting followed magma-mantle interaction supra-subduction setting. garnetiferous rocks are interpreted as high-temperature metamorphosed, rodingitized crust gabbros subsequently underwent later stage low-temperature retrogression. Previously determined radiometric U-Pb Pb-Pb dates 410–415 Ma, at Silurian-Devonian boundary, for peak event affecting metagabbros confirmed new Sm-Nd data. complex, multistage evolution garnet their preservation lherzolitic ophiolite massif give insights into processes from plate divergence formation, to convergence and, ultimately, Uralian orogeny.