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

Authors

  • Jane H. Scarrow present address: Department of Mineralogy and Petrology, Campus Fuente Nueva, 18002 Granada, Spain
  • Galina N. Savelieva Geological Institute, Russian Academy of Sciences, Pyzhevski per. 7, 109017 Moscow, Russia
  • Johannes Glodny present address: GeoForschungsZentrum, Potsdam, Telegrafenberg C2, D-14473 Germany
  • Pilar Montero Dept. of Mineralogy and and Petrology, Campus Fuentenueva, E-18002 Granada, Spain
  • Alexei N. Pertsev Geological Institute, Russian Academy of Sciences, Pyzhevski per. 7, 109017 Moscow, Russia
  • Luciano Cortesogno Dept. of Earth Sciences, Corso Europa 26, I-16132 Genoa, Italy
  • Laura Gaggero Dept. of Earth Sciences, Corso Europa 26, I-16132 Genoa, Italy

DOI:

https://doi.org/10.4454/ofioliti.v24i2.104

Keywords:

Abstract

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

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Published

1999-07-01

How to Cite

Scarrow, J. H., Savelieva, G. N., Glodny, J., Montero, P., Pertsev, A. N., Cortesogno, L., & Gaggero, L. (1999). THE MINDYAK PALAEOZOIC LHERZOLITE OPHIOLITE, SOUTHERN URALS: GEOCHEMISTRY AND GEOCHRONOLOGY. Ofioliti, 24(2), 239-246. https://doi.org/10.4454/ofioliti.v24i2.104

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