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SUMMARY:Rift initiation in a continental setting: the western Balkan perid
 otites - Uli Faul\, MIT
DTSTART:20150210T160000Z
DTEND:20150210T170000Z
UID:TALK56941@talks.cam.ac.uk
CONTACT:John Maclennan
DESCRIPTION:\nThe Dinaride and Vardar zone ophiolite belts extend from the
  south-eastern margins of the Alps to the Albanian and Greek ophiolites. D
 etailed sampling of the Krivaja–Konjuh massif\, one of the largest massi
 fs in the Dinaride belt (> 600 km2)\, reveals fertile compositions and an 
 extensive record of deformation at spinel peridotite facies conditions. Hi
 gh Na2O clinopyroxene and spinel–orthopyroxene symplectites after garnet
 \, as well as cpx trace element patterns indicate a garnet facies (subcont
 inental) origin of the southern and western parts\, similar to orogenic ma
 ssifs such as Lherz\, Ronda and the Eastern Central Alpine peridotites. In
  contrast to those massifs the peridotites from Krivaja are not refertilis
 ed. Clinopyroxene and spinel compositions from the eastern parts show simi
 larities with fertile abyssal peridotite. In the central parts of the mass
 if the spinel lherzolites contain locally abundant patches of plagioclase.
  The pyroxene abundances of the plagioclase peridotites range from similar
  to the fertile spinel peridotites to massive olivine-rich troctolites wit
 h no primary pyroxene. We infer that the olivine-rich troctolites are due 
 to migrating melt dissolving pyroxene and then freezing\, with interstitia
 l plagioclase and cpx geometries similar to experimentally produced partia
 l melts. \n\nOverall we infer that the massif represents the onset of cont
 inental rifting and early stages of formation of a new ocean basin. Combin
 ing our data with previously published analyses of other Balkan massifs we
  create a compositional map that suggests a simple tectonic setting for th
 e Balkan massifs.\n
LOCATION:Harker 1 seminar room\, Department of Earth Sciences
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