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The Lahroud Ophiolite in northwestern Iran contains extensive zones of Paleozoic ophiolite as remnants of the Paleo-Tethys oceanic crust. The principal rock units are gabbro overlain by pillow basalt which is intruded by granites, interbedded with pelagic sedimentary units, which includes radiolarian cherts. Geochemistry and radioisotope studies, supported by Nd, Sm, Sr, and Pb isotope data indicate that the Lahroud ophiolite has been raised from a within plate basaltic mantle source. Isotope studies show that the basalts are derived from Indian type Oceanic mantle sources. Radiogenic data indicates the involvement of subduction related terrigenous materials in the source magma. All rocks are geochemically cogenetic and were generated by fractionation of a melt with a composition of average E-MORB with a calcalkaline signature. Two Ar/Ar ages of 343±3 and 187.7±7.7 Ma for the muscovite minerals and glasses respectively, suggest that metamorphic and basaltic rocks were formed during the Late Paleozoic to Early Jurassic, respectively. Microfossil studies show the presence of Paleozoic biostratigraphy. The crystallization process and rifting into the oceanic crust in the Lahroud ophiolite probably began in the Carboniferous, with volcanic activity continuing during the late Triassic.

LAHROUD A PALEO-TETHYS REMNANT IN NORTHWESTERN IRAN, IMPLICATIONS TO: GEOCHEMISTRY, RADIOISOTOPE, GEOCHRONOLOGY AND TECTONIC SETTING