Seven eclogite facies samples from lithologically different units which structurally underlie the Semail ophiolite were dated by the Ar/Ar and Rb–Sr methods. Despite extensive efforts, phengite dated by the Ar/Ar method yielded saddle, hump or irregularly shaped spectra with uninterpretable isochrons. The total gas ages for the phengite ranged from 136 to 85 Ma. Clinopyroxene–phengite, epidote–...

[1] Laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) analyses of B and Li in serpentinized peridotites from the Feather River Ophiolite (California) indicates that B is enriched in serpentine minerals compared to the whole-rock and less altered olivine grains, while Li in serpentine is depleted or comparable to whole-rock Li. The high B contents of serpentine minerals cor...

Numerous post-ophiolite intrusions exposed into the late Cretaceous–Paleocene Sabzevar ophiolite belt, northeast Iran. The intrusions consist of calc-alkaline intermediate to felsic rocks with metaluminous to peraluminous in nature and adakitic affinities. Based on U-Th-Pb dating on separated zircons by SHRIMP Ⅱ, the emplacement age of these rocks into the ophiolite zone is constrained to ~45 M...

nain ophiolite melange is located 140 km east of isfahan. based on the geological studies, this area belongs to mesozoic ophiolite of urumieh – dokhtar zone, west of central iran. country rocks are pridotite and serpentinized pridotite. the pridotite rocks are composed of harzburgite, lherzolite and replacement dunite which is belong to spinel pridotite facies.paragenesis of ore minerals are ch...

The Upper Jurassic Galice Formation and parts of its 164 to 162 Ma Josephine ophiolite basement, both of the western Klamath terrane (WKT) have been suggested to constitute lower grade equivalents of the Condrey Mountain Schist (CMS) . The high P/T CMS is exposed through a window within the Rattlesnake Creek terrane (RCT) which has been thrust westward over the WKT. The Ga lice-CMS correlation ...

The Meatiq basement, which is exposed beneath late Proterozoic nappes of supracrustal rocks in the Central Eastern Desert of Egypt, was affected by three metamorphic events. The ophiolite cover nappes show only the last metamorphic overprint. The M1 metamorphic event (T≥750 °C) is restricted to migmatized amphibolite xenoliths within the Um Ba∞anib orthogneiss in the structurally lowest parts o...

Sheeted dike complexes, in which dike intrudes dike without intermediate screens of gabbro or pillow lava, have long been considered key features of oceanic lithosphere and ophiolites formed in extensional environments. The presence of a sheeted complex implies an approximate balance between spreading rate and magma supply, such that there is just enough melt to fill newly formed fractures prod...