Ophiolitic rocks in the southeastern part of the Zagros Orogenic Belt can be separated from southwest to northeast, into two groups: the Neyriz ophiolites and the Naien–Shahrebabak–Baft ophiolites. The southeast sector of Sanandaj-Sirjan wasdelimited by the two nearly synchronous ophiolitic belts in its southwestern and northeastern margins. In this study, new ophiolitic formation models were u...

T41D-1336.Karson, J. A. (1990), Seafloor spreading on the Mid-AtlanticRidge: Implications for the structure of ophiolites and ocea-nic lithosphere produced in slow-spreading environments, in Ophiolites and Oceanic Crustal Analogues: Proceedings of the Symposium ‘‘Troodos 1987’’, edited by J. Malpas et al.,pp. 125–130, Geol. Surv. Dep., Nicosia, Cyprus.Karson, J. A., G. L. Fr...

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...

Rocks ranging in composition from trondhjemite to diorite (plagiogranites) have been recovered from ocean ridges and are common constituents of ophiolites. Velocities and densities of diorite and trondhjemite from the MidAtlantic Ridge are shown to differ significantly from similar properties of metadolerite and gabbro. Compressional (V p) and shear (V s.>velocities of plagiogranites are relati...