Using secondary minerals in Sahneh ophiolitic complex, west Iran

Kermanshah ophiolite is an extremely crushed ophiolitic complex in which a complete ophiolitic sequence is not observed. Gabbros, deloritc dikes and mostly serpentinized peridotites are among the most important constituents of these ophiolitic set. Pridotites existing in the study area are of metamorphosized types that have been severely affected by the hydrothermal solutions due to their extremely crushed conditions and have tolerated almost a severe alteration. Such decompositions and destructions result in creation of secondary minerals of the serpentine group (lizardite, chrysotile, antigorite), clorite, talc, magnesite, iddingsite and brusite). A survey of the secondary minerals existing in the pridotites show that the study area has been undergone a low temperature metasomatism at the green schist face level and then the region temperature has risen up to the amphibiolitic face level due to metamorphosization. In this paper the conditions and the reactions relating to the formation procedure of any of the above said minerals have been surveyed.