Mineralogy, geochemistry, structural position and a genetic model for listvenite in east of Iran

On the basis of mineralogy and geochemistry analysis, the listvenites in east of Iran are divided into three main carbonate, silica-carbonate and silica groups. Magnesite, dolomite, huntite and hydromagnesite are the major minerals in carbonate type. Silica listvenites contain mainly quartz, chalcedony and opal. Silica - carbonate listvenites contain minerals of carbonate and silica listvenites. The common structures in listvenites are vein and brecciaed type and the main textures are open space filling and colloidal. Mass balance consideration in listvenites and their host serpentinized ultramafic show that all the elements are loosed in ultramafic, are gained in listvenites. Nehbandan fault activity in east of Iran, produces suitable conduits for penetrating the meteoric water into deep levels, increase its temperature and solubility and then alteration the ultramafic unit of colored mélange during its path. Hydrothermal fluid flow-up through shear zones and wash the rocks during the path, and then under suitable condition of Eh and pH at the surface or low level open spaces of the earth, deposit its load as different types of listvenites.