pb-zn deposits in the kurdistan region, northern iraq, have occurred mainly as a stratabound and open-space filling ore bodies. they are hosted by dolostone and dolomitic-limestone of platform carbonates. the ore deposits at the studied dure and lefan areas are respectively hosted by kurra chine (upper triassic) and bekhme (upper cretaceous) formations. pyrite, sphalerite and galena are the maj...

The discordance of U–Th–Pb isotopic systems in geochronometers, and how such data are interpreted, still major issues the geosciences. To better understand disturbance systems, this impacts derivation geologically-meaningful ages, previously studied discordant monazite from ultrahigh temperature paragneiss Archean Napier Complex (Antarctica) have been investigated. Monazite grains were characte...

In an attempt to clarify the significance of Pb model ages in Pb-Zn sedimentary deposits, we report high-precision isotopic compositions for 64 galenas and 52 K-feldspars, former from ores latter separated granites. All samples are Spain French Pyrenees. Lead galena is unequivocal continental origin. With few exceptions, systematically exceed emplacement by up 400 Ma, a gap which well outside u...

kalchoye copper-gold deposit is located about 110 kilometers east of esfahan province and within the eocene volcano sedimentary rocks. sandy tuff and andesite lava are important members of this complex.the form of mineralization in area is vein and veinlet and quartz as the main gangue phase. the main ore minerals are chalcopyrite, chalcocite, galena and weathered minerals such as goethite, iro...