جستجوی مقالات مرتبط با کلیدواژه « کانی زایی مس » در نشریات گروه « زمین شناسی »

The Pliocene-Quaternary sediments of the southern plain of Rafsanjan (west of Kerman province), have a variety of sedimentary copper minerals which can be used as gemstones and suitable for minerals/rocks colledctioners. The most important copper identified minerals include malachite, azurite, atacamite and paratacamite. Copper mineralization in this sequence is observed in three forms: cement (in conglomerates), nodules (in sandstones and tuffaceous mudstones), and alternating parallel to cross-laminations with calcite (travertines). The first two groups have only a decorative value, but the third group has the potential for jewelry making and is therefore presented as a gemstone. The leaching of copper from porphyry copper deposits in the upstream area (related to the Dehj-Sardouyeh belt) followed by the enrichment and deposition of copper in the young deposits downstream is considered the most probable model for the copper mineralization in the studied deposits. These deposits are called as exotic copper deposits.

The sedimentary copper mineralization of the Sorkheh area is located about 20 km northwest of Marand, East-Azarbaidjan Province, northwest Iran. The most important lithologic units in this area include sandstones and red-color shales, with the Late Miocene age, that are intruded by lamprophyric dike. The copper mineralization in the study area occurred as stratiform laminations and disseminations hosted by sandstones and shales and as open-space filling textures within lamprophyric dike. The ore mineralization in the sandstones consists of chalcopyrite, bornite, chalcocite, tetrahedrite, covellite, native copper, and cuprite. This study showed that mineralization is associated with weathering and leaching of the lamprophyric dike. Also, deposition of copper in sandstone units can be related to trapping of organic matters. Activity of the hydrothermal fluids,  presence of abundant organic matters, function of diagenetic processes, existance of the geochemical barriers (organic matter and silicification), and the active tectonic in the area played crucial roles in this ore mineralization.

Sahebdivan area is located at 20.km of Meshkinshahr in Ardebil province. The study area is comprises of volcanic rocks and intrusive masses consisting of quartz monzonite and granite along with several vast epithermal alterations. The main objective of this paper is to recognize the present alteration zones indicating metal promising areas using geophysical methods such as induced polarization (IP) surveying and resistivity (RS) in order to assess the presence of minerals and delineate the subsurface masses at depth. Therefore, IP/resistivity survey was carried out based on rectangular array in the area and their corresponding maps were prepared. Accordingly, their promising anomalous zones for mineralization were initially detected. Furthermore, a new IP survey was attempted based on a dipole-dipole electrode array for detailed potential mapping. Considering IP/RS pseudo-sections, the position, depth, intensity and extent of mineralization was defined. Correlating the anomalous zones obtained geophysical results with Lithology and alteration zones in the area indicate Cu mineralization along E-W trend in Sahebdivan which is associated with increase in chargeability and reduction in resistivity. Furthermore topographic corrections were attempted resulting in anomalous halos enhancement. Discriminating the important alteration zones in the area were carried out based on chargeability variations higher chargeability indicate phyllic alteration with pyrite and in contrast the Potassic alteration with low chargeability that coincide with igneous intrusive. It can be deduced this study that the porphyry micro quartz monzonite - micro quartz diorite generator fluids was recognized as source of mineralization along with surrounding andesite–dacite andesite as source of the anomalous zones in Sahebdivan area. Summing all the evidences field studies and their compliance with geophysical results, Lithology, alterations and ultimately considering the susceptible mineralization zones, the optimal drilling points was proposed with priority of SABH-1 according to the Potassic zone in terms of potential copper mineralization.