QE294 : Mineralogy, geochemistry and genesis of the Abri, Rahbari, Cheshmeh Marziyeh Cu deposit, NW Darooneh
Thesis > Central Library of Shahrood University > Geosciences > MSc > 2016
Authors:
Afsaneh Soltani [Author], Farajollah Ferdoust[Supervisor]
Abstarct: Abri copper deposit is at the in Khorasan Rasavi province: located in 80 km NW Bardeskan, 25 km NW Darooneh. Rahbari copper deposite in 4 km east and Cheshmeh Marziyeh copper deposite are located in 40 km SW Abri area. The study area is a part of Khaf-Darooneh volcanic-plutonic belt, Sabzevar Sub- Zone. The studied area rock units consisted of three categories with Middle Eocene include: 1-submarine lava (andesite, basalt, porphyry andesite-basalt, andesite, trachy andesite, trachy dacite and dacite), 2- pyroclastic (tuff and agglomerate) and 3- Eocene sedimentary which is cut off by basaltic dikes in some areas. The volcanic rocks belong to medium to high K calc-alkaline magmatic series and have been formed during a volcanic arc tectonic regime of active continental margin. The effective factors copper mineralization in the study areas including: 1- The lithology of host rocks, (2) structural controls, 3- hydrothermal fluids and 4- The presence of intrusive bodies at depth and basaltic dykes. The controllers play a significant role in the transfer of hydrothermal fluids and their accumulation and deposition. Mineralization in Abri and Rahbari areas, on the border of limestone units with pyroclastic rocks and lava as strata bound and in Cheshmeh Marzieh area occurred as veins along the fault planes in a lava unit. The mineral is formed as veins and vein- veinlet, cavities and open space filling and disseminated. The most important alterations in the area of the volcano-sedimentary sequences are the argillic alteration, silicification and carbonate. The main minerals formed the deposits are classified in three groups of sulfide minerals (chalcocite, covellitis, bornite, chalcopyrite and pyrite), carbonate minerals (malachite, azurite) and oxide minerals (cuprite, magnetite, hematite and limonite). The main texture of the area including: vein-veinlets, open space filling, disseminated and replacement. baxsed on the micro thermometry studies the average of fluid inclusions homogenization temperature in Abri area 229 ˚C and in Cheshmeh Marziyeh is 167 ˚C. The average of salinity in the Abri and Cheshmeh Marziyeh area 1.7 and 1.8 wt% NaCl, respectively. baxsed on the geochemical studies copper is the highest production element (The equivalent of 4 to 5 weight percent) and display the maximan correlation with silver. finally, regarding our research the mineralization in Abri and Rahbari areas similare copper whith manto type deposits and in the Cheshmeh Marziyeh whith low-sulfidation epithermal system.
Keywords:
#Copper #Manto #mineralogy #geochemistry #Abri #Bardeskan #Khaf- Darooneh Link
Keeping place: Central Library of Shahrood University
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