QE562 : Geology, geochemistry and origin of Taban copper deposit (Troud, south of Shahroud)
Thesis > Central Library of Shahrood University > Geosciences > MSc > 2023
Authors:
Behnoosh Yarafshar [Author], Mahmoud Sadeghian[Supervisor], [Supervisor]
Abstarct: Taban copper mining area is located 160 km south of Shahroud and about 20 km south of Bakhtarabadi Tarood. Turud-Chah Shirin magmatic belt, which continues to the west and east in the neighboring areas, is one of the significant geological events in this area. Taban mineral area includes a collection of volcanic, volcanic-pyroclastic rocks, along with sedimentary laxyers with a general east-west direction, and due to the harsh desert conditions and the lack of suitable access roads, on the rocks The volcano of this region has not been comprehensively studied so far. Volcanic rocks mostly have andesitic to basaltic composition and appeared as lava flows along with explosive deposits (debris) in the volcanic-sedimentary sequence. Lavas appear as dense rock masses with a prismatic structure. From the geochemical point of view, some positive and negative anomalies in the values of Ti, P, and K can be seen in the normalized diagram compared to the primary mantle for volcanic rock samples. The depletion of Ti in the samples of the region is consistent with the absence of titanium-bearing minerals in these samples. The abundance of Ce element is higher than other LREE elements in plagioclase due to the high distribution coefficient of this element. The high values of U and Th elements and large ion lithophile elements such as Ba and Ce in the rocks of the region show that the magma forming the studied rocks has undergone crustal contamination with the host rocks during ascent and replacement. In this region, copper mineralization is formed in the form of veins along the fault planes in the volcanic-azer-debris units (mostly pyrodebris), and the fractures resulting from the operation of these faults in the rocks of the region are the suitable place for The penetration of hydrothermal solutions has created. In fact, these faults and fractures are considered to be the main controller of mineralization. baxsed on desert observations and mineralogical studies, mineralization occurs in two stages: endogenous (pyrite and chalcocite) and exogenous. (chalcocite, cavelite, malachite, chrysocolla and goethite) has happened. Argillic, siliceous, sericity, chlorite and carbonate variations can be mentioned among the most important variations in the region. The structure and textures of the mineral material can be seen in the form of vein-veins, replacement, filling empty spaces and scattered grains. The grade of copper in ore samples varies from about 0.1 to more than 4%. Finally, according to lithology, mineralogy, mextamorphism, tectonics and geochemistry, it can be concluded that Taban copper deposit is a type of hydrothermal vein copper deposit with volcanic host rock.
Keywords:
#lithology #mineralogy #geochemistry #hydrothermal vein #Taban copper deposit #Turud-Chah-Shirin Keeping place: Central Library of Shahrood University
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