QE582 : Mineralogy, geochemistry and genesis of Rezvan iron ore deposit, northeast of Rafsanjan
Thesis > Central Library of Shahrood University > Geosciences > MSc > 2024
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Abstarct: The Rezvan iron deposit is located in Kerman province, 28 km northeast of Rafsanjan. This deposit is located in the Central Iran Zone and in the Poshte Badam block. Stratigraphically, the rock units cover the Late Proterozoic age range and the rock units from bottom to top include the shale, sandstone, limestone, basaltic tuff and lava, stromatolite limestone, white quartzite, and massive dolomite. Iron mineralization has occurred in a specific stratigraphic horizon. Considering the structure, texture, and mineralogy, the orebodies have a laxyered facies at the top and a vein-veinlet facies at the bottom. The main minerals of the ore include the primary minerals magnetite, oligist/specularite, pyrite and chalcopyrite. baxsed on field observations, hand sampling and microscopy, the important structures and textures identified in the deposit include massive, banded, brecciated, vein-veinlet, disseminated and replacement. Chloritization and epidotization in the host and footwall tuff units are the most widespread alteration and other minor alterations are silicic and sericitic. baxsed on studies of structure, texture, mineralogy, alteration and precedence and delay of mineral veins in the footwall, three main phases of mineralization can be recognized in the Rezvan deposit. The first phase, in the form of first-generation veinlets, was mainly composed of quartz (with minor amounts of pyrite) and was siliceous in nature, which probably indicates lower temperature and higher pH conditions of the fluid. The second phase, which is the main phase, consists mainly of magnetite with pyrite, epidote, chlorite and phlogopite and sometimes vermiculite, hornblende and actinolite, and indicates higher temperature and lower pH. The third phase, in the form of third-generation carbonate ore-bearing veinlets, contains some magnetite, pyrite and sometimes oligist/specularite and silica, which seems to have lower temperature than the previous phase and higher pH and Eh. baxsed on geochemical studies, according to the normalized diagram to chondrite, the europium and cerium values show negative anomaly, which along with Ni/Co، U/ThandCu/Znratiosindicates formation of the ores in a shallow and oxidizing environment. baxsed on geochemical studies on stringer, massive and banded ore facies, the amount of Zn, V, Ni, Co, Mn and As elements increases from the stringer section towards the massive and banded facies, while the amount of Sr and Ti elements decreases. The study of fluids inclusions involved in calcite and quartz of the vein-vein zone indicates a salinity of 3.81 to 14.27% NaCl eq. and a homogenization temperature of 148 to 225°C for ore-forming fluids.
Considering the geometric shape of the orebodies and ore-bearing facies, the structure, texture and mineralogy of the mineral, alteration and geochemical characteristics, it is inferred that the Rezvan iron deposit was formed as volcanic-sedimentary during the Late Proterozoic in an arc environment.
Keywords:
#iron #volcanic-sedimentary #Posht Badam Block #Rafsanjan #Rezvan Keeping place: Central Library of Shahrood University
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