Geology, Ore-forming Fluid Chemistry, Sr-Nd Isotopes, and Petrogenesis in the Nasim Copper Deposit, NW Bardaskan area, NE Iran
Year: 2024
Type: article
Abstract: The Nasim copper deposit is situated in Bardaskan area, northeast of Iran. The geological units include basalt, andesite, trachyandesite, and sedimentary rocks. Conglomerate composed of volcanic fragments and nummulitic limestone has been deposited as a result of subsequent volcanic activity. The majority of trachyte to andesitic rocks that plot within the shoshonite series and exhibit high LREE/HREE and Th/Yb ratios suggest an active continental margin. Elevated Th and Nb values indicate a minor continental crustal assimilation event. Initial 87Sr/86Sr and εNd (i) of the volcanic rocks (t=40 Ma) are 0.7042 to 0.7046 and +4.96 to +5.10 in the Nasim copper deposit, which confirms that it occurred during the continental margin subduction zone. The volcanic rocks were formed in a non-marine environment, and mineralization occurred within the conglomerate bands. The Nasim copper deposit has considered as Manto-type deposit, and chalcocite mineralization occurred after the formation of the conglomerate. The absence of epidote associated with chalcocite suggests low iron content and reducing conditions in the ore-forming fluid of the Nasim deposit. Therefore, the source of mineralization is not magmatic, and further studies on the origin of this deposit should be conducted.
Source: OICC Press Journals
Authors: Ramezani Abbakhsh, Touran, Karimpour, Mohammad Hassan, Azizi, Hossein, Saadat, Saeed, Asahara, Yoshihiro, Rahimi, Behnam
Language: English
Subfield: Geophysics
Field: Earth and Planetary Sciences
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7084582119
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