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Abstract <p>The Nineh deposit is a Pb–Zn deposit hosted by Lower Cretaceous limestone as stratabound and epigenetic mineralization. Based on microthermometery results of fluid inclusions trapped in calcite and barite, a mean homogenization temperature of about 169 and 127°C, and a mean salinity of 5.7 and 13.9 wt % NaCl equiv. were obtained, respectively. The salinity vs. homogenization temperature diagram indicates mixing and cooling as the key mineralization mechanisms. The multiple sources of sedimentary, metamorphic rocks, oceanic water, and evaporate sulfates can be inferred from three different ranges of δ<sup>34</sup>S values of sphalerite, galena (&lt;10‰ and 19–21.5‰) and barite (43.7‰). Also, pH fluctuations due to mixing, mineralization, and interaction of mineralizing ore fluids with the host rocks are evident, recorded by a wide range of HREE (14.21–58.72 ppm). δ<sup>13</sup>C (0.1–0.5‰) and δ<sup>18</sup>O (–9.5 to –11.5‰) values of calcite samples are in accordance with a marine carbonate source and a high degree of interaction of the ore fluids with different sources. Consequently, the deposit could be classified as a Mississippi Valley type (MVT) deposit that has undergone more W/R interaction as a result of multiple orogenic events.</p>

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A Comparative Study on the Rare Earth Element Distribution, Fluid Inclusion and Stable Isotope: an Approach to the Origin of Nineh Lead-Zinc Deposit, North Mahallat, Iran

  • 期刊论文

  • 发表日期：

    2026年4月1日

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  • Shayan Akrami,
  • MohammadAli Aliabadi,
  • MohammadReza Hazareh,
  • Abbas Asgari,
  • Tayebeh Ramezani

摘要

Abstract

The Nineh deposit is a Pb–Zn deposit hosted by Lower Cretaceous limestone as stratabound and epigenetic mineralization. Based on microthermometery results of fluid inclusions trapped in calcite and barite, a mean homogenization temperature of about 169 and 127°C, and a mean salinity of 5.7 and 13.9 wt % NaCl equiv. were obtained, respectively. The salinity vs. homogenization temperature diagram indicates mixing and cooling as the key mineralization mechanisms. The multiple sources of sedimentary, metamorphic rocks, oceanic water, and evaporate sulfates can be inferred from three different ranges of δ34S values of sphalerite, galena (<10‰ and 19–21.5‰) and barite (43.7‰). Also, pH fluctuations due to mixing, mineralization, and interaction of mineralizing ore fluids with the host rocks are evident, recorded by a wide range of HREE (14.21–58.72 ppm). δ13C (0.1–0.5‰) and δ18O (–9.5 to –11.5‰) values of calcite samples are in accordance with a marine carbonate source and a high degree of interaction of the ore fluids with different sources. Consequently, the deposit could be classified as a Mississippi Valley type (MVT) deposit that has undergone more W/R interaction as a result of multiple orogenic events.