Scholarlink

<p>The Jalilabad Cu (± Au) deposit lies in the central section of the Tarom-Hashjin Metallogenic Belt, in northern Zanjan Province, NW Iran. Mineralization predominantly occurs within quartz-sulfide veins, veinlets, and breccia zones, primarily hosted by the Eocene volcanic and volcaniclastic units of the Karaj Formation. The mineralization trends NW–SE and is influenced by several strike-slip faults. Chalcopyrite and bornite are the principal hypogene sulfides, with chalcocite and covellite representing the supergene stage. The post-ore stage is characterized by brecciated calcite and quartz. Geochemical analyses show that the monzonite intrusion contains SiO₂ levels ranging from 69.80 to 70.24&#xa0;wt.%, K₂O+Na₂O values between 8.10 and 8.15&#xa0;wt.%, and K₂O/Na₂O ratios of 1.36 to 1.61. The intrusion is enriched in light rare earth elements (LREEs) and large-ion lithophile elements (LILEs) while being depleted in high-field-strength elements (HFSEs). A low Hf/Sm ratio indicates an orogenic-related magma, and a low Nb/La ratio points to a depleted mantle source. Microthermometric studies of three quartz types reveal moderate to high formation temperatures (195.4–322.7&#xa0;°C) and salinities ranging from 8.10 to 11.82&#xa0;wt.% NaCl<sub>equiv</sub>. Oxygen isotope data (<i>δ</i><sup>18</sup>O<sub>H2O</sub>O) range from +4.8‰ to +8.1‰, suggesting a magmatic origin for the ore-forming fluids, later diluted by meteoric water. Sulfur isotope values (<i>δ</i><sup>34</sup>S<sub>H2S</sub>) between −6.0‰ and −9.1‰ confirm a magmatic source. Fluid mixing and dilution are identified as the primary mechanisms for ore precipitation. Raman spectroscopy enables nondestructive identification of minerals through their unique vibrational peaks. Chalcopyrite (213, 280, 1304&#xa0;cm<sup>−1</sup>), hematite (214, 282, 469, 689, 1309&#xa0;cm<sup>−1</sup>), goethite (967&#xa0;cm<sup>−1</sup>), and quartz (125, 198, 458&#xa0;cm<sup>−1</sup>) show distinct spectral fingerprints indicating mineral differentiation, alteration tracking, and structural analysis in geological studies. Based on its geological context, the Jalilabad Cu (± Au) deposit is interpreted as resembling a high-sulfidation epithermal deposit.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

The Jalilabad copper deposit in the Tarom-Hashjin magmatic belt, NW Iran:Epithermal or porphyry deposit? Evidence from geology, alteration, geochemistry, fluid inclusions, and stable isotope studies

  • 期刊论文

  • 发表日期：

    2025年8月16日

查看全文
  • Mohammadreza Hosseinzadeh,
  • Ali Asadi,
  • Vartan Simmonds,
  • Matthew I. Leybourne,
  • Mohsen Moayyed,
  • Yalda Vahed

摘要

The Jalilabad Cu (± Au) deposit lies in the central section of the Tarom-Hashjin Metallogenic Belt, in northern Zanjan Province, NW Iran. Mineralization predominantly occurs within quartz-sulfide veins, veinlets, and breccia zones, primarily hosted by the Eocene volcanic and volcaniclastic units of the Karaj Formation. The mineralization trends NW–SE and is influenced by several strike-slip faults. Chalcopyrite and bornite are the principal hypogene sulfides, with chalcocite and covellite representing the supergene stage. The post-ore stage is characterized by brecciated calcite and quartz. Geochemical analyses show that the monzonite intrusion contains SiO₂ levels ranging from 69.80 to 70.24 wt.%, K₂O+Na₂O values between 8.10 and 8.15 wt.%, and K₂O/Na₂O ratios of 1.36 to 1.61. The intrusion is enriched in light rare earth elements (LREEs) and large-ion lithophile elements (LILEs) while being depleted in high-field-strength elements (HFSEs). A low Hf/Sm ratio indicates an orogenic-related magma, and a low Nb/La ratio points to a depleted mantle source. Microthermometric studies of three quartz types reveal moderate to high formation temperatures (195.4–322.7 °C) and salinities ranging from 8.10 to 11.82 wt.% NaClequiv. Oxygen isotope data (δ18OH2OO) range from +4.8‰ to +8.1‰, suggesting a magmatic origin for the ore-forming fluids, later diluted by meteoric water. Sulfur isotope values (δ34SH2S) between −6.0‰ and −9.1‰ confirm a magmatic source. Fluid mixing and dilution are identified as the primary mechanisms for ore precipitation. Raman spectroscopy enables nondestructive identification of minerals through their unique vibrational peaks. Chalcopyrite (213, 280, 1304 cm−1), hematite (214, 282, 469, 689, 1309 cm−1), goethite (967 cm−1), and quartz (125, 198, 458 cm−1) show distinct spectral fingerprints indicating mineral differentiation, alteration tracking, and structural analysis in geological studies. Based on its geological context, the Jalilabad Cu (± Au) deposit is interpreted as resembling a high-sulfidation epithermal deposit.