Mineralogy, and genesis of Khalyfehlou copper deposit based on host rock geochemical data and o-s isotope characteristics

Esmaeli, M.; Lotfi, M.; Nezafati, N.

doi:10.22071/gsj.2019.84248

Document Type : Original Research Paper

Authors

¹ Ph.D. Student, Department of Geology, Islamic Azad University, Science and Research Branch, Tehran, Iran

² Professor, Department of Geology, Islamic Azad University, Science and Research Branch, Tehran, Iran

³ Assistant Professor, Department of Geology, Islamic Azad University, Science and Research Branch, Tehran, Iran

https://doi.org/10.22071/gsj.2019.84248

Abstract

Khalyfehlou Cu deposit (southeast of the Zanjan), is the volcanic-hosted vein-type deposit located in the Tarom metallogenic zon,Western Alborz (northwest of Iran) . Tarom zone consist mainly of volcanic and volcaniclastic rocks of the Karaj Formation (Early to Middle Eocone). Regarding the stratigraphic position, the Karaj Formation is divided into two members: Kordkand and Amand. The Kordkand member is overlain by the Amand member .The Amand member is divided into six units, Ea₁ through Ea₆. The Khalyfehlou Cu deposit is located in Ea₅ and Ea₆ units of Amand member .The Karaj Formation is interrupted by large and linear intrusions with calc alkaline affinities. Host rocks are green tuffs and, rarely, andesites. The patterns of rare earth elements in the studied samples indicate the negative anomaly of Eu element due to plagioclase subtraction. In all the samples, the enrichment of light rare earth elements (LREE) and large lithophil ion (LILE) elements and the depletion of strong field strength elements (HFSE) are observed. This probably indicates the common origin of these rocks. Main minerals include chalcopyrite, bornite, chalcocite, and covellite and gangue minerals including quartz, sericite, and calcite. In this paper the origin of ore-forming fluids and genesis of Khalyfehlou Cu deposit is studied using sulfur and oxygen isotope data. The sulfur isotope values for the chalcopyrite range from −2.0 to −5.3‰. Negative sulfur isotopes values and the occurrence of framboidal pyrite in the tuffaceous sandstone host rocks suggests a sedimentary origin for the sulfur. The oxygen isotope composition of quartz from the veins ranges from 12.3 to 14.3‰. The δ¹⁸O_fluid values calculated from the oxygen isotope data range from 0.6‰ to 3.6‰. The O isotopic characteristics indicate that the ore-forming fluids for the Khalyfehlou deposit was meteoric-formational water.This study suggests that mineralization at the Khalyfehlou deposit is similar to cordilleran vein-type deposits.

Keywords

20.1001.1.10237429.1397.28.110.6.6

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Scientific Quarterly Journal of Geosciences

Mineralogy, and genesis of Khalyfehlou copper deposit based on host rock geochemical data and o-s isotope characteristics

References

References

Scott, R. J., Meffre, S., Woodhead, J., Gilbert, S. E., Berry, R. F. and Emsbo, P., 2009- Development of Framboidal Pyrite During Diagenesis, Low-Grade Regional Metamorphism, and Hydrothermal Alteration. Economic Geology 104:1143–1168.

Volume 28, Issue 110
December 2018
Pages 33-46

Mineralogy, and genesis of Khalyfehlou copper deposit based on host rock geochemical data and o-s isotope characteristics

References

References

Scott, R. J., Meffre, S., Woodhead, J., Gilbert, S. E., Berry, R. F. and Emsbo, P., 2009- Development of Framboidal Pyrite During Diagenesis, Low-Grade Regional Metamorphism, and Hydrothermal Alteration. Economic Geology 104:1143–1168.

Volume 28, Issue 110December 2018Pages 33-46

Volume 28, Issue 110
December 2018
Pages 33-46