New insights into pyrite in the Western Mecsek uranium ore deposit: its morphology, invisible gold and trace element composition

Yıl 2025, Cilt: 177 Sayı: 177, 1 - 2

Medet Junussov Rustem Abirov Gulnur Mekenbek Aizada Assambayeva Nessipzhan Mukhamediyarova

https://doi.org/10.19111/bulletinofmre.1682894

Öz

This study presents the occurrence of invisible gold and associated trace elements in pyrite from the Late Permian Kővágószőlős Sandstone Formation within the Western Mecsek uranium ore deposit, Hungary. Eight pyrite-rich drill-core samples were analyzed using optical microscopy, EMPA, LA-ICP-MS, and sequential extraction coupled with ICP-OES. Optical microscopy and EMPA analyses identified three pyrite morphologies: framboidal (1–20 μm), cement (50–200 μm), and euhedral (1–20 μm). Framboidal pyrite, of bacterial origin, occurs within organic matter, whereas cement and euhedral pyrites are associated with quartz and feldspar. Cement pyrite occasionally hosts minor sulfosalt and galena inclusions. LA-ICP-MS detected gold in pyrite grains (average 0.33 ppm), while sequential extraction with ICP-OES confirmed gold at 0.42 ppm. Elevated concentrations of As, Zn, and Cu range from 0.2 to 2.3%, along with trace elements such as W (0.05-0.13 ppm), Ba (7- 40 ppm), and Ni (95-244 ppm), were also identified. Gold is interpreted to occur primarily as a solid solution within the pyrite lattice, whereas other trace elements are likely associated with metal nanoparticles on or within the pyrite grains. These findings emphasize the complex geochemistry of pyrite and highlight the necessity for further studies, including sulfur isotope analysis, to elucidate ore-forming processes and gold mineralization mechanisms.

Anahtar Kelimeler

Invisible gold, Pyrite, Arsenic, Western Mecsek, Uranium ore deposit

Etik Beyan

Special thanks to M. Ferenc, J. Földessy, and V. Mária for their invaluable support in accessing reliable analytical equipment and providing expert consultations. Appreciation also goes to K. Ferenc, E. Király, D. Debus, F. Móricz, J. Richards, M. Leskó, and L. Majoros for their crucial assistance and expertise during the extensive analytical and laboratory work. Their contributions were essential to the success of this research. We sincerely appreciate the constructive comments and valuable insights of Dr. David Richard Lentz, Dr. Nurullah Hanilçi, and Dr. Ali Tuğcan Ünlüer, which have significantly contributed to improving the quality of this manuscript.

Destekleyen Kurum

Special thanks to M. Ferenc, J. Földessy, and V. Mária for their invaluable support in accessing reliable analytical equipment and providing expert consultations. Appreciation also goes to K. Ferenc, E. Király, D. Debus, F. Móricz, J. Richards, M. Leskó, and L. Majoros for their crucial assistance and expertise during the extensive analytical and laboratory work. Their contributions were essential to the success of this research. We sincerely appreciate the constructive comments and valuable ins

Teşekkür

Special thanks to M. Ferenc, J. Földessy, and V. Mária for their invaluable support in accessing reliable analytical equipment and providing expert consultations. Appreciation also goes to K. Ferenc, E. Király, D. Debus, F. Móricz, J. Richards, M. Leskó, and L. Majoros for their crucial assistance and expertise during the extensive analytical and laboratory work. Their contributions were essential to the success of this research. We sincerely appreciate the constructive comments and valuable insights of Dr. David Richard Lentz, Dr. Nurullah Hanilçi, and Dr. Ali Tuğcan Ünlüer, which have significantly contributed to improving the quality of this manuscript.

Kaynakça

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