Magmatic and hydrothermal evolution of the Skouries Au-Cu porphyry deposit, northern Greece

Höss, Alica; Haase, Karsten M.; Keith, Manuel; Klemd, Reiner; Melfos, Vasilios; Gerlach, Lisa; Pelloth, Fabian; Falkenberg, Jan J.; Voudouris, Panagiotis; Strauss, Harald; Baker, Tim; Tarantola, Alexandre

doi:10.1016/j.oregeorev.2024.106233

Ore Geology Reviews

2024

DOI: 10.1016/j.oregeorev.2024.106233

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Magmatic and hydrothermal evolution of the Skouries Au-Cu porphyry deposit, northern Greece

Alica Höss,

Karsten M. Haase,

Manuel Keith

et al.

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Cited by 2 publications

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The Paleoproterozoic Raimunda Porphyry-Type Gold Deposit, Juruena Mineral Province, Amazonian Craton (Brazil): Constraints Based on Petrological, Fluid Inclusion and Stable Isotope Data

Lopes,

Moura

2024

Minerals

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The Juruena Mineral Province is an emerging world-class mineral province in the southern Amazonian Craton, due to numerous Au-Cu and base metal deposits, such as the Raimunda deposit, related to Novo Mundo 2.03–1.98 Ga I-type calc-alkaline granites. Its hydrothermal alteration zones comprise Na-metasomatism, microclinization, propylitic and sericitic alteration, silicification, a sulfide stage, and late carbonate alteration. The disseminated mineralization, associated with the sulfide stage, the main mineralization stage, is represented by gold inclusions and fracture-filling grains in pyrite, chalcopyrite, and Cu-Bi sulfides. Chlorite geothermometer and fluid inclusion data indicate temperature conditions of 325–380 °C for the mineralization. The coexistence of high-temperature aqueous and aqueous-carbonic fluid inclusions, based on a microthermometric study of fluid inclusions, reveals a mixing of medium-saline hot fluids with cooler and low-saline fluid. The δ18Ofluid (3.11–7.86‰) and δ34Spy data (−1.4–0.1‰) are coherent to the magmatic origin of the mineralizing fluid. Gold was initially transported as chlorine complexes in a hot, high-salinity, acidic, and oxidized fluid from the magma chamber, and later as H2S− complexes. The chemical-physical instability during fluid ascent is interpreted as a triggering factor for ore precipitation. The results offer valuable insights into the genesis of porphyry–Au deposits and their implications for prospecting in the Amazonian Craton.

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The Paleoproterozoic Raimunda Porphyry-Type Gold Deposit, Juruena Mineral Province, Amazonian Craton (Brazil): Constraints Based on Petrological, Fluid Inclusion and Stable Isotope Data

Lopes,

Moura

2024

Minerals

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Application of “Alteration indices” at the Elatsite porphyry-copper deposit: a reliable geochemical tool for identification of hydrothermal alteration zones at porphyry deposits

Georgieva,

Nedialkov,

Stefanova

et al. 2024

Rev. Bulg. Geol. Soc.

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The Elatsite porphyry-copper deposit is one of the largest and well-studied deposits in Bulgaria. The mineralization and hydrothermal alteration are related to Late Cretaceous magmatic activity associated with the Late Alpine evolution of the area. The three of the most common alteration types are K-silicate, K-silicate-sericitic and quartz-sericitic alteration. The three alterations have complicated relationships and in most cases are superimposed on each other, which makes field studies and petrographic observations difficult. The geochemical data for altered rocks can provide useful information and further be used as a geochemical tool for accurate determination of the alteration. One way of representing this geochemical data is by calculating the „Alteration indices“. These indices represent ratios of the major elements oxides and here we present data for three Alteration indices (AI 1, AI 2 and CCPI). Our results suggest that the increase of the AI 1 and the decrease of the AI 2 and CCPI for the K-silicate, K-silicate-sericitic and quartz-sericitic alterations compared to the unaltered rocks are related to the gain of K2O and MgO and the loss of CaO and Na2O during the alteration process. The graphical construction of juxtaposition of two Alteration indices provides a useful tool for accurate distinction of the three most common alteration types of the Elatsite PCD.

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Magmatic and hydrothermal evolution of the Skouries Au-Cu porphyry deposit, northern Greece

Cited by 2 publications

References 132 publications

The Paleoproterozoic Raimunda Porphyry-Type Gold Deposit, Juruena Mineral Province, Amazonian Craton (Brazil): Constraints Based on Petrological, Fluid Inclusion and Stable Isotope Data

The Paleoproterozoic Raimunda Porphyry-Type Gold Deposit, Juruena Mineral Province, Amazonian Craton (Brazil): Constraints Based on Petrological, Fluid Inclusion and Stable Isotope Data

Application of “Alteration indices” at the Elatsite porphyry-copper deposit: a reliable geochemical tool for identification of hydrothermal alteration zones at porphyry deposits

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