Major impurity elements in native gold and their association with gold mineralization settings in deposits of Asian folded areas

Gaskov, I.V.

doi:10.1016/j.rgg.2017.08.004

Cited by 19 publications

(10 citation statements)

References 17 publications

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“…In other hand silver is more affine to sulfur than to gold and tend to enter sulfide minerals (Gas'kov, 2017). These processes are depended on the content of Au, Ag and Cu in the hydrothermal fluid, crystallization temperature and sulfur fugacity (Palyanova et al, 2018;Gas'kov, 2017). The significantly high concentrations of Au (> 10 000 ppb) and Ag (>4000 ppb) are observed only in the samples of the Cu-Fe massive ore, suggesting electrum intergrowth with sulfide minerals mainly in breccias ores.…”

Section: Resultsmentioning

confidence: 98%

“…8a-8e). Cu, Au, and Ag belong to the chalcophile elements group, which naturally prefer to bond with sulfur to form the resist compounds (Palyanova et al, 2018;Gas'kov, 2017). Au and Ag often occur together with pyrite, chalcopyrite and pyrrhotite ( Fig.…”

Section: Resultsmentioning

confidence: 99%

“…The samples with positive correlation belong to the first zone and the most of samples with negative correlation are within the second deposit part. Co and Ni are the typical siderophile elements and often occur in the sulfoarsenides or with Fe in pyrrhotite or pyrite, but their grades in IOCG deposit are rarely exceed 100 ppm (Barton, 2014;Gas'kov, 2017). In the Sin Quyen deposit the concentrations of these elements range from a few ppm up to 300 ppm (Tab.…”

Section: Resultsmentioning

confidence: 99%

“…For example in the ores of high Fe grade there is often low Ti with variable Cu, Au, Ag as well as REE or in allanites-Ce the REE concentration is inversely proportional to the Ca contents (Zhao and Zhou, 2011;Barton, 2014). Ag contents in multistage deposits (skarn, massive sulfides, and black shale) abrupt increase in later low-temperature assemblages regardless of deposit type (Gas'kov, 2017). Letnikova with her co-workers (2011) used geochemical correlations of different oxides to reconstruct the geodynamic processes of forming deposits in Tuva-Mongolian Massif.…”

Section: Introductionmentioning

confidence: 99%

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Relationship Between Some Selected Major, Minor and Trace Elements in the Iocg Deposits (On the Example of the Unique Sin Quyen Deposit, Lao Cai Province, North Vietnam)

2020

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In the paper the authors attempted to study the relations between several selected elements present in the IOCG Sin Quyen deposit, Lao Cai, North Vietnam and to interpret the obtained correlations especially with coefficient higher than 0.7. The correlations with high coefficients are mainly observed for the elements belonging to the chalcophile group (Cu, Ag, Au, Te, Bi) and for the relation between uranium and Ag, Au, Cu, Pb and Bi .But the S and Fe as well as REE currying minerals are predominant in the studied deposit, but no strong correlation between them and other elements was observed even with Cu. The phenomena primarily explained based on the geochemistry properties of the mentioned elements and the characteristics of IOCG deposits.

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Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Relationship Between Some Selected Major, Minor and Trace Elements in the Iocg Deposits (On the Example of the Unique Sin Quyen Deposit, Lao Cai Province, North Vietnam)

2020

GiG

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“…Large occurrences of low-sulfide, essentially Au-Pd mineralization in different types of mafic-ultramafic complexes are known in the Norilsk district (Talnakhskoye, Norilsk-1 and 2, Chernogorskoe, Vologochanskoe), in the Skaergaard formation, in John Melville reef of the Stillwater complex and some others [46]. The elevated Cu content in native gold indicates the probable genetic relation of gold mineralization with mafic-ultramafic complexes or with the deposits of copper type (copperskarn, copper-pyrite and porphyry copper) [47][48][49][50].…”

Section: Discussionmentioning

confidence: 99%

Native Gold in the Chudnoe Au-Pd-REE Deposit (Subpolar Urals, Russia): Composition, Minerals in Intergrowth and Genesis

et al. 2021

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Composition of native gold and minerals in intergrowth of the Chudnoe Au-Pd-REE deposit (Subpolar Urals, Russia) was studied using optical microscopy, scanning electron microscopy, and electron microprobe analysis. Five varieties of native gold have been identified, based on the set of impurity elements and their quantities, and on intergrown minerals. Native gold in rhyolites from the Ludnaya ore zone is homogeneous and contains only Ag (fineness 720‰, type I). It is in intergrowth with fuchsite or allanite and mertieite-II. In rhyolites from the Slavnaya ore zone, native gold is heterogeneous, has a higher fineness, different sets and contents of elements: Ag, Cu, 840–860‰ (type II); Ag, Cu, Pd, 830–890‰ (III); Ag, Pd, Cu, Hg, 840–870‰ (IV). It occurs in intergrowth with fuchsite, albite, and mertieite-II (type II), or albite, quartz, and atheneite (III), or quartz, albite, K-feldspar, and mertieite-II (IV). High-fineness gold (930–1000‰, type V) with low contents of Ag, Cu, and Pd or their absence occurs in the form as microveins, fringes and microinclusions in native gold II–IV. Tetra-auricupride (AuCu) is presented as isometric inclusions in native gold II and platelets in the decay structures in native gold III and IV. The preliminary data of a fluid inclusions study showed that gold mineralization at the Chudnoe deposit could have been formed by chloride fluids of low and medium salinity at temperatures from 105 to 230 °C and pressures from 5 to 115 MPa. The formation of native gold I is probably related to fuchsitization and allanitization of rhyolites. The formation of native gold II-V is also associated with the same processes, but it is more complicated and occurred later with a significant role of Na-, Si-, and K-metasomatism. The presence of Pd and Cu in the ores and Cr in fuchsite indicates the important role of mafic-ultramafic magmatism.

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Chemical and physical heterogeneity within native gold: implications for the design of gold particle studies

et al. 2021

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Studies of populations of gold particles are becoming increasingly common; however, interpretation of compositional data may not be straightforward. Natural gold is rarely homogenous. Alloy heterogeneity is present as microfabrics formed either during primary mineralization or by modification of pre-existing alloys by chemical and physical drivers during subsequent residence in either hypogene or surficial environments. In electron-probe-microanalysis (EPMA)-based studies, the combination of Cu, Hg, and Pd values and mineral inclusion suites may be diagnostic for source style of mineralization, but Ag alone is rarely sufficient. Gold characterization studies by laser-ablation-ICP mass spectrometry linked to both quadrupole and Time-of-Flight (ToF-MS) systems show that only Ag, Cu, and Hg form homogenous alloys with Au sufficiently often to act as generic discriminants. Where present, other elements are commonly distributed highly heterogeneously at the micron or submicron scale, either as mineral inclusions or in highly localized, but low concentrations. Drawing upon our own data derived from individual inspection and analyses of approximately 40,000 gold particles from 526 placer and in situ localities worldwide, we show that adequate characterization of gold from a specific locality normally requires study of a minimum of 150 particles via a two-stage approach comprising spatial characterization of compositional heterogeneity, plus crystallographic orientation mapping, that informs subsequent targeted acquisition of quantitative compositional data by EPMA and/or laser-ablation ICP-MS methods. Such data provide the platform to review current understanding of the genesis of gold particle characteristics, elevating future compositional studies from empirical descriptions to process-focused interpretations.

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Major impurity elements in native gold and their association with gold mineralization settings in deposits of Asian folded areas

Cited by 19 publications

References 17 publications

Relationship Between Some Selected Major, Minor and Trace Elements in the Iocg Deposits (On the Example of the Unique Sin Quyen Deposit, Lao Cai Province, North Vietnam)

Relationship Between Some Selected Major, Minor and Trace Elements in the Iocg Deposits (On the Example of the Unique Sin Quyen Deposit, Lao Cai Province, North Vietnam)

Native Gold in the Chudnoe Au-Pd-REE Deposit (Subpolar Urals, Russia): Composition, Minerals in Intergrowth and Genesis

Chemical and physical heterogeneity within native gold: implications for the design of gold particle studies

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