Rhenium distribution in molybdenite: Results of microprobe scanning (Copper Porphyry Deposits, the Urals)

Грабежев, А. И.; Shagalov, E. S.

doi:10.1134/s1028334x10030189

Cited by 16 publications

(17 citation statements)

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“…A variation of the Re content in molybdenite grains from core to rim has been previously demonstrated, but only on the basis of a few microprobe compositions (Giles & Shilling 1972, Kovalenker et al 1974, Filimonova et al 1984, Aleinikoff et al 2012. A rhythmical zoning of Re distribution in single molybdenite grains has been demonstrated by microprobe scanning from the Mikheevsk and Voznesensk porphyry-style deposits, southern Urals, by Grabezhev & Shagalov (2010) and Grabezhev & Gmyra (2014), respectively. Ciobanu et al (2013) described a zoned molybdenite grain from the Hilltop porphyry-epithermal deposit, Lander County, NV, USA, where Re-W displays oscillatory zonation in a depleted inner core and there is no marked boundary between the Re-rich outer core and halo.…”

Section: Introductionmentioning

confidence: 86%

“…Of considerable interest is the behavior of Re during deformation of the molybdenite and during epigenetic processes under the influence of a post-mineralization fluid at the Voznesensk deposit, since such processes may cause redistribution or decoupling within molybdenite and explain the strong variation in the Re concentration within single grains (as suggested by McCandless et al 1993, Suzuki et al 2000, Stein et al 2001, Selby & Creaser 2004, Kosler et al 2003, Grabezhev & Shagalov 2010.…”

Section: Post-mineralization Behaviour Of Re In Molybdenitementioning

confidence: 97%

“…3) or small areas of irregular shape. It is possible that the lack of rhythmic zones from several molybdenite grains is an apparent feature, and that such patterns may become visible by increasing the scanning period for more than 16 hours (Grabezhev & Shagalov 2010).…”

Section: Rhenium In Molybdenitementioning

confidence: 99%

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RHENIUM DISTRIBUTION IN MOLYBDENITE FROM THE VOSNESENSK PORPHYRY Cu (Mo,Au) DEPOSIT (SOUTHERN URALS, RUSSIA)

Грабежев

Voudouris

2014

The Canadian Mineralogist

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Molybdenite from the Voznesensk porphyry Cu ± (Mo,Au) deposit, southern Urals, Russia, displays high Re content and a well-documented oscillatory zoning for this mineral. The molybdenite forms part of a quartz-molybdenite-pyrite-chalcopyrite assemblage cemented at low-temperatures by pumpellyite and tobermorite. Oscillatory zoning occurs as micro-bands up to 200 μm wide and 200-600 μm long oriented parallel to the basal cleavage, as well as within basal planes of molybdenite sheets. The micro-bands are Re-enriched to different degrees (0.3-1.0 wt.%, typically they contain 0.6-0.8 wt.% Re). Outside these structures the Re content in molybdenite is up to 0.25 wt.%, usually <0.10-0.15 wt.%. It is suggested that the Re in the Voznesensk molybdenite retains its original growth pattern, marked by sharp concentration variations, and is not the result of leaching through post-crystallization diffusion. Variations in the number, width, and Re-content in individual micro-zones observed within the oscillatory zones may suggest involvement of extrinsic mechanisms of micro-zone formation. However, the Re content of the Voznesensk molybdenite (ICP-MS and EPMA data) is almost uniform along the studied vertical and lateral interval of the mineralization, suggesting no major variation in Re concentration in the fluid and favoring uniform, selforganization processes causing Re enrichment and oscillatory zoning in molybdenite. Despite the strong degree of epigenetic post-crystallization deformation of the molybdenite flakes and their cementation by low-temperature tobermorite, there is no essential change of the primary micro-zoning in the distribution of Re and any evidence of its epigenetic migration.

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Section: Introductionmentioning

confidence: 86%

Section: Post-mineralization Behaviour Of Re In Molybdenitementioning

confidence: 97%

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RHENIUM DISTRIBUTION IN MOLYBDENITE FROM THE VOSNESENSK PORPHYRY Cu (Mo,Au) DEPOSIT (SOUTHERN URALS, RUSSIA)

Грабежев

Voudouris

2014

The Canadian Mineralogist

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“…It was proposed by several workers that Re must have redistributed or decoupled within molybdenite after its formation [23,[79][80][81][82]. These processes may explain the strong variation in the rhenium concentration within single grains.…”

Section: Mineralogy Of Rhenium-bearing Phasesmentioning

confidence: 99%

Extremely Re-Rich Molybdenite from Porphyry Cu-Mo-Au Prospects in Northeastern Greece: Mode of Occurrence, Causes of Enrichment, and Implications for Gold Exploration

et al. 2013

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Extremely Re-rich molybdenite occurs with pyrite in sodic-calcic, sodic-sericitic and sericitic-altered porphyritic stocks of granodioritic-tonalitic and granitic composition in the Sapes-Kirki-Esymi, Melitena and Maronia areas, northeastern Greece. Molybdenite in the Pagoni Rachi and Sapes deposits is spatially associated with rheniite, as well as with intermediate (Mo,Re)S 2 and (Re,Mo)S 2 phases, with up to 46 wt % Re. Nanodomains and/or microinclusions of rheniite may produce the observed Re enrichment in the intermediate molybdenite-rheniite phases. The extreme Re content in molybdenite and the unique presence of rheniite in porphyry-type mineralization, combined with preliminary geochemical data (Cu/Mo ratio, Au grades) may indicate that these deposits have affinities with Cu-Au deposits, and should be considered potential targets for gold mineralization in OPEN ACCESSMinerals 2013, 3 166 the porphyry environment. In the post-subduction tectonic regime of northern Greece, the extreme Re and Te enrichments in the magmatic-hydrothermal systems over a large areal extent are attributed to an anomalous source (e.g., chemical inhomogenities in the mantle-wedge triggered magmatism), although local scale processes cannot be underestimated.

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“…This very scarce element has been found in granite pegmatites and quartz veins (e.g. in Japan [2]) as well as in volcanic gases, namely from the Kudryavy Volcano, Kurile Islands [3], but it occurs mainly in ores of porphyry copper-molybdenum deposits [4][5][6][7][8][9] associated to molybdenite, MoS 2 , generally recognized as the main Re-carrier in nature [10,11]. Indeed, specific rhenium minerals are so far confined to very few sulphides among which rheniite, ReS 2 [12]expected to be structurally identical to synthetic rhenium disulphide [13] despite its crystal structure has not yet been fully determined [14], and tarkianite (Cu, Fe) (Re, Mo) 4 S 8 [15], a lacunar kenotetrahedral [16] thiospinel.…”

Section: Introductionmentioning

confidence: 99%

Molybdenite as a Rhenium Carrier: First Results of a Spectroscopic Approach Using Synchrotron Radiation

Pereira¹,

Maria-Ondina²,

Oliveira³

et al. 2013

JMMCE

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The chemical and physical properties of rhenium render it a highly demanded metal for advanced applications in important industrial fields. This very scarce element occurs mainly in ores of porphyry copper-molybdenum deposits associated with the mineral molybdenite, MoS 2 , but it has also been found in granite pegmatites and quartz veins as well as in volcanic gases. Molybdenite is a typical polytype mineral which crystal structure is based on the stacking of [SMo-S] with molybdenum in prismatic coordination by sulphide anions; however, it is not yet clearly established if rhenium ions replace Mo 4+ cations in a disordered way or else, if such replacement gives rise to dispersed nanodomains of a rhenium-rich phase. As a contribution to clarify this question, an X-ray absorption spectroscopy (XANES) study using synchrotron radiation was performed at the Re L 3 -edge of rhenium-containing molybdenite samples. Obtained results are described and discussed supporting the generally accepted structural perspective that rhenium is mainly carried by molybdenite through the isomorphous replacement of Mo, rather than by the formation of dispersed Re-specific nanophase(s).

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Rhenium distribution in molybdenite: Results of microprobe scanning (Copper Porphyry Deposits, the Urals)

Cited by 16 publications

References 3 publications

RHENIUM DISTRIBUTION IN MOLYBDENITE FROM THE VOSNESENSK PORPHYRY Cu (Mo,Au) DEPOSIT (SOUTHERN URALS, RUSSIA)

RHENIUM DISTRIBUTION IN MOLYBDENITE FROM THE VOSNESENSK PORPHYRY Cu (Mo,Au) DEPOSIT (SOUTHERN URALS, RUSSIA)

Extremely Re-Rich Molybdenite from Porphyry Cu-Mo-Au Prospects in Northeastern Greece: Mode of Occurrence, Causes of Enrichment, and Implications for Gold Exploration

Molybdenite as a Rhenium Carrier: First Results of a Spectroscopic Approach Using Synchrotron Radiation

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