Tracing metal sources in peribatholitic hydrothermal W deposits based on the chemical composition of wolframite: The example of the Variscan French Massif Central

Harlaux, Matthieu; Mercadier, Julien; Marignac, Christian; Peiffert, Chantal; Cloquet, Christophe; Cuney, Michel

doi:10.1016/j.chemgeo.2017.12.029

Cited by 63 publications

(59 citation statements)

References 90 publications

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“…As mentioned, samples for Mazet are only available from a collection, thus it likely that their Mazet sample (MTM-1) was actually a rock from the stockwork. Indeed, the Mazet wolframite described in Harlaux's studies [7,40] shares many characteristics with that from the La Bosse stockwork-wolframite b in our study-i.e., colour, low hubnerite/ferberite ratio, Nb-rich zoning, trace element chemistry, and an age (~334 Ma [7]) identical to the stockwork wolframite but older than the Colettes (312 ± 8 Ma by Rb-Sr on whole rock [30]) and Beauvoir granites (~310 Ma), which are crosscut by the Mazet vein.…”

Section: Comparison With the Literaturesupporting

confidence: 53%

“…The presence of hubnerite as the only wolframite type in the Mazet veins was also reported [23]. More recently, however, work on the Echassieres W mineralization by Harlaux and coworkers [7,40] did not distinguish wolframite from the La Bosse stockwork from that of the Mazet veins, which led them to proposing a unique origin and age for the W mineralization in the district. This apparent contradiction may have arisen from the fact that, historically, the ores from the La Bosse stockwork and from the Mazet veins were sorted in the same site (Montmins [23]).…”

Section: Comparison With the Literaturementioning

confidence: 89%

“…The amount of Nb 2 O 5 varies within each of the three groups; most of the values for the Mazet vein data are below the maximum detection limits (0.12 wt.%), while for wolframite a and b they mostly exceed detection limits, with the latter commonly greater than 1 wt.%. Interestingly, wolframite b is zoned with respect to Nb (Figure 6b; see also [40] Figure 2). displays a euhedral core with fibrous overgrowth (XPL).…”

Section: Wolframitementioning

confidence: 93%

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Multiple Generations of Wolframite Mineralization in the Echassieres District (Massif Central, France)

et al. 2019

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The Echassières district in central France contains complex rare-element ore deposits, whose formation is related to exotic igneous events and several hydrothermal episodes that are not entirely understood to date. Tungsten mineralization consists of three generations of wolframite, characterized by distinct Fe/Mn ratios (8.4; 3.5 and 0.3, for wolframite a, b and c, respectively), formed during three separate hydrothermal episodes related to the Variscan orogeny. Wolframite a occurs in quartz veins of the La Bosse stockwork where it crystallized before the Barrovian metamorphism that affected these veins and the host rock. After metamorphism, before intrusion of the Beauvoir and Colettes granites, wolframite b crystallized in the stockwork during massive topazification. High concentrations of wolframite c occur in the proximal quartz veins in the Mazet area, while only scant amounts are found in the La Bosse stockwork. In both settings, wolframite c precipitated from the fluid responsible for greisen alteration that massively affected the Beauvoir granite. In the La Bosse stockwork, greisen alteration is characterized by hydrothermal topaz that is texturally and chemically distinct from that precipitated during topazification. Supergene alteration responsible for kaolinization of Beauvoir and Colettes granites caused remobilization of a non-negligible amount of tungsten (W) during replacement of wolframite by W-rich goethite in all units of the Echassières district. This model for multiple W mineralizing events is novel and can prove essential in distinguishing potential economic deposits worldwide.

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Section: Comparison With the Literaturesupporting

confidence: 53%

Section: Comparison With the Literaturementioning

confidence: 89%

Section: Wolframitementioning

confidence: 93%

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Multiple Generations of Wolframite Mineralization in the Echassieres District (Massif Central, France)

et al. 2019

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“…The separated and fitting of the peaks of O 1s on calcite surface after the conditioning of the mixed depressant are shown in Figure 12. According to the NIST XPS Databases and related literatures [42,46,47], the peak at 531.22 eV was contributed by the oxygen in the CO 3 2− of the calcite.…”

Section: Xps Analysismentioning

confidence: 99%

“…Scheelite and wolframite are the two most important tungsten resources in nature. Since the wolframite ((Fe, Mn)WO 4 ) is more easily enriched by gravity methods and is easier to exploit and utilize, the wolframite resources have been exhausted [1][2][3]. Therefore, the exploitation and high standards utilization of scheelite (CaWO 4 ) are receiving more and more attention [4,5].…”

Section: Introductionmentioning

confidence: 99%

Use of Sodium Hexametaphosphate and Citric Acid Mixture as Depressant in the Flotation Separation of Scheelite from Calcite

et al. 2019

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The floatability of scheelite and calcite in the presence of single depressant (SHMP or H 3 Cit) and mixed depressant (SHMP/H 3 Cit) was studied by microflotation experiments and artificial mixed mineral experiments. Solution chemical calculation, zeta potential tests, thermodynamic analysis and XPS analysis were used to explain the relevant depressive mechanism. Mixed depressant (SHMP/H 3 Cit) exhibited excellent selective depressive effect on calcite. The optimal molar ratio of SHMP to H 3 Cit was 1:4. The depressant SHMP and H 3 Cit can be chemically bonded with Ca 2+ to form CaHPO 4 and Ca 3 (Cit) 2 at pH 8. The CaHPO 4 was more easily formed than Ca 3 (Cit) 2 on the mineral surface, which indicated that the depressive effect of SHMP was stronger than H 3 Cit. The SHMP and H 3 Cit of the mixed depressant were co-adsorbed on the calcite surface, while the H 3 Cit of the mixed depressant was weakly adsorbed on the scheelite surface. The mixed depressant can significantly improve the separation efficiency of scheelite from calcite. Sodium silicate (water glass) has been widely used as a depressant in flotation of scheelite from calcite [23]. However, sodium silicate also has some disadvantages as a depressant, such as frequent acidification, narrow optimum pH range, and weak selectivity. Single phosphates are also used for calcite depressants, but they are often limited by their weak selectivity, so mixed reagents are often required [24]. Organic macromolecular depressants have also received attention. Zhang et al. studied the role of sodium polyacrylate in flotation separation of scheelite and calcite [25]. However, sodium polyacrylate also has an unfavorable inhibitory effect on scheelite over a wide range of pH conditions, with poor flotation selectivity. Carboxymethyl cellulose has also been studied as a depressant in the flotation separation of scheelite from calcite [26], but it is difficult to dissolve carboxymethyl cellulose at room temperature, which is not conducive to flotation. In view of the shortcomings of the above single depressants, such as poor collecting ability, weak selectivity, and large dosage, it is often necessary to use mixed depressant to achieve flotation separation between scheelite and gangue minerals.Sodium hexametaphosphate (SHMP) is a clean, non-toxic phosphate that is widely used in the food industry and the chemical industry [27,28]. It can be used as a chelating reagent for metal ions, an adhesive, and a swelling reagent [29,30]. It is also widely used in the mineral processing industry, especially in the floatation. SHMP is used as a dispersant and depressant of minerals in flotation [31][32][33][34][35]. In addition, SHMP can be used to depress calcite [24], but it also has a strong depressive effect on scheelite. Citric acid (H 3 Cit) is also a clean, non-toxic organic acid and is a tricarboxylic acid compound. It is mainly used in the food industry, chemical industry, textile industry, cosmetics and pharmaceutical industries [36][37][38]. Citric acid can be used as depress...

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Formation and evolution of multistage hydrothermal fluids in the Baishitouwa quartz–wolframite vein‐type deposit in the southern Great Xing'an Range tungsten belt, NE China: Constraints from individual fluid inclusion LA‐ICP‐MS analysis

et al. 2023

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Revealing hydrothermal evolution from the early oxide to late carbonate stages for quartz-wolframite vein-type deposits is essential for understanding the ore-forming process. In this study, we choose the Baishitouwa tungsten polymetallic deposit located in the southern Great Xing'an Range tungsten belt as a case study, and present detailed deposit geology and in situ fluid inclusion (FI) analyses including microthermometry, laser Raman spectra, and LA-ICP-MS microanalysis to address this issue. Four stages of hydrothermal activity were identified: (1) quartz-wolframite (I),(2) quartz-wolframite (II)-pyrite-chalcopyrite, (3) quartz-polymetallic sulphides, and (4) quartz-carbonate. Four types of FIs were recognized: CO 2 -rich, CO 2 -bearing, liquid-rich, and brine inclusions. Microthermometric data showed that the homogenization temperatures and salinities from the early to late stages are 380-460 C,

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Tracing metal sources in peribatholitic hydrothermal W deposits based on the chemical composition of wolframite: The example of the Variscan French Massif Central

Cited by 63 publications

References 90 publications

Multiple Generations of Wolframite Mineralization in the Echassieres District (Massif Central, France)

Multiple Generations of Wolframite Mineralization in the Echassieres District (Massif Central, France)

Use of Sodium Hexametaphosphate and Citric Acid Mixture as Depressant in the Flotation Separation of Scheelite from Calcite

Formation and evolution of multistage hydrothermal fluids in the Baishitouwa quartz–wolframite vein‐type deposit in the southern Great Xing'an Range tungsten belt, NE China: Constraints from individual fluid inclusion LA‐ICP‐MS analysis

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