Analogues germanif�res et gallif�res des silicates et oxydes dans les gisements de zinc des Pyr�n�es centrales, France; argutite et carboirite, deux nouvelles esp�ces min�rales

Johan, Zdeněk; Oudin, Elisabeth; Picot, Paul

doi:10.1007/bf01084764

Cited by 33 publications

(19 citation statements)

References 7 publications

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“…No silicate mineral was observed, neither in XRF maps ( Figure S1) nor optical and SEM images (Figure 8 and Figure S1). A previous study on the argut deposit in the central Pyrenees (France) revealed the presence of the micro-inclusion of argutite associated with sphalerite [33]. This study also revealed a whole set of silicate mineral where Si was replaced by Ge (Ge > 1%).…”

Section: Implications For the Conditions Of Sphalerite Formationmentioning

confidence: 60%

Characterization of Germanium Speciation in Sphalerite (ZnS) from Central and Eastern Tennessee, USA, by X-ray Absorption Spectroscopy

et al. 2017

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X-ray absorption near edge structure (XANES) spectroscopy was used on zoned sphalerites (ZnS) from two world-class Mississippi Valley Type deposits, the Central and Eastern Tennessee Mining district, USA, in order to investigate germanium oxidation states. Due to the low germanium concentrations of these samples, it was necessary to perform the X-ray absorption spectroscopy (XAS) in fluorescence mode. The overlapping of the Zn Kβ and Ge Kα emission lines meant that a high energy-resolution was required. This was achieved using crystal analysers and allowed a bandwidth of 1.3 eV to be obtained. Experimental spectra were compared to XANES calculations and three configurations of germanium incorporation into sphalerite were identified. The first two, the most prevalent, show germanium (II) and (IV) surrounded by sulphur atoms in tetrahedral coordination, suggesting the replacement of Zn by Ge. In the third configuration, germanium (IV) is surrounded by oxygen atoms. This third configuration is unexpected for a zinc sulphide mineral and it resembles that of argutite (GeO 2 ).

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Section: Implications For the Conditions Of Sphalerite Formationmentioning

confidence: 60%

Characterization of Germanium Speciation in Sphalerite (ZnS) from Central and Eastern Tennessee, USA, by X-ray Absorption Spectroscopy

et al. 2017

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“…Bernstein (1985) and Otteman and Nuber (1972) report solid solution between brunogeierite and magnetite because of frequently observed enrichment in Ge within magnetite. In Gabearing magnetite close to brunogeierite crystals, Ge is reported from Pyrenean deposits with concentrations exceeding 4,000 ppm (Johan et al, 1983). In addition, a large paragenesis of Geminerals is described (Johan et al, 1983;Oudin et al, 1988).…”

Section: The Role Of Metamorphism and Recrystallization In The Genesimentioning

confidence: 93%

“…In Gabearing magnetite close to brunogeierite crystals, Ge is reported from Pyrenean deposits with concentrations exceeding 4,000 ppm (Johan et al, 1983). In addition, a large paragenesis of Geminerals is described (Johan et al, 1983;Oudin et al, 1988). These observations could indicate that PAZ Ge-minerals result from the enrichment of a primary mineral (magnetite in the case of brunogeierite).…”

Section: The Role Of Metamorphism and Recrystallization In The Genesimentioning

confidence: 95%

“…More usually, whenever Ge is present, it is enriched in the sphalerite (ZnS) lattice rather than as independent Ge-minerals (Reyx, 1973;Johan et al, 1983;Laforet et al, 1981;Bernstein, 1985;Cook et al, 2009Cook et al, , 2015. These Geminerals may be brunogeierite (GeFe 2 O 4 ), argutite (GeO 2 ), Ge-chloritoid (carboirite, FeA1 2 GeO 5 (OH) 2 ), rare briartite (Cu 2 (Fe, Zn)GeS 4 ), as well as Ge-bearing lepidomelane, titanite, garnet, zoisite, chlorite, quartz, allanite, and magnetite (Laforet et al, 1981;Johan et al, 1983;Bernstein, 1985;Pouit and Bois, 1986;Johan and Oudin, 1986). The formation of Ge-minerals in the Pyrenean deposits is poorly documented until now except for Aye et al (1978) and Johan and Oudin (1986) who suggested a possible link with regional metamorphism, based on paragenetic analysis.…”

Section: Introductionmentioning

confidence: 99%

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Relationships between the occurrence of accessory Ge-minerals and sphalerite in Variscan Pb-Zn deposits of the Bossost anticlinorium, French Pyrenean Axial Zone: Chemistry, microstructures and ore-deposit setting

Cugerone

Cenki-Tok

Chauvet

et al. 2018

Ore Geology Reviews

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HAL is a multidisciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

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“…The association of NiCo and Ge-Ga minerals is constant in the Pyrenees mineralization (Johan et al 1983); -occurrence of celsianite (Ba feldspar) and abundant barite.…”

Section: Mineralogymentioning

confidence: 99%

Arrens Zn (Pb), Ba Devonian deposit, Pyrénées, France: an exhalative-sedimentary-type deposit similar to Meggen

Pouit

Bois²

1986

Mineral. Deposita

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Abstract. The Perrefitte anticlinorium district in the Paleozo[c province of the Pyrenees contains abundant mineral occurrences, prospects, and old mines in the upper volcano-sedimentary layer of the Ordovician and Devonian sediments which have been metamorphosed in the greenschist to amphibolite facies. Although of different lithologic environments, the mineralization shows, as everywhere in the Pyrenees, many common characteristics. However, the Arrens deposit outcropping over 5 km on both limbs of a syncline displays specific characteristics: abundant barite with lateral Zn (Pb) Ba zoning, exceptionally thick subreef (?) footwall limestone overlain by black siltstone, abundant Ba silicate, in particular celsianite, locally cymrite, and siliceous, sedimentary-hydrothermal gangue.Due to deformation, such as tight folds and flow cleavage, the paleogeography of the Arrens geological environment could not be precisely reconstructed. However, the deposit is very likely located in an unstable shelf zone. Lithology underwent many changes close to the synsedimentary faults including at Arrens a limestone shelf facies and some small basins of black siltstone, at the bottom of which mineralization occurs. As all the mineralization of the Pyrenees Paleozoic, the deposit is of the exhalative or hydrothermal sedimentary type and bears some analogies with other exhalative deposits throughout the world. (The word "exhalative" is etymologically related to gases. Although "hydrothermal" is a more exact word as it pertains to hot water, "exhalative" will be used in this paper, being of most current usage.)

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Analogues germanif�res et gallif�res des silicates et oxydes dans les gisements de zinc des Pyr�n�es centrales, France; argutite et carboirite, deux nouvelles esp�ces min�rales

Cited by 33 publications

References 7 publications

Characterization of Germanium Speciation in Sphalerite (ZnS) from Central and Eastern Tennessee, USA, by X-ray Absorption Spectroscopy

Characterization of Germanium Speciation in Sphalerite (ZnS) from Central and Eastern Tennessee, USA, by X-ray Absorption Spectroscopy

Relationships between the occurrence of accessory Ge-minerals and sphalerite in Variscan Pb-Zn deposits of the Bossost anticlinorium, French Pyrenean Axial Zone: Chemistry, microstructures and ore-deposit setting

Arrens Zn (Pb), Ba Devonian deposit, Pyrénées, France: an exhalative-sedimentary-type deposit similar to Meggen

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