Petrological, mineralogical, fluid inclusion, and stable isotope studies of the Gies gold-silver telluride deposit, Judith Mountains, Montana

Zhang, Xiaomao; Spry, Paul G.

doi:10.2113/gsecongeo.89.3.602

Cited by 42 publications

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“…No tluid inclusion data are available from the Mayflower mine. However, the presence of coexisting sylvanite and petzite in veins that contain benleonardite implies, on the basis of the experimental data of Cabri (1965), a maximum temperature of formation of these tellurides and associated benleonardite of 170~ Fluid inclusion data on stage III quartz that contains benleonardite at the Gies deposit by Zhang and Spry (1994) suggests benleonardite and the cervelleite-like mineral formed between 195 and 250~ Note that mineral assemblages associated with mineral B (cervelleite) at Ivigtut suggested to Karup-Mr (1976) that it formed at <230~ This overlaps the fluid inclusion temperature range observed by Zhang and Spry (1994) at Gies and the proposed range of stability of the cervelleite-like mineral.…”

Section: Discussionmentioning

confidence: 99%

“…In that study it was reported that the species occurred as monomineralic grains up to 40 gm wide or as laths up to 60 gm in length and that it was associated with silver, acanthite, hessite, cervelleite (Ag4TeS), pyrite and sphalerite. Three incompletely characterized phases mentioned in the literature which may be akin to benleonardite are mineral X of Aksenov et al (1969) from the Zyranov deposit, Russia, mineral C of Karup-Mr and Pauly (1979) from Ivigtut, Greenland, and 'unnamed mineral 2' of Zhang and Spry (1994) from the Gies deposit, Montana.…”

Section: Introductionmentioning

confidence: 99%

“…60, pp. 9 Copyright the Mineralogical Society fluid inclusion studies of Zhang and Spry (1994) for the Gies deposit.…”

Section: Introductionmentioning

confidence: 99%

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Two new occurrences of benleonardite, a rare silver-tellurium sulphosalt, and a possible new occurrence of cervelleite

Spry

Thieben

1996

Mineral. mag.

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Benleonardite, ideally Agg(Sb,As)Te253, occurs in ore specimens from the Mayflower and Gies epithermal gold-silver telluride deposits in Montana commonly spatially associated with hessite and tetrahedrite. In these deposits, it is Cu-bearing (up to 2.7 wt.%) and exhibits a slight deficiency in Ag+Cu coupled with a slight excess in S. A cervelleite-like mineral coexists with benleonardite at Mayflower and is unusual in composition in that it is Se-bearing suggesting the possibility of solid solution with aguilarite (Ag4SeS).

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Two new occurrences of benleonardite, a rare silver-tellurium sulphosalt, and a possible new occurrence of cervelleite

Spry

Thieben

1996

Mineral. mag.

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“…Available infor mation suggests that any drastic change in fluid conditions, including a decrease in temperature, wallrock sulfidation, phase separation, pH shifts, and (or) redox change, can destabilize telluriumbearing complexes (for example, Cooke and McPhail, 2001;Ciobanu and others, 2006;Maslennikov and others, 2013). Most hypogene telluride minerals probably were deposited at temperatures of between 300 and 100 degrees Celsius ( o C) (for example, Zhang and Spry, 1994;Shackleton and others, 2003), although in some magmatic copper-nickel-PGM deposits, palladium-and (or) lead-bearing tellurides are stable at temperatures of 400 o C (Vymazalová and Drábek, 2011).…”

Section: Geology Geochemistrymentioning

confidence: 99%

“…In the gold-silver-tellurium system alone, 11 different tellurium-bearing phases have been identified (Zhang and Spry, 1994). Grundler and others (2013) indicate that calaverite typically coexists with native gold or the silverbearing tellurides krennerite and petzite, whereas native tellurium is more commonly associated with other silver-bearing tellurides, such as hessite, stutzite, and sylvanite.…”

Section: Mineral Namementioning

confidence: 99%

Tellurium

Goldfarb¹,

Berger²,

George³

et al. 2017

Professional Paper

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Division; available at http://periodic.lanl.gov/images/periodictable.pdf.Cover. Tellurium is a critical component for the development of efficient thin-film photovoltaic cells that are needed for the production of electricity from sunlight. A 2-megawatt, ground-mounted solar photovoltaic array occupies the site of a former landfill at Fort Carson, Colo. Photograph from the U.S. Department of Energy Western Area Power Administration. For an overview of USGS information products, including maps, imagery, and publications, visit https://store.usgs.gov/.

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Chemical and Pb isotope composition of phenocrysts from bentonites constrains the chronostratigraphy around the Cretaceous‐Paleogene boundary in the Hell Creek region, Montana

Ickert

Mulcahy

Sprain

et al. 2015

Geochem Geophys Geosyst

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An excellent record of environmental and paleobiological change around the CretaceousPaleogene boundary is preserved in the Hell Creek and Fort Union Formations in the western Williston Basin of northeastern Montana. These records are present in fluvial deposits whose lateral discontinuity hampers long-distance correlation. Geochronology has been focused on bentonite beds that are often present in lignites. To better identify unique bentonites for correlation across the region, the chemical and Pb isotopic composition of feldspar and titanite has been measured on 46 samples. Many of these samples have been dated by 40 Ar/ 39 Ar. The combination of chemical and isotopic compositions of phenocrysts has enabled the identification of several unique bentonite beds. In particular, three horizons located at and above the Cretaceous-Paleogene boundary can now be traced-based on their unique compositions-across the region, clarifying previously ambiguous stratigraphic relationships. Other bentonites show unusual features, such as Pb isotope variations consistent with magma mixing or assimilation, that will make them easy to recognize in future studies. This technique is limited in some cases by more than one bentonite having compositions that cannot be distinguished, or bentonites with abundant xenocrysts. The Pb isotopes are consistent with a derivation from the Bitterroot Batholith, whose age range overlaps that of the tephra. These data provide an improved stratigraphic framework for the Hell Creek region and provide a basis for more focused tephrostratigraphic work, and more generally demonstrate that the combination of mineral chemistry and Pb isotope compositions is an effective technique for tephra correlation.

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Petrological, mineralogical, fluid inclusion, and stable isotope studies of the Gies gold-silver telluride deposit, Judith Mountains, Montana

Cited by 42 publications

References 0 publications

Two new occurrences of benleonardite, a rare silver-tellurium sulphosalt, and a possible new occurrence of cervelleite

Two new occurrences of benleonardite, a rare silver-tellurium sulphosalt, and a possible new occurrence of cervelleite

Tellurium

Chemical and Pb isotope composition of phenocrysts from bentonites constrains the chronostratigraphy around the Cretaceous‐Paleogene boundary in the Hell Creek region, Montana

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