Clausthalite (PbSe) and tiemannite (HgSe) from the type locality: New observations and implications for metallogenesis in the Harz Mountains, Germany

Cabral, Alexandre Raphael; Kerkhof, Alfons M. van den; Sosa, Graciela; Nolte, Nicole; Ließmann, Wilfried; Lehmann, Bernd

doi:10.1016/j.oregeorev.2018.09.027

Cited by 5 publications

(1 citation statement)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The conditions of formation of the Se-bearing paragenesis in Rincón Blanco require low temperatures, lower than 133 °C, because of the lack of lamellae in naumannite (Cabral et al 2018). On the other hand, we know that berzelianite associated with bellidoite is stable below 123 °C (Bernardini and Catani 1968;Chakrabarti and Laughlin 1981;Pirard and Hatert 2008), that the presence of umangite indicates a temperature of the formation below 112 °C (Chakrabarti and Laughlin 1981) and that athabascaite supposedly crystallizes at temperatures below 100 °C since attempts to synthesize this mineral (Harris et al 1970b) were unsuccessful above that temperature.…”

Section: Conditions Of Formationmentioning

confidence: 99%

Mineralogy of the Rincón Blanco selenide occurrence, La Rioja, Argentina

Márquez-Zavalía¹,

Galliski²,

Škácha³

et al. 2021

J. Geosci.

View full text Add to dashboard Cite

is a small selenide occurrence situated to the WNW of Jagüé, a small town of the General Sarmiento department, La Rioja province, Argentina. This occurrence, also called El Chire in recent years, is located (28°35'46.10"S, 68°44'35.78"W, 3120 m. a. s. l.) in the Precordillera environment, to the furthermost southwestern corner of the selenium ore district of Los Llantenes, defined as one of the representative metallogenic belts of the Gondwanic episodes. The selenide minerals occur as veinlets up to few centimeters or as patches or fine inclusions, widespread in calcite. We have identified eleven hypogene Se-bearing minerals (naumannite, tiemannite, chrisstanleyite, jagüéite, eucairite, clausthalite, fischesserite, umangite, athabascaite, berzelianite and bellidoite) mainly associated with gold, silver, hematite and various supergene minerals, including malachite, chalcomenite, and molybdomenite. The paragenesis should have formed from low temperature (< 133 °C), neutral to mildly alkaline pH and highly oxidizing fluids with increasing sulfur fugacity. The country-rock, rich in graptolite-fauna, could be considered, at least in part, the source for the Se and associated metals forming the minerals of this paragenesis, although this hypothesis has yet to be tested.

show abstract

Section: Conditions Of Formationmentioning

confidence: 99%

Mineralogy of the Rincón Blanco selenide occurrence, La Rioja, Argentina

Márquez-Zavalía¹,

Galliski²,

Škácha³

et al. 2021

J. Geosci.

View full text Add to dashboard Cite

show abstract

Germanium and precious metals (Ag–Au–Pt–Pd) at low temperature: the hematite–carbonate–selenide vein system of Tilkerode, Harz Mountains, Germany

Lohmeier

Cabral

Ehling³

et al. 2023

Miner Deposita

View full text Add to dashboard Cite

At the historical Eskeborner Berg underground workings at Tilkerode (Eastern Harz Mountains, Germany), Fe was mined from a carbonate–hematite vein system that was locally enriched in selenide minerals. Clausthalite [PbSe] was the most abundant selenide mineral in a carbonate matrix with laths of specular hematite. To date, the selenide-bearing carbonate–hematite vein system at Tilkerode has not been geochemically investigated. Here, we present the first whole-rock chemical data for a wide suite of trace elements. The following metals are enriched relative to bulk continental crust (orders of magnitude in parentheses): Se (>105), Hg (>104), Ag and Pb (103), Au, Bi, Pt, Ge, Te, Pd and Cd (102). Samples from Tilkerode have up to 2640 ppm Ag, 338 ppm Ge, 1560 ppb Au, 970 ppb Pt and 365 ppb Pd, with Pt/Pd > 1, and a significant positive correlation of Ge vs. (Pd+Pt). The selenide mineralisation took place below 112 °C, the maximum temperature stability of umangite [Cu3Se2]. Our data indicate there is potential for prospecting Ge and precious metals in low-temperature vein systems.

show abstract