Comparative Reflections on Four Alpine Pb-Zn Deposits

Brigo, L.; Kostelka, L.; Omenetto, Paolo; Schneider, Hans-Jochen; Schroll, E.; Schulz, O.; Štrucl, I.

doi:10.1007/978-3-642-66806-7_18

Cited by 32 publications

(22 citation statements)

References 13 publications

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“…Bleiberg, Raibl, Selafossa, Mezica (Brigo et al 1977;Zee and Bechst/idt 1994), the Swiss Atps, e.g. Davos, Hondrich near Spiez (Oberh/insli et al 1985) as well as in non-Alpine areas, e.g.…”

Section: Significance Of the Lengenbach Mineralisationmentioning

confidence: 97%

Geochemistry and genesis of the Lengenbach Pb-Zn-As-Tl-Ba-mineralisation, Binn Valley, Switzerland

Hofmann

Knill

1996

Mineral. Deposita

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Abstract. The Lengenbach Pb-Zn-As-TI-Ba mineralisation is located in Triassic dolostones of the Penninic zone in the Swiss Alps where Alpine metamorphism reached upper greenschist to lower amphibolite grade. Geochemical data are used to constrain the origin of this unique occurrence. Two metamorphic redox environments are present: the As(III)-rich zone is controlled by barite-pyrite while the reduced zone contains graphite or pyrrhotitepyrite and formally zerovalent As. The As(III)-rich zone is characterised by a mineral assemblage consistent withfO2 in the stability field of barite + pyrite. An As-(Pb, T1)-rich sulphide melt coexisted with a hydrothermal fluid at > 300 °C in this zone. Mineralised dolostones are anomalous in As, Pb, Ag, T1, Hg, Zn, Ba, Cd, Fe, Cu, Mo, U, V, B, Ga, Cr and possibly Sn and Au (in order of decreasing enrichment). As, Pb and Zn are present in the 0.1 to 1% range, T1 and Ag reach several hundred ppm. Uraninite is concentrated in silicate-rich bands and yields a late Alpine U-Pb age of 18.5 + 0.5 Ma. Pb-and S isotopic variations are interpreted by metamorphic overprinting and re-equilibration within an isochemically metamorphosed mineralisation. Hydrothermal sulphides are more strongly affected by uranogenic Pb than massive Pb-As-sulphides representing a former sulphide melt. The least overprinted mineralisation is characterised by 2°6pb/2°*pb = 18.44 -18.56, 2°TPb/2°4Pb = 15.60 -15.75, 2°Spb/2°4pb = 38.44 -38.84 and ~534S (sulphide) = -25 + 2%0. S isotopic variations are largely a result of sulphide-sulphate re-equilibration yielding temperatures of 450 + 30°C. SVSr/86Sr ratios of mineralised samples are lower than or equal to host dolostones, precluding major infiltration of basement-derived fluids during Alpine metamorphism. The Sr source (87Sr/86Sr close to 0.708) probably was seawater with a radiogenic, detrital mineral component. The genesis of the unique Lengenbach mineralisation is interpreted as the result of isochemical metamorphic overprinting of a carbonate hosted stratiform sulphide mineralisation. Well-crystallised sulphide minerals in Correspondence to: B.A. Hofmann fissures and druses formed during retrograde cooling of a sulphide melt in equilibrium with a hydrothermal fluid. The primary mineralisation was probably formed at or close below the sea floor and fed by sulphide-poor hydrothermal fluids. Sulphide was largely derived from seawater by open system bacterial sulphate reduction. U, V and Mo may be seawater-derived.

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Section: Significance Of the Lengenbach Mineralisationmentioning

confidence: 97%

Geochemistry and genesis of the Lengenbach Pb-Zn-As-Tl-Ba-mineralisation, Binn Valley, Switzerland

Hofmann

Knill

1996

Mineral. Deposita

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“…The broader Drava Valley is enriched with trace elements such as Pb, Zn, Cu, As, and Cd. Major deposits in Slovenia are found in Triassic sedimentary rock near Mežica (mostly limestone and dolomite), containing Pb and Zn ore bodies (galena and sphalerite) (Brigo et al, 1977;Drovenik et al, 1980;Mioč et al, 1983;Štrucl, 1984;Vreča et al, 2001). However, many smaller metal ore deposits can also be found outside the metal-rich Mežica area, particularly within the metamorphic series of gneiss, amphibolite, and chlorite-amphibole schist (Pohorje and Kozjak Mts.).…”

Section: Introductionmentioning

confidence: 99%

Assessment of the natural and anthropogenic sources of chemical elements in alluvial soils from the Drava River using multivariate statistical methods

Šajn

Halamić

Peh

et al. 2011

Journal of Geochemical Exploration

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“…Raibl beds) and the ores occur as stratabound bodies, whereas mineralization in the Velence Mts is characteristically vein-type, hosted by granite. Mineralization in the Alpine deposits often occurs as matrix of tectonic breccias, but also forms fissure filling, karst filling or fault-related epigenetic ore bodies (Brigo et al 1977). This suggests that the diagenetic process and the carbonate host rock are not truly decisive factors for governing ore deposition, and mineralization can occur in very different forms and in different type of rocks.…”

Section: Model Of Formation Of Lead-zinc Deposits In the Pannonian Bamentioning

confidence: 99%

“…Observations presented in this paper argue for an epigenetic, Mid-, Late-Triassic ore-forming event in the Velence Mts and the Szabadbattyán Block (209-232 Ma). Epigenetic lead-zinc deposits north of the PABL occur in the Late-Triassic (Carnian -228-216 Ma;Brigo et al 1977).…”

Section: Model Of Formation Of Lead-zinc Deposits In the Pannonian Bamentioning

confidence: 99%

Triassic fluid mobilization and epigenetic lead-zinc sulphide mineralization in the Transdanubian Shear Zone (Pannonian Basin, Hungary)

Benkó¹,

Molnár²,

Lespinasse³

et al. 2014

Geologica Carpathica

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Abstract:A combined fluid inclusion, fluid inclusion plane, lead isotope and K/Ar radiometric age dating work has been carried out on two lead-zinc mineralizations situated along the Periadriatic-Balaton Lineament in the central part of the Pannonian Basin, in order to reveal their age and genetics as well as temporal-spatial relationships to other lead-zincfluorite mineralization in the Alp-Carpathian region. According to fluid inclusion studies, the formation of the quartzfluorite-galena-sphalerite veins in the Velence Mts is the result of mixing of low (0-12 NaCl equiv. wt. %) and high salinity (10-26 CaCl 2 equiv. wt. %) brines. Well-crystallized (R3-type) illite associated with the mineralized hydrothermal veins indicates that the maximum temperature of the hydrothermal fluids could have been around 250 °C. K/Ar radiometric ages of illite, separated from the hydrothermal veins provided ages of 209-232 Ma, supporting the Mid-to Late-Triassic age of the hydrothermal fluid flow. Fluid inclusion plane studies have revealed that hydrothermal circulation was regional in the granite, but more intensive around the mineralized zones. ) form a tight cluster indicating similar, upper crustal source of the lead in the two mineralizations. The nature of mineralizing fluids, age of the fluid flow, as well as lead isotopic signatures of ore minerals point towards a genetic link between epigenetic carbonate-hosted stratiform-stratabound Alpine-type lead-zinc-fluorite deposits in the Southern and Eastern Alps and the studied deposits in the Velence Mts and at Szabadbattyán. In spite of the differences in host rocks and the depth of the ore precipitation, it is suggested that the studied deposits along the Periadriatic-Balaton Lineament in the Pannonian Basin and in the Alps belong to the same regional scale fluid flow system, which developed during the advanced stage of the opening of the Neo-Tethys Ocean. The common origin and ore formation process is more evident considering results of large-scale palinspastic reconstructions. These suggest, that the studied deposits in the central part of the Pannonian Basin were located in a zone between the Eastern and Southern Alps until the Early Paleogene and were emplaced to their current location due to northeastward escape of large crustal blocks from the Alpine collision zone.Key words: Triassic, Velence Mts, Szabadbattyán, Periadriatic-Balaton Lineament System, lead isotopes, fluid inclusions, Alpine-type epigenetic lead-zinc mineralization.netic at Recsk and in the Velence Mts) is clearly or apparently controlled by the repeated reactivation of this fault system.Along the eastern segment of the PABL, in the central part of the Pannonian Basin two Paleozoic, allochthonous complexes, the Szabadbattyán Block and the Velence Mts crop out. The western part of the Velence Mts is built up of early Permian monzogranite, which is the host of vein-type fluorite-galena-sphalerite-calcite mineralization (hereinafter basemetal-fluorite veins). The near-by (30 km) Szabadbattyán Block is com...

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Comparative Reflections on Four Alpine Pb-Zn Deposits

Cited by 32 publications

References 13 publications

Geochemistry and genesis of the Lengenbach Pb-Zn-As-Tl-Ba-mineralisation, Binn Valley, Switzerland

Geochemistry and genesis of the Lengenbach Pb-Zn-As-Tl-Ba-mineralisation, Binn Valley, Switzerland

Assessment of the natural and anthropogenic sources of chemical elements in alluvial soils from the Drava River using multivariate statistical methods

Triassic fluid mobilization and epigenetic lead-zinc sulphide mineralization in the Transdanubian Shear Zone (Pannonian Basin, Hungary)

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