Rare earth element and isotope (C, O, Sr) characteristics of hydrothermal carbonates: genetic implications for dolomite-hosted talc mineralization at Göpfersgrün (Fichtelgebirge, Germany)

Hecht, Lutz; Freiberger, R.; Gilg, H. Albert; Grundmann, Günter; Kostitsyn, Yu. A.

doi:10.1016/s0009-2541(98)00144-2

Cited by 127 publications

(80 citation statements)

References 33 publications

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“…They were produced by mixing of deep brines and meteoric waters with the proportion of the latter increasing with time and were channeled along extensional structures. Talc mineralization at Göpfersgrün in Germany also occurred at low X CO2 ≈ 0.05 and at temperatures between 250 and 400°C by hydrothermal alteration of dolomitic marble along a major fault zone (Hecht et al, 1999).…”

Section: Genetic Constraints Of Talcmentioning

confidence: 98%

Fluid inclusions and their stable isotope geochemistry of the carbonate-hosted talc deposits near the Cretaceous Muamsa Granite, South Korea

Shin

Lee

2006

Geochem. J.

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Microthermometric and stable isotope studies of fluid inclusions were conducted for the Poongjeon talc deposit which formed as alteration products of calc-silicate minerals during the retrograde stage of contact metamorphism related to the intrusion of the Cretaceous Muamsa Granite of South Korea. Two types of quartz vein are observed in the deposit. Vein I, which occurs in marble, is characterized by both mixing and unmixing process of fluid inclusions. Repeated boiling of carbonic fluids produced high X CO2 fluids abundantly and low X CO2 or aqueous fluids a little. Occasionally mixing took place between halite ± sylvite-bearing fluids and carbonic fluids. As for vein II, which occurs typically at points of amphibolite-metapelite contact, the fluid mixing model can be applied to the coexistence of abundant CH 4 ± H 2 O, H 2 O-CO 2 -CH 4 fluids with variable CH 4 /CO 2 ratios (X CH4 > 0.1), and minor high X CO2 fluid inclusions. The CH 4 -rich inclusions seem to be derived from the reheating of C-bearing metapelite during contact metamorphism.Occurrences of halite ± sylvite-bearing inclusions along trails in both vein I and II are chronologically behind other primary inclusions and are closely related to the talc mineralization. The mineralizing fluids would have been derived directly from a water-saturated crystallizing melt and the entrapment occurred between 150 and 700 bars at 260°-390°C. The δ 13 C CO2 values, 0.1-2.4‰, of inclusion fluids of vein I seem to have resulted from the isotopic exchange of magmatic carbon with 13 C-enriched CO 2 liberated from the decarbonation for calc-silicate formation. Distinctly lower δ 13 C CO2 values, -3.5 to -1.7‰, in vein II could have originated from the strong effect of metasediment-derived fluids. Higher δ 18 O H2O values of vein I and lower δD values of vein II, both of which belong to the magmatic water range, seem to have similar evolution history as δ 13 C values. Geologic structures such as faults and contacts between different rock units seem to have promoted infiltration, mixing, and unmixing of fluids of diverse origins.

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Section: Genetic Constraints Of Talcmentioning

confidence: 98%

Fluid inclusions and their stable isotope geochemistry of the carbonate-hosted talc deposits near the Cretaceous Muamsa Granite, South Korea

Shin

Lee

2006

Geochem. J.

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“…The negative Ce-anomaly observed in fibrous calcite can indicate a seawater component in the fluid (Hecht et al 1999;Wamada et al 2007). Alternatively, the presence of both negative Ce-anomaly and positive Eu-anomaly found in granular calcite from median of composite vein suggest the mixing of several types of fluids which were formed under various redox conditions (Möller et al 1991).…”

Section: Trace Element Signature Of Hydrothermal Fluidmentioning

confidence: 99%

Genesis of Syntectonic Hydrothermal Veins in the Igneous Rock of Teschenite Association (Outer Western Carpathians, Czech Republic): Growth Mechanism and Origin of Fluids

Urubek¹,

Dolníček²,

Kropáč³

2015

Geologica Carpathica

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Hydrothermal mineralization hosted by the Lower Cretaceous igneous rock of the teschenite association at Jasenice (Silesian Unit, Flysch Belt, Outer Western Carpathians) occurs in two morphological types -irregular vein filled by granular calcite and regular composite vein formed by both fibrous and granular calcite and minor chlorite, quartz, and pyrite. Crosscutting evidence indicates that the granular veins are younger than the composite vein. The composite vein was formed by two mechanisms at different times. The arrangement of solid inclusions in the marginal fibrous zone suggests an episodic growth by the crack-seal mechanism during syntectonic deformation which was at least partially driven by tectonic suction pump during some stages of the Alpine Orogeny. Both the central part of the composite vein and monomineral veins developed in a brittle regime. In these cases, the textures of vein suggest the flow of fluids along an open fracture. The parent fluids of both types of vein are characterized by low temperatures (Th =66-163 °C), low salinities (0.4 to 3.4 wt. % NaCl eq.), low content of strong REE-complexing ligands, and δ 18 O and δ 13 C ranges of + 0.2/+12.5 ‰ SMOW and -11.8/-14.1 ‰ PDB, respectively. The parent fluids are interpreted as the results of mixing of residual seawater and diagenetic waters produced by dewatering of clay minerals in the associated flysch sediments. The flow of fluids was controlled by tectonic deformation of the host rock.

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“…A formação de jazidas de talco a partir de dolomitos implica percolação de fluidos aquosos em volume suficiente para promover o aporte de SiO 2 e a retirada de Ca e CO 2 , transformando a rocha cálcio-magnesiana carbonática anidra em magnesiana silicosa hidratada. A maioria dos depósitos de talco descritos na literatura está relacionada a rochas dolomíticas associadas a zonas de cisalhamento de amplitude regional (Blount e Vassiliou, 1980;Prochaska, 1989;Anderson, Mogk, Childs, 1990;Prochaska, Mogessie, Raith, 1992;Schandl, Sharara, Gorton, 1999;Hecht et al, 1999; Tornos e Spiro, 2000; Shin e Lee, 2002), sendo menos freqüentes os estudos de jazidas ligadas a rochas metaultramáficas (e.g. El-Sharkawy, 2000).…”

Section: Metamorfismo E Talcificação No Grupo Itaiacocaunclassified

“…Em alguns casos, a fonte dos fluidos é atribuída a intrusões graníticas (Prochaska et al, 1992;El-Sharkawy, 2000;Shin e Lee, 2002). As temperaturas estimadas por meio de inclusões fluidas, isótopos estáveis ou equilíbrios termodinâmicos de reações minerais são inferiores a 500 o C e as frações molares de CO 2 em geral são baixas (175 a 350 o C, Prochaska et al, 1992; T max < 500 o C e X CO2 < 0,2, Schandl, Sharara, Gorton, 1999; 250 a 400 o C, baixa X CO2 , Hecht et al, 1999; 380 a 400 o C, Shin e Lee, 2002). Há registros de talcificação retrometamórfica sobreposta a paragêneses cálcio-silicáticas de temperaturas mais elevadas (Schandl et al, 1999;Shin e Lee, 2002).…”

Section: Metamorfismo E Talcificação No Grupo Itaiacocaunclassified

“…Nos depósitos de talco de Winterboro (Alabama, EUA), Blount e Vassiliou (1980) sugerem uma substituição do metadolomito por talco a baixas temperaturas através de soluções hidrotermais infiltradas ao longo de fraturas. Em algumas ocorrências, a talcificação se seguiria imediatamente ao processo de dolomitização (Hecht et al, 1999 …”

Section: Metamorfismo E Talcificação No Grupo Itaiacocaunclassified

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As jazidas de talco no contexto da história metamórfica dos metadolomitos do grupo Itaiacoca, PR

Szabó

Andrade

Guimarães

et al. 2006

Geol. USP, Sér. cient.

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Rare earth element and isotope (C, O, Sr) characteristics of hydrothermal carbonates: genetic implications for dolomite-hosted talc mineralization at Göpfersgrün (Fichtelgebirge, Germany)

Cited by 127 publications

References 33 publications

Fluid inclusions and their stable isotope geochemistry of the carbonate-hosted talc deposits near the Cretaceous Muamsa Granite, South Korea

Fluid inclusions and their stable isotope geochemistry of the carbonate-hosted talc deposits near the Cretaceous Muamsa Granite, South Korea

Genesis of Syntectonic Hydrothermal Veins in the Igneous Rock of Teschenite Association (Outer Western Carpathians, Czech Republic): Growth Mechanism and Origin of Fluids

As jazidas de talco no contexto da história metamórfica dos metadolomitos do grupo Itaiacoca, PR

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