Further evidence for a Jurassic mineralizing event in central Europe: K-Ar dating of hydrothermal alteration and fluid inclusion systematics in wall rocks of the Käfersteige fluorite vein deposit in the northern Black Forest, Germany

Meyer, M.; Brockamp, Olaf; Clauer, Norbert; Renk, A.; Zuther, Michael

doi:10.1007/s001260050277

Cited by 39 publications

(17 citation statements)

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“…Thus, the inferred timing for Aouli vein mineralization is constrained between the Permian and the Jurassic. This inferred time interval fits within the span of hydrothermal events dated by apatite fission track techniques at 250-210 Ma (Ghorbal et al 2008;Saddiqi et al 2009;Barbero et al 2011 (Meyer et al 2000;Sánchez et al 2006;Wolff et al 2015).…”

Section: Age Of Mineralizationmentioning

confidence: 69%

Geology, Fluid Inclusions, and Geochemistry of the Aouli Sulphide ± Fluorite ± Barite Vein Deposit (Upper Moulouya District, Morocco) and Its Relationships to Pangean Rifting and Opening of the Tethys and Central Atlantic Oceans

Bouabdellah¹,

Margoum²

2016

Mineral Deposits of North Africa

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The Aouli Pb-Zn ± F ± Ba deposit in the upper Moulouya district of central Morocco consists of an array of multi-kilometer, transtensional, sub-vertical veins grouped into four main systems referred to as Aouli, Ansegmir, Sidi Said, and Sidi Ayad. Collectively, these veins produced *10 Mt of ore at a grade of 5 % Pb. Host rocks are a succession of folded and low-to medium-grade metasedimentary and minor metavolcanic rocks of Cambro-Ordovician age locally intruded by the multiphase ca. *330-319 Ma Aouli batholith. The veins occur either within the Aouli granitic intrusion (i.e., Ansgemir), Cambro-Ordovician schistose pelites (i.e., Aouli, Sidi Said), or both (i.e., Sidi Ayad). Overall, the orebodies exhibit very low Zn/Pb ratios, and contain 150-600 g/t Ag and 200-700 g/t Bi. Hydrothermal alteration is weakly to moderately developed in the vicinity and surrounding the veins, and is dominated by intense silicification coupled with minor sericitization, both types being superimposed on regional propylitic alteration. The sulphide mineralization consists principally of varying proportions of galena and sphalerite, and to a much lesser extent chalcopyrite and pyrite. Gangue minerals include multiple generations of quartz and paragenetically later fluorite and barite. Combined fluid inclusion data together with stable and radiogenic isotopic constraints indicate that the Aouli vein-type sulphide ± fluorite ± barite mineralization formed during the Permian-Jurassic contemporaneously with Pangean rifting and subsequent opening of the Tethys and Central 291Atlantic oceans. Mixing at the basement-cover interface of an ascending, deep-seated fluid that equilibrated with Hercynian crystalline basement rocks, and formation and/or meteoric water, is proposed to have triggered ore deposition.

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Section: Age Of Mineralizationmentioning

confidence: 69%

Geology, Fluid Inclusions, and Geochemistry of the Aouli Sulphide ± Fluorite ± Barite Vein Deposit (Upper Moulouya District, Morocco) and Its Relationships to Pangean Rifting and Opening of the Tethys and Central Atlantic Oceans

Bouabdellah¹,

Margoum²

2016

Mineral Deposits of North Africa

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“…Due to the proximity of the Rhine graben, slight hydrothermal alteration could also have occurred later, with associated fluid migration along the faults. For instance, a period of hydrothermal alteration during the Cretaceous was identified in the Black Forest in the Käfersteige fluorite vein deposit near Pforzheim (Meyer et al 2000), and at the Caroline mine near Sexau (Hagedorn and Lippolt 1994).…”

Section: Discussionmentioning

confidence: 98%

“…The hydrothermal activity was found to have occurred about 145 Ma ago during the breakup of Pangaea, documenting an important step in the geological development of the European continent (Zuther and Brockamp 1988). Coeval ore mineralizations in the Black Forest have been described, for example, by Wernicke and Lippolt (1993) and Meyer et al (2000).…”

Section: Introductionmentioning

confidence: 95%

Authigenic sericite record of a fossil geothermal system: the Offenburg trough, central Black Forest, Germany

Brockamp

Clauer

Zuther

2003

International Journal of Earth Sciences

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A fossil geothermal area is hosted by the Carboniferous, Permian and Bunter sandstones of the Offenburg intramontane trough in the central Black Forest. The hydrothermal alteration is identified on the basis of newly formed sericites, which appear as pseudomorphs after feldspar and filling of pore spaces. According to K-Ar dating of sericite, serititization occurred about 145 Ma ago (Jurassic). On the basis of d 18 O analyses of sericite, sericite composition and vitrinite reflectance, the hydrothermal fluids had temperatures of 150-210 C. Because their electrolyte content was low, these fluids are assumed to have derived from meteoric water. A second pulse of electrolyte-rich hydrothermal fluids resulted in quartz overgrowths. Fluid mobilization seems to be linked to the disintegration of Pangaea and to reactivated fault systems extending from the crystalline basement into the intramontane sediments.

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“…The mineralizations on the southern edge of the Thuringian Basin bear a number of similar features to numerous deposits and occurrences throughout post-Variscan Europe, such as deposits in France (Charef & Sheppard 1988;Munoz et al 1994Munoz et al , 2005McGaig et al 2000), Spain (Halliday and Mitchell 1984;Wickham & Taylor 1990;Canals and Cardellach 1993;Galindo et al 1994;Subías and Fernández-Nieto 1995;Johnson et al 1996;Crespo et al 2002;Piqué et al 2008), Sardinia (Muchez et al 2005;Boni et al 2009), Germany (Behr & Gerler 1987;Mertz et al 1989;Boness et al 1990;Lüders & Möller 1992;Meinel 1993;Hähnel et al 1995;Krahn & Baumann 1996;Meyer et al 2000;Zeh & Thomson 2000;Wagner & Lorenz 2002;Schwinn et al 2006;Baatartsogt et al 2007;Staude et al 2007Staude et al , 2011Wagner et al 2010), Poland (Leach et al 1996;Heijlen et al 2003;Schmidt-Mumm & Wolfgramm 2004), Slovakia (Hurai et al 2002(Hurai et al , 2008, Belgium (Slobodnik et al 1994), Hungary (Benkó et al 2014), Czech Republic (Kučera et al 2010), England …”

Section: Introductionmentioning

confidence: 85%

Fluid evolution and mineralogy of Mn-Fe-barite-fluorite mineralizations at the contact of the Thuringian Basin, Thüringer Wald and Thüringer Schiefergebirge in Germany

Majzlan¹,

Brey-Funke²,

Malz³

et al. 2016

Geologica Carpathica

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Numerous small deposits and occurrences of Mn-Fe-fluorite-barite mineralization have developed at the contact of the Thuringian Basin, Thüringer Wald and Thüringer Schiefergebirge in central Germany. The studied mineralizations comprise the assemblages siderite+ankerite-calcite-fluorite-barite and hematite-Mn oxides-calcite-barite, with the precipitation sequence in that order within each assemblage. A structural geological analysis places the origin of the barite veins between the Middle Jurassic and Early Cretaceous. Primary fluid inclusions contain water vapour and an aqueous phase with NaCl and CaCl 2 as the main solutes, with salinities mostly between 24-27 mass. % CaCl 2 eq. T h measurements range between 85 °C and 160 °C in barite, between 139 °C and 163 °C in siderite, and between 80 °C and 130 °C in fluorite and calcite. Stable isotopes (S, O) point to the evaporitic source of sulphur in the observed mineralizations. The S,C,O isotopic compositions suggest that barite and calcite could not have precipitated from the same fluid. The isotopic composition of the fluid that precipitated barite is close to the sea water in the entire PermoMesozoic time span whereas calcite is isotopically distinctly heavier, as if the fluids were affected by evaporation. The fluid evolution in the siliciclastic/volcanic Rotliegend sediments (as determined by a number of earlier petrological and geochemical studies) can be correlated with the deposition sequence of the ore minerals. In particular, the bleaching of the sediments by reduced Rotliegend fluids (basinal brines) could be the event that mobilized Fe and Mn. These elements were deposited as siderite+ankerite within the Zechstein carbonate rocks and as hematite+Mn oxides within the oxidizing environment of the Permian volcanic and volcanoclastic rocks. A Middle-Jurassic illitization event delivered Ca, Na, Ba, and Pb from the feldspars into the basinal brines. Of these elements, Ba was deposited as massive barite veins.

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Further evidence for a Jurassic mineralizing event in central Europe: K-Ar dating of hydrothermal alteration and fluid inclusion systematics in wall rocks of the Käfersteige fluorite vein deposit in the northern Black Forest, Germany

Cited by 39 publications

References 0 publications

Geology, Fluid Inclusions, and Geochemistry of the Aouli Sulphide ± Fluorite ± Barite Vein Deposit (Upper Moulouya District, Morocco) and Its Relationships to Pangean Rifting and Opening of the Tethys and Central Atlantic Oceans

Geology, Fluid Inclusions, and Geochemistry of the Aouli Sulphide ± Fluorite ± Barite Vein Deposit (Upper Moulouya District, Morocco) and Its Relationships to Pangean Rifting and Opening of the Tethys and Central Atlantic Oceans

Authigenic sericite record of a fossil geothermal system: the Offenburg trough, central Black Forest, Germany

Fluid evolution and mineralogy of Mn-Fe-barite-fluorite mineralizations at the contact of the Thuringian Basin, Thüringer Wald and Thüringer Schiefergebirge in Germany

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