The fossil geothermal system of the Baden-Baden trough (northern Black Forest, F.R. Germany)

Zuther, Michael; Brockamp, Olaf

doi:10.1016/0009-2541(88)90058-7

Cited by 24 publications

(12 citation statements)

References 7 publications

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“…This explains why the discovery of huge alteration zones with authigenic illite and albite in Carboniferous, Permian and Bunter sandstones in the Baden-Baden intramontane trough was quite unexpected (Zuther and Brockamp 1988). 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: 90%

“…The Black Forest is one of these regions for which there are few mineralogical studies of the Carboniferous to Lower Triassic cover rocks, whereas the crystalline basement has been extensively studied. This explains why the discovery of huge alteration zones with authigenic illite and albite in Carboniferous, Permian and Bunter sandstones in the Baden-Baden intramontane trough was quite unexpected (Zuther and Brockamp 1988). 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).…”

Section: Introductionmentioning

confidence: 95%

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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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Section: Introductionmentioning

confidence: 90%

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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“…Simon 1990;Zuther and Brockamp 1988). The Southern Black Forest batholith has significantly reduced ∂…”

Section: Geology Of the Black Forestmentioning

confidence: 99%

“…Bons et al 2014). Radiometric dating of minerals originating from hydrothermal alteration of crystalline basement rocks and Permo-Triassic cover rock successions as well as of minerals originating from fault-related, mineralised veins reveal multiple and complex postVariscan phases of pervasive and localised fluid-rock interactions (Brockamp et al 2015;Zuther and Brockamp 1988;Glodny and Grauert 2009). …”

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confidence: 99%

Criteria and geological setting for the generic geothermal underground research laboratory, GEOLAB

et al. 2016

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High flow rate injection and related hydromechanical interaction are the most important factors in reservoir development of Enhanced Geothermal Systems (EGS). GeoLaB, a new generic geothermal underground research laboratory (URL), is proposed for controlled high flow rate experiments (CHFE) to address limited comprehension of coupled processes connected to EGS reservoir flow conditions. As analogue for typical EGS development, CHFE require specific hydromechanical conditions including a connected fracture network in crystalline basement rock, sufficient hydraulic fracture transmissivities, a strike-slip to normal faulting tectonic regime, controllable hydraulic boundary conditions, and hydrothermal alteration fracture fillings that improve conditions for hydromechanical interaction. With the aim to identify most appropriate areas for future site selection, four criteria have been established based on the EGS reference site of Soultz. Two URLs in crystalline basement worldwide approximate the requirements of a new generic GeoLaB and may be used for accompanying experimentation. Besides favourable geological, hydraulic, and stress conditions, the vicinity to long-term EGS production favours the southern Black Forest as potential region for GeoLaB. Therefore, an exemplary site assessment has been carried out at "Wilhelminenstollen" in the southern Black Forest (Germany). New remote sensing, hydrochemical, and geophysical analyses as well as reactivation potential, and stress modelling were added to complement existing geological and hydrogeological information. At this site, reactivation potential analysis reveals two local maxima prone for shear reactivation as strike-slip faults. The highest lineament density is observed for the N110°E strike direction that is associated with both slip and dilation tendency maxima. Clay minerals occur in fractures and the matrix. Local, partly water-bearing fractures, when partly filled with ore minerals, were connected to veins in the tunnel using shallow geophysical methods. Hydrochemical data reveal infiltration of the tunnel water from at least 500 m above the tunnel. The results suggest a crystalline basement with a fracture network that is regionally connected and water-conducting. Hydraulic conductivity in the southern Black Forest granite is estimated to amount to about 4.5·10 −8 m s −1 at 500 m depth. The hydraulic boundary conditions exclude unknown drainage. Analyses of the influence of topography on orientation and magnitude of the maximum stress indicate a minimum overburden of about 500 m for regional reactivation to be valid. In conclusion, the southern Black Forest and in particular "Wilhelminenstollen" offers favourable condition for CHFE. Final decision on the GeoLaB site is to be drawn from forthcoming exploration wells.

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“…For example, the convective transfer of heat by hydrothermal fluids can cause transient thermal events within the upper crust. In particular, fluid circulation along fault zones can result in substantial convective heat transport and cause temperature anomalies in the adjacent rocks (Zuther & Brockamp 1988, Fleming et al 1998, Lampe & Person 2002, Bächler et al 2003. As a consequence, any refined interpretation of FT data requires a thorough understanding of the upper crustal temperature field and its evolution through time.…”

Section: Retro-deformationmentioning

confidence: 99%

11. Symposium "Tektonik, Struktur- und Kristallingeologie"

Phillipp¹,

Leiss²,

Vollbrecht³

et al. 2006

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The fossil geothermal system of the Baden-Baden trough (northern Black Forest, F.R. Germany)

Cited by 24 publications

References 7 publications

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

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

Criteria and geological setting for the generic geothermal underground research laboratory, GEOLAB

11. Symposium "Tektonik, Struktur- und Kristallingeologie"

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