Superposition of burial and hydrothermal events: post‐Variscan thermal evolution of the Erzgebirge, Germany

Wolff, Reinhard; Dunkl, İstván; Lange, Jan‐Michael; Tonk, Christian; Voigt, Thomas; Eynatten, Hilmar von

doi:10.1111/ter.12159

Cited by 22 publications

(39 citation statements)

References 32 publications

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“…A later Tertiary overprint is not recognized by the FHe method. This result is consistent with observations from apatite (U-Th)/He data (Wolff et al, 2015).…”

Section: Geological Meaning Of Fluorite (U-th-sm)/he Agessupporting

confidence: 93%

“…For instance, according to their apatite fission track data Lange et al (2008) favored less than 1 km for late Cenozoic denudation. The minor Cenozoic denudation is also supported by the apatite (U-Th)/He thermochronological data of Wolff et al (2015).…”

Section: Introductionmentioning

confidence: 66%

“…The range of the defined median FHe ages corresponds well with the apatite (U-Th-Sm)/He (AHe) ages from the same ore districts (Figs. 2b, c, 8;Wolff et al, 2015). In the central block of the Erzgebirge, between the Gera-Jachymov and Flöha faults, as well as in the Zinnwald district, the apparent FHe ages and the apparent AHe ages are largely similar.…”

Section: Relationships To Other Well-established Thermochronometersmentioning

confidence: 89%

“…Thermal modeling reveals a Permo-Mesozoic burial temperature reaching ca. 80° to 100°C at the south, while the sedimentary cover thins out toward the north (Wolff et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

“…The Erzgebirge is an ideal test area because it hosts numerous well-studied ore deposits of variable types often containing fluorite (e.g., . Moreover, the complex post-Variscan thermal history of the Erzgebirge is extensively studied by K-Ar and Ar-Ar studies on mica and hornblende (Werner and Lippolt, 2000), apatite fission track analysis (Ventura and Lisker, 2003;Lange et al, 2008), as well as zircon and apatite (U-Th-Sm)/He thermochronology (Wolff et al, 2015). These studies suggest a significant Mesozoic sedimentary burial after the post-Variscan denundation and before the Variscan basement has been reexhumed in the Late Cretaceous (Voigt, 2009).…”

Section: Introductionmentioning

confidence: 99%

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The Age of the Latest Thermal Overprint of Tin and Polymetallic Deposits in the Erzgebirge, Germany: Constraints from Fluorite (U-Th-Sm)/He Thermochronology

et al. 2015

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The Erzgebirge region of Germany records two major episodes of hydrothermal activity, which includes a Late Carboniferous to Early Permian event associated with significant Sn-W mineralization that is related to late Variscan granite magmatism, and a Mesozoic episode of polymetallic vein mineralization. In contrast to the first event, the age of the younger hydrothermal activity is poorly constrained. For the latter, various geochronological methods yielded a wide age range from Permian to early Tertiary. Here we apply fluorite (U-Th-Sm)/He thermochronology (FHe) on both types of mineralization with a twofold goal: (1) to investigate the sensitivity and applicability of the new FHe method (Evans et al., 2005), and (2) to constrain the thermal history of ore deposits in the Erzgebirge region. Two hundred and thirty-three aliquots from seven mineralization localities have been dated. Fluorite from six deposits yielded Cretaceous FHe ages between 112 to 79 Ma, which are independent of their paragenesis. In contrast, fluorite from the Sadisdorf Sn-W deposit yielded an age of 234 Ma. The younger ages are interpreted as cooling ages indicating the time of the last thermal overprint, including possible hydrothermal activity, in the Erzgebirge. The oldest, Triassic FHe ages at Sadisdorf indicate that the Mesozoic thermal overprint only partially reset the (U-Th-Sm)/He system of the late Variscan mineralization. Thermal modeling based on FHe ages and He diffusion parameters in fluorite results in thermal histories comparable to the results from the well-established apatite-based thermal modeling. This study emphasizes the applicability of fluorite (U-Th-Sm)/He thermochronology, which is especially suited for ore deposits where apatite is lacking. Regional Geology and Post-Variscan Tectonic Evolution The Erzgebirge forms an antiform structure exposing high-to medium-grade metamorphic gneisses in the core surrounded by a sequence of low-grade metamorphic units, mainly composed of micaschists and phyllites. This metamorphic assemblage formed by crustal stacking during the Carboniferous (e.g., Werner and Lippolt, 2000) and was later intruded by late-to post-Variscan granitoids and locally covered by rhyolites (Kossmat, 1925; Romer et al., 2007; see Fig. 1b). The Erzgebirge is bordered in the east by the Lausitz thrust to the Cadomian basement of the Lausitz block (Linnemann and Romer, 2002). This fault is sealed by Cretaceous deposits that formed at the margin of the synsedimentary uplifting block in the east. The initially flexural margin was later transformed into a thrust (Linnemann and Romer, 2010). The Eger fault delimits the Erzgebirge toward the south (e.g., Kroner et al., 2007; Fig. 1b). The post-Variscan

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“…A later Tertiary overprint is not recognized by the FHe method. This result is consistent with observations from apatite (U-Th)/He data (Wolff et al, 2015).…”

Section: Geological Meaning Of Fluorite (U-th-sm)/he Agessupporting

confidence: 93%

Section: Introductionmentioning

confidence: 66%

Section: Relationships To Other Well-established Thermochronometersmentioning

confidence: 89%

“…Thermal modeling reveals a Permo-Mesozoic burial temperature reaching ca. 80° to 100°C at the south, while the sedimentary cover thins out toward the north (Wolff et al, 2015).…”

Section: Introductionmentioning

confidence: 99%