Lower carboniferous granulites in the Schwarzwald basement near Hohengeroldseck (SW Germany)

Hanel, Michael; Lippolt, H. J.; Kober, Bernd; Wimmenauer, Wolfhard

doi:10.1007/bf01139753

Cited by 16 publications

(11 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This is a precise estimate of the time of zircon crystallization, triggered by the granulite-facies metamorphic event of Unit 3. It agrees with the age estimate of Hanel et al (1993) using single zircon and the Pb evaporation method. Highgrade metamorphic growth of this subpopulation is in agreement with the low Th/U ratios of the grains (0.01-0.03, Table 1) which has been reported to be a feature of granulite facies metamorphic zircons (Th/U <0.07: Rubatto 2002).…”

Section: Sample Om-3-2 (Ogc)supporting

confidence: 79%

“…Unit 3 is characterized by granulite-facies relics and rare eclogites and mantle-derived rocks, and is mainly found in the northern part of the CSGC (Fig. 1, Hanel et al 1993). Peak equilibration conditions of the granulites were approximately 950-1,000°C and 1.4-1.8 GPa, and the entire unit is interpreted as part of the lower crust of a hanging continental plate in a convergent Variscan setting (Marschall et al 2003).…”

Section: Geological Setting and Samplesmentioning

confidence: 99%

See 1 more Smart Citation

SHRIMP dating of zircons from high-grade metasediments of the Schwarzwald/SW-Germany and implications for the evolution of the Moldanubian basement

Kober

Kalt

Hanel

et al. 2004

Contributions to Mineralogy and Petrology

Self Cite

View full text Add to dashboard Cite

Four metasedimentary zircon populations from different tectonometamorphic units of the Central and the Northern Schwarzwald (Variscan belt, SWGermany) were investigated using SEM, cathodoluminescence and SHRIMP dating. Despite partially strong modifications of primary internal morphologies during Variscan metamorphism at amphibolite (750°C, 0.4-0.6 GPa) and granulite-facies conditions (950-1,000°C, 1.4-1.8 GPa), many grains show well-preserved protolith ages. The detritus indicates a northern Gondwana origin and different Palaeozoic episodes of sediment deposition and consolidation. Two of the studied sediments were deposited in Cambrian/early-Ordovician times and consolidated in positions close to northern Gondwana. Late Ordovician and rare Devonian detritus from sediments of two other tectonometamorphic units indicates much later sedimentation close to the leading edge of Gondwana or a terrane assemblage during northern drift towards Laurussia. Subsolidus growth of new zircon due to Variscan granulite facies metamorphism of one of the tectonometamorphic units is precisely dated at 335±2 Ma.

show abstract

Section: Sample Om-3-2 (Ogc)supporting

confidence: 79%

Section: Geological Setting and Samplesmentioning

confidence: 99%

SHRIMP dating of zircons from high-grade metasediments of the Schwarzwald/SW-Germany and implications for the evolution of the Moldanubian basement

Kober

Kalt

Hanel

et al. 2004

Contributions to Mineralogy and Petrology

Self Cite

View full text Add to dashboard Cite

show abstract

“…3. Gneisses with relicts of a granulite-facies metamorphic stage (Röhr 1990;Hanel et al 1993) are restricted to both sides of the lower Kinzig valley in the central part of the CSGC and also occur in the SSGC.…”

Section: Geological Setting and Sample Locationmentioning

confidence: 99%

Determining sedimentation ages of high-grade metamorphic gneisses by their palynological record: a case study in the northern Schwarzwald (Variscan Belt, Germany)

Hanel

Montenari²,

Kalt

1999

International Journal of Earth Sciences

Self Cite

View full text Add to dashboard Cite

“…Sedimentary protoliths in the three units formed between the Neoproterozoic and lower Devonian (Hanel et al, 1999;Kober et al, 2004). The ages of the HP-metamorphism in units 1 and 3 are 335À340 Ma (Hanel et al, 1993;Kalt et al, 1994a;Kober et al, 2004) subsequently followed by a LP-HT-metamorphism, which affected all three tectonometamorphic units at~330 Ma (Lippolt et al, 1994;Kalt et al, 1994bKalt et al, , 2000.…”

Section: Geological Setting and P-t-t History Of The Central Schwarzwmentioning

confidence: 99%

Fluorapatite-monazite relationships in granulite-facies metapelites, Schwarzwald, southwest Germany

Harlov¹,

Marschall²,

Hanel³

2007

Mineral. mag.

Self Cite

View full text Add to dashboard Cite

Fluorapatite grains with monazite inclusions and/or rim grains are described in two of four samples from a set of granulite-facies metapelites collected from the Variscan Schwarzwald, southern Germany. Fluorapatite in all four samples appears to have experienced some dissolution in the partial granitic melt formed during granulite-facies metamorphism. Monazite inclusions and rim grains are highly deficient in Th and are presumed to have formed from fluorapatite in association with partial melting during granulite-facies metamorphism. Monazite inclusions range from very small (<1 mm) and very numerous to small (1À2 mm), sometimes elongated, and less numerous; both types are evenly distributed throughout the fluorapatite grain interior. Monazite rim grains tend to be 1À10 mm. The formation of monazite inclusions is proposed to be due to dissolution-reprecipitation of the fluorapatite by the aqueous fluids inherent in the granitic melt. We propose that an increase in inclusion size coupled with a decrease in inclusion number is due to Ostwald ripening (interfacial energy reduction), which is greatly facilitated by the presence of an interconnected, fluid-filled porosity in the metasomatized fluorapatite. We further propose that monazite rim grains formed principally during partial dissolution of the fluorapatite in the granitic melt and to a lesser extent by partial dissolutionreprecipitation of the fluorapatite grain rim area allowing for the partial removal of (Y+REE). We conclude that fluorapatite, with monazite inclusions and rim grains, experienced partial dissolution in a H 2 O-rich peraluminous granitic melt compared to fluorapatite with monazite rim grains and no inclusions which reacted with a similar, relatively less H 2 O-rich melt. In contrast, monazite-free fluorapatite experienced partial dissolution in a comparatively H 2 O-poor, subaluminous, possibly peralkaline melt.

show abstract

Lower carboniferous granulites in the Schwarzwald basement near Hohengeroldseck (SW Germany)

Cited by 16 publications

References 18 publications

SHRIMP dating of zircons from high-grade metasediments of the Schwarzwald/SW-Germany and implications for the evolution of the Moldanubian basement

SHRIMP dating of zircons from high-grade metasediments of the Schwarzwald/SW-Germany and implications for the evolution of the Moldanubian basement

Determining sedimentation ages of high-grade metamorphic gneisses by their palynological record: a case study in the northern Schwarzwald (Variscan Belt, Germany)

Fluorapatite-monazite relationships in granulite-facies metapelites, Schwarzwald, southwest Germany

Contact Info

Product

Resources

About