Metamorphic evolution of the pre-Hercynian basement of the Schwarzwald (Federal Republic of Germany)

Stenger, R; Baatz, K; Klein, Hans; Wimmenauer, Wolfhard

doi:10.1016/0040-1951(89)90345-4

Cited by 12 publications

(2 citation statements)

References 10 publications

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“…Numerous small intercalations of eclogites and granulite facies gneisses are indicative of high‐ P and medium‐ P events. The entire Central Gneiss Complex was overprinted by a late low‐ P , high‐ T metamorphism ( Wimmenauer, 1986; Stenger et al ., 1989 ). Migmatization in the monotonous gneisses is widespread and is related to the last metamorphic overprint ( Flöttmann & Kleinschmidt, 1989).…”

Section: Geological Settingmentioning

confidence: 99%

Quantitative temperature‐time information from retrograde diffusion zoning in garnet: constraints for the P–T–t history of the Central Black Forest, Germany

Weyer¹,

Jarick²,

Mezger³

1999

Journal Metamorphic Geology

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Garnet from a kinzigite, a high-grade gneiss from the central Black Forest (Germany), displays a prominent and regular retrograde diffusion zoning in Fe, Mn and particularly Mg. The Mg diffusion profiles are suitable to derive cooling rates using recent datasets for cation diffusion in garnet. This information, together with textural relationships, thermobarometry and thermochronology, is used to constrain the pressure-temperature-time history of the high-grade gneisses. The garnet-biotite thermometer indicates peak metamorphic temperatures for the garnet cores of 730-810°C. The temperatures for the outer rims are 600-650°C. Garnet-Al 2SiO 5 -plagioclase-quartz (GASP) barometry, garnet-rutile-Al 2SiO 5 -ilmenite (GRAIL) and garnet-rutile-ilmenite-plagioclase-quartz (GRIPS) barometry yield pressures from 6-9 kbar. U-Pb ages of monazite of 341±2 Ma date the low-P high-T metamorphism in the central Black Forest. A Rb/Sr biotite-whole rock pair defines a cooling age of 321±2 Ma. The two mineral ages yield a cooling rate of about 15±2°C Ma−1. The petrologic cooling rates, with particular consideration of the fO 2 conditions for modelling retrograde diffusion profiles, agree with the geochronological cooling rate. The oldest sediments overlying the crystalline basement indicate a minimum cooling rate of 10°C Ma−1.

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Section: Geological Settingmentioning

confidence: 99%

Quantitative temperature‐time information from retrograde diffusion zoning in garnet: constraints for the P–T–t history of the Central Black Forest, Germany

Weyer¹,

Jarick²,

Mezger³

1999

Journal Metamorphic Geology

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“…The CSGC and the SSGC are both considered as part of the Moldanubian Zone, but they appear to represent different crustal blocks. The lithological difference of these blocks was already emphasised by Wimmenauer (1984), Lüschen et al (1987), Müller (1989), Stenger et al (1989) and Kalt Fig. 1 Geological sketch map of the southern Schwarzwald (modified after Hann and Sawatzki 2000) with a schematic geological cross section through the southern Schwarzwald from Todtnau to Fetzenbach.…”

Section: Introductionmentioning

confidence: 97%

The Rand Granite in the southern Schwarzwald and its geodynamic significance in the Variscan belt of SW Germany

Hann

Chen

Zedler

et al. 2003

International Journal of Earth Sciences

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The Rand Granite is a heterogeneous metamorphosed granitoid rock complex with numerous wallrock inclusions situated in the Moldanubian Zone at the southern margin of the Central Schwarzwald Gneiss Complex. It is a largely mylonitized elongated body and is thrust over the Badenweiler-Lenzkirch Zone forming a nappe with shear zones along its northern and southern boundaries. It comprises meta-granites, meta-trondhjemites and biotite augen gneisses derived from monzogranites to granodiorites. Mineral behaviour indicates that the magmatic body has been deformed under upper greenschist facies conditions. Nappe thrusting, which also affected the South Schwarzwald Gneiss Complex, occurred in Visean time during high-temperature / lowpressure metamorphism. Kinematic indicators in the mylonites document E-to ESE-directed nappe transport, highly transpressive relative to the trend of the nappe boundaries and the foliation. The trondhjemites formed at 351 +5/-4 Ma, predating the Variscan HT metamorphism. They have initial e Nd -values of +6.6 to +6.7 and relatively low initial 87 Sr/ 86 Sr ratios (0.7042 to 0.7063), indicating a predominant mantle origin. The granites and protoliths of the biotite augen gneisses probably crystallised between 436 and 377 Ma, suggested by U-Pb zircon model ages. They are different from the trondhjemites with low initial e Nd -values (4.7 to 3.3) and higher initial 87 Sr/ 86 Sr ratios (0.7068-0.7077), indicating that large part of the Rand Granite originated from anatexis of continental crust. Internal structure of zircons from the Rand Granite reveals mixing of magmas derived from both mantle and crust sources. These new data support an interpretation that the Rand Granite developed along an active continental margin and therefore represents a possible root of a Variscan magmatic arc.

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

Hanel¹,

Lippolt

Kober

et al. 1993

Naturwissenschaften

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Metamorphic evolution of the pre-Hercynian basement of the Schwarzwald (Federal Republic of Germany)

Cited by 12 publications

References 10 publications

Quantitative temperature‐time information from retrograde diffusion zoning in garnet: constraints for the P–T–t history of the Central Black Forest, Germany

Quantitative temperature‐time information from retrograde diffusion zoning in garnet: constraints for the P–T–t history of the Central Black Forest, Germany

The Rand Granite in the southern Schwarzwald and its geodynamic significance in the Variscan belt of SW Germany

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

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