Pb/Pb and U/Pb zircon dating of subvolcanic rhyolite as a time marker for Hercynian granite magmatism and Sn mineralisation in the Eibenstock granite, Erzgebirge, Germany: Considering effects of zircon alteration

Kempe, Ulf; Bombach, Klaus; Matukov, D. I.; Schlothauer, T.; Hutschenreuter, Jan; Wolf, D.; Сергеев, С. А.

doi:10.1007/s00126-004-0435-y

Cited by 48 publications

(29 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Schmädicke et al 1995;Kröner and Willner 1998;Werner and Lippolt 2000;Tichomirowa et al 2005). Amphibolite facies rocks yielded Rb/Sr and Ar/Ar metamorphic cooling ages of about 330 Ma (Tikhomirova et al 1995;Werner and Lippolt 2000) which overlap with the intrusion ages determined for early post-metamorphic granites and rhyolites of about 330 Ma (Tichomirowa 1997;Kempe et al 1999Kempe et al , 2004Kempe 2003;Romer et al 2007;Förster and Romer 2010;Tichomirowa and Leonhardt 2010).…”

Section: Previous Geochronologymentioning

confidence: 90%

Inferring protoliths of high-grade metamorphic gneisses of the Erzgebirge using zirconology, geochemistry and comparison with lower-grade rocks from Lusatia (Saxothuringia, Germany)

Tichomirowa

Сергеев

Berger

et al. 2012

Contrib Mineral Petrol

View full text Add to dashboard Cite

Protoliths of highly metamorphosed gneisses from the Erzgebirge are deduced from the morphology, age and chemistry of zircons as well as from whole rock geochemistry and are compared with lower-grade rocks of Lusatia. Gneisses with similar structural appearance and/or geochemical pattern may have quite different protoliths. The oldest rocks in the Erzgebirge are paragneisses representing meta-greywackes and meta-conglomerates. The youngest group of zircon of meta-greywackes that did not undergo Pb loss represents the youngest igneous component for source rocks (about 575 Ma). Similar ages and zircon morphology reflect the subordinate formation of new zircon grains or only zircon rims in the augengneiss from Bärenstein and Wolkenstein, which probably represent metamorphic equivalents to Lower Cambrian twomica granodiorites from Lusatia. Bulk rock chemistry, intense fracturing and high U and Th concentrations of zircons suggest deformation-induced and fluid-enhanced recrystallisation of zircon grains. Temperatures during tectonic overprinting-too low to reset zircon ages-indicate mid-or upper crustal levels for shearing recorded in these augengneisses. Lower Cambrian (*540 Ma) granodiorites are widespread in Lusatia but are exclusively represented by the Freiberg gneiss dome in the Eastern Erzgebirge. Ordovician protolith ages were recorded by zircons from the augengneisses of the Reitzenhain-Catherine dome and the Schwarzenberg dome (Western Erzgebirge) documenting significant regional differences between the eastern and the western Erzgebirge (*540 vs. *490 Ma). In the Western Erzgebirge, most meta-volcanic rocks (muscovite gneisses) and meta-granites (mainly red augengneisses) yield Ordovician zircon ages, whereas in the Eastern part, similar rocks mainly recorded Lower Cambrian protolith ages. Zircon overprinting was highest within discrete tectonic zones where the combination of fluid infiltration and deformation induced variable degrees of recrystallisation and formation of a new augengneiss structure. Variable degrees of Pb loss caused age shifts that do not correspond to changes in zircon morphology but may be associated with U and Th enrichments. Major changes in bulk rock composition appear to be restricted to discrete zones and to (U)HP nappes, whereas gneisses with a MP-MT metamorphic overprint basically show no geochemical modifications.

show abstract

Section: Previous Geochronologymentioning

confidence: 90%

Inferring protoliths of high-grade metamorphic gneisses of the Erzgebirge using zirconology, geochemistry and comparison with lower-grade rocks from Lusatia (Saxothuringia, Germany)

Tichomirowa

Сергеев

Berger

et al. 2012

Contrib Mineral Petrol

View full text Add to dashboard Cite

show abstract

“…The YIC granites have zircon ages between 323 and 318 Ma (Förster et al 1999;Kempe et al 2004;Romer et al 2007) as documented in the northern part of the intrusion. Dioritic intrusions in the southern NejdekEibenstock massif and redwitzites in NE Bavaria show zircon ages between 325 and 323 Ma (Taubald 2000;Siebel et al 2003;Kováříková et al 2007) and belong thus to the first cycle of Variscan granitoid magmatism in the Krušné hory/Erzgebirge (Siebel et al 1997).…”

Section: Geological Settingmentioning

confidence: 95%

“…Holl et al 1989). Geochronological measurements show that dioritic rocks in NW Bohemia and redwitzites in the northern Oberpfalz were formed at about 325 Ma (Siebel et al 2003, Kováříková et al 2005 coeval with the emplacement of late Variscan granites of the Krušné hory/Erzgebirge batholith (Kempe et al 2004;Romer et al 2007). Fiala (1968) noticed a compositional similarity between mafic intrusions in the Slavkovský les and redwitzites in NE Bavaria, but he used the name ''redwitzite'' only for the mafic rocks with a planar texture.…”

Section: Introductionmentioning

confidence: 94%

Dioritic intrusions of the Slavkovský les (Kaiserwald), Western Bohemia: their origin and significance in late Variscan granitoid magmatism

Kováříková

Siebel

Jelínek

et al. 2009

Int J Earth Sci (Geol Rundsch)

View full text Add to dashboard Cite

Mafic and intermediate intrusions occur in theSlavkovský les as dykes, sills and minor tabular bodies emplaced in metamorphic rocks or enclosed in late Variscan granites near the SW contact of the Western Krušné hory/ Erzgebirge granite pluton. They are similar in composition and textures to the redwitzites defined in NE Bavaria. Single zircon Pb-evaporation analyses constrain the age of a quartz monzodiorite at 323.4 ± 4.4 Ma and of a granodiorite at 326.1 ± 5.6 Ma. The P-T range of magma crystallization is estimated at *1.4-2.2 kbar and *730-870°C and it accords with a shallow intrusion level of late Variscan granites but provides lower crystallization temperatures compared to the Bavarian redwitzites. We explain the heterogeneous composition of dioritic intrusions in the Slavkovský les by mixing between mafic and felsic magmas with a minor effect of fractional crystallization. Increased K, Ba, Rb, Sr and REE contents compared to tholeiitic basalts suggest that the parental mafic magma was probably produced by melting of a metasomatised mantle, the melts being close to lamprophyre or alkali basalt composition. Diorites and granodiorites originated from mixed magmas derived by addition of about 25-35 and 50 vol.%, respectively, of the acid end-member (granite) to lamprophyre or alkali-basalt magma. Our data stress an important role of mafic magmas in the origin of late Variscan granitoids in NW Bohemian Massif and emphasize the effect of mantle metasomatism on the origin of K-rich mafic igneous rocks.

show abstract

“…This A-type Li-mica-bearing granite (Förster and Tischendorf 1996; shares the same A-type affinities with the Sudetic 319-314 ± 4 Ma Karkonosze and 309 ± 2 Ma Strzegom-Sobotka granite massifs, as well as bimodal trachybasalt-trachyandesite-trachydacite-rhyolite volcanic suite (Mazur et al 2007). Younger volcanic activity took place at the Carboniferous-Permian boundary, as shown by the 308 ± 1 Ma Teplice-Altenberg rhyolitic caldera (Förster et al 1995), the younger, yet undated, Zinnwald-Cínovec zinnwaldite-albite granite and the 297 ± 8 Ma rhyolite dykes within the Eibenstock Pluton (Kempe et al 2004). Later on, two eruptive episodes are documented in the Lower Rotliegend molasse of the Saxonian Sub-Erzgebirge Basin.…”

Section: The Armorican Terrane Assemblagementioning

confidence: 99%

Death of super-continents and birth of oceans heralded by discrete A-type granite igneous events: the case of the Variscan-Alpine Europe

Bonin¹

2012

J. Geosci.

View full text Add to dashboard Cite

Granitoids occupy large areas of the Variscan-Alpine Europe. The specific group of A-type granites identifies postcollisional (post-orogenic) and anorogenic geodynamic settings. Post-orogenic igneous provinces are emplaced during the very last episodes of supercontinent amalgamation. Anorogenic igneous provinces accompany continental break-up and predate the development of new oceanic basins. Though not voluminous compared with the other granite types, A-type granites substantiate critical periods of the life of supercontinents. Their ages of emplacement in the Variscan-Alpine Europe span the entire Cambrian-Triassic time interval. They are not random, however, and correspond to discrete episodes. Two major age groupings, both with a c. 60 My duration, are distinguished. The Early Cambrian-Early Ordovician period corresponds to Pannotia amalgamation, followed by its break-up and the development of the Rheic-Proto-Tethys Ocean. The Late Carboniferous-Early Triassic period corresponds to Rheic closure and Pangaea amalgamation, followed by its break-up and the development of the NeoTethys Ocean. Devonian-Early Carboniferous A-type igneous episodes, scarce in Europe but widespread in Central Asia, accompanied the development of the Palaeo-Tethys Ocean.

show abstract

Pb/Pb and U/Pb zircon dating of subvolcanic rhyolite as a time marker for Hercynian granite magmatism and Sn mineralisation in the Eibenstock granite, Erzgebirge, Germany: Considering effects of zircon alteration

Cited by 48 publications

References 46 publications

Inferring protoliths of high-grade metamorphic gneisses of the Erzgebirge using zirconology, geochemistry and comparison with lower-grade rocks from Lusatia (Saxothuringia, Germany)

Inferring protoliths of high-grade metamorphic gneisses of the Erzgebirge using zirconology, geochemistry and comparison with lower-grade rocks from Lusatia (Saxothuringia, Germany)

Dioritic intrusions of the Slavkovský les (Kaiserwald), Western Bohemia: their origin and significance in late Variscan granitoid magmatism

Death of super-continents and birth of oceans heralded by discrete A-type granite igneous events: the case of the Variscan-Alpine Europe

Contact Info

Product

Resources

About