Late-Collisional Granites in the Variscan Erzgebirge, Germany

Förster, Hans‐Jürgen; Tischendorf, G.; Trumbull, Robert B.; Gottesmann, B.

doi:10.1093/petroj/40.11.1613

Cited by 234 publications

(56 citation statements)

References 49 publications

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“…As shown by numerous workers, highly-evolved, Sn-specialized granites typically exhibit these enrichments and depletions, along with elevated abundances of F, Li, Nb, and Ta (Olade 1980;Chatterjee and Muecke 1982;Edén 1991;Förster et al 1999). . .…”

Section: Economic Potentialmentioning

confidence: 84%

Geochronology and lithogeochemistry of granitoid rocks from the central part of the Central plutonic belt, New Brunswick, Canada: implications for Sn-W-Mo exploration

Wilson

Kamo

2016

atgeol

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The central part of the Central plutonic belt in New Brunswick is underlain by numerous plutons of calc-alkaline, foliated and unfoliated granite that intrude Cambrian to Early Ordovician metasedimentary rocks. U-Pb (zircon) dating demonstrates that granites range in age from Middle Ordovician to Late Devonian, although most are late Silurian to Early Devonian. An age of 467 ± 7 Ma has been obtained on the foliated McKiel Lake Granite, whereas unfoliated intrusions yield ages of 423.2 ± 3.2 Ma (Bogan Brook Granodiorite), 420.7 +1.8/-2.0 Ma (Nashwaak Granite), 419.0 ± 0.5 Ma (Redstone Mountain Granite), 416.1 ± 0.5 Ma (Beadle Mountain Granite), 415.8 ± 0.3 Ma (Juniper Barren Granite), 409.7 ± 0.5 Ma (Lost Lake Granite), and 380.6 ± 0.3 Ma (Burnthill Granite). All plutons exhibit mixed arc-like and within-plate geochemical signatures, although the Redstone Mountain and Burnthill granites are dominantly of within-plate type. Trace element data reveal a close overall geochemical similarity between Ordovician and Silurian – Devonian plutons, indicating that all were generated by partial melting of the same crustal source. Late Silurian to Early Devonian plutons mainly comprise biotite and/or muscovite-bearing, peraluminous granite and are considered prospective for granophile-element mineralization. All plutons contain Sn well in excess of the granite global average abundance, and several contain average tin values comparable to productive stanniferous granites elsewhere. The Burnthill, Lost Lake, Beadle Mountain, and Nashwaak granites are geochemically most evolved and enriched in Sn and W. The Burnthill Granite in particular has experienced late-stage hydrothermal processes that have resulted in local enrichments of these elements.

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Section: Economic Potentialmentioning

confidence: 84%

Geochronology and lithogeochemistry of granitoid rocks from the central part of the Central plutonic belt, New Brunswick, Canada: implications for Sn-W-Mo exploration

Wilson

Kamo

2016

atgeol

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“…The Nejdek or Nejdek-Eibenstock pluton (hereafter, NEP) in the western part of the Krušné Hory Mountains (Erzgebirge in German) is a typical example of Variscan orebearing magmatism in this region (Breiter et al 1991Förster et al 1999). Granites of the older intrusive complex (hereafter, designated as NEP1) are predominantly coarsegrained oligoclase-biotite granites without any evidence of geochemical specialization.…”

Section: Studied Granitesmentioning

confidence: 99%

Monazite and zircon as major carriers of Th, U, and Y in peraluminous granites: examples from the Bohemian Massif

Breiter

2016

Miner Petrol

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The chemical compositions of zircon and monazite and the relationships between the contents of Th, U, Y, and REE in both minerals and in the bulk samples of their parental rocks were studied in three Variscan composite peraluminous granite plutons in the Bohemian Massif. It was established that granites of similar bulk composition contain zircon and monazite of significantly different chemistry. Monazite typically contains 5-13 wt% (rarely up to 28 wt%) ThO 2 , 0.4-2 wt% (up to 8.2 wt%) UO 2 , and 0.5-2 wt% (up to 5 wt%) Y 2 O 3 , whereas zircon typically contains less than 0.1 wt% (rarely up to 1.7 wt%) ThO 2 , less than 1 wt% UO 2 (in the Plechý/Plockenstein granite, commonly, 1-2 wt% and scarcely up to 4.8 wt% UO 2 ), and less than 1 wt% Y 2 O 3 (in the Nejdek pluton often 2-5, maximally 7 wt% Y 2 O 3 ). Monazite is an essential carrier of thorium, hosting more than 80 % of Th in all studied granites. Monazite also appears to be an important carrier of Y (typically 14-16 %, and in the Melechov pluton, up to 81 % of the total rock content) and U (typically 18-35 % and occasionally 6-60 % of the total rock budget). The importance of zircon for the rock budget of all the investigated elements in granites is lower: 4-26 % U, 5-17 % Y, and less than 5 % Th.

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“…Granite porphyry dykes of the Regensburg Forest (322-324 Ma, Siebel et al 2006) and late-collisional Erzgebirge granites (325-318 Ma, Förster et al 1999) are suggested to be intrusions in a large-scale extensional regime as well. In the South Armorican Domain (Western France) massive plutonic bodies and dykes intruded in an extensional WNW-ESE regional stretching regime (319 ± 6 Ma, Turrillot et al 2011), while in the French Massif Central and the eastern part of the Vosges an extensional setting with NW-SE-oriented stretching directions are documented (Burg et al 1994;Cagnard et al 2003;Faure 1995).…”

Section: Regional Tectonics Of the Late-variscan Extensional Settingmentioning

confidence: 99%

“…late-Variscan intrusions in the Regensburg Forest, NE Bavaria, (Stallwang granodiorites, granite porphyry dykes) are oriented oblique to the pronounced NW-SE trending Bavarian Pfahl shear zone and give concordant 207 Pb/ 206 Pb zircon evaporation ages of 322-324 Ma (Siebel et al 2006). The late-collisional Erzgebirge granites were emplaced at shallow crustal levels into the Variscan metamorphic basement shortly after large-scale extension caused by orogenic collapse (Förster et al 1999). Similarly, in the Strudengau area (SW Moldanubia, Austria), geochronology of a peraluminous dyke intruded in a NW-SE-oriented extensional regime indicates intrusion at 323 ± 5.7 (Sm-Nd), with a cooling age of 318 ± 1.1 (Ar-Ar on muscovite) (Zeitlhofer et al 2013).…”

Section: Introductionmentioning

confidence: 99%

Variscan potassic dyke magmatism of durbachitic affinity at the southern end of the Bohemian Massif (Lower Austria)

Zeitlhofer

Grasemann

Petrakakis

2015

Int J Earth Sci (Geol Rundsch)

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an Rb-Sr age of c. 318 Ma, interpreted as a deformation age during extensional tectonics. We propose a large-scale extensional regime at c. 320 Ma in the Strudengau area, accompanied by plutonism of fractionated magmas of syncollisional mantle-derived sources, mixed with crustal components. This geodynamic setting is comparable to other areas in the Variscan belt documenting an orogenic wide extension by the end of the Carboniferous.

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Late-Collisional Granites in the Variscan Erzgebirge, Germany

Cited by 234 publications

References 49 publications

Geochronology and lithogeochemistry of granitoid rocks from the central part of the Central plutonic belt, New Brunswick, Canada: implications for Sn-W-Mo exploration

Geochronology and lithogeochemistry of granitoid rocks from the central part of the Central plutonic belt, New Brunswick, Canada: implications for Sn-W-Mo exploration

Monazite and zircon as major carriers of Th, U, and Y in peraluminous granites: examples from the Bohemian Massif

Variscan potassic dyke magmatism of durbachitic affinity at the southern end of the Bohemian Massif (Lower Austria)

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