The Saxo-Danubian Granite Belt: magmatic response to post-collisional delamination of mantle lithosphere below the southwestern sector of the Bohemian Massif (Variscan orogen)

Finger, Friedrich; Gerdes, Axel; René, Miloš; Riegler, Gudrun

doi:10.2478/v10096-009-0014-3

Cited by 81 publications

(43 citation statements)

References 45 publications

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“…Also Siebel et al (2003) found that mantle-related magmatism in NE Bavaria postdated the final convergence stage of the Variscan orogen (see also Finger et al 2009). …”

Section: Variscan Magmatismmentioning

confidence: 99%

Mantle lithosphere control of crustal tectonics and magmatism of the western Ohře (Eger) Rift

Babuška¹,

Plomerová²

2012

J. Geosci.

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This paper summarizes our recent research on the relationship between tectonics of the mantle lithosphere and of the upper crust in the western Bohemian Massif. The rejuvenated Variscan junction of three mantle domains, the Saxothuringian, Moldanubian and Teplá-Barrandian, delimited by different orientation of seismic anisotropy reflecting a consistent fossil olivine orientation and belonging to originally separated microplates, plays important role in the crustal architecture of the region. The crust above the mantle junction is the most active part of the BM characterized by periodic earthquake swarms and mofettes emitting gases of mantle origin. Detected offsets of surface boundaries of the three units from their mantle counterparts indicate a detachment of the rigid upper crust from the mantle lithosphere. Locations of major tectonic features like the Ohře (Eger) Rift, the West Bohemian Shear Zone and the Mariánské Lázně Fault were probably predisposed by the boundaries of the mantle lithosphere domains. We have suggested that the sublithospheric mantle of the western BM acted as a major provider for heat and partial melts and the Variscan mantle boundaries served as magma conduits for the late-orogenic granitic magmatism and, after their rejuvenation, also for the Cenozoic volcanism. Similarly, the boundaries may have pre-determined the subsequent locations of sedimentary basins. It is possible that also in other regions some of these so called intra-plate phenomena can be related to partly healed up and later rejuvenated microplate boundaries.

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“…Also Siebel et al (2003) found that mantle-related magmatism in NE Bavaria postdated the final convergence stage of the Variscan orogen (see also Finger et al 2009). …”

Section: Variscan Magmatismmentioning

confidence: 99%

Mantle lithosphere control of crustal tectonics and magmatism of the western Ohře (Eger) Rift

Babuška¹,

Plomerová²

2012

J. Geosci.

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“…The batholith belongs to one coherent and cogenetic, ca. 400 km long plutonic megastructure of the Saxo-Danubian Granite Belt [14].…”

Section: Geological Settingmentioning

confidence: 99%

REE and Y Mineralogy of the Krudum Granite Body (Saxothuringian Zone)

René

2018

Minerals

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Abstract:The Krudum granite body comprises highly fractionated granitic rocks ranging from medium-F biotite granites to high-F, high-P 2 O 5 Li-mica granites. This unique assemblage is an ideal site to continue recent efforts in petrology to characterize the role of zircon, monazite, and xenotime as hosts to rare earth elements (REEs). The granitic rocks of the Krudum body analyzed in this study were found to contain variable concentrations of monazite and zircon, while xenotime was only found in the high-F, high-P 2 O 5 Li-mica granites and in the alkali-feldspar syenites of the Vysoký Kámen stock. Intermediate trends between cheralite and huttonite substitutions are characteristic for analyzed monazite grains from all magmatic suites. The highest concentration of cheralite was found in monazite from the alkali-feldspar syenites (up to 69.3 mol %). The proportion of YPO 4 in analyzed xenotime grains ranges from 71 to 84 mol %. Xenotime grains are commonly enriched in heavy rare earth elements (HREEs; 9.3-19.5 wt % HREE 2 O 3 ) and thorite-coffinite and cheralite exchange was observed. Some xenotime analyses return low totals, suggesting their hydration during post-magmatic alterations. Analyzed zircon from granite suites of the Krudum granite body contains moderate Hf concentrations (1.0-4.7 wt % HfO 2 ; 0.010-0.047 apfu Hf). The highest concentrations of HfO 2 were found in zircon from the high-F, high-P 2 O 5 Li-mica granites (1.2-4.7 wt % HfO 2 ). Analyzed zircon grains from the high-F, high-P 2 O 5 Li-mica granites and alkali-feldspar syenites are enriched in P (up to 8.29 wt % P 2 O 5 ; 0.24 apfu P), Al (0.02-2.0 wt % Al 2 O 3 ; 0.00-0.08 apfu Al), Ca (up to 3.9 wt % CaO; 0.14 apfu Ca), Y (up to 5.5 wt % Y 2 O 3 ; 0.10 apfu Y), and Sc (up to 1.17 wt % Sc 2 O 3 ; 0.03 apfu Sc). Zircon grains from the high-F, high-P 2 O 5 Li-mica granites were sometimes hydrated and fluorized. The concentrations of F in zircon from partly greisenised high-F, high-P 2 O 5 Li-mica granites reached up to 1.2 wt % (0.26 apfu F).

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“…Partial melting of metapelites produced biotite granites-granodiorites of the Weinsberg suite (331-323 Ma), S-type two-mica granites of the Eisgarn suite (329-324 Ma), and fine-to medium-grained I/S-type biotite granites-granodiorites of the Freistadt/Mauthausen suite . The Rastenberg and Knížecí Stolec plutons (337)(338)(339)(340) are part of the durbachitic granites belt; also different diorites form small isolated bodies (323-327 Ma) within the Moldanubian Batholith (e.g., Gebharts diorites) (Frasl and Finger 1988;Liew et al 1989;Vellmer and Wedepohl 1994;Klötzli and Parrish 1996;Finger et al 1997Finger et al , 2009Gerdes et al 2000Gerdes et al , 2003Siebel et al 2008;Žák et al 2011;Verner et al 2008Verner et al , 2014.…”

Section: Introductionmentioning

confidence: 99%

“…One of the classic examples is the Variscan Belt in Europe, produced as a result of the late Palaeozoic convergence of Gondwana and Laurussia. The Moldanubian Batholith (MB) that forms one of the largest plutonic complexes within the European Variscan Belt, covering 10 000 km 2 in the central and western parts of the Moldanubian Zone of Bohemian Massif (an easterly exposure of the European Variscan Belt), provides an excellent insight into the origin and emplacement of such crustally derived magmas (e.g., Liew et al 1989;Holub et al 1995;Gerdes et al 2000;Finger et al 2009;Verner et al 2014).…”

Section: Introductionmentioning

confidence: 99%

Source compositions and melting temperatures of the main granitic suites from the Moldanubian Batholith

René¹

2016

J. Geosci.

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The granitoids of the Moldanubian Batholith (Moldanubian Zone of the Bohemian Massif) are represented by three main suites: I-to I/S-type Weinsberg biotite granites-granodiorites, S-type Eisgarn two-mica granites and I/S-type Freistadt biotite granites-granodiorites. As shown by major-element data and zircon with monazite saturation thermometry, partial melting of metapelites likely produced most of the Eisgarn suite (Mrákotín/Číměř varieties) at c. 775-825 ºC. Parental melts of the Weinsberg and Freistadt suites could have been generated by partial melting of a metagreywackes-metabasalts mixture at c. 740-940 ºC. This study confirms that the CaO/Na 2 O ratio could be used for source assignment of S-type granite melts, whereas the CaO/(FeO + MgO + TiO 2 ) ratio is more suitable for I/S-type granites. The observed systematic positive shift of Al 2 O 3 / TiO 2 temperatures compared with zircon and monazite saturation temperatures in all granitoids of the Moldanubian Batholith (up to 118 ºC) may be explained by accumulation of ilmenite in the S-type Eisgarn suite. In the I-and I/S--granite types of the Weinsberg and Freistadt suites the Al 2 O 3 /TiO 2 ratio is controlled by the accumulation of ilmenite and/or titanite. Consequently, the Al 2 O 3 /TiO 2 ratio may be used as a thermometer only with caution. : granites, petrology, geochemistry, Moldanubian Zone, Bohemian Massif Received: 12 April, 2016; accepted: 3 January, 2017; handling editor: J. Žák The online version of this article (doi: 10.3190/jgeosci.223) contains supplementary electronic material. Keywordsthe majority of the Eisgarn suite at temperatures ranging from 770 to 830 ºC. Melts of the Weinsberg and Freistadt suites were generated by partial melting of a mixture of metagreywackes and metabasalts at temperatures in the range of 740-940 ºC.

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The Saxo-Danubian Granite Belt: magmatic response to post-collisional delamination of mantle lithosphere below the southwestern sector of the Bohemian Massif (Variscan orogen)

Cited by 81 publications

References 45 publications

Mantle lithosphere control of crustal tectonics and magmatism of the western Ohře (Eger) Rift

Mantle lithosphere control of crustal tectonics and magmatism of the western Ohře (Eger) Rift

REE and Y Mineralogy of the Krudum Granite Body (Saxothuringian Zone)

Source compositions and melting temperatures of the main granitic suites from the Moldanubian Batholith

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