Tectonic evolution of a continental magmatic arc from transpression in the upper crust to exhumation of mid-crustal orogenic root recorded by episodically emplaced plutons: the Central Bohemian Plutonic Complex (Bohemian Massif)

Žák, Jiří; Holub, František V.; Verner, Kryštof

doi:10.1007/s00531-005-0482-3

Cited by 87 publications

(44 citation statements)

References 20 publications

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“…They exhibit high ∑Y + REE contents (191-447 ppm) with enrichment in LREE (La N /Yb N =12-30) and weak negative Eu anomalies (Eu/Eu* ~ 0.7). The geochemical signature as well as Sr isotopic ratios ( 87 Sr/ 86 Sr 337 = 0.7090-0.7125) and Nd isotopic data (ε 3 N 3 d 7 = -6.3) suggest mixing of durbachitic (enriched mantle-derived) magma with leucogranitic anatectic melt (Holub 1997;Janoušek et al 2000Janoušek et al , 2003Žák et al 2005). The durbachite suite intruded shortly after exhumation of the high-grade Gföhl Unit to mid-crustal levels at ~ 340-335 Ma (Holub…”

Section: Geology Of the Třebíč Plutonmentioning

confidence: 99%

Distributions of Y + REE and Sc in tourmaline and their implications for the melt evolution; examples from NYF pegmatites of the Třebíč Pluton, Moldanubian Zone, Czech Republic

Čopjaková¹,

Škoda²,

Galiová³

et al. 2013

J. Geosci.

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Tourmalines from NYF and mixed (NYF + LCT) pegmatites of the Třebíč Pluton (Moldanubian Zone, Czech Republic) are generally characterized by variable and relatively high concentrations of Y + REE (4-457 ppm) and Sc (18-765 ppm). They show enrichment in LREE (Ce > La); the chondrite-normalized REE patterns decrease uniformly from La to Tb; Tb to Tm are mostly below the detection limits (< 0.01-0.08 ppm) and are followed by an upturn to Yb and Lu. Our textural and paragenetic observations indicate that growth of magmatic tourmaline reflects Y + REE contents in the melt. Tourmaline is highly compatible with Sc and shows exceptionally high contents of Sc compared to the analyzed host pegmatite units (less than 1 ppm Sc). The contents of Sc positively correlate with ∑Y + REE. Two distinct evolutionary trends of trace-elements in tourmaline were distinguished. (i) A conspicuous increase in Y + REE and Sc in tourmaline (dravite, Ca-rich dravite) from primitive euxenite-type pegmatites reflects their enrichment in the melt with the progressive crystallization and fractionation. It also was enhanced by low P (< 0.02 wt. % P 2 O 5 ) and Ca contents (< 0.8 wt. % CaO) in host pegmatite unit preventing precipitation of Y + REE phosphates and allanite, respectively.(ii) Tourmaline (schorl, fluor-schorl, fluor-elbaite) from more evolved pegmatites (evolved euxenite-type and mixed (NYF + LCT) pegmatite) show a depletion in REE and Sc with progressive crystallization reflecting most likely the coeval precipitation of REE-rich minerals, especially monazite-(Ce), xenotime-(Y), samarskite-and aeschynite-group minerals. The Eu anomalies in tourmaline vary significantly from positive (up to Eu/Eu* ~ 16) to substantially negative ones and are related to the Eu contents in the melt and degree of its fractionation.

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Section: Geology Of the Třebíč Plutonmentioning

confidence: 99%

Distributions of Y + REE and Sc in tourmaline and their implications for the melt evolution; examples from NYF pegmatites of the Třebíč Pluton, Moldanubian Zone, Czech Republic

Čopjaková¹,

Škoda²,

Galiová³

et al. 2013

J. Geosci.

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“…300 km from the Polish Sudetes (Kudowa-Olesnice and Kłodzko-Złoty Stock massifs - Mazur et al 2007) to the Bavarian Forest (migmatized I-type granitoids near Waldkirchen -Propach 2005), with the Central Bohemian Batholith near Prague (Janoušek et al 2000) as the major and best studied exposure. The Central Bohemian Batholith includes several generations of granitoids with variable deformation histories (Scheuvens & Zulauf 2000;Bues et al 2002;Žák et al 2005). The oldest, Devonian, I-type intrusions, as well as small bodies of I-type orthogneisses in the metamorphic roof of the batholith, dated to ca.…”

Section: Geological Backgroundmentioning

confidence: 99%

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

Finger¹,

Gerdes

René³

et al. 2009

Geologica Carpathica

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Abstract:On the basis of the synchronicity of geochronological data and the similarity of granite types, it is proposed that the mid-Carboniferous Fichtelgebirge/Erzgebirge Batholith in the Saxothuringian Zone of the central European Variscan Fold Belt and the South Bohemian Batholith in the Moldanubian Zone (including the intervening Oberpfalz and Bavarian Forest granite areas) belong to one coherent and cogenetic, ca. 400 km long plutonic megastructure. Unlike older (syn-collisional) plutonic structures in the Bohemian Massif, this Saxo-Danubian Granite Belt (nov. nom.) has developed discordant to the Devonian/Early Carboniferous collision-related tectonic architecture of the Bohemian Massif. It is argued that the Saxo-Danubian Granite Belt formed in response to a post-collisional detachment of lithospheric mantle below the south-western sector of the Bohemian Massif.

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“…c) Intragranitic pegmatites of NYF family (Škoda et al 2006;Škoda and Novák 2007;Novák and Filip 2010;Novák et al 2011Novák et al , 2012 occur exclusively in the Třebíč Pluton, western Moravia, and in the Čertovo břemeno (Milevsko) Pluton, southern Bohemia. Both plutons form large syn-exhumation tabular bodies (Dobeš and Pokorný 1988;Žák et al 2005) interpreted as a product of mixing between enriched mantle-derived magma and a crustal melt (Holub 1997;Janoušek et al 2000;Janoušek and Holub 2007). Typical minor to accessory minerals of pegmatites include common phlogopite, allanite-(Ce), tourmaline (dravite, schorl, fluor-schorl; Novák et al 2011), aeschynite-and euxenite-group minerals, titanite, ilmenite, actinolite, and rare beryl.…”

Section: Tectono-metamorphic and Magmatic Evolution Of The Moldanubiamentioning

confidence: 99%

Geological position, mineral assemblages and contamination of granitic pegmatites in the Moldanubian Zone, Czech Republic; examples from the Vlastějovice region

Novák¹,

Kadlec²,

Gadas³

2013

J. Geosci.

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Three groups of pegmatites distinct in their geological position, age, internal structure, mineral assemblages and chemical composition of minerals (tourmaline, amphibole, garnet, and biotite) were distinguished in the Vlastějovice region, Moldanubian Zone: a) tourmaline-bearing pegmatites (Qz + Kfs + Pl + Bt + Ms + Tur) enclosed in the pre-Variscan orthogneiss, b) contaminated amphibole-bearing pegmatites (Pl + Qz + Amp + Kfs + fluorite + allanite) hosted by the Fe-skarn, and c) tourmaline-bearing pegmatites cutting paragneisses (Qz + Kfs + Pl + Bt + Ms + Ab + Tur + Grt) and the Fe-skarn (Qz + Kfs + Pl + Bt + Tur ± Ab, Amp, Grt, elbaite). The pegmatites enclosed in the orthogneiss show simple internal structure and mineral assemblages, together with low degree of tectonometamorphic overprint. The amphibole--bearing pegmatites, likely anatectic and related to the Variscan MP-HT regional metamorphism, are spatially restricted to the Fe-skarn body and highly variable in shape, size, effects of in situ contamination by Ca, Fe ± F and REE from the host Fe-skarn, and degree of hydrothermal overprint. The tourmaline-bearing pegmatites related to the Variscan magmatic event cut different rocks (paragneisses, Fe-skarn bodies) and belong to the Moldanubian rare-element pegmatite province. They show distinct degree of textural differentiation, geochemical fractionation and external contamination by Ca and/or Fe (Ca,Fe-rich Al-poor tourmalines) higher in the less evolved pegmatite bodies in the Fe-skarn. The tourmaline-bearing pegmatites were evidently generated from the granite-pegmatite body in the footwall contact of the Fe-skarn. Degrees of the textural differentiation and geochemical fractionation of the individual tourmaline-bearing pegmatites are comparable to those of the respective parts of the parental Footwall granite-pegmatite body. This observation seems consistent with the model of sequential derivation of pegmatite melts from evolving parental granite. Primitive to highly evolved and usually B-rich pegmatites originated during the Variscan orogeny from the MP (~0.6-0.7 GPa) to the LP conditions (~0.2 GPa), and manifest that formation of various granitic pegmatites was an integral part of the tectonomagmatic evolution of the region.

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Tectonic evolution of a continental magmatic arc from transpression in the upper crust to exhumation of mid-crustal orogenic root recorded by episodically emplaced plutons: the Central Bohemian Plutonic Complex (Bohemian Massif)

Cited by 87 publications

References 20 publications

Distributions of Y + REE and Sc in tourmaline and their implications for the melt evolution; examples from NYF pegmatites of the Třebíč Pluton, Moldanubian Zone, Czech Republic

Distributions of Y + REE and Sc in tourmaline and their implications for the melt evolution; examples from NYF pegmatites of the Třebíč Pluton, Moldanubian Zone, Czech Republic

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

Geological position, mineral assemblages and contamination of granitic pegmatites in the Moldanubian Zone, Czech Republic; examples from the Vlastějovice region

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