Chemical composition of radioactive accessory minerals: implications for the evolution, alteration, age, and uranium fertility of the Fichtelgebirge granites (NE Bavaria, Germany)

Förster, H.-J.; Rhede, Dieter; Hecht, Lutz

doi:10.1127/0077-7757/2008/0117

Cited by 27 publications

(17 citation statements)

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“…The high-Th monazite was found also in the high-F, high-P 2 O 5 Li-mica granites from the German part of the Western Erzgebirge pluton (up to 51.7 wt % ThO 2 ) [27]. Some monazite grains from similar high-F granites described in the Fichtelgebirge pluton [3] could be designed also as high-Th monazite.…”

Section: Substitution In Monazitementioning

confidence: 86%

“…The cheralite substitution is dominant in the analyzed monazite from all the analyzed suites of the KGB. The predominance of the cheralite substitution over the huttonite substitution was also found in highly fractionated high-F, Li-mica granites from other parts of the Krušné Hory/Erzgebirge batholith and the Fichtelgebirge granites in NE Bavaria, Germany [3,9,27]. High contents of the cheralite component (>20-30 mol %) were also found in highly fractionated S-type granites from the West Carpathian belt [2] and in similar S-type granites from the Belvís de Monroy pluton in the Iberian Variscan belt [7].…”

Section: Substitution In Monazitementioning

confidence: 92%

“…In the last ten years, several studies have emphasized the role of monazite, xenotime, and zircon as major hosts for rare earth elements (REE) and Y in granites [1][2][3][4][5][6][7][8][9]. However, several factors controlling the composition of the above mentioned accessory minerals remain unclear.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Substitution In Monazitementioning

confidence: 86%

Section: Substitution In Monazitementioning

confidence: 92%

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

René

2018

Minerals

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“…However, it is important to note that the wide Y-, Th-and U spread observed in the monazite under study, is not untypical for grains, which formed in a magmatic milieu (e.g. Förster 1998;Förster et al 2008).…”

Section: Sources Of Metasedimentary Rocksmentioning

confidence: 92%

Provenance of Paleozoic very low- to low-grade metasedimentary rocks of South Tisia (Slavonian Mountains, Radlovac Complex, Croatia)

Biševac¹,

Krenn²,

Finger³

et al. 2013

Geologica Carpathica

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Monazite age dating, detrital heavy mineral content and whole-rock geochemistry provided insight into the provenance, depositional history and paleogeological setting of the Radlovac Complex very low-to low-grade metasedimentary rocks (South Tisia, Slavonian Mountains, Croatia). Electron microprobe based Th-U-Pb dating of detrital monazite indicates a Variscan age of the protolith (330 ± 10 Ma). The detrital heavy mineral assemblages of representative metasedimentary rocks are dominated by apatite, zircon, tourmaline and rutile accompanied by minor quantity of epidote/zoisite, monazite and titanite. Judging from the heavy mineral assemblage, felsic igneous rocks served as the source material. This is consistent with the major and trace element spectrum of studied metasedimentary rocks characterized by high concentration of Th, high L + MREEs and high ratios of La/Sc, Th/Sc, La/Co, Th/Co and Th/Cr. The occurrence of magmatic monazite, zircon and xenotime and the absence of metamorphic heavy minerals suggest that granitoids, migmatites and migmatitic gneisses served as one major source for the metapsammites. Such rock types are commonly exposed in the Papuk Complex of the older surrounding complexes, while the Psunj Complex also contains metamorphic rocks. This is in good correlation with the monazite ages presented here which fits better with ages of Papuk Complex representative rocks than with those of the Psunj Complex known from the literature. Overall, data show that the Radlovac Complex represents the detritus of the local Variscan crust characterized by granitoid bodies, migmatites and migmatitic gneisses typical for the Papuk Complex.

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“…The SADC has been subdivided (Wolf 1960;Lobin 1986;Schneider et al 2005;Förster et al 2008), from base to top, into: the 'Putzmühle Formation' (here named Schönfeld pre-eruption sediments, SPES), the 'Schönfeld Rhyolite' (here Lower Schönfeld Complex, LSC), and the 'Schönfeld Formation' with the overlying 'Mühlwald Formation' (here Upper Schönfeld Complex, USC). Based on our investigation, the old names are not precise enough or misleading; e.g.…”

Section: K R U š N é H O R Y F a U Ltmentioning

confidence: 99%

The Late Carboniferous Schönfeld-Altenberg Depression on the NW margin of the Bohemian Massif (Germany/Czech Republic): volcanosedimentary and magmatic evolution

Walther¹,

Breitkreuz²,

Rapprich³

et al. 2016

J. Geosci.

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The Altenberg-Teplice Volcanic Complex (ATVC) exposed on both sides of the German-Czech border in the Erzgebirge/ Krušné hory Mts. is one of the earliest late-Variscan to post-Variscan volcanic centres in Europe. The ATVC features an early volcanosedimentary succession preserved in the Schönfeld-Altenberg Depression Complex (SADC), covered by voluminous ignimbrites and lavas of the Teplice Rhyolite (TR). Published radiometric age dating of ATVC rocks and associated mineralizations suggest a Lower Namurian (Serpukhovian) age for the SADC. The SADC (10 × 15 km) was subdivided into the Schönfeld-Pre-Eruptive Sediments (SPES), and the volcanosedimentary successions of the Lower Schönfeld Complex (LSC) and the Upper Schönfeld Complex (USC). The SPES (maximum thickness of 60 m) is deposited on metamorphic basement and consists of sandstones and conglomerates with variable types of metamorphic clasts; it also contains carbonaceous layers. The LSC sequence starts with widespread, fine-grained ignimbrites (maximum thickness of 153 m) of rhyolitic composition. The explosive phase of the LSC was followed by the formation of (trachy-)dacitic lava(s) and subvolcanic bodies. The USC sequence commences with coarse-grained talus deposits, consisting of metamorphic clasts, indicating a major tectonic activity. Lavas and pyroclastic rocks dominate the USC in the southern part, whereas in the Schönfeld area (northern part), lava dome explosion-related pyroclastic and sedimentary deposits, alternating with carbonaceous layers, prevail. Charcoal fragments and fine charcoal dust is present in all SADC units as layers, or in the matrix of volcanosedimentary deposits. Allochtonous anthracite seams in the USC that were subject to historic mining in the Schönfeld area consist of a bedded alternation of carbonaceous deposits with clays to siltstones. Presumably, formation of charcoal was related to explosive eruptions and/or wild fires, and redeposition by alluvial processes. The SADC volcanic rocks are classified as dacites, trachy-dacites and rhyolites, having unusually elevated concentrations of Ti and compatible elements like Cr and V. Compared to the LSC, the USC volcanics show a less alkaline affinity. The studied samples are isotopically homogeneous, with εNd 325 = -2.4 to -3.3 and 87 Sr/ 86 Sr 325 = 0.70556-0.70626, pointing to a common source of magmas for both the LSC and the USC. The two-stage Nd model ages vary between 1.2 and 1.3 Ga, similar to coeval Saxothuringian granites from the Erzgebirge Mts. as well as volcanic rocks from the Intra-Sudetic Basin.

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Chemical composition of radioactive accessory minerals: implications for the evolution, alteration, age, and uranium fertility of the Fichtelgebirge granites (NE Bavaria, Germany)

Cited by 27 publications

References 0 publications

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

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

Provenance of Paleozoic very low- to low-grade metasedimentary rocks of South Tisia (Slavonian Mountains, Radlovac Complex, Croatia)

The Late Carboniferous Schönfeld-Altenberg Depression on the NW margin of the Bohemian Massif (Germany/Czech Republic): volcanosedimentary and magmatic evolution

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Chemical composition of radioactive accessory minerals: implications for the evolution, alteration, age, and uranium fertility of the Fichtelgebirge granites (NE Bavaria, Germany)

Cited by 27 publications

References 0 publications

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

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

Provenance of Paleozoic very low- to low-grade metasedimentary rocks of South Tisia (Slavonian Mountains, Radlovac Complex, Croatia)

The Late Carboniferous Sch&ouml;nfeld-Altenberg Depression on the NW margin of the Bohemian Massif (Germany/Czech Republic): volcanosedimentary and magmatic evolution

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Product

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The Late Carboniferous Schönfeld-Altenberg Depression on the NW margin of the Bohemian Massif (Germany/Czech Republic): volcanosedimentary and magmatic evolution