Accessory minerals of the C�novec (Zinnwald) granite cupola, Czech Republic: indicators of petrogenetic evolution

Johan, Zdeněk; Johan, V.

doi:10.1007/s00710-004-0058-0

Cited by 68 publications

(43 citation statements)

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“…Overall, the entry of Th into the REE-carbonates seems to be matched by Ca via the substitution Th 4+ + Ca 2+ =2REE 3+ (Fig. 8), as found by Johan and Johan (2005) in bastnäsite-(Ce) from the Cínovec granite cupola, Czech Republic. Chondrite normalised REE patterns age given in Fig.…”

Section: Bastnäsite-(ce)mentioning

confidence: 58%

“…The abundances of certain non-formula elements are high: P 2 O 5 ≤ 8.24 wt.%, CaO ≤3.02 wt.%; ΣREE 2 O 3 ≤22.44 wt.%; FeO* 4.05 wt.%, and TiO 2 ≤2.05 wt.%, the REE being dominated by the LREE. These elements are known to be incorporated into ThSiO 4 during interaction with hydrothermal fluids (Lumpkin and Chakoumakos 1988;Pointer et al 1988;Johan and Johan 2005;Förster 2006;Berger et al 2008;Uher et al 2009;Soman et al 2010;Piilonen et al 2013). The proportion of OH in the formulae was calculated from charge balance and ranged from 0.0 to 2.4 (Supplementary Table 2b).…”

Section: Thsiomentioning

confidence: 99%

“…Data from Supplementary Table 1b. Compositions of bastnäsite-(Ce) from the Cínovec granite cupola, Czech Republic, are given for comparison (Johan and Johan 2005). The location of the majority of analyses below the x+y=2 line may partly be due to the presence of MREE and HREE just below the limit of detection of the electron microprobe technique Fig.…”

Section: Nb-bearing Phasesmentioning

confidence: 99%

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Hydrothermal alteration of a chevkinite-group mineral to a bastnäsite-(Ce)-ilmenite- columbite-(Fe) assemblage: interaction with a F-, CO2-rich fluid

et al. 2015

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The results are presented of a textural and mineral chemical study of a previously undescribed type of hydrothermal alteration of chevkinite-(Ce) which occurs in a syenitic pegmatite from the Vishnevye Mountains, Urals Region, Russia. The progressive alteration of the chevkinite to a bastnäsite-(Ce)-ilmenite-columbite-(Fe) assemblage through a series of texturally complex intermediate stages is described and electron microprobe analyses are given of all the major phases. Unusual Nb±Th-rich phases formed late in the alteration sequence provide evidence of local Nb mobility. The main compositional fluxes are traced, especially of the REE, HFSE, Th and U. It appears that almost all elements, with the exception of La, released from the chevkinite-(Ce) were reincorporated into later phases, such that they did not leave the alteration crust in significant amounts. The hydrothermal fluids are inferred to have been F-and CO 2 -rich, with variable levels of Ca activity, and with fO 2 mainly between the nickelnickel oxide and magnetite-hematite buffers. This occurrence represents a new paragenesis for a columbite-group mineral.

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Section: Bastnäsite-(ce)mentioning

confidence: 58%

Section: Thsiomentioning

confidence: 99%

Section: Nb-bearing Phasesmentioning

confidence: 99%

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Hydrothermal alteration of a chevkinite-group mineral to a bastnäsite-(Ce)-ilmenite- columbite-(Fe) assemblage: interaction with a F-, CO2-rich fluid

et al. 2015

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“…However, only the routine use of electron probe micro-analysis and LA-ICP MS methods during the last 20 years has produced reliable data concerning the contents of many elements Wang et al 2000;Huang et al 2002;Rubatto 2002;Hoskin & Schaltegger 2003;Finch & Hanchar 2003;Pettke et al 2005;Johan & Johan 2005;Breiter et al 2006;Péréz-Soba et al 2007;Grimes et al 2007;Van Lichtervelde et al 2009). So far, the most comprehensive study of the chemical composition of zircons from various types of magmatic rocks obtained using the ICP-MS method was published by Belousova et al (2002).…”

Section: Introductionmentioning

confidence: 99%

“…Elements such as P, Y and REE were not analysed. Johan & Johan (2005) analysed the following 16 elements in zircon from Cínovec: P, Si, Zr, Hf, Th, U, Pr, Sm, Dy, Er, Yb, Y, Sc, Fe, Ca, and F and found significant differences in the compositions of zircons from the zinnwaldite and protolithionite granites. Their interpretation is based on the idea that the zinnwaldite granite is of metasomatic origin.…”

Section: Introductionmentioning

confidence: 99%

Vertical zonality of fractionated granite plutons reflected in zircon chemistry: the Cínovec A-type versus the Beauvoir S-type suite

Breiter¹,

Škoda²

2012

Geologica Carpathica

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Abstract:We studied vertical changes in the chemical composition of zircon from two contrasting Variscan granite systems. The Beauvoir system (Massif Central, France) composed of three successive intrusions (B1, B2, B3) represents typical peraluminous S-type granite extremely enriched in P, F, Li, Rb, Cs, Be, Sn, Nb, Ta, and poor in Zr, Th, REE and Y. The Cínovec system (Krušné hory Mts/Erzgebirge, Czech Republic/Germany) composed of two successive intrusions (protolithionite granite, zinnwaldite granite) is only slightly peraluminous, P-poor, F, Li, Rb, Cs, U, Th, REE, Y, Sc, Sn, W, Nb, Ta-rich granite, which may be classified as A-type. In both localities, the most fractionated intrusions are located on the top of the system. Samples from borehole GPF-1 (Beauvoir) represent an 800 m long vertical section through the entire granite stock, while CS-1 borehole (Cínovec) reached a depth of 1600 m. Chemical compositions of zircons from both granite systems show distinct vertical zonality, but their shape and elemental speciation is highly contrasting. At Beauvoir, zircon shows a remarkable increase in Hf-content from 2-4 wt. % HfO 2 (~0.03 apfu Hf) in the deepest B3-unit to 15-19 wt. % HfO 2 (up to 0.18 apfu Hf) in the uppermost B1-unit. The highest contents of F, P, and U were detected in the intermediate unit B2 at a depth of 400-600 m. At Cínovec, Hf shows only moderate enrichment from ca. 2 wt. % HfO 2 in the deeper protolithionite granite to 5-10 wt. % HfO 2 in the uppermost part of the zinnwaldite granite. High contents of Th (3-8 wt. % ThO 2 ) are entirely bound in the uppermost section of the granite copula to a depth of 200 m, but below this level the contents only sporadically exceed 1 wt. % ThO 2 . Concentrations of U, Y, HREE, Sc and Bi also reach their highest values in the uppermost parts of the zinnwaldite granite, but their decrease downward is much gentler. Extreme enrichment of outer zones of zircon crystals from some granites with Hf or high contents of Th, U, REE, Y, Nb and of some other elements in zircons from other localities is not considered to be a specific phenomenon characterizing melts of A-or S-type granite, but reflects a high degree of fractionation of systems rich in Na and F.

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Geochemistry and Mineralogy

Craigie

2018

Advances in Oil and Gas Exploration &Amp; Production

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Accessory minerals of the C�novec (Zinnwald) granite cupola, Czech Republic: indicators of petrogenetic evolution

Cited by 68 publications

References 20 publications

Hydrothermal alteration of a chevkinite-group mineral to a bastnäsite-(Ce)-ilmenite- columbite-(Fe) assemblage: interaction with a F-, CO2-rich fluid

Hydrothermal alteration of a chevkinite-group mineral to a bastnäsite-(Ce)-ilmenite- columbite-(Fe) assemblage: interaction with a F-, CO2-rich fluid

Vertical zonality of fractionated granite plutons reflected in zircon chemistry: the Cínovec A-type versus the Beauvoir S-type suite

Geochemistry and Mineralogy

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