Crystallochemical effects of heat treatment on Fe-dominant tourmalines from Dolní Bory (Czech Republic) and Vlachovo (Slovakia)

Bačík, Peter; Ozdín, Daniel; Miglierini, Marcel; Kardošová, P.; Pentrák, Martin; Haloda, J.

doi:10.1007/s00269-011-0432-5

Cited by 33 publications

(15 citation statements)

References 19 publications

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“…Their main results include: (1) thermal oxidation of Fe 2+ to Fe 3+ in tourmaline starts at a temperature of about 600°C (Bogdanova et al, 1981;Povondra and Laštovičková, 1989;Afonina et al, 1993;Fuchs et al, 2002;Pieczka and Kraczka, 2004;Castañ eda et al, 2006;Bačík et al, 2011), leading to a change of color to brown or reddish brown (Castañ eda et al, 2006;Ertl and Rossman, 2007;Bačík et al, 2011); (2) at elevated temperature, Al and Fe 3+ become disordered over the Y and Z sites (Afonina et al, 1993;Pieczka and Kraczka, 2004;Castañ eda et al, 2006;McKeown, 2008); (3) oxidized tourmaline loses H and F (Pieczka and Kraczka, 2004;Castañ eda et al, 2006;McKeown, 2008;Bačík et al, 2011); (4) oxidation of Fe 2+ in schorl changes the dimensions of the Y site and partly also of the Z site, and moreover, the unit-cell parameters approach those characteristic of "buergerite" (Bogdanova et al, 1981;Povondra and Laštovičková, 1989;Pieczka and Kraczka, 2004;Bačík et al, 2011); (5) above a temperature of about 900°C the tourmaline decomposes (Povondra and Laštovičková, 1989;Afonina et al, 1993;Pieczka and Kraczka, 2004;Castañ eda et al, 2006;McKeown, 2008;Bačík et al, 2011). The published experiments were almost exclusively performed under oxidizing conditions (i.e., in air); however, different structural aspects might appear under reducing conditions.…”

Section: Introductionmentioning

confidence: 95%

Iron redox reactions in the tourmaline structure: High-temperature treatment of Fe3+-rich schorl

Filip

Bosi

Novák

et al. 2012

Geochimica et Cosmochimica Acta

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Section: Introductionmentioning

confidence: 95%

Iron redox reactions in the tourmaline structure: High-temperature treatment of Fe3+-rich schorl

Filip

Bosi

Novák

et al. 2012

Geochimica et Cosmochimica Acta

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“…It is controlled by the incongruent melting of tourmaline, which has been observed in experiments between 725 and 950 °C depending on pressure and composition (e.g. Morgan & London 1989 Goerne et al 1999;Bačík et al 2011;London 2011;van Hinsberg 2011). Pressure stability of tourmaline is also very wide.…”

Section: Provenance Of Tourmalinesmentioning

confidence: 99%

“…Jolliff et al 1986;Selway et al 1999;Tindle et al 2002), rossmanite , and liddicoatite (Teerstra et al 1999). However, granitic pegmatites usually comprise schorlitic to foititic Selway et al 1999;Bačík et al 2011) and more rarely also dravitic tourmalines Bačík et al 2012).…”

Section: Provenance Of Tourmalinesmentioning

confidence: 99%

“…Absence of inherited cores and overgrowths in the tourmalines studied suggests that these crystallized during only one genetic event. The possibility of a homogenization process can be excluded since these tourmalines do not exhibit any features (increased F, T Al, T B, and Ca content, for example) typical for high-grade metamorphism with temperatures over 700 °C necessary for initiation of diffusion in tourmalines (Bačík et al 2011;Ertl et al 2012).…”

Section: Provenance Of Tourmalinesmentioning

confidence: 99%

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Provenance of the Permian Malužiná Formation sandstones (Malé Karpaty Mountains, Western Carpathians): evidence of garnet and tourmaline mineral chemistry

Vďačný¹,

Bačík²

2015

Geologica Carpathica

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Abstract:The chemistry of detrital garnets (almandine; spessartine-, grossular-, and pyrope-rich almandine; andradite) and mostly dravitic tourmalines from three sandstone samples of the Permian Malužiná Formation in the northern part of the Malé Karpaty Mts (Western Carpathians, SW Slovakia) reveals a great variability of potential source rocks. They comprise (1) low-grade regionally metamorphosed rocks (metacherts, blue schists, metapelites and metapsammites), (2) contact-thermal metamorphic calcareous rocks (skarns or rodingites), (3) garnet-bearing mica schists and gneisses resulting from the regional metamorphism of argillaceous sediments, (4) amphibolites and metabasic sub-ophiolitic rocks, (5) granulites, (6) Li-poor granites and their associated pegmatites and aplites as well as (7) rhyolites. Consequently, the post-Variscan, rift-related sedimentary basin of the Malužiná Formation originated in the vicinity of a low-to high-grade crystalline basement with granitic rocks. Such lithological types of metamorphic and magmatic rocks are characteristic for the Variscan terranes of the Central Western Carpathians (Tatricum and Veporicum Superunits).

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“…1) on difractometer BRUKER D8 Advance in Bragg-Brentano geometry (theta-2theta). The XRD patterns were collected using Cu Kα 1 (λ Kα1 =1.5406 Å) radiation in the 10-65 2θ range with 0.01 step size and a counting time of 1 s per step (Bačík et al 2011). …”

Section: Amorphous Feox Preparationmentioning

confidence: 99%

Biologically Induced Mobilization of Arsenic Adsorbed onto Amorphous Ferric Oxyhydroxides in Aqueous Solution During Fungal Cultivation

Urík

Bujdoš

Milová

2014

Water Air Soil Pollut

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This paper evaluates heterotrophic leaching of arsenic (As) pre-adsorbed onto amorphous ferric o x y hy d r o x i d e s ( F e O x ) a nd i t s su b s e q ue n t biovolatilization under laboratory conditions during Aspergillus niger static cultivation. With initial 90 mg.L −1 As concentration and absence of FeOx, the biomass As accumulation capacity attained 1.4 mg.g −1 on the 15th day of cultivation. While FeOx suppressed As biomass accumulation up to 0.23 mg.g −1 , it did not influence biovolatilization activity. After 15-day cultivation, almost 1.8 mg As was released into the surrounding culture media, accumulated and subsequently transformed into its volatile derivatives, regardless of FeOx presence or absence. The A. niger strain was able to enhance As release from the FeOx surfaces; the total As medium concentration increased to 3.1 mg.L −1 on the 15th cultivation day, and this amount was considerably higher than the 0.128 mg.L −1 As concentration leached from FeOx in fungal absence. These observations indicate that complex mutual interactions between As immobilized in FeOx and filamentous fungi are environmentally significant regarding As mobility and transformation in oxic environments.

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Crystallochemical effects of heat treatment on Fe-dominant tourmalines from Dolní Bory (Czech Republic) and Vlachovo (Slovakia)

Cited by 33 publications

References 19 publications

Iron redox reactions in the tourmaline structure: High-temperature treatment of Fe3+-rich schorl

Iron redox reactions in the tourmaline structure: High-temperature treatment of Fe3+-rich schorl

Provenance of the Permian Malužiná Formation sandstones (Malé Karpaty Mountains, Western Carpathians): evidence of garnet and tourmaline mineral chemistry

Biologically Induced Mobilization of Arsenic Adsorbed onto Amorphous Ferric Oxyhydroxides in Aqueous Solution During Fungal Cultivation

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