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  • Central Library of the Slovak Academy of Sciences  (3)
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  • Central Library of the Slovak Academy of Sciences  (3)
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  • 1
    Online Resource
    Online Resource
    Genetic aspects of barite mineralization related to rocks of the teschenite association in the Silesian Unit, Outer Western Carpathians, Czech Republic
    Central Library of the Slovak Academy of Sciences ; 2017
    In:  Geologica Carpathica Vol. 68, No. 2 ( 2017-04-1), p. 119-129
    Details
    In: Geologica Carpathica, Central Library of the Slovak Academy of Sciences, Vol. 68, No. 2 ( 2017-04-1), p. 119-129
    Abstract: Barite is a relatively uncommon phase in vein and amygdule mineralizations hosted by igneous rocks of the teschenite association in the Silesian Unit (Western Carpathians). In macroscopically observable sizes, it has been reported from 10 sites situated only in the Czech part of the Silesian Unit. Microscopic barite produced by the hydrothermal alteration of rock matrix and also by the supergene processes is more abundant. We examined four samples of barite by mineralogical and geochemical methods. Electron microprobe analyses proved pure barites with up to 0.038 apfu Sr and without remarkable internal zonation. Fluid inclusion and sulphur isotope data suggests that multiple sources of fluid components have been involved during barite crystallization. Barite contains primary and secondary aqueous all-liquid (L) or less frequent two-phase (L+V) aqueous fluid inclusions with variable salinity (0.4-2.9 wt. % NaCl eq.) and homogenization temperatures between 77 and 152 °C. The higher-salinity fluid endmember was probably Cretaceous seawater and the lower-salinity one was probably diagenetic water derived from surrounding flysch sediments during compaction and thermal alteration of clay minerals. The δ 34 S values of barite samples range between -1.0 ‰ and +16.4 ‰ CDT suggesting participation of two sources of sulphate, one with a near-zero δ 34 S values probably derived from wall rocks and another with high δ 34 S values being most probably sulphate from the Cretaceous seawater. All results underline the role of externally derived fluids during post-magmatic alteration of bodies of rock of the teschenite association.
    Type of Medium: Online Resource
    ISSN: 1336-8052
    URL: Article
    DOI: 10.1515/geoca-2017-0010
    Language: Unknown
    Publisher: Central Library of the Slovak Academy of Sciences
    Publication Date: 2017
    detail.hit.zdb_id: 2161601-2
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    Online Resource
  • 2
    Online Resource
    Online Resource
    Genesis of Syntectonic Hydrothermal Veins in the Igneous Rock of Teschenite Association (Outer Western Carpathians, Czech Republic): Growth Mechanism and Origin of Fluids
    Central Library of the Slovak Academy of Sciences ; 2015
    In:  Geologica Carpathica Vol. 65, No. 5 ( 2015-01-31), p. 419-431
    Details
    In: Geologica Carpathica, Central Library of the Slovak Academy of Sciences, Vol. 65, No. 5 ( 2015-01-31), p. 419-431
    Abstract: Hydrothermal mineralization hosted by the Lower Cretaceous igneous rock of the teschenite association at Jasenice (Silesian Unit, Flysch Belt, Outer Western Carpathians) occurs in two morphological types - irregular vein filled by granular calcite and regular composite vein formed by both fibrous and granular calcite and minor chlorite, quartz, and pyrite. Crosscutting evidence indicates that the granular veins are younger than the composite vein. The composite vein was formed by two mechanisms at different times. The arrangement of solid inclusions in the marginal fibrous zone suggests an episodic growth by the crack-seal mechanism during syntectonic deformation which was at least partially driven by tectonic suction pump during some stages of the Alpine Orogeny. Both the central part of the composite vein and monomineral veins developed in a brittle regime. In these cases, the textures of vein suggest the flow of fluids along an open fracture. The parent fluids of both types of vein are characterized by low temperatures (Th=66-163 °C), low salinities (0.4 to 3.4 wt. % NaCl eq.), low content of strong REE-complexing ligands, and δ 18 O and δ 13 C ranges of + 0.2/+12.5 %. SMOW and -11.8/-14.1 %. PDB, respectively. The parent fluids are interpreted as the results of mixing of residual seawater and diagenetic waters produced by dewatering of clay minerals in the associ-ated flysch sediments. The flow of fluids was controlled by tectonic deformation of the host rock.
    Type of Medium: Online Resource
    ISSN: 1336-8052
    URL: Article
    DOI: 10.1515/geoca-2015-0003
    Language: Unknown
    Publisher: Central Library of the Slovak Academy of Sciences
    Publication Date: 2015
    detail.hit.zdb_id: 2161601-2
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  • 3
    Online Resource
    Online Resource
    Post-magmatic hydrothermal mineralization associated with Cretaceous picrite (Outer Western Carpathians, Czech Republic): interaction between host rock and externally derived fluid
    Central Library of the Slovak Academy of Sciences ; 2010
    In:  Geologica Carpathica Vol. 61, No. 4 ( 2010-08-1), p. 327-339
    Details
    In: Geologica Carpathica, Central Library of the Slovak Academy of Sciences, Vol. 61, No. 4 ( 2010-08-1), p. 327-339
    Abstract: Mineralogy, fluid inclusions, C, O, S, Sr isotopes and trace elements have been studied in amygdule and vein mineralization hosted by the Lower Cretaceous effusive picrite at Hončova hůrka (Silesian Unit, Flysch Belt of the Outer Western Carpathians). Besides dominating dolomite, magnesite, siderite, quartz, calcite, chlorite, glauconite, fluorite, barite, pyrite and millerite were also identified. The parent fluids are characterized by low temperatures ( 〈 50-170°C), low salinities (0.4 to 3.7 wt. % NaCl eq.), low content of strong REE-complexing ligands, δ 18 O, δ 13 C and δ 34 S ranges of 0/+ 14 ‰ SMOW, 0/-9 ‰ PDB and ~0 ‰ CDT, respectively, and initial 87 Sr/ 86 Sr ratios much more radiogenic (0.7060 to 0.7068) than those of host picrite (0.7042 and 0.7046). The fluids are interpreted to be predominantly of external origin, derived from mixing of seawater with diagenetic waters produced by dewatering of clay minerals in the associated flysch sediments. The isotope and REE signatures indicate interaction of at least a part of fluids with sedimentary carbonates. The interaction of fluids with host picrite led to strong alteration of rock-forming minerals and leaching of some elements (Mg, Ni, S, partly also REE) that widely participated during precipitation of vein- and amygdule-hosted mineral phases.
    Type of Medium: Online Resource
    ISSN: 1336-8052 , 1335-0552
    URL: Article
    DOI: 10.2478/v10096-010-0019-y
    Language: Unknown
    Publisher: Central Library of the Slovak Academy of Sciences
    Publication Date: 2010
    detail.hit.zdb_id: 2161601-2
    SSG: 13
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