Genetic aspects of barite mineralization related to rocks of the teschenite association in the Silesian Unit, Outer Western Carpathians, Czech Republic

Abstract

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

Fluorcaphite from hydrothermally altered teschenite at Tichá, Outer Western Carpathians, Czech Republic: compositional variations and origin

“…non-magmatic) fluids, is thus compatible with the available geological and geochemical data. An analogous fluid regime was also described from other sites in the Silesian Unit, where post-magmatic veins occur in magmatic rocks of the teschenite association (Dolníček et al, 2010b(Dolníček et al, , 2012Urubek et al, 2014;Kropáč et al, 2015;Jirásek et al, 2017). On the basis of fluid inclusions, C and O stable isotopes and Sr isotope studies, all these investigations document the crucial role of Lower Cretaceous seawater as well as diagenetic waters (derived by thermal alteration FIG.…”

Origin of barite deposits in dolomite-limestone units, Gazipasa, Eastern of Antalya: geology, geochemistry, statistics, sulfur isotope composition

“…Taking into account the PCA analysis used five factors in Table 9, factor F1 contains SiO2, MgO, Na2O, TiO2, Ba, Sr, TOTS, Cs, Rb, Th, Zr, Ce, Dy, Ni, As, Tl; factor F2 contains MnO, Ba, Yb, Cd, Sb, Bi, Ag, Se; factor F3 contains LOI, SO3, TOTC, Ga; factor F4 contains K2O, Pr, Nd, Tm, Mo, Cu; factor F5 contains P2O5, Tm, Lu, Pb. BT16,17,8,13,3,9,15,19,12,4,10,20,14,18,2,6 and 11 in the dendogram analysis of the Hierarchical Cluster Analysis which is based on the XRF results of 20 barite samples, among themselves; BT1 and 7 in between present similarities. BT1, 7, and 5 do not resemble the others of the previous examples.…”