Informace o publikaci
Charakteristika pseudofulguritu ze Žatčan u Brna, Česká republika
| Autoři | |
|---|---|
| Rok publikování | 2021 |
| Druh | Článek v odborném periodiku |
| Časopis / Zdroj | Acta Musei Moraviae, Scientiae geologicae |
| Fakulta / Pracoviště MU | |
| Citace | |
| www | Text článku |
| Klíčová slova | pseudofulgurite; chemical composition; Czech Republic |
| Popis | Pseudofulgurite from Žatčany near Brno originated after a fall of high voltage cables (22 kV) at several intermittent places where they touched the ground (partly anthropogenic loam-sandy sediment with gravel admixture). Branched, tubular and irregular aggregates, up to 10 cm in size, were formed in similar way as some fulgurites. Pseudofulgurite is brown-black in color, with numerous bubbles of the order of mm in size, in the case of tubular shapes with a central rounded and square channel. It consists of several types of glasses, including rare lechatelierite. They contain sporadically submicroscopic metal balls composed of native Fe, alternatively with a proportion of P, Ni, Si, Co and Cr, demonstrating a strongly reduced environment. Rather rare crystalline phases have the composition of Ca-Fe-Al-Si (±Ti), also relics of quartz and sporadic biotite can be observed locally. A lower K 2 O / Na 2 O ratio of 2.53–0.13 and a relatively high proportion of highly volatile S may also indicate a relatively lower melting point. |