Neuspořádaný uhlík v tektonických zónách paleozoických sedimentů (devon moravskoslezského paleozoika)

SLOBODNÍK, Marek, Dalibor VŠIANSKÝ, Karel SLAVÍČEK, Marie POLÁČKOVÁ a Jiří HUZLÍK. Neuspořádaný uhlík v tektonických zónách paleozoických sedimentů (devon moravskoslezského paleozoika). Geologické výzkumy na Moravě a ve Slezsku. Masarykova univerzita, 2021, roč. 28, 1-2, s. 73-84. ISSN 1212-6209. Dostupné z: https://dx.doi.org/10.5817/GVMS2021-15627.

Základní údaje

• Originální název: Neuspořádaný uhlík v tektonických zónách paleozoických sedimentů (devon moravskoslezského paleozoika)
• Název česky: Neuspořádaný uhlík v tektonických zónách paleozoických sedimentů (devon moravskoslezského paleozoika)
• Název anglicky: Disodered carbon in tectonic zones of the Palaeozoic sediments (Devonian of the Moravosilesian Palaeozoic)
• Autoři: SLOBODNÍK, Marek (203 Česká republika, garant, domácí), Dalibor VŠIANSKÝ (203 Česká republika, domácí), Karel SLAVÍČEK (203 Česká republika, domácí), Marie POLÁČKOVÁ (203 Česká republika) a Jiří HUZLÍK.
• Vydání: Geologické výzkumy na Moravě a ve Slezsku, Masarykova univerzita, 2021, 1212-6209.

Další údaje

• Originální jazyk: čeština
• Typ výsledku: Článek v odborném periodiku
• Obor: 10505 Geology
• Stát vydavatele: Česká republika
• Utajení: není předmětem státního či obchodního tajemství
• WWW: Text článku
• Kód RIV: RIV/00216224:14310/21:00123841
• Organizační jednotka: Přírodovědecká fakulta
• Doi: http://dx.doi.org/10.5817/GVMS2021-15627
• Klíčová slova anglicky: Moravo-Silesian Palaeozoic; carbonate strata; black carbonaceous matter; deformation structures; Raman spectra; disordered carbon; organic matter; temperatures
• Štítky: rivok
• Příznaky: Mezinárodní význam, Recenzováno

Anotace

Dark carbonaceous matter staining tectonic zones and deformed carbonate strata of the Moravo-Silesian Palaeozoic were studied by several methods. Samples were taken from tectonic structures in the quarry in Čebín and in the middle quarry in Mokrá near Brno. The grey-black-coloured rocks are clearly macroscopically and microscopically deformed, show traces of brittle ductile shear deformation and with foliation developed. The dark colour is caused by the presence of black carbon matter, which is documented by methods of optical and electron (BSE) microscopy and Raman spectra. The mineral assemblage has the character of hydrothermal mineralization migrating along tectonic structures. Mineralization consists mainly of quartz, carbonates (calcite, dolomite), phyllosilicates (mica, chlorite, kaolinite), pyrite and it also includes black carbon. Apatite is one of the interesting and unusual components. The content of organic and elemental carbon determined by the thermo-optical method in intensively mineralized zones is around 2.5 mass %. The carbonaceous matter was more accurately identified using Raman spectra. The spectra at the two studied localities have a very similar shape and are very close to the spectra of black carbon in low-grade carbon coal matter, very disordered carbon and/or amorphous carbon (coal, kerogen). The spectra show the presence of peaks in the D, G and 2D regions and are different from the spectra of ordered and disordered graphite. The presence of a small peak G in the analysed spectra (Lorentzian function) also indicates the possible presence of a small amount of more ordered carbon in the studied black carbon matter. The components of the black mineralized zones were most likely mobilized from the surrounding rock formations during the Variscan tectono-metamorphic events. The similarity with the spectra of poorly ordered carbon matter from low metamorphic conditions shows transformation temperatures of 150–280 °C, which is in accordance with other thermometric methods in the region of the southern edge of the Moravo-Silesian Palaeozoic.

Anotace anglicky

Dark carbonaceous matter staining tectonic zones and deformed carbonate strata of the Moravo-Silesian Palaeozoic were studied by several methods. Samples were taken from tectonic structures in the quarry in Čebín and in the middle quarry in Mokrá near Brno. The grey-black-coloured rocks are clearly macroscopically and microscopically deformed, show traces of brittle ductile shear deformation and with foliation developed. The dark colour is caused by the presence of black carbon matter, which is documented by methods of optical and electron (BSE) microscopy and Raman spectra. The mineral assemblage has the character of hydrothermal mineralization migrating along tectonic structures. Mineralization consists mainly of quartz, carbonates (calcite, dolomite), phyllosilicates (mica, chlorite, kaolinite), pyrite and it also includes black carbon. Apatite is one of the interesting and unusual components. The content of organic and elemental carbon determined by the thermo-optical method in intensively mineralized zones is around 2.5 mass %. The carbonaceous matter was more accurately identified using Raman spectra. The spectra at the two studied localities have a very similar shape and are very close to the spectra of black carbon in low-grade carbon coal matter, very disordered carbon and/or amorphous carbon (coal, kerogen). The spectra show the presence of peaks in the D, G and 2D regions and are different from the spectra of ordered and disordered graphite. The presence of a small peak G in the analysed spectra (Lorentzian function) also indicates the possible presence of a small amount of more ordered carbon in the studied black carbon matter. The components of the black mineralized zones were most likely mobilized from the surrounding rock formations during the Variscan tectono-metamorphic events. The similarity with the spectra of poorly ordered carbon matter from low metamorphic conditions shows transformation temperatures of 150–280 °C, which is in accordance with other thermometric methods in the region of the southern edge of the Moravo-Silesian Palaeozoic.