Author: Suchý V. Sýkorová I. Melka K. Filip J. Machovič V.
Publisher: Mineralogical Society
ISSN: 1471-8030
Source: Clay Minerals, Vol.42, Iss.4, 2007-12, pp. : 503-526
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Abstract
Metamorphic grade, palaeothermal history and the influence of tectonic strain on clay minerals and organic matter transformation were studied in the eastern part of the Teplá-Barrandian unit in the Czech Republic. The metamorphic grade of pelitic sediments ranges from the lower anchizone (IC ∼0.30–0.36Δ°2θ) to the lowermost epizone (IC ∼0.24–0.26Δ°2θ). Increase in metamorphic grade is paralleled by the development of anastomosing cleavage and lenticular quartz grains in the anchizone which give way to slaty cleavage and dynamically recrystallized ribbon quartz grains in the lower epizone. White mica in highly strained rocks generally has greater IC values whereas chlorite displays reduced values in deformed and cleaved samples. The organic matter dispersed in the sediments represents a complex assemblage of highly matured particles of uncertain origin, pyrobitumen and 'transitional matter'. The reflectance of organic fragments generally varies from 3.1% to 7.7% of
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