| Název | | |  | Koroze a barevné alterace buližníkových klastů (cenoman-spodní turon, česká křídová pánev) (12-23 Kladno, 12-24 Praha)
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| Údaj o odpovědnosti | | | | Jiří Žítt, Čestmír Nekovařík
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| Další názvy | |
| Autor | |
| Jazyk | | | | česky
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| Zdrojový dokument - seriál | |
| Strany | | | | s. 88-89
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| Rok | | | | 2000
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| Poznámky | | | | Anglické resumé
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| | | Obsahuje bibliografické odkazy
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| | | Zkr. název ser.: Zpr. geol. Výzk. v Roce 1999.
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| Předmětová skupina | |
| Geografické jméno | |
| Klíčové slovo | |
| Abstrakt (anglicky) | | | | A study of lydite clasts from the late Cenomanian-early Turonian conglomerates (Korycany Member) of the Bohemian Cretaceous Basin shows that they sometimes experienced very complicated set of processes. In addition to the physical and biological processes, the chemical effects, recorded as corrosion and colour alternation are the most important. Soft corrosion of clasts often affects their surfaces but the deep one may change even the clast shape. The colour alternations of clasts may be only superficial in the form of patinas or may deeply penetrate the clast matter (alternation into greenish and mainly yellow colours). The age of both the corrosion and colour alternations was proved by Cretaceous encrustation (epibionts), boring and mineralization (phosphatic crusts) of affected surfaces and by the occurrence the "in situ" Cretaceous deposits.
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| | Corrosion and colour alternations undoubtedly reflect special (possibly subaerial) palaeoenvironmental conditions affecting the coarse marine clastics, most probably during their subaerial exposure. The problems are now being studied in more detail
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| Přispěvatel | | | | Česká geologická služba
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| Kód přispěvatele | | | | ČGS (UNM)
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| Zdrojový formát | | | | U
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| Datum vložení | | | | 31. 3. 2008 |
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| Datum importu | | | | 8. 8. 2012 |
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