http://hdl.handle.net/20.500.12128/10393
Tytuł: | Gamma-ray spectrometry across the Upper Devonian basin succession at Kowala in the Holy Cross Mountains (Poland) |
Autor: | Bond, Dave Zatoń, Michał |
Słowa kluczowe: | Devonian; Kellwasser Event; Annulata Event; Frasnian-Famennian boundary; Holy Cross Mountains; Gamma-ray spectrometry |
Data wydania: | 2003 |
Źródło: | Acta Geologica Polonica, 2003, vol 53, No. 2, s. 93-99 |
Abstrakt: | The Upper Devonian sequence at Kowala in the Holy Cross Mountains was logged using gamma-ray spectrometry, for investigating the changes of oxygenation level in the Late Devonian basin. The Th/U ratio indicates that oxygen levels were low throughout the Late Frasnian interval, with low peaks during the Kellwasser Events showing anoxic conditions in the basin. The F-F boundary interval was also oxygen deficient, but there may have been a brief reoxygenation at the boundary itself. By the Famennian crepida Zone, the basin gradually began to reoxygenate, but in the trachytera Zone another anoxic event, the Annulata Event occurred, causing a bloom rather than extinction of specially adapted taxa such as Guerichia. Thus the gamma-ray spectrometry data suggests that basinal anoxia prevailed through much of the Late Frasnian. The F-F extinction might have been the result of prolonged stresses imposed on the ecosystem, particularly during the euxinic Upper Kellwasser Event. |
URI: | http://hdl.handle.net/20.500.12128/10393 |
ISSN: | 0001-5709 2300-1887 |
Pojawia się w kolekcji: | Artykuły (WNP) |
Plik | Opis | Rozmiar | Format | |
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Bond_Gamma-ray_spectrometry_across_the_Upper_Devonian_basin.pdf | 1,36 MB | Adobe PDF | Przejrzyj / Otwórz |
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