Gamma-ray spectrometry across the Upper Devonian basin succession at Kowala in the Holy Cross Mountains (Poland)

• Autorzy: Bond D. , Zatoń M.
• Języki publikacji: EN

Abstrakty

EN

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.

Słowa kluczowe

EN

Annulata Event; Devonian; Frasnian-Famennian boundary; gamma-ray spectrometry; Holy Cross Mountains; Kellwasser Event

• Wydawca: Faculty of Geology of the University of Warsaw ; Komitet Nauk Geologicznych PAN
• Czasopismo: Acta Geologica Polonica
• Rocznik: 2003
• Tom: Vol. 53, nr 2
• Strony: 93--99
• Opis fizyczny: Tabl. 1, rys.,Bibliogr. 44 poz.,

Twórcy

autor

Bond D.

autor

Zatoń M.

• School of Earth Sciences, University of Leeds, LS2 9JT, United Kingdom,