Trace element variations as a proxy for reconstruction of palaeoenvironmental changes during the Late Aeronian faunal and carbon isotope perturbations: new data from the peri-Gondwanan region

• Autorzy: Pašava J. , Frýda J. , Štorch P.

Identyfikatory

DOI

10.7306/gq.1313

• Języki publikacji: EN

Abstrakty

EN

Trace element variations in the Upper Aeronian (Llandovery, Lower Silurian), deep-water, black shale succession of the Barrandian area (Perunica) were studied across an interval associated with a graptolite mass extinction and global, positive carbon isotope anomaly. The main aim of the paper is to test whether distinct changes in graptolite diversity during Late Aeronian were linked with changes in deep sea water oxygenation. Using multiple geochemical proxies we documented high-frequency changes in oxygenation of sea water from sediments of the convolutus to linnaei (guerichi) biozones. Detailed comparison of graptolite diversity with those high-frequency oxygenation changes suggests that the long-term and step-wise Late Aeronian graptolite crisis was not significantly influenced by changes in oxygen level and thus it probably resulted by another causes. The collapse of global carbon cycle during the Late Aeronian probably only temporarily increased extinction rate of the long-term graptolite crisis and considerably decreased evenness of the uppermost Aeronian graptolite communities. The Aeronian graptolite mass extinction was thus primarily driven by other biotic and/or abiotic causes

Słowa kluczowe

EN

Aeronian; graptolite mass extinction; redox-sensitive trace elements; Barrandian area; Bohemian Massif

• Wydawca: Państwowy Instytut Geologiczny - Państwowy Instytut Badawczy
• Czasopismo: Geological Quarterly
• Rocznik: 2017
• Tom: Vol. 61, No. 1
• Strony: 91--98
• Opis fizyczny: Bibliogr. 49 poz., rys., wykr.

Twórcy

autor

Pašava J.

• Czech Geological Survey, Klárov 3/131, 11821 Prague 1, Czech Republic

autor

Frýda J.

• Czech Geological Survey, Klárov 3/131, 11821 Prague 1, Czech Republic
• Czech University of Life Sciences Prague, Faculty of Environmental Sciences, Kamýcká 129, Praha 6 - Suchdol, 165 21, Czech Republic

autor

Štorch P.

• Academy of Sciences of the Czech Republic, Institute of Geology, Rozvojová 135, Praha 6, 165 00, Czech Republic

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Uwagi

Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę.