SMOLAREK, JUSTYNA, TRELA, WIESŁAW, BOND, DAVID P. G., MARYNOWSKI, LESZEK (2017) Lower Wenlock black shales in the northern Holy Cross Mountains, Poland: sedimentary and geochemical controls on the Ireviken Event in a deep marine setting. Geological Magazine, 154 (2) 247-264 doi:10.1017/s0016756815001065
| Reference Type | Journal (article/letter/editorial) | ||
|---|---|---|---|
| Title | Lower Wenlock black shales in the northern Holy Cross Mountains, Poland: sedimentary and geochemical controls on the Ireviken Event in a deep marine setting | ||
| Journal | Geological Magazine | ||
| Authors | SMOLAREK, JUSTYNA | Author | |
| TRELA, WIESŁAW | Author | ||
| BOND, DAVID P. G. | Author | ||
| MARYNOWSKI, LESZEK | Author | ||
| Year | 2017 (March) | Volume | 154 |
| Issue | 2 | ||
| Publisher | Cambridge University Press (CUP) | ||
| DOI | doi:10.1017/s0016756815001065Search in ResearchGate | ||
| Generate Citation Formats | |||
| Mindat Ref. ID | 261111 | Long-form Identifier | mindat:1:5:261111:6 |
| GUID | 0 | ||
| Full Reference | SMOLAREK, JUSTYNA, TRELA, WIESŁAW, BOND, DAVID P. G., MARYNOWSKI, LESZEK (2017) Lower Wenlock black shales in the northern Holy Cross Mountains, Poland: sedimentary and geochemical controls on the Ireviken Event in a deep marine setting. Geological Magazine, 154 (2) 247-264 doi:10.1017/s0016756815001065 | ||
| Plain Text | SMOLAREK, JUSTYNA, TRELA, WIESŁAW, BOND, DAVID P. G., MARYNOWSKI, LESZEK (2017) Lower Wenlock black shales in the northern Holy Cross Mountains, Poland: sedimentary and geochemical controls on the Ireviken Event in a deep marine setting. Geological Magazine, 154 (2) 247-264 doi:10.1017/s0016756815001065 | ||
| In | (2017, March) Geological Magazine Vol. 154 (2) Cambridge University Press (CUP) | ||
| Abstract/Notes | AbstractThe stratigraphic variability and geochemistry of Llandovery/Wenlock (L/W) Series boundary sediments in Poland reveals that hemipelagic sedimentation under an anoxic/euxinic water column was interrupted by low-density bottom currents or detached diluted turbid layers that resulted in intermittent seafloor oxygenation. Total organic carbon values and inorganic proxies throughout the Wilków 1 borehole section suggest variable redox conditions. U/Mo ratios > 1 throughout much of the Aeronian and Telychian stages, together with an absence of pyrite framboids, suggest oxygenated conditions prevailed. However, elevated total organic carbon near the Aeronian/Telychian boundary, together with increased U/Th and V/(V + Ni) ratios and populations of small pyrite framboids are consistent with the development of dysoxic/anoxic conditions at that time. U/Th, V/Cr and V/(V + Ni) ratios, as well as Uauthig and Mo concentrations, suggest that during the Ireviken black shale deposition, bottom-water conditions deteriorated from oxic during Telychian time to mostly suboxic/anoxic immediately prior to the L/W boundary, before a brief reoxygenation at the end of the Ireviken black shale sedimentation in the Sheinwoodian Stage. Rapid fluctuations in U/Mo during the Ireviken Event are characteristic of fluctuating redox conditions that culminated in an anoxic/euxinic seafloor in Sheinwoodian time. Following Ireviken black shale deposition, conditions once again became oxygen deficient with the development of a euxinic zone in the water column. The Aeronian to Sheinwoodian deep-water redox history was unstable, and rapid fluctuations of the chemocline across the L/W Series boundary probably contributed to the Ireviken Event extinctions, which affected mainly pelagic and hemipelagic fauna. | ||
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