New evidence for a mega-event in the Arctic Ocean: Itrax XRF-scanning of cores from the YMER-80, Arctic Ocean-96 and LOMROG-07 expeditions
During the ice breaker expeditions YMER-80, ARCTIC-96 and LOMROG-07 to the Arctic Ocean several piston and gravity cores were collected. In some of the cores from the Central part of the Lomonosov Ridge a conspicuous, thick, gray homogeneous layer was observed. The color, position and physical prope...
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Department of Geology and Geochemistry, Stockholm University
2009
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Online Access: | https://epic.awi.de/id/eprint/41328/ https://epic.awi.de/id/eprint/41328/1/Mellquist_2009_Thesis.pdf https://hdl.handle.net/10013/epic.48233 https://hdl.handle.net/10013/epic.48233.d001 |
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ftawi:oai:epic.awi.de:41328 2023-05-15T14:23:01+02:00 New evidence for a mega-event in the Arctic Ocean: Itrax XRF-scanning of cores from the YMER-80, Arctic Ocean-96 and LOMROG-07 expeditions Mellquist, Matteo 2009 application/pdf https://epic.awi.de/id/eprint/41328/ https://epic.awi.de/id/eprint/41328/1/Mellquist_2009_Thesis.pdf https://hdl.handle.net/10013/epic.48233 https://hdl.handle.net/10013/epic.48233.d001 unknown Department of Geology and Geochemistry, Stockholm University https://epic.awi.de/id/eprint/41328/1/Mellquist_2009_Thesis.pdf https://hdl.handle.net/10013/epic.48233.d001 Mellquist, M. (2009) New evidence for a mega-event in the Arctic Ocean: Itrax XRF-scanning of cores from the YMER-80, Arctic Ocean-96 and LOMROG-07 expeditions , Stockholm, Department of Geology and Geochemistry, Stockholm University . hdl:10013/epic.48233 EPIC3Stockholm, Department of Geology and Geochemistry, Stockholm University PANGAEA Documentation notRev 2009 ftawi 2021-12-24T15:41:43Z During the ice breaker expeditions YMER-80, ARCTIC-96 and LOMROG-07 to the Arctic Ocean several piston and gravity cores were collected. In some of the cores from the Central part of the Lomonosov Ridge a conspicuous, thick, gray homogeneous layer was observed. The color, position and physical properties of this layer make this segment to a significant break in the otherwise yellowish and brown stratigraphy. The formation of this gray feature is here hypothesized to have been caused by an early-middle Weichselian outburst from one of the huge ice-dammed lakes that formed in West Siberia when the Barents-Kara ice-sheet expanded onto mainland Russia. Using the new X-ray fluorescence (XRF) scanner at Stockholm University, the gray layer could be shown to be characterized by a significant chemical-signature including distinct peaks or minima in Ti, Fe, Ca, as well as a minimum in the redox sensitive element Mn. Out of 38 investigated cores from these tree expeditions, 24 contain a gray unit in the upper 2 m. These 24 cores were taken from the Siberian-, the Central- and the Greenland side of the Lomonosov Ridge as well as from the Gakkel Ridge, the Morris Jesup and the Fram Strait. The presence of the gray layer in these areas thereby gives a prediction of a gray layer in the whole Eurasian Basin. Radiographic images produced on two cores containing the gray layer show a homogeneous, IRD-rich layer with no bioturbation and with a very sharp base boundary. Just below the gray layer in one of the cores an escape trace was observed, indicating a very rapid onset of the deposition of the gray layer. The extension of this layer together with redox conditions, the escape trace, a sharp base boundary and the grain size of this layer suggest an abrupt deposition resulting in oxygen free condition in the pore waters. Most likely this event was caused by an outburst of an ice-dammed lake. Other/Unknown Material Arctic Arctic Arctic Ocean Fram Strait Greenland Ice Sheet Lomonosov Ridge Siberia Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Arctic Arctic Ocean Breaker ENVELOPE(-67.257,-67.257,-67.874,-67.874) Dammed Lake ENVELOPE(-68.258,-68.258,68.496,68.496) Gakkel Ridge ENVELOPE(90.000,90.000,87.000,87.000) Greenland |
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Open Polar |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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ftawi |
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description |
During the ice breaker expeditions YMER-80, ARCTIC-96 and LOMROG-07 to the Arctic Ocean several piston and gravity cores were collected. In some of the cores from the Central part of the Lomonosov Ridge a conspicuous, thick, gray homogeneous layer was observed. The color, position and physical properties of this layer make this segment to a significant break in the otherwise yellowish and brown stratigraphy. The formation of this gray feature is here hypothesized to have been caused by an early-middle Weichselian outburst from one of the huge ice-dammed lakes that formed in West Siberia when the Barents-Kara ice-sheet expanded onto mainland Russia. Using the new X-ray fluorescence (XRF) scanner at Stockholm University, the gray layer could be shown to be characterized by a significant chemical-signature including distinct peaks or minima in Ti, Fe, Ca, as well as a minimum in the redox sensitive element Mn. Out of 38 investigated cores from these tree expeditions, 24 contain a gray unit in the upper 2 m. These 24 cores were taken from the Siberian-, the Central- and the Greenland side of the Lomonosov Ridge as well as from the Gakkel Ridge, the Morris Jesup and the Fram Strait. The presence of the gray layer in these areas thereby gives a prediction of a gray layer in the whole Eurasian Basin. Radiographic images produced on two cores containing the gray layer show a homogeneous, IRD-rich layer with no bioturbation and with a very sharp base boundary. Just below the gray layer in one of the cores an escape trace was observed, indicating a very rapid onset of the deposition of the gray layer. The extension of this layer together with redox conditions, the escape trace, a sharp base boundary and the grain size of this layer suggest an abrupt deposition resulting in oxygen free condition in the pore waters. Most likely this event was caused by an outburst of an ice-dammed lake. |
format |
Other/Unknown Material |
author |
Mellquist, Matteo |
spellingShingle |
Mellquist, Matteo New evidence for a mega-event in the Arctic Ocean: Itrax XRF-scanning of cores from the YMER-80, Arctic Ocean-96 and LOMROG-07 expeditions |
author_facet |
Mellquist, Matteo |
author_sort |
Mellquist, Matteo |
title |
New evidence for a mega-event in the Arctic Ocean: Itrax XRF-scanning of cores from the YMER-80, Arctic Ocean-96 and LOMROG-07 expeditions |
title_short |
New evidence for a mega-event in the Arctic Ocean: Itrax XRF-scanning of cores from the YMER-80, Arctic Ocean-96 and LOMROG-07 expeditions |
title_full |
New evidence for a mega-event in the Arctic Ocean: Itrax XRF-scanning of cores from the YMER-80, Arctic Ocean-96 and LOMROG-07 expeditions |
title_fullStr |
New evidence for a mega-event in the Arctic Ocean: Itrax XRF-scanning of cores from the YMER-80, Arctic Ocean-96 and LOMROG-07 expeditions |
title_full_unstemmed |
New evidence for a mega-event in the Arctic Ocean: Itrax XRF-scanning of cores from the YMER-80, Arctic Ocean-96 and LOMROG-07 expeditions |
title_sort |
new evidence for a mega-event in the arctic ocean: itrax xrf-scanning of cores from the ymer-80, arctic ocean-96 and lomrog-07 expeditions |
publisher |
Department of Geology and Geochemistry, Stockholm University |
publishDate |
2009 |
url |
https://epic.awi.de/id/eprint/41328/ https://epic.awi.de/id/eprint/41328/1/Mellquist_2009_Thesis.pdf https://hdl.handle.net/10013/epic.48233 https://hdl.handle.net/10013/epic.48233.d001 |
long_lat |
ENVELOPE(-67.257,-67.257,-67.874,-67.874) ENVELOPE(-68.258,-68.258,68.496,68.496) ENVELOPE(90.000,90.000,87.000,87.000) |
geographic |
Arctic Arctic Ocean Breaker Dammed Lake Gakkel Ridge Greenland |
geographic_facet |
Arctic Arctic Ocean Breaker Dammed Lake Gakkel Ridge Greenland |
genre |
Arctic Arctic Arctic Ocean Fram Strait Greenland Ice Sheet Lomonosov Ridge Siberia |
genre_facet |
Arctic Arctic Arctic Ocean Fram Strait Greenland Ice Sheet Lomonosov Ridge Siberia |
op_source |
EPIC3Stockholm, Department of Geology and Geochemistry, Stockholm University |
op_relation |
https://epic.awi.de/id/eprint/41328/1/Mellquist_2009_Thesis.pdf https://hdl.handle.net/10013/epic.48233.d001 Mellquist, M. (2009) New evidence for a mega-event in the Arctic Ocean: Itrax XRF-scanning of cores from the YMER-80, Arctic Ocean-96 and LOMROG-07 expeditions , Stockholm, Department of Geology and Geochemistry, Stockholm University . hdl:10013/epic.48233 |
_version_ |
1766295510755311616 |