Onset of main Phanerozoic marine radiation sparked by emerging Mid Ordovician icehouse.

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Onset of main Phanerozoic marine radiation sparked by emerging Mid Ordovician icehouse. / Rasmussen, Christian; Ullmann, Clemens V; Jakobsen, Kristian G; Lindskog, Anders; Hansen, Jesper; Hansen, Thomas; Eriksson, Mats; Dronov, Andrei; Frei, Robert; Korte, Christoph; Nielsen, Arne T; Harper, David A T.

In: Scientific Reports, Vol. 6, 18884, 2016.

Research output: Contribution to journalArticle

Harvard

Rasmussen, C, Ullmann, CV, Jakobsen, KG, Lindskog, A, Hansen, J, Hansen, T, Eriksson, M, Dronov, A, Frei, R, Korte, C, Nielsen, AT & Harper, DAT 2016, 'Onset of main Phanerozoic marine radiation sparked by emerging Mid Ordovician icehouse.', Scientific Reports, vol. 6, 18884. https://doi.org/10.1038/srep18884

APA

Rasmussen, C., Ullmann, C. V., Jakobsen, K. G., Lindskog, A., Hansen, J., Hansen, T., ... Harper, D. A. T. (2016). Onset of main Phanerozoic marine radiation sparked by emerging Mid Ordovician icehouse. Scientific Reports, 6, [18884]. https://doi.org/10.1038/srep18884

CBE

Rasmussen C, Ullmann CV, Jakobsen KG, Lindskog A, Hansen J, Hansen T, Eriksson M, Dronov A, Frei R, Korte C, Nielsen AT, Harper DAT. 2016. Onset of main Phanerozoic marine radiation sparked by emerging Mid Ordovician icehouse. Scientific Reports. 6. https://doi.org/10.1038/srep18884

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Author

Rasmussen, Christian ; Ullmann, Clemens V ; Jakobsen, Kristian G ; Lindskog, Anders ; Hansen, Jesper ; Hansen, Thomas ; Eriksson, Mats ; Dronov, Andrei ; Frei, Robert ; Korte, Christoph ; Nielsen, Arne T ; Harper, David A T. / Onset of main Phanerozoic marine radiation sparked by emerging Mid Ordovician icehouse. In: Scientific Reports. 2016 ; Vol. 6.

RIS

TY - JOUR

T1 - Onset of main Phanerozoic marine radiation sparked by emerging Mid Ordovician icehouse.

AU - Rasmussen, Christian

AU - Ullmann, Clemens V

AU - Jakobsen, Kristian G

AU - Lindskog, Anders

AU - Hansen, Jesper

AU - Hansen, Thomas

AU - Eriksson, Mats

AU - Dronov, Andrei

AU - Frei, Robert

AU - Korte, Christoph

AU - Nielsen, Arne T

AU - Harper, David A T

PY - 2016

Y1 - 2016

N2 - The Great Ordovician Biodiversification Event (GOBE) was the most rapid and sustained increase in marine Phanerozoic biodiversity. What generated this biotic response across Palaeozoic seascapes is a matter of debate; several intrinsic and extrinsic drivers have been suggested. One is Ordovician climate, which in recent years has undergone a paradigm shift from a text-book example of an extended greenhouse to an interval with transient cooling intervals - at least during the Late Ordovician. Here, we show the first unambiguous evidence for a sudden Mid Ordovician icehouse, comparable in magnitude to the Quaternary glaciations. We further demonstrate the initiation of this icehouse to coincide with the onset of the GOBE. This finding is based on both abiotic and biotic proxies obtained from the most comprehensive geochemical and palaeobiological dataset yet collected through this interval. We argue that the icehouse conditions increased latitudinal and bathymetrical temperature and oxygen gradients initiating an Early Palaeozoic Great Ocean Conveyor Belt. This fuelled the GOBE, as upwelling zones created new ecospace for the primary producers. A subsequent rise in δ(13)C ratios known as the Middle Darriwilian Isotopic Carbon Excursion (MDICE) may reflect a global response to increased bioproductivity encouraged by the onset of the GOBE.

AB - The Great Ordovician Biodiversification Event (GOBE) was the most rapid and sustained increase in marine Phanerozoic biodiversity. What generated this biotic response across Palaeozoic seascapes is a matter of debate; several intrinsic and extrinsic drivers have been suggested. One is Ordovician climate, which in recent years has undergone a paradigm shift from a text-book example of an extended greenhouse to an interval with transient cooling intervals - at least during the Late Ordovician. Here, we show the first unambiguous evidence for a sudden Mid Ordovician icehouse, comparable in magnitude to the Quaternary glaciations. We further demonstrate the initiation of this icehouse to coincide with the onset of the GOBE. This finding is based on both abiotic and biotic proxies obtained from the most comprehensive geochemical and palaeobiological dataset yet collected through this interval. We argue that the icehouse conditions increased latitudinal and bathymetrical temperature and oxygen gradients initiating an Early Palaeozoic Great Ocean Conveyor Belt. This fuelled the GOBE, as upwelling zones created new ecospace for the primary producers. A subsequent rise in δ(13)C ratios known as the Middle Darriwilian Isotopic Carbon Excursion (MDICE) may reflect a global response to increased bioproductivity encouraged by the onset of the GOBE.

U2 - 10.1038/srep18884

DO - 10.1038/srep18884

M3 - Article

VL - 6

JO - Scientific Reports

T2 - Scientific Reports

JF - Scientific Reports

SN - 2045-2322

M1 - 18884

ER -