Early and Middle Jurassic climate changes: implications for palaeoceanography and tectonics
The occurrence of ‘ice ages’ within the overall warm Jurassic Period has been the subject of much discussion and not a little controversy. Recently it has been suggested on the basis of occurrence of glendonites in circum-Arctic basins that cold episodes took place in the Jurassic (Price, 1999; Rogo...
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ftcopenhagenunip:oai:pure.atira.dk:publications/30182f4a-c7ba-4592-8af7-c4a6a6e29f94 2023-05-15T14:57:10+02:00 Early and Middle Jurassic climate changes: implications for palaeoceanography and tectonics Korte, Christoph Hesselbo, Stephen Ullmann, Clemens Vinzenz Ruhl, Micha Thibault, Nicolas Rudolph 2014 application/pdf https://curis.ku.dk/portal/da/publications/early-and-middle-jurassic-climate-changes-implications-for-palaeoceanography-and-tectonics(30182f4a-c7ba-4592-8af7-c4a6a6e29f94).html https://curis.ku.dk/ws/files/140580284/Korte.pdf eng eng info:eu-repo/semantics/openAccess Korte , C , Hesselbo , S , Ullmann , C V , Ruhl , M & Thibault , N R 2014 , ' Early and Middle Jurassic climate changes: implications for palaeoceanography and tectonics ' , Geophysical Research Abstracts , vol. 16 , 15944-1 . conferenceObject 2014 ftcopenhagenunip 2021-09-23T17:42:56Z The occurrence of ‘ice ages’ within the overall warm Jurassic Period has been the subject of much discussion and not a little controversy. Recently it has been suggested on the basis of occurrence of glendonites in circum-Arctic basins that cold episodes took place in the Jurassic (Price, 1999; Rogov and Zakharov, 2010). Here we present new high-resolution oxygen isotope datasets from marine calcitic fossils of different European basins that indicate strong temperature fluctuations during the Pliensbachian-Bajocian time span. The already reported cold Late Pliensbachian episode with at least three pronounced oxygen isotope ‘Ice Age’ cycles, and the subsequent well known Toarcian Oceanic Anoxic ‘supergreenhouse’ Event is followed by very warm seawater temperatures in the late Toarcian. Moreover, a very pronounced and effective cooling occurred during the latest Toarcian and early Aalenian (Early-Middle Jurassic Boundary Event) resulted in substantial expansion of Arctic climates to palaeolatitudes as low as 45° and in distinctly cooler seawater temperatures in lower latitude European seas. At least the extensive cooling at the Early-Middle Jurassic Boundary Event was most likely driven by substantial changes in oceanic current patterns which were initiated by a major tectonic uplift that prevented the transport of heat to Polar Regions. Conference Object Arctic University of Copenhagen: Research Arctic Zakharov ENVELOPE(130.617,130.617,64.650,64.650) |
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Open Polar |
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University of Copenhagen: Research |
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ftcopenhagenunip |
language |
English |
description |
The occurrence of ‘ice ages’ within the overall warm Jurassic Period has been the subject of much discussion and not a little controversy. Recently it has been suggested on the basis of occurrence of glendonites in circum-Arctic basins that cold episodes took place in the Jurassic (Price, 1999; Rogov and Zakharov, 2010). Here we present new high-resolution oxygen isotope datasets from marine calcitic fossils of different European basins that indicate strong temperature fluctuations during the Pliensbachian-Bajocian time span. The already reported cold Late Pliensbachian episode with at least three pronounced oxygen isotope ‘Ice Age’ cycles, and the subsequent well known Toarcian Oceanic Anoxic ‘supergreenhouse’ Event is followed by very warm seawater temperatures in the late Toarcian. Moreover, a very pronounced and effective cooling occurred during the latest Toarcian and early Aalenian (Early-Middle Jurassic Boundary Event) resulted in substantial expansion of Arctic climates to palaeolatitudes as low as 45° and in distinctly cooler seawater temperatures in lower latitude European seas. At least the extensive cooling at the Early-Middle Jurassic Boundary Event was most likely driven by substantial changes in oceanic current patterns which were initiated by a major tectonic uplift that prevented the transport of heat to Polar Regions. |
format |
Conference Object |
author |
Korte, Christoph Hesselbo, Stephen Ullmann, Clemens Vinzenz Ruhl, Micha Thibault, Nicolas Rudolph |
spellingShingle |
Korte, Christoph Hesselbo, Stephen Ullmann, Clemens Vinzenz Ruhl, Micha Thibault, Nicolas Rudolph Early and Middle Jurassic climate changes: implications for palaeoceanography and tectonics |
author_facet |
Korte, Christoph Hesselbo, Stephen Ullmann, Clemens Vinzenz Ruhl, Micha Thibault, Nicolas Rudolph |
author_sort |
Korte, Christoph |
title |
Early and Middle Jurassic climate changes: implications for palaeoceanography and tectonics |
title_short |
Early and Middle Jurassic climate changes: implications for palaeoceanography and tectonics |
title_full |
Early and Middle Jurassic climate changes: implications for palaeoceanography and tectonics |
title_fullStr |
Early and Middle Jurassic climate changes: implications for palaeoceanography and tectonics |
title_full_unstemmed |
Early and Middle Jurassic climate changes: implications for palaeoceanography and tectonics |
title_sort |
early and middle jurassic climate changes: implications for palaeoceanography and tectonics |
publishDate |
2014 |
url |
https://curis.ku.dk/portal/da/publications/early-and-middle-jurassic-climate-changes-implications-for-palaeoceanography-and-tectonics(30182f4a-c7ba-4592-8af7-c4a6a6e29f94).html https://curis.ku.dk/ws/files/140580284/Korte.pdf |
long_lat |
ENVELOPE(130.617,130.617,64.650,64.650) |
geographic |
Arctic Zakharov |
geographic_facet |
Arctic Zakharov |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
Korte , C , Hesselbo , S , Ullmann , C V , Ruhl , M & Thibault , N R 2014 , ' Early and Middle Jurassic climate changes: implications for palaeoceanography and tectonics ' , Geophysical Research Abstracts , vol. 16 , 15944-1 . |
op_rights |
info:eu-repo/semantics/openAccess |
_version_ |
1766329265670848512 |