Middle to Late Jurassic palaeoclimatic and palaeoceanographic trends in the Euro-Boreal region: Geochemical insights from East Greenland belemnites
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During the Middle and Late Jurassic, Europe and the Boreal regions formed a network of semi-restricted, relatively shallow marine basins. Consequently, stable oxygen (δ18O) and carbon (δ13C) isotope records from belemnites were strongly influenced by changes in palaeoceanography and climate. New data from eastern Greenland, which formed the western margin of the critical Viking Corridor (the narrow seaway that linked the Tethys to the Boreal realm), and compiled data from the Subboreal Province and Tethys Realms are examined together. In both territories, increases in δ18Obel across the Lower and Middle Jurassic boundary indicate that cooling occurred, although this appears to be temporally offset and of variable magnitude across the western Subboreal Province and Tethys Realm. This suggests that changes in ocean current patterns played a major role in governing the δ18Obel signal. The Middle to Upper Jurassic transition is characterised by relatively heavy δ18Obel values in the Subboreal Province, but is less pronounced in the northwest Tethys, suggesting that this trend may have been caused by a strengthening of a southward current bringing colder Boreal waters southwards. The uppermost Jurassic shows increases in both δ18Obel and δ13Cbel, consistent with the observed VOICE event as recorded in Boreal terrestrial organic matter δ13C, and supporting this evidence that the Boreal realm become isolated from the lower latitudes across the Jurassic – Cretaceous boundary.
| Originalsprog | Engelsk |
|---|---|
| Artikelnummer | 111014 |
| Tidsskrift | Palaeogeography, Palaeoclimatology, Palaeoecology |
| Vol/bind | 597 |
| Antal sider | 13 |
| ISSN | 0031-0182 |
| DOI | |
| Status | Udgivet - 2022 |
Bibliografisk note
Funding Information:
We thank Michael Engkilde for access to his belemnite collection. These belemnites were primarily collected by M. Engkilde and J. Callomon in field seasons 1992-1994 and 1995-1998 on Jameson Land. The belemnites were collected from layers along with co-existing ammonites, which were subsequently determined by J. Callomon. A few belemnites, age-determined by co-existing ammonites, were collected by F. Surlyk, G. Dam, M. Larsen, H. Vosgerau, who all participated in the integrated field work in East Greenland in the 1990s. Other belemnites come from the Geological Museum of Denmarks's collection (M. Engkilde and J. Callomon). We acknowledge Bo Petersen for stable-isotope measurements and Jesper A. Frederiksen for preparing sample material for isotope analysis. The Danish Council for Independent Research?Natural Sciences (project DFF - 7014-00142 to CK) is acknowledged for funding this project. Funding for this study was also granted by the European Commission, Horizon 2020 Marie Sk?odowska-Curie Actions (ICECAP; grant no. 101024218, to MLV), and by the Research Council of Norway through the Centres of Excellence funding scheme, project number 223272. MEJ acknowledges the Danish Offshore Technology Centre (DTU Offshore for financially supporting his postdoctoral research during which this work was partly carried out. We thank our reviewers, Stephane Bodin and an anonymous, for their constructive reviews.
Funding Information:
We thank Michael Engkilde for access to his belemnite collection. These belemnites were primarily collected by M. Engkilde and J. Callomon in field seasons 1992-1994 and 1995-1998 on Jameson Land. The belemnites were collected from layers along with co-existing ammonites, which were subsequently determined by J. Callomon. A few belemnites, age-determined by co-existing ammonites, were collected by F. Surlyk, G. Dam, M. Larsen, H. Vosgerau, who all participated in the integrated field work in East Greenland in the 1990s. Other belemnites come from the Geological Museum of Denmarks's collection (M. Engkilde and J. Callomon). We acknowledge Bo Petersen for stable-isotope measurements and Jesper A. Frederiksen for preparing sample material for isotope analysis. The Danish Council for Independent Research–Natural Sciences (project DFF - 7014-00142 to CK) is acknowledged for funding this project. Funding for this study was also granted by the European Commission, Horizon 2020 Marie Skłodowska-Curie Actions (ICECAP; grant no. 101024218 , to MLV), and by the Research Council of Norway through the Centres of Excellence funding scheme, project number 223272 . MEJ acknowledges the Danish Offshore Technology Centre (DTU Offshore for financially supporting his postdoctoral research during which this work was partly carried out. We thank our reviewers, Stephane Bodin and an anonymous, for their constructive reviews.
Publisher Copyright:
© 2022 The Author(s)
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