Isotopic evidence for changes in the zinc cycle during Oceanic Anoxic Event 2 (Late Cretaceous)
Widespread deposition of organic-rich shales during the Late Cretaceous Oceanic Anoxic Event 2 (OAE 2, ca. 94 Ma) occurred during a period of significant global paleo-environmental and geochemical change. It has been proposed that an increase in nutrient input to the ocean during OAE 2 was the key m...
| Main Authors: | , , , , , , |
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| Format: | Journal article |
| Published: |
Geological Society of America
2018
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| _version_ | 1826263048506048512 |
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| author | Sweere, T Dickson, A Jenkyns, H Porcelli, D Elrick, M van den Boorn, S Henderson, G |
| author_facet | Sweere, T Dickson, A Jenkyns, H Porcelli, D Elrick, M van den Boorn, S Henderson, G |
| author_sort | Sweere, T |
| collection | OXFORD |
| description | Widespread deposition of organic-rich shales during the Late Cretaceous Oceanic Anoxic Event 2 (OAE 2, ca. 94 Ma) occurred during a period of significant global paleo-environmental and geochemical change. It has been proposed that an increase in nutrient input to the ocean during OAE 2 was the key mechanism that generated and sustained high rates of organic-matter burial over time scales of 103–105 yr. Zinc is a bio-essential micronutrient and the proportion of Zn burial in oxic sediments relative to burial in organic-rich continental margin sediments is reflected in its seawater isotope composition. The first Zn-isotope records dating from the Cretaceous are presented here from three coeval carbonate successions: two from Europe (southern England and southern Italy) and one from southern Mexico. The new data show reproducible stratigraphic Zn-isotope patterns in spatially and lithologically diverse carbonate successions. Excursions to lower Zn-isotope values may be linked to the input of magmatic Zn, changes in the proportion of Zn burial into organic-rich sediments, and the liberation of previously buried Zn during an episode of widespread seafloor re-oxygenation during OAE 2 (the Plenus Cold Event). |
| first_indexed | 2024-03-06T19:45:30Z |
| format | Journal article |
| id | oxford-uuid:22283c0a-a13a-44b8-a3da-adf52b447aca |
| institution | University of Oxford |
| last_indexed | 2024-03-06T19:45:30Z |
| publishDate | 2018 |
| publisher | Geological Society of America |
| record_format | dspace |
| spelling | oxford-uuid:22283c0a-a13a-44b8-a3da-adf52b447aca2022-03-26T11:37:11ZIsotopic evidence for changes in the zinc cycle during Oceanic Anoxic Event 2 (Late Cretaceous)Journal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:22283c0a-a13a-44b8-a3da-adf52b447acaSymplectic Elements at OxfordGeological Society of America2018Sweere, TDickson, AJenkyns, HPorcelli, DElrick, Mvan den Boorn, SHenderson, GWidespread deposition of organic-rich shales during the Late Cretaceous Oceanic Anoxic Event 2 (OAE 2, ca. 94 Ma) occurred during a period of significant global paleo-environmental and geochemical change. It has been proposed that an increase in nutrient input to the ocean during OAE 2 was the key mechanism that generated and sustained high rates of organic-matter burial over time scales of 103–105 yr. Zinc is a bio-essential micronutrient and the proportion of Zn burial in oxic sediments relative to burial in organic-rich continental margin sediments is reflected in its seawater isotope composition. The first Zn-isotope records dating from the Cretaceous are presented here from three coeval carbonate successions: two from Europe (southern England and southern Italy) and one from southern Mexico. The new data show reproducible stratigraphic Zn-isotope patterns in spatially and lithologically diverse carbonate successions. Excursions to lower Zn-isotope values may be linked to the input of magmatic Zn, changes in the proportion of Zn burial into organic-rich sediments, and the liberation of previously buried Zn during an episode of widespread seafloor re-oxygenation during OAE 2 (the Plenus Cold Event). |
| spellingShingle | Sweere, T Dickson, A Jenkyns, H Porcelli, D Elrick, M van den Boorn, S Henderson, G Isotopic evidence for changes in the zinc cycle during Oceanic Anoxic Event 2 (Late Cretaceous) |
| title | Isotopic evidence for changes in the zinc cycle during Oceanic Anoxic Event 2 (Late Cretaceous) |
| title_full | Isotopic evidence for changes in the zinc cycle during Oceanic Anoxic Event 2 (Late Cretaceous) |
| title_fullStr | Isotopic evidence for changes in the zinc cycle during Oceanic Anoxic Event 2 (Late Cretaceous) |
| title_full_unstemmed | Isotopic evidence for changes in the zinc cycle during Oceanic Anoxic Event 2 (Late Cretaceous) |
| title_short | Isotopic evidence for changes in the zinc cycle during Oceanic Anoxic Event 2 (Late Cretaceous) |
| title_sort | isotopic evidence for changes in the zinc cycle during oceanic anoxic event 2 late cretaceous |
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