Iron isotope and trace metal record of Cenomanian-Turonian sediments
he global carbon cycle during the mid-Cretaceous (~125-88 million years ago, Ma) experienced numerous major perturbations linked to increased organic carbon burial under widespread, possibly basin-scale oxygen deficiency and episodes of euxinia (anoxic and H2S-containing). The largest of these episo...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.824952 2024-09-15T18:23:13+00:00 Iron isotope and trace metal record of Cenomanian-Turonian sediments Owens, Jeremy D Lyons, Timothy W Li, Xiaona N MacLeod, Kenneth G Gordon, Gwenyth Kuypers, Marcel MM Anbar, Ariel D Kuhnt, Wolfgang Severmann, Silke MEDIAN LATITUDE: 25.780904 * MEDIAN LONGITUDE: -38.643131 * SOUTH-BOUND LATITUDE: 9.433330 * WEST-BOUND LONGITUDE: -70.028500 * NORTH-BOUND LATITUDE: 50.700000 * EAST-BOUND LONGITUDE: 0.300000 * DATE/TIME START: 1970-05-13T00:00:00 * DATE/TIME END: 2003-01-25T10:10:00 2012 application/zip, 7 datasets https://doi.pangaea.de/10.1594/PANGAEA.824952 https://doi.org/10.1594/PANGAEA.824952 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.824952 https://doi.org/10.1594/PANGAEA.824952 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess Supplement to: Owens, Jeremy D; Lyons, Timothy W; Li, Xiaona N; MacLeod, Kenneth G; Gordon, Gwenyth; Kuypers, Marcel MM; Anbar, Ariel D; Kuhnt, Wolfgang; Severmann, Silke (2012): Iron isotope and trace metal records of iron cycling in the proto-North Atlantic during the Cenomanian-Turonian oceanic anoxic event (OAE-2). Paleoceanography, 27(3), PA3223, https://doi.org/10.1029/2012PA002328 Deep Sea Drilling Project DSDP Ocean Drilling Program ODP dataset publication series 2012 ftpangaea https://doi.org/10.1594/PANGAEA.82495210.1029/2012PA002328 2024-07-24T02:31:21Z he global carbon cycle during the mid-Cretaceous (~125-88 million years ago, Ma) experienced numerous major perturbations linked to increased organic carbon burial under widespread, possibly basin-scale oxygen deficiency and episodes of euxinia (anoxic and H2S-containing). The largest of these episodes, the Cenomanian-Turonian boundary event (ca. 93.5 Ma), or oceanic anoxic event (OAE) 2, was marked by pervasive deposition of organic-rich, laminated black shales in deep waters and in some cases across continental shelves. This deposition is recorded in a pronounced positive carbon isotope excursion seen ubiquitously in carbonates and organic matter. Enrichments of redox-sensitive, often bioessential trace metals, including Fe and Mo, indicate major shifts in their biogeochemical cycles under reducing conditions that may be linked to changes in primary production. Iron enrichments and bulk Fe isotope compositions track the sources and sinks of Fe in the proto-North Atlantic at seven localities marked by diverse depositional conditions. Included are an ancestral mid-ocean ridge and euxinic, intermittently euxinic, and oxic settings across varying paleodepths throughout the basin. These data yield evidence for a reactive Fe shuttle that likely delivered Fe from the shallow shelf to the deep ocean basin, as well as (1) hydrothermal sources enhanced by accelerated seafloor spreading or emplacement of large igneous province(s) and (2) local-scale Fe remobilization within the sediment column. This study, the first to explore Fe cycling and enrichment patterns on an ocean scale using iron isotope data, demonstrates the complex processes operating on this scale that can mask simple source-sink relationships. The data imply that the proto-North Atlantic received elevated Fe inputs from several sources (e.g., hydrothermal, shuttle and detrital inputs) and that the redox state of the basin was not exclusively euxinic, suggesting previously unknown heterogeneity in depositional conditions and biogeochemical cycling within ... Other/Unknown Material North Atlantic PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(-70.028500,0.300000,50.700000,9.433330) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
Deep Sea Drilling Project DSDP Ocean Drilling Program ODP |
spellingShingle |
Deep Sea Drilling Project DSDP Ocean Drilling Program ODP Owens, Jeremy D Lyons, Timothy W Li, Xiaona N MacLeod, Kenneth G Gordon, Gwenyth Kuypers, Marcel MM Anbar, Ariel D Kuhnt, Wolfgang Severmann, Silke Iron isotope and trace metal record of Cenomanian-Turonian sediments |
topic_facet |
Deep Sea Drilling Project DSDP Ocean Drilling Program ODP |
description |
he global carbon cycle during the mid-Cretaceous (~125-88 million years ago, Ma) experienced numerous major perturbations linked to increased organic carbon burial under widespread, possibly basin-scale oxygen deficiency and episodes of euxinia (anoxic and H2S-containing). The largest of these episodes, the Cenomanian-Turonian boundary event (ca. 93.5 Ma), or oceanic anoxic event (OAE) 2, was marked by pervasive deposition of organic-rich, laminated black shales in deep waters and in some cases across continental shelves. This deposition is recorded in a pronounced positive carbon isotope excursion seen ubiquitously in carbonates and organic matter. Enrichments of redox-sensitive, often bioessential trace metals, including Fe and Mo, indicate major shifts in their biogeochemical cycles under reducing conditions that may be linked to changes in primary production. Iron enrichments and bulk Fe isotope compositions track the sources and sinks of Fe in the proto-North Atlantic at seven localities marked by diverse depositional conditions. Included are an ancestral mid-ocean ridge and euxinic, intermittently euxinic, and oxic settings across varying paleodepths throughout the basin. These data yield evidence for a reactive Fe shuttle that likely delivered Fe from the shallow shelf to the deep ocean basin, as well as (1) hydrothermal sources enhanced by accelerated seafloor spreading or emplacement of large igneous province(s) and (2) local-scale Fe remobilization within the sediment column. This study, the first to explore Fe cycling and enrichment patterns on an ocean scale using iron isotope data, demonstrates the complex processes operating on this scale that can mask simple source-sink relationships. The data imply that the proto-North Atlantic received elevated Fe inputs from several sources (e.g., hydrothermal, shuttle and detrital inputs) and that the redox state of the basin was not exclusively euxinic, suggesting previously unknown heterogeneity in depositional conditions and biogeochemical cycling within ... |
format |
Other/Unknown Material |
author |
Owens, Jeremy D Lyons, Timothy W Li, Xiaona N MacLeod, Kenneth G Gordon, Gwenyth Kuypers, Marcel MM Anbar, Ariel D Kuhnt, Wolfgang Severmann, Silke |
author_facet |
Owens, Jeremy D Lyons, Timothy W Li, Xiaona N MacLeod, Kenneth G Gordon, Gwenyth Kuypers, Marcel MM Anbar, Ariel D Kuhnt, Wolfgang Severmann, Silke |
author_sort |
Owens, Jeremy D |
title |
Iron isotope and trace metal record of Cenomanian-Turonian sediments |
title_short |
Iron isotope and trace metal record of Cenomanian-Turonian sediments |
title_full |
Iron isotope and trace metal record of Cenomanian-Turonian sediments |
title_fullStr |
Iron isotope and trace metal record of Cenomanian-Turonian sediments |
title_full_unstemmed |
Iron isotope and trace metal record of Cenomanian-Turonian sediments |
title_sort |
iron isotope and trace metal record of cenomanian-turonian sediments |
publisher |
PANGAEA |
publishDate |
2012 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.824952 https://doi.org/10.1594/PANGAEA.824952 |
op_coverage |
MEDIAN LATITUDE: 25.780904 * MEDIAN LONGITUDE: -38.643131 * SOUTH-BOUND LATITUDE: 9.433330 * WEST-BOUND LONGITUDE: -70.028500 * NORTH-BOUND LATITUDE: 50.700000 * EAST-BOUND LONGITUDE: 0.300000 * DATE/TIME START: 1970-05-13T00:00:00 * DATE/TIME END: 2003-01-25T10:10:00 |
long_lat |
ENVELOPE(-70.028500,0.300000,50.700000,9.433330) |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Supplement to: Owens, Jeremy D; Lyons, Timothy W; Li, Xiaona N; MacLeod, Kenneth G; Gordon, Gwenyth; Kuypers, Marcel MM; Anbar, Ariel D; Kuhnt, Wolfgang; Severmann, Silke (2012): Iron isotope and trace metal records of iron cycling in the proto-North Atlantic during the Cenomanian-Turonian oceanic anoxic event (OAE-2). Paleoceanography, 27(3), PA3223, https://doi.org/10.1029/2012PA002328 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.824952 https://doi.org/10.1594/PANGAEA.824952 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1594/PANGAEA.82495210.1029/2012PA002328 |
_version_ |
1810463393675476992 |