Mercury anomalies across the Palaeocene-Eocene Thermal Maximum
Large-scale magmatic events like the emplacement of the North Atlantic Igneous Province (NAIP) are often coincident with periods of extreme climate change such as the Palaeocene-Eocene Thermal Maximum (PETM). One proxy for volcanism in the geological record that is receiving increased attention is t...
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ftunivutrecht:oai:dspace.library.uu.nl:1874/379675 2023-11-12T04:14:04+01:00 Mercury anomalies across the Palaeocene-Eocene Thermal Maximum Jones, Morgan T. Percival, Lawrence M.E. Stokke, Ella W. Frieling, Joost Mather, Tamsin A. Riber, Lars Schubert, Brian A. Schultz, Bo Tegner, Christian Planke, Sverre Svensen, Henrik H. Marine palynology and palaeoceanography Marine Palynology 2019-02-06 image/pdf https://dspace.library.uu.nl/handle/1874/379675 en eng 1814-9324 https://dspace.library.uu.nl/handle/1874/379675 info:eu-repo/semantics/OpenAccess Global and Planetary Change Stratigraphy Palaeontology Article 2019 ftunivutrecht 2023-11-01T23:20:33Z Large-scale magmatic events like the emplacement of the North Atlantic Igneous Province (NAIP) are often coincident with periods of extreme climate change such as the Palaeocene-Eocene Thermal Maximum (PETM). One proxy for volcanism in the geological record that is receiving increased attention is the use of mercury (Hg) anomalies. Volcanic eruptions are among the dominant natural sources of Hg to the environment; thus, elevated Hg=TOC values in the sedimentary rock record may reflect an increase in volcanic activity at the time of deposition. Here we focus on five continental shelf sections located around the NAIP in the Palaeogene. We measured Hg concentrations, total organic carbon (TOC) contents, and δ13C values to assess how Hg deposition fluctuated across the PETM carbon isotope excursion (CIE). We find a huge variation in Hg anomalies between sites. The Grane field in the North Sea, the most proximal locality to the NAIP analysed, shows Hg concentrations up to 90 100 ppb (Hg=TOC D 95 700 ppb wt %-1) in the early Eocene. Significant Hg=TOC anomalies are also present in Danish (up to 324 ppb wt %-1) and Svalbard (up to 257 ppb wt %-1) sections prior to the onset of the PETM and during the recovery period, while the Svalbard section also shows a continuous Hg=TOC anomaly during the body of the CIE. The combination with other tracers of volcanism, such as tephra layers and unradiogenic Os isotopes, at these localities suggests that the Hg=TOC anomalies reflect pulses of magmatic activity. In contrast, we do not observe clear Hg anomalies on the New Jersey shelf (Bass River) or the Arctic Ocean (Lomonosov Ridge). This large spatial variance could be due to more regional Hg deposition. One possibility is that phreatomagmatic eruptions and hydrothermal vent complexes formed during the emplacement of sills led to submarine Hg release, which is observed to result in limited distribution in the modern era. The Hg=TOC anomalies in strata deposited prior to the CIE may suggest that magmatism linked to the emplacement ... Article in Journal/Newspaper Arctic Arctic Ocean Climate change Lomonosov Ridge North Atlantic Svalbard Utrecht University Repository Arctic Arctic Ocean Grane ENVELOPE(13.385,13.385,65.539,65.539) Svalbard |
institution |
Open Polar |
collection |
Utrecht University Repository |
op_collection_id |
ftunivutrecht |
language |
English |
topic |
Global and Planetary Change Stratigraphy Palaeontology |
spellingShingle |
Global and Planetary Change Stratigraphy Palaeontology Jones, Morgan T. Percival, Lawrence M.E. Stokke, Ella W. Frieling, Joost Mather, Tamsin A. Riber, Lars Schubert, Brian A. Schultz, Bo Tegner, Christian Planke, Sverre Svensen, Henrik H. Mercury anomalies across the Palaeocene-Eocene Thermal Maximum |
topic_facet |
Global and Planetary Change Stratigraphy Palaeontology |
description |
Large-scale magmatic events like the emplacement of the North Atlantic Igneous Province (NAIP) are often coincident with periods of extreme climate change such as the Palaeocene-Eocene Thermal Maximum (PETM). One proxy for volcanism in the geological record that is receiving increased attention is the use of mercury (Hg) anomalies. Volcanic eruptions are among the dominant natural sources of Hg to the environment; thus, elevated Hg=TOC values in the sedimentary rock record may reflect an increase in volcanic activity at the time of deposition. Here we focus on five continental shelf sections located around the NAIP in the Palaeogene. We measured Hg concentrations, total organic carbon (TOC) contents, and δ13C values to assess how Hg deposition fluctuated across the PETM carbon isotope excursion (CIE). We find a huge variation in Hg anomalies between sites. The Grane field in the North Sea, the most proximal locality to the NAIP analysed, shows Hg concentrations up to 90 100 ppb (Hg=TOC D 95 700 ppb wt %-1) in the early Eocene. Significant Hg=TOC anomalies are also present in Danish (up to 324 ppb wt %-1) and Svalbard (up to 257 ppb wt %-1) sections prior to the onset of the PETM and during the recovery period, while the Svalbard section also shows a continuous Hg=TOC anomaly during the body of the CIE. The combination with other tracers of volcanism, such as tephra layers and unradiogenic Os isotopes, at these localities suggests that the Hg=TOC anomalies reflect pulses of magmatic activity. In contrast, we do not observe clear Hg anomalies on the New Jersey shelf (Bass River) or the Arctic Ocean (Lomonosov Ridge). This large spatial variance could be due to more regional Hg deposition. One possibility is that phreatomagmatic eruptions and hydrothermal vent complexes formed during the emplacement of sills led to submarine Hg release, which is observed to result in limited distribution in the modern era. The Hg=TOC anomalies in strata deposited prior to the CIE may suggest that magmatism linked to the emplacement ... |
author2 |
Marine palynology and palaeoceanography Marine Palynology |
format |
Article in Journal/Newspaper |
author |
Jones, Morgan T. Percival, Lawrence M.E. Stokke, Ella W. Frieling, Joost Mather, Tamsin A. Riber, Lars Schubert, Brian A. Schultz, Bo Tegner, Christian Planke, Sverre Svensen, Henrik H. |
author_facet |
Jones, Morgan T. Percival, Lawrence M.E. Stokke, Ella W. Frieling, Joost Mather, Tamsin A. Riber, Lars Schubert, Brian A. Schultz, Bo Tegner, Christian Planke, Sverre Svensen, Henrik H. |
author_sort |
Jones, Morgan T. |
title |
Mercury anomalies across the Palaeocene-Eocene Thermal Maximum |
title_short |
Mercury anomalies across the Palaeocene-Eocene Thermal Maximum |
title_full |
Mercury anomalies across the Palaeocene-Eocene Thermal Maximum |
title_fullStr |
Mercury anomalies across the Palaeocene-Eocene Thermal Maximum |
title_full_unstemmed |
Mercury anomalies across the Palaeocene-Eocene Thermal Maximum |
title_sort |
mercury anomalies across the palaeocene-eocene thermal maximum |
publishDate |
2019 |
url |
https://dspace.library.uu.nl/handle/1874/379675 |
long_lat |
ENVELOPE(13.385,13.385,65.539,65.539) |
geographic |
Arctic Arctic Ocean Grane Svalbard |
geographic_facet |
Arctic Arctic Ocean Grane Svalbard |
genre |
Arctic Arctic Ocean Climate change Lomonosov Ridge North Atlantic Svalbard |
genre_facet |
Arctic Arctic Ocean Climate change Lomonosov Ridge North Atlantic Svalbard |
op_relation |
1814-9324 https://dspace.library.uu.nl/handle/1874/379675 |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1782331789901037568 |