Organic matter in an Ocean Continent Transitions of present-day magma-poor rifted margins: the examples of Iberia and Newfoundland
Abstract: Serpentinisation and concomitant reduction of CO2 to methane at modern hydrothermal vents has been observed to support methanotrophic biosystems at mid-ocean ridges. Exhumation of mantle within ocean regions and its subsequent serpentinisation is a common occurrence. It is possible that me...
Main Authors: | , , , , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2021
|
Subjects: | |
Online Access: | https://zenodo.org/record/4515471 https://doi.org/10.5281/zenodo.4515471 |
id |
ftzenodo:oai:zenodo.org:4515471 |
---|---|
record_format |
openpolar |
spelling |
ftzenodo:oai:zenodo.org:4515471 2023-06-06T11:56:41+02:00 Organic matter in an Ocean Continent Transitions of present-day magma-poor rifted margins: the examples of Iberia and Newfoundland Mateeva, Tsvetomila Wolff, George A. J. Kusznir, Nick J. Manatschal, Gianreto Holtvoeth, Jens 2021-02-07 https://zenodo.org/record/4515471 https://doi.org/10.5281/zenodo.4515471 eng eng doi:10.5281/zenodo.4515470 https://zenodo.org/record/4515471 https://doi.org/10.5281/zenodo.4515471 oai:zenodo.org:4515471 info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by/4.0/legalcode serpentinization Iberian margin Newfoundland margin GDGTs ODP methanotroph. Leg 210 leg 149 leg 170 info:eu-repo/semantics/article publication-article 2021 ftzenodo https://doi.org/10.5281/zenodo.451547110.5281/zenodo.4515470 2023-04-13T21:44:42Z Abstract: Serpentinisation and concomitant reduction of CO2 to methane at modern hydrothermal vents has been observed to support methanotrophic biosystems at mid-ocean ridges. Exhumation of mantle within ocean regions and its subsequent serpentinisation is a common occurrence. It is possible that methanotrophy is not restricted to hydrothermal vents systems alone and could be pervasive within serpentinised exhumed oceanic mantle. The ocean-continent transition (OCT) of magma-poor rifted continental margins provides an opportunity to investigate this. Serpentinite, intrusive magmatic rocks and overlying sediments collected as part of the Ocean Drilling Program (ODP) from the Iberian and Newfoundland margin, were analysed to find evidence of methanotrophic archaea related to the serpentinisation process. Samples from the OCT of Newfoundland (ODP Leg 210) contain n-alkanes, PAHs and isoprenoids (pristane, phytane) while those from the OCT of Iberian (ODP Legs 149 and 173) also contained detectable steranes and hopanes. However, the distribution and composition of hydrocarbons suggest that the OM may not be indigenous to the rocks. The only clear evidence of Archaea was provided from GDGTs (0 – 3), crenarchaeol and isomers from one sediment sample at the Iberian Margin and these were likely derived from overlying oceanic waters. Hydrocarbon fingerprinting using polar plots suggests that any organic compounds in the igneous and metamorphic rocks were probably introduced from the drilling mud. All data and raw files available on simple demand. Manuscript and data presented on a conference but never published except in a thesis. Article in Journal/Newspaper Newfoundland Zenodo |
institution |
Open Polar |
collection |
Zenodo |
op_collection_id |
ftzenodo |
language |
English |
topic |
serpentinization Iberian margin Newfoundland margin GDGTs ODP methanotroph. Leg 210 leg 149 leg 170 |
spellingShingle |
serpentinization Iberian margin Newfoundland margin GDGTs ODP methanotroph. Leg 210 leg 149 leg 170 Mateeva, Tsvetomila Wolff, George A. J. Kusznir, Nick J. Manatschal, Gianreto Holtvoeth, Jens Organic matter in an Ocean Continent Transitions of present-day magma-poor rifted margins: the examples of Iberia and Newfoundland |
topic_facet |
serpentinization Iberian margin Newfoundland margin GDGTs ODP methanotroph. Leg 210 leg 149 leg 170 |
description |
Abstract: Serpentinisation and concomitant reduction of CO2 to methane at modern hydrothermal vents has been observed to support methanotrophic biosystems at mid-ocean ridges. Exhumation of mantle within ocean regions and its subsequent serpentinisation is a common occurrence. It is possible that methanotrophy is not restricted to hydrothermal vents systems alone and could be pervasive within serpentinised exhumed oceanic mantle. The ocean-continent transition (OCT) of magma-poor rifted continental margins provides an opportunity to investigate this. Serpentinite, intrusive magmatic rocks and overlying sediments collected as part of the Ocean Drilling Program (ODP) from the Iberian and Newfoundland margin, were analysed to find evidence of methanotrophic archaea related to the serpentinisation process. Samples from the OCT of Newfoundland (ODP Leg 210) contain n-alkanes, PAHs and isoprenoids (pristane, phytane) while those from the OCT of Iberian (ODP Legs 149 and 173) also contained detectable steranes and hopanes. However, the distribution and composition of hydrocarbons suggest that the OM may not be indigenous to the rocks. The only clear evidence of Archaea was provided from GDGTs (0 – 3), crenarchaeol and isomers from one sediment sample at the Iberian Margin and these were likely derived from overlying oceanic waters. Hydrocarbon fingerprinting using polar plots suggests that any organic compounds in the igneous and metamorphic rocks were probably introduced from the drilling mud. All data and raw files available on simple demand. Manuscript and data presented on a conference but never published except in a thesis. |
format |
Article in Journal/Newspaper |
author |
Mateeva, Tsvetomila Wolff, George A. J. Kusznir, Nick J. Manatschal, Gianreto Holtvoeth, Jens |
author_facet |
Mateeva, Tsvetomila Wolff, George A. J. Kusznir, Nick J. Manatschal, Gianreto Holtvoeth, Jens |
author_sort |
Mateeva, Tsvetomila |
title |
Organic matter in an Ocean Continent Transitions of present-day magma-poor rifted margins: the examples of Iberia and Newfoundland |
title_short |
Organic matter in an Ocean Continent Transitions of present-day magma-poor rifted margins: the examples of Iberia and Newfoundland |
title_full |
Organic matter in an Ocean Continent Transitions of present-day magma-poor rifted margins: the examples of Iberia and Newfoundland |
title_fullStr |
Organic matter in an Ocean Continent Transitions of present-day magma-poor rifted margins: the examples of Iberia and Newfoundland |
title_full_unstemmed |
Organic matter in an Ocean Continent Transitions of present-day magma-poor rifted margins: the examples of Iberia and Newfoundland |
title_sort |
organic matter in an ocean continent transitions of present-day magma-poor rifted margins: the examples of iberia and newfoundland |
publishDate |
2021 |
url |
https://zenodo.org/record/4515471 https://doi.org/10.5281/zenodo.4515471 |
genre |
Newfoundland |
genre_facet |
Newfoundland |
op_relation |
doi:10.5281/zenodo.4515470 https://zenodo.org/record/4515471 https://doi.org/10.5281/zenodo.4515471 oai:zenodo.org:4515471 |
op_rights |
info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by/4.0/legalcode |
op_doi |
https://doi.org/10.5281/zenodo.451547110.5281/zenodo.4515470 |
_version_ |
1767964408947933184 |