Disentangling Diagenesis From the Rock Record: An Example From the Permo-Triassic Wordie Creek Formation, East Greenland
<jats:title>Abstract</jats:title><jats:p>The measurement of isotope ratios in sedimentary rocks deposited over geological time can provide key insights to past environmental change over important intervals in the past. However, it is important to be aware that secondary alteration...
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ftunivcam:oai:www.repository.cam.ac.uk:1810/273880 2024-01-14T10:06:30+01:00 Disentangling Diagenesis From the Rock Record: An Example From the Permo-Triassic Wordie Creek Formation, East Greenland Roberts, J Turchyn, AV Wignall, PB Newton, RJ Vane, CH 2018 application/vnd.openxmlformats-officedocument.wordprocessingml.document https://www.repository.cam.ac.uk/handle/1810/273880 https://doi.org/10.17863/CAM.20956 eng eng American Geophysical Union (AGU) http://dx.doi.org/10.1002/2017gc007259 Geochemistry, Geophysics, Geosystems https://www.repository.cam.ac.uk/handle/1810/273880 doi:10.17863/CAM.20956 diagenesis Permo-Triassic East Greenland pyrite carbon Wordie Creek Article 2018 ftunivcam https://doi.org/10.17863/CAM.20956 2023-12-21T23:28:41Z <jats:title>Abstract</jats:title><jats:p>The measurement of isotope ratios in sedimentary rocks deposited over geological time can provide key insights to past environmental change over important intervals in the past. However, it is important to be aware that secondary alteration can overprint the original isotopic records. We demonstrate this principle using high‐resolution carbon, sulfur, and oxygen isotope measurements in organic carbon, pyrite, and carbonate minerals (δ<jats:sup>13</jats:sup>C<jats:sub>org</jats:sub>, δ<jats:sup>34</jats:sup>S<jats:sub>pyr</jats:sub>, δ<jats:sup>34</jats:sup>S<jats:sub>CAS</jats:sub>, δ<jats:sup>13</jats:sup>C<jats:sub>carb</jats:sub>, and δ<jats:sup>18</jats:sup>O<jats:sub>carb</jats:sub>) and kerogen analyses (HI and OI) from the Wordie Creek Formation, East Greenland. These sediments were initially deposited across the Permo‐Triassic transition, but as we will show, the carbonate record has been altered by interaction with meteoric water significantly after initial deposition. Comparison of the better preserved organic carbon and pyrite records with a proximal Permo‐Triassic sequence reveals significant pyrite‐sulfur isotope variability across the Permo‐Triassic transition. This regional heterogeneity argues against basin‐wide euxinia and instead suggests localized changes in sulfur fractionation in response to variations in organic carbon flux. This hypothesis can be used to explain seemingly inconsistent regional trends in other sulfur isotopes across the Permo‐Triassic transition.</jats:p> Article in Journal/Newspaper East Greenland Greenland Apollo - University of Cambridge Repository Greenland Wordie ENVELOPE(-67.500,-67.500,-69.167,-69.167) |
institution |
Open Polar |
collection |
Apollo - University of Cambridge Repository |
op_collection_id |
ftunivcam |
language |
English |
topic |
diagenesis Permo-Triassic East Greenland pyrite carbon Wordie Creek |
spellingShingle |
diagenesis Permo-Triassic East Greenland pyrite carbon Wordie Creek Roberts, J Turchyn, AV Wignall, PB Newton, RJ Vane, CH Disentangling Diagenesis From the Rock Record: An Example From the Permo-Triassic Wordie Creek Formation, East Greenland |
topic_facet |
diagenesis Permo-Triassic East Greenland pyrite carbon Wordie Creek |
description |
<jats:title>Abstract</jats:title><jats:p>The measurement of isotope ratios in sedimentary rocks deposited over geological time can provide key insights to past environmental change over important intervals in the past. However, it is important to be aware that secondary alteration can overprint the original isotopic records. We demonstrate this principle using high‐resolution carbon, sulfur, and oxygen isotope measurements in organic carbon, pyrite, and carbonate minerals (δ<jats:sup>13</jats:sup>C<jats:sub>org</jats:sub>, δ<jats:sup>34</jats:sup>S<jats:sub>pyr</jats:sub>, δ<jats:sup>34</jats:sup>S<jats:sub>CAS</jats:sub>, δ<jats:sup>13</jats:sup>C<jats:sub>carb</jats:sub>, and δ<jats:sup>18</jats:sup>O<jats:sub>carb</jats:sub>) and kerogen analyses (HI and OI) from the Wordie Creek Formation, East Greenland. These sediments were initially deposited across the Permo‐Triassic transition, but as we will show, the carbonate record has been altered by interaction with meteoric water significantly after initial deposition. Comparison of the better preserved organic carbon and pyrite records with a proximal Permo‐Triassic sequence reveals significant pyrite‐sulfur isotope variability across the Permo‐Triassic transition. This regional heterogeneity argues against basin‐wide euxinia and instead suggests localized changes in sulfur fractionation in response to variations in organic carbon flux. This hypothesis can be used to explain seemingly inconsistent regional trends in other sulfur isotopes across the Permo‐Triassic transition.</jats:p> |
format |
Article in Journal/Newspaper |
author |
Roberts, J Turchyn, AV Wignall, PB Newton, RJ Vane, CH |
author_facet |
Roberts, J Turchyn, AV Wignall, PB Newton, RJ Vane, CH |
author_sort |
Roberts, J |
title |
Disentangling Diagenesis From the Rock Record: An Example From the Permo-Triassic Wordie Creek Formation, East Greenland |
title_short |
Disentangling Diagenesis From the Rock Record: An Example From the Permo-Triassic Wordie Creek Formation, East Greenland |
title_full |
Disentangling Diagenesis From the Rock Record: An Example From the Permo-Triassic Wordie Creek Formation, East Greenland |
title_fullStr |
Disentangling Diagenesis From the Rock Record: An Example From the Permo-Triassic Wordie Creek Formation, East Greenland |
title_full_unstemmed |
Disentangling Diagenesis From the Rock Record: An Example From the Permo-Triassic Wordie Creek Formation, East Greenland |
title_sort |
disentangling diagenesis from the rock record: an example from the permo-triassic wordie creek formation, east greenland |
publisher |
American Geophysical Union (AGU) |
publishDate |
2018 |
url |
https://www.repository.cam.ac.uk/handle/1810/273880 https://doi.org/10.17863/CAM.20956 |
long_lat |
ENVELOPE(-67.500,-67.500,-69.167,-69.167) |
geographic |
Greenland Wordie |
geographic_facet |
Greenland Wordie |
genre |
East Greenland Greenland |
genre_facet |
East Greenland Greenland |
op_relation |
https://www.repository.cam.ac.uk/handle/1810/273880 doi:10.17863/CAM.20956 |
op_doi |
https://doi.org/10.17863/CAM.20956 |
_version_ |
1788060976153624576 |