Disentangling Diagenesis From the Rock Record: An Example From the Permo‐Triassic Wordie Creek Formation, East Greenland
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...
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American Geophysical Union
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ftleedsuniv:oai:eprints.whiterose.ac.uk:127014 2023-05-15T16:03:37+02:00 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 2018-01-16 text https://eprints.whiterose.ac.uk/127014/ https://eprints.whiterose.ac.uk/127014/25/2017GC007259.pdf en eng American Geophysical Union https://eprints.whiterose.ac.uk/127014/25/2017GC007259.pdf Roberts, J, Turchyn, AV, Wignall, PB orcid.org/0000-0003-0074-9129 et al. (2 more authors) (2018) Disentangling Diagenesis From the Rock Record: An Example From the Permo‐Triassic Wordie Creek Formation, East Greenland. Geochemistry, Geophysics, Geosystems, 19 (1). pp. 99-113. ISSN 1525-2027 cc_by_4 CC-BY Article NonPeerReviewed 2018 ftleedsuniv 2023-01-30T22:03:27Z 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 13 C org , δ 34 S pyr , δ 34 S CAS , δ 13 C carb , and δ 18 O carb ) 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. Article in Journal/Newspaper East Greenland Greenland White Rose Research Online (Universities of Leeds, Sheffield & York) Greenland Wordie ENVELOPE(-67.500,-67.500,-69.167,-69.167) |
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Open Polar |
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White Rose Research Online (Universities of Leeds, Sheffield & York) |
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ftleedsuniv |
language |
English |
description |
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 13 C org , δ 34 S pyr , δ 34 S CAS , δ 13 C carb , and δ 18 O carb ) 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. |
format |
Article in Journal/Newspaper |
author |
Roberts, J Turchyn, AV Wignall, PB Newton, RJ Vane, CH |
spellingShingle |
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 |
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 |
publishDate |
2018 |
url |
https://eprints.whiterose.ac.uk/127014/ https://eprints.whiterose.ac.uk/127014/25/2017GC007259.pdf |
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://eprints.whiterose.ac.uk/127014/25/2017GC007259.pdf Roberts, J, Turchyn, AV, Wignall, PB orcid.org/0000-0003-0074-9129 et al. (2 more authors) (2018) Disentangling Diagenesis From the Rock Record: An Example From the Permo‐Triassic Wordie Creek Formation, East Greenland. Geochemistry, Geophysics, Geosystems, 19 (1). pp. 99-113. ISSN 1525-2027 |
op_rights |
cc_by_4 |
op_rightsnorm |
CC-BY |
_version_ |
1766399318621683712 |