The Sirius Passet Lagerstätte of North Greenland—A geochemical window on early Cambrian low-oxygen environments and ecosystems
The early Cambrian Sirius Passet fauna of northernmost Greenland (Cambrian Series 2, Stage 3) contains exceptionally preserved soft tissues that provide an important window to early animal evolution, while the surrounding sediment holds critical data on the palaeodepositional water-column chemistry....
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Language: | English |
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Wiley-Blackwell
2019
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Online Access: | https://lup.lub.lu.se/record/66b54126-6db7-4dd6-a08e-a10361dd5f55 https://doi.org/10.1111/gbi.12315 |
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ftulundlup:oai:lup.lub.lu.se:66b54126-6db7-4dd6-a08e-a10361dd5f55 2024-05-12T08:04:30+00:00 The Sirius Passet Lagerstätte of North Greenland—A geochemical window on early Cambrian low-oxygen environments and ecosystems Hammarlund, Emma U. Smith, M. Paul Rasmussen, Jan A. Nielsen, Arne T. Canfield, Donald E. Harper, David A.T. 2019-01 https://lup.lub.lu.se/record/66b54126-6db7-4dd6-a08e-a10361dd5f55 https://doi.org/10.1111/gbi.12315 eng eng Wiley-Blackwell https://lup.lub.lu.se/record/66b54126-6db7-4dd6-a08e-a10361dd5f55 http://dx.doi.org/10.1111/gbi.12315 pmid:30264482 scopus:85053897843 Geobiology; 17(1), pp 12-26 (2019) ISSN: 1472-4677 Geochemistry Cambrian explosion oxygen minimum zone Sirius Passet soft-tissue fossil preservation water-column chemistry contributiontojournal/article info:eu-repo/semantics/article text 2019 ftulundlup https://doi.org/10.1111/gbi.12315 2024-04-17T14:08:07Z The early Cambrian Sirius Passet fauna of northernmost Greenland (Cambrian Series 2, Stage 3) contains exceptionally preserved soft tissues that provide an important window to early animal evolution, while the surrounding sediment holds critical data on the palaeodepositional water-column chemistry. The present study combines palaeontological data with a multiproxy geochemical approach based on samples collected in situ at high stratigraphic resolution from Sirius Passet. After careful consideration of chemical alterations during burial, our results demonstrate that fossil preservation and biodiversity show significant correlation with iron enrichments (FeHR/FeT), trace metal behaviour (V/Al), and changes in nitrogen cycling (δ15N). These data, together with Mo/Al and the preservation of organic carbon (TOC), are consistent with a water column that was transiently low in oxygen concentration, or even intermittently anoxic. When compared with the biogeochemical characteristics of modern oxygen minimum zones (OMZs), geochemical and palaeontological data collectively suggest that oxygen concentrations as low as 0.2–0.4 ml/L restricted bioturbation but not the development of a largely nektobenthic community of predators and scavengers. We envisage for the Sirius Passet biota a depositional setting where anoxic water column conditions developed and passed over the depositional site, possibly in association with sea-level change, and where this early Cambrian biota was established in conditions with very low oxygen. Article in Journal/Newspaper Greenland North Greenland Lund University Publications (LUP) Greenland Sirius ENVELOPE(163.250,163.250,-84.133,-84.133) Geobiology 17 1 12 26 |
institution |
Open Polar |
collection |
Lund University Publications (LUP) |
op_collection_id |
ftulundlup |
language |
English |
topic |
Geochemistry Cambrian explosion oxygen minimum zone Sirius Passet soft-tissue fossil preservation water-column chemistry |
spellingShingle |
Geochemistry Cambrian explosion oxygen minimum zone Sirius Passet soft-tissue fossil preservation water-column chemistry Hammarlund, Emma U. Smith, M. Paul Rasmussen, Jan A. Nielsen, Arne T. Canfield, Donald E. Harper, David A.T. The Sirius Passet Lagerstätte of North Greenland—A geochemical window on early Cambrian low-oxygen environments and ecosystems |
topic_facet |
Geochemistry Cambrian explosion oxygen minimum zone Sirius Passet soft-tissue fossil preservation water-column chemistry |
description |
The early Cambrian Sirius Passet fauna of northernmost Greenland (Cambrian Series 2, Stage 3) contains exceptionally preserved soft tissues that provide an important window to early animal evolution, while the surrounding sediment holds critical data on the palaeodepositional water-column chemistry. The present study combines palaeontological data with a multiproxy geochemical approach based on samples collected in situ at high stratigraphic resolution from Sirius Passet. After careful consideration of chemical alterations during burial, our results demonstrate that fossil preservation and biodiversity show significant correlation with iron enrichments (FeHR/FeT), trace metal behaviour (V/Al), and changes in nitrogen cycling (δ15N). These data, together with Mo/Al and the preservation of organic carbon (TOC), are consistent with a water column that was transiently low in oxygen concentration, or even intermittently anoxic. When compared with the biogeochemical characteristics of modern oxygen minimum zones (OMZs), geochemical and palaeontological data collectively suggest that oxygen concentrations as low as 0.2–0.4 ml/L restricted bioturbation but not the development of a largely nektobenthic community of predators and scavengers. We envisage for the Sirius Passet biota a depositional setting where anoxic water column conditions developed and passed over the depositional site, possibly in association with sea-level change, and where this early Cambrian biota was established in conditions with very low oxygen. |
format |
Article in Journal/Newspaper |
author |
Hammarlund, Emma U. Smith, M. Paul Rasmussen, Jan A. Nielsen, Arne T. Canfield, Donald E. Harper, David A.T. |
author_facet |
Hammarlund, Emma U. Smith, M. Paul Rasmussen, Jan A. Nielsen, Arne T. Canfield, Donald E. Harper, David A.T. |
author_sort |
Hammarlund, Emma U. |
title |
The Sirius Passet Lagerstätte of North Greenland—A geochemical window on early Cambrian low-oxygen environments and ecosystems |
title_short |
The Sirius Passet Lagerstätte of North Greenland—A geochemical window on early Cambrian low-oxygen environments and ecosystems |
title_full |
The Sirius Passet Lagerstätte of North Greenland—A geochemical window on early Cambrian low-oxygen environments and ecosystems |
title_fullStr |
The Sirius Passet Lagerstätte of North Greenland—A geochemical window on early Cambrian low-oxygen environments and ecosystems |
title_full_unstemmed |
The Sirius Passet Lagerstätte of North Greenland—A geochemical window on early Cambrian low-oxygen environments and ecosystems |
title_sort |
sirius passet lagerstätte of north greenland—a geochemical window on early cambrian low-oxygen environments and ecosystems |
publisher |
Wiley-Blackwell |
publishDate |
2019 |
url |
https://lup.lub.lu.se/record/66b54126-6db7-4dd6-a08e-a10361dd5f55 https://doi.org/10.1111/gbi.12315 |
long_lat |
ENVELOPE(163.250,163.250,-84.133,-84.133) |
geographic |
Greenland Sirius |
geographic_facet |
Greenland Sirius |
genre |
Greenland North Greenland |
genre_facet |
Greenland North Greenland |
op_source |
Geobiology; 17(1), pp 12-26 (2019) ISSN: 1472-4677 |
op_relation |
https://lup.lub.lu.se/record/66b54126-6db7-4dd6-a08e-a10361dd5f55 http://dx.doi.org/10.1111/gbi.12315 pmid:30264482 scopus:85053897843 |
op_doi |
https://doi.org/10.1111/gbi.12315 |
container_title |
Geobiology |
container_volume |
17 |
container_issue |
1 |
container_start_page |
12 |
op_container_end_page |
26 |
_version_ |
1798846725359665152 |