Multi-elemental chemostratigraphy of Triassic mudstones in eastern Svalbard: implications for source rock formation in front of the World’s largest delta plain
The Triassic Boreal Ocean was a shallow epicontinental basin and the sink of the World's largest delta plain known to date. Nutrient and freshwater supply from this delta have been regarded as important causes for high productivity and water mass stratification, forming Middle Triassic oil-pron...
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ftunivtroemsoe:oai:munin.uit.no:10037/25120 2023-05-15T15:39:07+02:00 Multi-elemental chemostratigraphy of Triassic mudstones in eastern Svalbard: implications for source rock formation in front of the World’s largest delta plain Wesenlund, Fredrik Grundvåg, Sten-Andreas Engelschiøn, Victoria Sjøholt Thieβen, Olaf Pedersen, Jon Halvard 2022-02-03 https://hdl.handle.net/10037/25120 https://doi.org/10.1002/dep2.182 eng eng Wiley The Depositional Record FRIDAID 1998426 doi:10.1002/dep2.182 2055-4877 https://hdl.handle.net/10037/25120 openAccess Copyright 2022 The Author(s) Journal article Tidsskriftartikkel Peer reviewed publishedVersion 2022 ftunivtroemsoe https://doi.org/10.1002/dep2.182 2022-05-18T23:02:56Z The Triassic Boreal Ocean was a shallow epicontinental basin and the sink of the World's largest delta plain known to date. Nutrient and freshwater supply from this delta have been regarded as important causes for high productivity and water mass stratification, forming Middle Triassic oil-prone source rocks. Recent studies attribute upwelling and a productivity-induced oxygen minimum zone as important factors. A multi-elemental chemostratigraphic study of a Spathian–Carnian mudstone succession exposed in eastern Svalbard was performed to investigate their formation. This includes 89 samples from three localities, from which 34 elements were acquired using combustion and X-ray fluorescence analyses. The goal is to provide a correlation framework and infer the role of productivity, redox and water mass restriction on organic matter accumulation and source rock formation. These processes had major impact on the source potential. The Spathian Vendomdalen Member suggests deposition during intermittent benthic euxinia and low productivity, corresponding with a reported deep thermocline that obstructed upwelling. The lower Anisian lower–middle Muen Member shows negligible enrichment in redox-sensitive elements but in situ phosphate nodules, consistent with developing upwelling and moderate productivity. The middle Anisian upper Muen Member formed during high productivity and phosphogenesis and is linked with basin-wide upwelling. Productivity, phosphate and redox proxies are all strongly enriched in the upper Anisian–Ladinian Blanknuten Member. In the south-western Barents Sea, the pro-deltaic environment of the emerging Triassic Boreal Ocean delta system had terminated these conditions. The upper Ladinian upper Blanknuten Member formed within intermittent euxinic bottom waters due to the shallowing sea level. The Carnian Tschermakfjellet Formation marks the dominance of the prograding delta system and the end of Triassic oil-prone source rock formation in Svalbard. Article in Journal/Newspaper Barents Sea Svalbard University of Tromsø: Munin Open Research Archive Barents Sea Blanknuten ENVELOPE(21.263,21.263,77.987,77.987) Muen ENVELOPE(21.479,21.479,77.810,77.810) Svalbard Tschermakfjellet ENVELOPE(15.290,15.290,78.514,78.514) Vendomdalen ENVELOPE(17.321,17.321,78.201,78.201) The Depositional Record |
institution |
Open Polar |
collection |
University of Tromsø: Munin Open Research Archive |
op_collection_id |
ftunivtroemsoe |
language |
English |
description |
The Triassic Boreal Ocean was a shallow epicontinental basin and the sink of the World's largest delta plain known to date. Nutrient and freshwater supply from this delta have been regarded as important causes for high productivity and water mass stratification, forming Middle Triassic oil-prone source rocks. Recent studies attribute upwelling and a productivity-induced oxygen minimum zone as important factors. A multi-elemental chemostratigraphic study of a Spathian–Carnian mudstone succession exposed in eastern Svalbard was performed to investigate their formation. This includes 89 samples from three localities, from which 34 elements were acquired using combustion and X-ray fluorescence analyses. The goal is to provide a correlation framework and infer the role of productivity, redox and water mass restriction on organic matter accumulation and source rock formation. These processes had major impact on the source potential. The Spathian Vendomdalen Member suggests deposition during intermittent benthic euxinia and low productivity, corresponding with a reported deep thermocline that obstructed upwelling. The lower Anisian lower–middle Muen Member shows negligible enrichment in redox-sensitive elements but in situ phosphate nodules, consistent with developing upwelling and moderate productivity. The middle Anisian upper Muen Member formed during high productivity and phosphogenesis and is linked with basin-wide upwelling. Productivity, phosphate and redox proxies are all strongly enriched in the upper Anisian–Ladinian Blanknuten Member. In the south-western Barents Sea, the pro-deltaic environment of the emerging Triassic Boreal Ocean delta system had terminated these conditions. The upper Ladinian upper Blanknuten Member formed within intermittent euxinic bottom waters due to the shallowing sea level. The Carnian Tschermakfjellet Formation marks the dominance of the prograding delta system and the end of Triassic oil-prone source rock formation in Svalbard. |
format |
Article in Journal/Newspaper |
author |
Wesenlund, Fredrik Grundvåg, Sten-Andreas Engelschiøn, Victoria Sjøholt Thieβen, Olaf Pedersen, Jon Halvard |
spellingShingle |
Wesenlund, Fredrik Grundvåg, Sten-Andreas Engelschiøn, Victoria Sjøholt Thieβen, Olaf Pedersen, Jon Halvard Multi-elemental chemostratigraphy of Triassic mudstones in eastern Svalbard: implications for source rock formation in front of the World’s largest delta plain |
author_facet |
Wesenlund, Fredrik Grundvåg, Sten-Andreas Engelschiøn, Victoria Sjøholt Thieβen, Olaf Pedersen, Jon Halvard |
author_sort |
Wesenlund, Fredrik |
title |
Multi-elemental chemostratigraphy of Triassic mudstones in eastern Svalbard: implications for source rock formation in front of the World’s largest delta plain |
title_short |
Multi-elemental chemostratigraphy of Triassic mudstones in eastern Svalbard: implications for source rock formation in front of the World’s largest delta plain |
title_full |
Multi-elemental chemostratigraphy of Triassic mudstones in eastern Svalbard: implications for source rock formation in front of the World’s largest delta plain |
title_fullStr |
Multi-elemental chemostratigraphy of Triassic mudstones in eastern Svalbard: implications for source rock formation in front of the World’s largest delta plain |
title_full_unstemmed |
Multi-elemental chemostratigraphy of Triassic mudstones in eastern Svalbard: implications for source rock formation in front of the World’s largest delta plain |
title_sort |
multi-elemental chemostratigraphy of triassic mudstones in eastern svalbard: implications for source rock formation in front of the world’s largest delta plain |
publisher |
Wiley |
publishDate |
2022 |
url |
https://hdl.handle.net/10037/25120 https://doi.org/10.1002/dep2.182 |
long_lat |
ENVELOPE(21.263,21.263,77.987,77.987) ENVELOPE(21.479,21.479,77.810,77.810) ENVELOPE(15.290,15.290,78.514,78.514) ENVELOPE(17.321,17.321,78.201,78.201) |
geographic |
Barents Sea Blanknuten Muen Svalbard Tschermakfjellet Vendomdalen |
geographic_facet |
Barents Sea Blanknuten Muen Svalbard Tschermakfjellet Vendomdalen |
genre |
Barents Sea Svalbard |
genre_facet |
Barents Sea Svalbard |
op_relation |
The Depositional Record FRIDAID 1998426 doi:10.1002/dep2.182 2055-4877 https://hdl.handle.net/10037/25120 |
op_rights |
openAccess Copyright 2022 The Author(s) |
op_doi |
https://doi.org/10.1002/dep2.182 |
container_title |
The Depositional Record |
_version_ |
1766370559538495488 |