Facies, palynostratigraphy and sequence stratigraphy of the Wilhelmøya Subgroup (Upper Triassic–Middle Jurassic) in western central Spitsbergen, Svalbard
The Wilhelmøya Subgroup (Norian–Bathonian) is considered as the prime storage unit for locally produced CO2 in Longyearbyen on the Arctic archipelago of Svalbard. We here present new drillcore and outcrop data and refined sedimentological and sequence-stratigraphic interpretations from western centr...
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Geological Society of Norway
2019
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Online Access: | https://hdl.handle.net/1956/19796 https://doi.org/10.17850/njg001 |
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ftunivbergen:oai:bora.uib.no:1956/19796 2023-05-15T14:28:56+02:00 Facies, palynostratigraphy and sequence stratigraphy of the Wilhelmøya Subgroup (Upper Triassic–Middle Jurassic) in western central Spitsbergen, Svalbard Rismyhr, Bjarte Bjærke, Tor Olaussen, Snorre Mulrooney, Mark Joseph Senger, Kim 2019-01-17T13:29:04Z application/pdf https://hdl.handle.net/1956/19796 https://doi.org/10.17850/njg001 eng eng Geological Society of Norway urn:issn:0029-196X urn:issn:1502-5322 https://hdl.handle.net/1956/19796 https://doi.org/10.17850/njg001 cristin:1648319 Attribution CC BY http://creativecommons.org/licenses/by/4.0 Copyright 2018 The Author(s) Norsk Geologisk Tidsskrift Wilhelmøya Subgroup Brentskardhaugen Bed Sequence stratigraphy Facies analysis Palynology condensed unit Peer reviewed Journal article 2019 ftunivbergen https://doi.org/10.17850/njg001 2023-03-14T17:38:49Z The Wilhelmøya Subgroup (Norian–Bathonian) is considered as the prime storage unit for locally produced CO2 in Longyearbyen on the Arctic archipelago of Svalbard. We here present new drillcore and outcrop data and refined sedimentological and sequence-stratigraphic interpretations from western central Spitsbergen in and around the main potential CO2-storage area. The Wilhelmøya Subgroup encompasses a relatively thin (15–24 m) siliciclastic succession of mudstones, sandstones and conglomerates and represents an unconventional potential reservoir unit due to its relatively poor reservoir properties, i.e., low-moderate porosity and low permeability. Thirteen sedimentary facies were identified in the succession and subsequently grouped into five facies associations, reflecting deposition in various marginal marine to partly sediment-starved, shallow shelf environments. Palynological analysis was performed to determine the age and aid in the correlation between outcrop and subsurface sections. The palynological data allow identification of three unconformity-bounded sequences (sequence 1–3). These sequences record intermittent deposition in the Early Norian, Early–Middle Toarcian, and Late Toarcian–Aalenian, interrupted by extended periods of erosion, bypass and/or non-deposition. The stratigraphically condensed development of the Wilhelmøya Subgroup in western central Spitsbergen is interpreted to be the result of very low subsidence rates coupled with a physiographic setting characterised by a very gentle depositional gradient. This facilitated rapid shoreline shifts in response to even relatively modest variations in relative sea level with considerable influence on the resulting depositional patterns. We present a revised depositional model for the regionally distinct Brentskardhaugen Bed at the top of the Wilhelmøya Subgroup involving condensation and partial reworking of a series of Upper Toarcian–Aalenian, high-frequency sequences. Coarse-grained extraformational fractions observed within conglomerates of the ... Article in Journal/Newspaper Arctic Archipelago Arctic Longyearbyen Svalbard Wilhelmøya Spitsbergen University of Bergen: Bergen Open Research Archive (BORA-UiB) Arctic Brentskardhaugen ENVELOPE(16.922,16.922,78.184,78.184) Longyearbyen Svalbard Wilhelmøya ENVELOPE(20.418,20.418,79.062,79.062) Norwegian Journal of Geology |
institution |
Open Polar |
collection |
University of Bergen: Bergen Open Research Archive (BORA-UiB) |
op_collection_id |
ftunivbergen |
language |
English |
topic |
Wilhelmøya Subgroup Brentskardhaugen Bed Sequence stratigraphy Facies analysis Palynology condensed unit |
spellingShingle |
Wilhelmøya Subgroup Brentskardhaugen Bed Sequence stratigraphy Facies analysis Palynology condensed unit Rismyhr, Bjarte Bjærke, Tor Olaussen, Snorre Mulrooney, Mark Joseph Senger, Kim Facies, palynostratigraphy and sequence stratigraphy of the Wilhelmøya Subgroup (Upper Triassic–Middle Jurassic) in western central Spitsbergen, Svalbard |
topic_facet |
Wilhelmøya Subgroup Brentskardhaugen Bed Sequence stratigraphy Facies analysis Palynology condensed unit |
description |
The Wilhelmøya Subgroup (Norian–Bathonian) is considered as the prime storage unit for locally produced CO2 in Longyearbyen on the Arctic archipelago of Svalbard. We here present new drillcore and outcrop data and refined sedimentological and sequence-stratigraphic interpretations from western central Spitsbergen in and around the main potential CO2-storage area. The Wilhelmøya Subgroup encompasses a relatively thin (15–24 m) siliciclastic succession of mudstones, sandstones and conglomerates and represents an unconventional potential reservoir unit due to its relatively poor reservoir properties, i.e., low-moderate porosity and low permeability. Thirteen sedimentary facies were identified in the succession and subsequently grouped into five facies associations, reflecting deposition in various marginal marine to partly sediment-starved, shallow shelf environments. Palynological analysis was performed to determine the age and aid in the correlation between outcrop and subsurface sections. The palynological data allow identification of three unconformity-bounded sequences (sequence 1–3). These sequences record intermittent deposition in the Early Norian, Early–Middle Toarcian, and Late Toarcian–Aalenian, interrupted by extended periods of erosion, bypass and/or non-deposition. The stratigraphically condensed development of the Wilhelmøya Subgroup in western central Spitsbergen is interpreted to be the result of very low subsidence rates coupled with a physiographic setting characterised by a very gentle depositional gradient. This facilitated rapid shoreline shifts in response to even relatively modest variations in relative sea level with considerable influence on the resulting depositional patterns. We present a revised depositional model for the regionally distinct Brentskardhaugen Bed at the top of the Wilhelmøya Subgroup involving condensation and partial reworking of a series of Upper Toarcian–Aalenian, high-frequency sequences. Coarse-grained extraformational fractions observed within conglomerates of the ... |
format |
Article in Journal/Newspaper |
author |
Rismyhr, Bjarte Bjærke, Tor Olaussen, Snorre Mulrooney, Mark Joseph Senger, Kim |
author_facet |
Rismyhr, Bjarte Bjærke, Tor Olaussen, Snorre Mulrooney, Mark Joseph Senger, Kim |
author_sort |
Rismyhr, Bjarte |
title |
Facies, palynostratigraphy and sequence stratigraphy of the Wilhelmøya Subgroup (Upper Triassic–Middle Jurassic) in western central Spitsbergen, Svalbard |
title_short |
Facies, palynostratigraphy and sequence stratigraphy of the Wilhelmøya Subgroup (Upper Triassic–Middle Jurassic) in western central Spitsbergen, Svalbard |
title_full |
Facies, palynostratigraphy and sequence stratigraphy of the Wilhelmøya Subgroup (Upper Triassic–Middle Jurassic) in western central Spitsbergen, Svalbard |
title_fullStr |
Facies, palynostratigraphy and sequence stratigraphy of the Wilhelmøya Subgroup (Upper Triassic–Middle Jurassic) in western central Spitsbergen, Svalbard |
title_full_unstemmed |
Facies, palynostratigraphy and sequence stratigraphy of the Wilhelmøya Subgroup (Upper Triassic–Middle Jurassic) in western central Spitsbergen, Svalbard |
title_sort |
facies, palynostratigraphy and sequence stratigraphy of the wilhelmøya subgroup (upper triassic–middle jurassic) in western central spitsbergen, svalbard |
publisher |
Geological Society of Norway |
publishDate |
2019 |
url |
https://hdl.handle.net/1956/19796 https://doi.org/10.17850/njg001 |
long_lat |
ENVELOPE(16.922,16.922,78.184,78.184) ENVELOPE(20.418,20.418,79.062,79.062) |
geographic |
Arctic Brentskardhaugen Longyearbyen Svalbard Wilhelmøya |
geographic_facet |
Arctic Brentskardhaugen Longyearbyen Svalbard Wilhelmøya |
genre |
Arctic Archipelago Arctic Longyearbyen Svalbard Wilhelmøya Spitsbergen |
genre_facet |
Arctic Archipelago Arctic Longyearbyen Svalbard Wilhelmøya Spitsbergen |
op_source |
Norsk Geologisk Tidsskrift |
op_relation |
urn:issn:0029-196X urn:issn:1502-5322 https://hdl.handle.net/1956/19796 https://doi.org/10.17850/njg001 cristin:1648319 |
op_rights |
Attribution CC BY http://creativecommons.org/licenses/by/4.0 Copyright 2018 The Author(s) |
op_doi |
https://doi.org/10.17850/njg001 |
container_title |
Norwegian Journal of Geology |
_version_ |
1766303060590592000 |