Sedimentology and palynology of the Lower Cretaceous succession of central Spitsbergen: integration of subsurface and outcrop data
Source at https://dx.doi.org/10.17850/njg006. © Copyright the authors. This work is licensed under a Creative Commons Attribution 4.0 International License. The Lower Cretaceous succession in Svalbard is commonly considered as an important analogue to age-equivalent strata on the Barents Shelf which...
Published in: | Norwegian Journal of Geology |
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Main Authors: | , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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Norsk Geologisk Forening
2019
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Online Access: | https://hdl.handle.net/10037/16618 https://doi.org/10.17850/njg006 |
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Open Polar |
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University of Tromsø: Munin Open Research Archive |
op_collection_id |
ftunivtroemsoe |
language |
English |
topic |
VDP::Mathematics and natural science: 400::Geosciences: 450 VDP::Matematikk og Naturvitenskap: 400::Geofag: 450 |
spellingShingle |
VDP::Mathematics and natural science: 400::Geosciences: 450 VDP::Matematikk og Naturvitenskap: 400::Geofag: 450 Grundvåg, Sten-A Jelby, Mads Engholm Śliwińska, Kasia Kamila Nøhr-Hansen, Henrik Aadland, Tore Sandvik, Sara Elvelund Tennvassås, Ingrid Engen, Thea Olaussen, Snorre Sedimentology and palynology of the Lower Cretaceous succession of central Spitsbergen: integration of subsurface and outcrop data |
topic_facet |
VDP::Mathematics and natural science: 400::Geosciences: 450 VDP::Matematikk og Naturvitenskap: 400::Geofag: 450 |
description |
Source at https://dx.doi.org/10.17850/njg006. © Copyright the authors. This work is licensed under a Creative Commons Attribution 4.0 International License. The Lower Cretaceous succession in Svalbard is commonly considered as an important analogue to age-equivalent strata on the Barents Shelf which are sporadically targeted by exploration wells. In this study, the stratigraphic and genetic relationship between the Rurikfjellet (open marine), Helvetiafjellet (paralic) and Carolinefjellet (open marine) formations of the Lower Cretaceous succession in Svalbard is evaluated by combining sedimentological outcrop studies with well log and core data across Nordenskiöld Land, central Spitsbergen. Sedimentological characteristics and stratigraphic units are mapped within a refined dinocyst biostratigraphic framework, enabling relatively well-constrained palaeogeographic reconstructions. The Valanginian–lowermost Barremian Rurikfjellet Formation consists of a lower shale-dominated unit of offshore origin which grades upwards into storm-reworked lower shoreface sandstones displaying hummocky cross-stratification. Local occurrences of prodeltaic successions and thick successions of gravity flow deposits containing coal-bearing slump blocks of delta plain origin in some wells, reveal a late Hauterivian progradational pulse which has previously not been recorded in Svalbard. The lower Barremian– lower Aptian Helvetiafjellet Formation consists of fluvial braidplain and paralic deposits which rest unconformably on the Rurikfjellet Formation across the entire study area, reflecting regional uplift and widespread subaerial exposure prior to the onset of paralic deposition. The Helvetiafjellet Formation exhibits increased marine influence upwards, and in the investigated cores the uppermost part of the unit consists of wave-reworked mouth-bar deposits which are truncated by a transgressive conglomerate lag dominated by extrabasinal lithic clasts and intraformational siderite clasts. An up to 10 m-thick, regionally extensive, organic-rich (TOC up to 2.1 wt.%) shale unit of early Aptian age marks the base of the overlying Carolinefjellet Formation. The shale accumulated during a regional flooding event which drowned and eventually transformed the Helvetiafjellet Formation coastal plain into a shallow shelf. The organic facies of the shale unit (Type II–III kerogen) and a high Pr/Ph ratio (>2), in combination with abundant long-chained n-alkanes, suggest that the unit was deposited in a suboxic paralic marine environment strongly influenced by input of terrestrial organic matter. The investigated succession exhibits stratigraphic and petrographic resemblance to age-equivalent strata in NE Greenland, suggesting that these successions may have formed part of the same drainage system located on the northwestern margin of the Barents Shelf. Thus, by highlighting the Early Cretaceous palaeogeographic evolution in Svalbard, this study contributes to the regional stratigraphic understanding of the Lower Cretaceous succession on the wider northern Barents Shelf |
format |
Article in Journal/Newspaper |
author |
Grundvåg, Sten-A Jelby, Mads Engholm Śliwińska, Kasia Kamila Nøhr-Hansen, Henrik Aadland, Tore Sandvik, Sara Elvelund Tennvassås, Ingrid Engen, Thea Olaussen, Snorre |
author_facet |
Grundvåg, Sten-A Jelby, Mads Engholm Śliwińska, Kasia Kamila Nøhr-Hansen, Henrik Aadland, Tore Sandvik, Sara Elvelund Tennvassås, Ingrid Engen, Thea Olaussen, Snorre |
author_sort |
Grundvåg, Sten-A |
title |
Sedimentology and palynology of the Lower Cretaceous succession of central Spitsbergen: integration of subsurface and outcrop data |
title_short |
Sedimentology and palynology of the Lower Cretaceous succession of central Spitsbergen: integration of subsurface and outcrop data |
title_full |
Sedimentology and palynology of the Lower Cretaceous succession of central Spitsbergen: integration of subsurface and outcrop data |
title_fullStr |
Sedimentology and palynology of the Lower Cretaceous succession of central Spitsbergen: integration of subsurface and outcrop data |
title_full_unstemmed |
Sedimentology and palynology of the Lower Cretaceous succession of central Spitsbergen: integration of subsurface and outcrop data |
title_sort |
sedimentology and palynology of the lower cretaceous succession of central spitsbergen: integration of subsurface and outcrop data |
publisher |
Norsk Geologisk Forening |
publishDate |
2019 |
url |
https://hdl.handle.net/10037/16618 https://doi.org/10.17850/njg006 |
long_lat |
ENVELOPE(15.850,15.850,78.300,78.300) ENVELOPE(16.232,16.232,78.213,78.213) ENVELOPE(15.000,15.000,77.833,77.833) ENVELOPE(18.217,18.217,77.983,77.983) |
geographic |
Carolinefjellet Greenland Helvetiafjellet Nordenskiöld Land Rurikfjellet Svalbard |
geographic_facet |
Carolinefjellet Greenland Helvetiafjellet Nordenskiöld Land Rurikfjellet Svalbard |
genre |
Arctic Greenland Nordenskiöld Land Svalbard Spitsbergen |
genre_facet |
Arctic Greenland Nordenskiöld Land Svalbard Spitsbergen |
op_relation |
Norwegian Journal of Geology info:eu-repo/grantAgreement/RCN/PETROSENTR/228107/Norway/Research Centre for Arctic Petroleum Exploration/ARCEx/ Grundvåg, S-A., Jelby, M.E., Śliwińska, K.K., Nøhr-Hansen, H., Aadland, T., Sandvik, S.E., Tennvassås, . Olaussen, S. (2019). Sedimentology and palynology of the Lower Cretaceous succession of central Spitsbergen: integration of subsurface and outcrop data. Norwegian Journal of Geology, 99 (2). https://dx.doi.org/10.17850/njg006 FRIDAID 1734222 doi:10.17850/njg006 2387-5844 2387-5852 https://hdl.handle.net/10037/16618 |
op_rights |
openAccess |
op_doi |
https://doi.org/10.17850/njg006 |
container_title |
Norwegian Journal of Geology |
_version_ |
1766301196912427008 |
spelling |
ftunivtroemsoe:oai:munin.uit.no:10037/16618 2023-05-15T14:27:27+02:00 Sedimentology and palynology of the Lower Cretaceous succession of central Spitsbergen: integration of subsurface and outcrop data Grundvåg, Sten-A Jelby, Mads Engholm Śliwińska, Kasia Kamila Nøhr-Hansen, Henrik Aadland, Tore Sandvik, Sara Elvelund Tennvassås, Ingrid Engen, Thea Olaussen, Snorre 2019-06-27 https://hdl.handle.net/10037/16618 https://doi.org/10.17850/njg006 eng eng Norsk Geologisk Forening Norwegian Journal of Geology info:eu-repo/grantAgreement/RCN/PETROSENTR/228107/Norway/Research Centre for Arctic Petroleum Exploration/ARCEx/ Grundvåg, S-A., Jelby, M.E., Śliwińska, K.K., Nøhr-Hansen, H., Aadland, T., Sandvik, S.E., Tennvassås, . Olaussen, S. (2019). Sedimentology and palynology of the Lower Cretaceous succession of central Spitsbergen: integration of subsurface and outcrop data. Norwegian Journal of Geology, 99 (2). https://dx.doi.org/10.17850/njg006 FRIDAID 1734222 doi:10.17850/njg006 2387-5844 2387-5852 https://hdl.handle.net/10037/16618 openAccess VDP::Mathematics and natural science: 400::Geosciences: 450 VDP::Matematikk og Naturvitenskap: 400::Geofag: 450 Journal article Tidsskriftartikkel Peer reviewed 2019 ftunivtroemsoe https://doi.org/10.17850/njg006 2021-06-25T17:56:56Z Source at https://dx.doi.org/10.17850/njg006. © Copyright the authors. This work is licensed under a Creative Commons Attribution 4.0 International License. The Lower Cretaceous succession in Svalbard is commonly considered as an important analogue to age-equivalent strata on the Barents Shelf which are sporadically targeted by exploration wells. In this study, the stratigraphic and genetic relationship between the Rurikfjellet (open marine), Helvetiafjellet (paralic) and Carolinefjellet (open marine) formations of the Lower Cretaceous succession in Svalbard is evaluated by combining sedimentological outcrop studies with well log and core data across Nordenskiöld Land, central Spitsbergen. Sedimentological characteristics and stratigraphic units are mapped within a refined dinocyst biostratigraphic framework, enabling relatively well-constrained palaeogeographic reconstructions. The Valanginian–lowermost Barremian Rurikfjellet Formation consists of a lower shale-dominated unit of offshore origin which grades upwards into storm-reworked lower shoreface sandstones displaying hummocky cross-stratification. Local occurrences of prodeltaic successions and thick successions of gravity flow deposits containing coal-bearing slump blocks of delta plain origin in some wells, reveal a late Hauterivian progradational pulse which has previously not been recorded in Svalbard. The lower Barremian– lower Aptian Helvetiafjellet Formation consists of fluvial braidplain and paralic deposits which rest unconformably on the Rurikfjellet Formation across the entire study area, reflecting regional uplift and widespread subaerial exposure prior to the onset of paralic deposition. The Helvetiafjellet Formation exhibits increased marine influence upwards, and in the investigated cores the uppermost part of the unit consists of wave-reworked mouth-bar deposits which are truncated by a transgressive conglomerate lag dominated by extrabasinal lithic clasts and intraformational siderite clasts. An up to 10 m-thick, regionally extensive, organic-rich (TOC up to 2.1 wt.%) shale unit of early Aptian age marks the base of the overlying Carolinefjellet Formation. The shale accumulated during a regional flooding event which drowned and eventually transformed the Helvetiafjellet Formation coastal plain into a shallow shelf. The organic facies of the shale unit (Type II–III kerogen) and a high Pr/Ph ratio (>2), in combination with abundant long-chained n-alkanes, suggest that the unit was deposited in a suboxic paralic marine environment strongly influenced by input of terrestrial organic matter. The investigated succession exhibits stratigraphic and petrographic resemblance to age-equivalent strata in NE Greenland, suggesting that these successions may have formed part of the same drainage system located on the northwestern margin of the Barents Shelf. Thus, by highlighting the Early Cretaceous palaeogeographic evolution in Svalbard, this study contributes to the regional stratigraphic understanding of the Lower Cretaceous succession on the wider northern Barents Shelf Article in Journal/Newspaper Arctic Greenland Nordenskiöld Land Svalbard Spitsbergen University of Tromsø: Munin Open Research Archive Carolinefjellet ENVELOPE(15.850,15.850,78.300,78.300) Greenland Helvetiafjellet ENVELOPE(16.232,16.232,78.213,78.213) Nordenskiöld Land ENVELOPE(15.000,15.000,77.833,77.833) Rurikfjellet ENVELOPE(18.217,18.217,77.983,77.983) Svalbard Norwegian Journal of Geology |