A Miocene age for the Molo Formation, Norwegian Sea shelf off Vestfjorden, based on marine palynology
Seven side-wall core samples from the lower part of the Molo Formation in exploration well 6610/3–1 off Vestfjorden/Lofoten have been reanalysed for marine palynomorphs. Description of new species from other studies and access to reference successions from nearby sites with an independent chronostra...
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ftunivtroemsoe:oai:munin.uit.no:10037/17654 2023-05-15T17:08:18+02:00 A Miocene age for the Molo Formation, Norwegian Sea shelf off Vestfjorden, based on marine palynology Grøsfjeld, Kari Dybkjær, Karen Eidvin, Tor Riis, Fridtjof Rasmussen, Erik Skovbjerg Knies, Jochen 2019-12-10 https://hdl.handle.net/10037/17654 https://doi.org/10.17850/njg99-3-6 eng eng Norwegian Journal of Geology Norwegian Journal of Geology Grøsfjeld K, Dybkjær K, Eidvin T, Riis F, Rasmussen ES, Knies J. A Miocene age for the Molo Formation, Norwegian Sea shelf off Vestfjorden, based on marine palynology . Norwegian Journal of Geology. 2019;99(3):1-25 FRIDAID 1799543 doi:10.17850/njg99-3-6 2387-5844 2387-5852 https://hdl.handle.net/10037/17654 Copyright 2019 The Author(s) VDP::Mathematics and natural science: 400::Geosciences: 450 VDP::Matematikk og Naturvitenskap: 400::Geofag: 450 Journal article Tidsskriftartikkel Peer reviewed publishedVersion 2019 ftunivtroemsoe https://doi.org/10.17850/njg99-3-6 2021-06-25T17:57:17Z Seven side-wall core samples from the lower part of the Molo Formation in exploration well 6610/3–1 off Vestfjorden/Lofoten have been reanalysed for marine palynomorphs. Description of new species from other studies and access to reference successions from nearby sites with an independent chronostratigraphy have enabled a more reliable depositional age constraint for the Molo Formation in its northern distribution area than previously achieved. The new data (e.g., the lowest occurrence of the dinoflagellate cysts Barssidinium graminosum and Barssidinium pliocenicum and the highest occurrence of the dinoflagellate cysts Minisphaeridium latirictum and Operculodinium piaseckii) provide incontrovertible evidence for a Miocene age for the Molo Formation in well 6610/3–1. Our data suggest that the Molo Formation in well 6610/3–1 started to accumulate after erosional activity which took place between the late middle Miocene and the late Miocene. The data (especially the presence of the dinoflagellate cyst A. andalouisiensis andalousiensis, the co-occurrence of the dinoflagellate cysts Barssidinium evangelineae and M. latirictum and the presence of the acritarch L. lucifer) suggest that the Molo Formation in well 6610/3–1 started to accumulate at around 8.8 / 8.7 Ma. The sediments were deposited in a warm temperate, high-energy environment influenced by river discharge. During deposition, older sediments, particularly from the Paleogene, became extensively eroded. The erosion and rapid accumulation were probably associated with the combined effects of eustatic sea-level fall and uplift/updoming of the hinterland/coastal zone. Article in Journal/Newspaper Lofoten Norwegian Sea Vestfjorden University of Tromsø: Munin Open Research Archive Lofoten Norwegian Sea Norwegian Journal of Geology |
institution |
Open Polar |
collection |
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 Grøsfjeld, Kari Dybkjær, Karen Eidvin, Tor Riis, Fridtjof Rasmussen, Erik Skovbjerg Knies, Jochen A Miocene age for the Molo Formation, Norwegian Sea shelf off Vestfjorden, based on marine palynology |
topic_facet |
VDP::Mathematics and natural science: 400::Geosciences: 450 VDP::Matematikk og Naturvitenskap: 400::Geofag: 450 |
description |
Seven side-wall core samples from the lower part of the Molo Formation in exploration well 6610/3–1 off Vestfjorden/Lofoten have been reanalysed for marine palynomorphs. Description of new species from other studies and access to reference successions from nearby sites with an independent chronostratigraphy have enabled a more reliable depositional age constraint for the Molo Formation in its northern distribution area than previously achieved. The new data (e.g., the lowest occurrence of the dinoflagellate cysts Barssidinium graminosum and Barssidinium pliocenicum and the highest occurrence of the dinoflagellate cysts Minisphaeridium latirictum and Operculodinium piaseckii) provide incontrovertible evidence for a Miocene age for the Molo Formation in well 6610/3–1. Our data suggest that the Molo Formation in well 6610/3–1 started to accumulate after erosional activity which took place between the late middle Miocene and the late Miocene. The data (especially the presence of the dinoflagellate cyst A. andalouisiensis andalousiensis, the co-occurrence of the dinoflagellate cysts Barssidinium evangelineae and M. latirictum and the presence of the acritarch L. lucifer) suggest that the Molo Formation in well 6610/3–1 started to accumulate at around 8.8 / 8.7 Ma. The sediments were deposited in a warm temperate, high-energy environment influenced by river discharge. During deposition, older sediments, particularly from the Paleogene, became extensively eroded. The erosion and rapid accumulation were probably associated with the combined effects of eustatic sea-level fall and uplift/updoming of the hinterland/coastal zone. |
format |
Article in Journal/Newspaper |
author |
Grøsfjeld, Kari Dybkjær, Karen Eidvin, Tor Riis, Fridtjof Rasmussen, Erik Skovbjerg Knies, Jochen |
author_facet |
Grøsfjeld, Kari Dybkjær, Karen Eidvin, Tor Riis, Fridtjof Rasmussen, Erik Skovbjerg Knies, Jochen |
author_sort |
Grøsfjeld, Kari |
title |
A Miocene age for the Molo Formation, Norwegian Sea shelf off Vestfjorden, based on marine palynology |
title_short |
A Miocene age for the Molo Formation, Norwegian Sea shelf off Vestfjorden, based on marine palynology |
title_full |
A Miocene age for the Molo Formation, Norwegian Sea shelf off Vestfjorden, based on marine palynology |
title_fullStr |
A Miocene age for the Molo Formation, Norwegian Sea shelf off Vestfjorden, based on marine palynology |
title_full_unstemmed |
A Miocene age for the Molo Formation, Norwegian Sea shelf off Vestfjorden, based on marine palynology |
title_sort |
miocene age for the molo formation, norwegian sea shelf off vestfjorden, based on marine palynology |
publisher |
Norwegian Journal of Geology |
publishDate |
2019 |
url |
https://hdl.handle.net/10037/17654 https://doi.org/10.17850/njg99-3-6 |
geographic |
Lofoten Norwegian Sea |
geographic_facet |
Lofoten Norwegian Sea |
genre |
Lofoten Norwegian Sea Vestfjorden |
genre_facet |
Lofoten Norwegian Sea Vestfjorden |
op_relation |
Norwegian Journal of Geology Grøsfjeld K, Dybkjær K, Eidvin T, Riis F, Rasmussen ES, Knies J. A Miocene age for the Molo Formation, Norwegian Sea shelf off Vestfjorden, based on marine palynology . Norwegian Journal of Geology. 2019;99(3):1-25 FRIDAID 1799543 doi:10.17850/njg99-3-6 2387-5844 2387-5852 https://hdl.handle.net/10037/17654 |
op_rights |
Copyright 2019 The Author(s) |
op_doi |
https://doi.org/10.17850/njg99-3-6 |
container_title |
Norwegian Journal of Geology |
_version_ |
1766064037906350080 |