Palynology of the Triassic–Jurassic transition of the Danish Basin (Denmark): a palynostratigraphic zonation of the Gassum–lower Fjerritslev formations
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Palynology of the Triassic–Jurassic transition of the Danish Basin (Denmark) : a palynostratigraphic zonation of the Gassum–lower Fjerritslev formations. / Lindström, Sofie; Pedersen, Gunver Krarup ; Vosgerau, Henrik; Hovikoski, Jussi; Dybkjær, Karen; Nielsen, Lars Henrik.
In: Palynology, Vol. 47, No. 4, 2241068, 2023.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Palynology of the Triassic–Jurassic transition of the Danish Basin (Denmark)
T2 - a palynostratigraphic zonation of the Gassum–lower Fjerritslev formations
AU - Lindström, Sofie
AU - Pedersen, Gunver Krarup
AU - Vosgerau, Henrik
AU - Hovikoski, Jussi
AU - Dybkjær, Karen
AU - Nielsen, Lars Henrik
PY - 2023
Y1 - 2023
N2 - The Upper Triassic–Lower Jurassic succession in the Danish Basin is penetrated by many deep wells that were drilled during former hydrocarbon exploration campaignes but it is today targeted for geothermal energy and storage of CO2. In the Stenlille salt dome on Sjælland sandstones of the Gassum Formation, sealed by the overlying Fjerritslev Formation mudstones, have been used for decades as a seasonal storage for natural gas. With its comprehensive dataset of seismics, geophysical well logs and conventional core data from twenty wells, the Stenlille succession serves as a model for other salt domes currently evaluated as potential CO2 storage sites in the basins. Over the last decade the cored Triassic–Jurassic boundary (TJB) succession has contributed to the understanding of environmental and palynological events during the end-Triassic mass extinction. Core, sidewall core and cuttings samples from several of the closely situated Stenlille wells are here used for establishment of a high-resolution palynostratigraphic zonation scheme covering the entire Rhaetian to Sinemurian succession by integrating new analyses with previously published data. The palynological data set have allowed recognition of nine formally described spore-pollen zones of which eight are new, while two previously described dinoflagellate cysts zones are subdivided into 3 informal subzones each. The palynological zonation is integrated with a sequence stratigraphic framework and will form the basis for the dating of future well sections in the Danish Basin as well as other basins and for correlation to outcrops. The large palynological dataset further shows that the vegetation around the Danish Basin was remarkably stable during the early to middle Rhaetian, but that events related to the emplacement of the Central Atlantic Magmatic Province accelerated ecosystem changes during c. 175 kyrs in the late Rhaetian and earliest Hettangian including ~25 kyrs of successional recovery before the terrestrial ecosystem had again stabilized.
AB - The Upper Triassic–Lower Jurassic succession in the Danish Basin is penetrated by many deep wells that were drilled during former hydrocarbon exploration campaignes but it is today targeted for geothermal energy and storage of CO2. In the Stenlille salt dome on Sjælland sandstones of the Gassum Formation, sealed by the overlying Fjerritslev Formation mudstones, have been used for decades as a seasonal storage for natural gas. With its comprehensive dataset of seismics, geophysical well logs and conventional core data from twenty wells, the Stenlille succession serves as a model for other salt domes currently evaluated as potential CO2 storage sites in the basins. Over the last decade the cored Triassic–Jurassic boundary (TJB) succession has contributed to the understanding of environmental and palynological events during the end-Triassic mass extinction. Core, sidewall core and cuttings samples from several of the closely situated Stenlille wells are here used for establishment of a high-resolution palynostratigraphic zonation scheme covering the entire Rhaetian to Sinemurian succession by integrating new analyses with previously published data. The palynological data set have allowed recognition of nine formally described spore-pollen zones of which eight are new, while two previously described dinoflagellate cysts zones are subdivided into 3 informal subzones each. The palynological zonation is integrated with a sequence stratigraphic framework and will form the basis for the dating of future well sections in the Danish Basin as well as other basins and for correlation to outcrops. The large palynological dataset further shows that the vegetation around the Danish Basin was remarkably stable during the early to middle Rhaetian, but that events related to the emplacement of the Central Atlantic Magmatic Province accelerated ecosystem changes during c. 175 kyrs in the late Rhaetian and earliest Hettangian including ~25 kyrs of successional recovery before the terrestrial ecosystem had again stabilized.
KW - Faculty of Science
KW - Triassic
KW - Jurassic
KW - Palynology
KW - biostratigraphy
KW - sequence stratigraphy
KW - spores
KW - pollen
KW - dinoflagellate cysts
KW - mass extinction
U2 - 10.1080/01916122.2023.2241068
DO - 10.1080/01916122.2023.2241068
M3 - Journal article
VL - 47
JO - Palynology
JF - Palynology
SN - 0191-6122
IS - 4
M1 - 2241068
ER -
ID: 360480152