Sequence stratigraphy and microplankton palaeoenvironmental dynamics across the Jurassic–Cretaceous transition in the Canadian Arctic
ABSTRACT The Jurassic to Cretaceous strata exposed in the Rollrock Section, Sverdrup Basin, Arctic Canada, represent one of the northernmost continuous outcrops spanning this poorly understood transition. The Oxfordian–Valanginian mudstones of the Rollrock Section were deposited in a shallow marine...
Published in: | Earth and Environmental Science Transactions of the Royal Society of Edinburgh |
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Language: | English |
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Cambridge University Press (CUP)
2022
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Online Access: | http://dx.doi.org/10.1017/s1755691022000081 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S1755691022000081 |
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crcambridgeupr:10.1017/s1755691022000081 2023-05-15T14:59:25+02:00 Sequence stratigraphy and microplankton palaeoenvironmental dynamics across the Jurassic–Cretaceous transition in the Canadian Arctic INGRAMS, Stephen JOLLEY, David W. SCHNEIDER, Simon 2022 http://dx.doi.org/10.1017/s1755691022000081 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S1755691022000081 en eng Cambridge University Press (CUP) https://creativecommons.org/licenses/by/4.0/ CC-BY Earth and Environmental Science Transactions of the Royal Society of Edinburgh volume 113, issue 3, page 159-174 ISSN 1755-6910 1755-6929 General Earth and Planetary Sciences General Environmental Science journal-article 2022 crcambridgeupr https://doi.org/10.1017/s1755691022000081 2023-01-20T07:08:42Z ABSTRACT The Jurassic to Cretaceous strata exposed in the Rollrock Section, Sverdrup Basin, Arctic Canada, represent one of the northernmost continuous outcrops spanning this poorly understood transition. The Oxfordian–Valanginian mudstones of the Rollrock Section were deposited in a shallow marine environment and, as such, provide the ideal lithology to investigate the response of high latitude dinoflagellate cyst populations to the frequent environmental perturbations of this time. Using a multivariate statistical approach, distinct palaeoecologically significant groups are identified and directly linked to time and palaeoenvironments, allowing for the reconstruction of underlying long term palaeoenvironmental trends. These palaeoenvironmental trends are identified to be driven by sequence stratigraphic cycles. For the first time, fourth order sequences are recorded from this pivotal period in the Sverdrup Basin and reveal an additional level of short term climatic events that complicate the identification of long term trends. The relationship existing between marine phytoplankton and climate is utilised to decipher the interplay of long-term and short-term climate fluctuations, distinguishing them from evolutionary trends. Two groups of dinoflagellate cysts, identified by process morphology, are recorded to act as environmental proxies. High percentages of proximochorate dinoflagellate cysts, such as Trichodinium erinaceoides , indicate more proximal, high energy, nutrient rich conditions and are dominant in fourth order transgressive systems tracts. High percentages of chorate dinoflagellate cysts, such as Oligosphaeridium complex , signify distal, low energy, nutrient depleted conditions and are dominant in fourth order highstand systems tracts. Article in Journal/Newspaper Arctic Phytoplankton sverdrup basin Cambridge University Press (via Crossref) Arctic Canada Earth and Environmental Science Transactions of the Royal Society of Edinburgh 1 16 |
institution |
Open Polar |
collection |
Cambridge University Press (via Crossref) |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
General Earth and Planetary Sciences General Environmental Science |
spellingShingle |
General Earth and Planetary Sciences General Environmental Science INGRAMS, Stephen JOLLEY, David W. SCHNEIDER, Simon Sequence stratigraphy and microplankton palaeoenvironmental dynamics across the Jurassic–Cretaceous transition in the Canadian Arctic |
topic_facet |
General Earth and Planetary Sciences General Environmental Science |
description |
ABSTRACT The Jurassic to Cretaceous strata exposed in the Rollrock Section, Sverdrup Basin, Arctic Canada, represent one of the northernmost continuous outcrops spanning this poorly understood transition. The Oxfordian–Valanginian mudstones of the Rollrock Section were deposited in a shallow marine environment and, as such, provide the ideal lithology to investigate the response of high latitude dinoflagellate cyst populations to the frequent environmental perturbations of this time. Using a multivariate statistical approach, distinct palaeoecologically significant groups are identified and directly linked to time and palaeoenvironments, allowing for the reconstruction of underlying long term palaeoenvironmental trends. These palaeoenvironmental trends are identified to be driven by sequence stratigraphic cycles. For the first time, fourth order sequences are recorded from this pivotal period in the Sverdrup Basin and reveal an additional level of short term climatic events that complicate the identification of long term trends. The relationship existing between marine phytoplankton and climate is utilised to decipher the interplay of long-term and short-term climate fluctuations, distinguishing them from evolutionary trends. Two groups of dinoflagellate cysts, identified by process morphology, are recorded to act as environmental proxies. High percentages of proximochorate dinoflagellate cysts, such as Trichodinium erinaceoides , indicate more proximal, high energy, nutrient rich conditions and are dominant in fourth order transgressive systems tracts. High percentages of chorate dinoflagellate cysts, such as Oligosphaeridium complex , signify distal, low energy, nutrient depleted conditions and are dominant in fourth order highstand systems tracts. |
format |
Article in Journal/Newspaper |
author |
INGRAMS, Stephen JOLLEY, David W. SCHNEIDER, Simon |
author_facet |
INGRAMS, Stephen JOLLEY, David W. SCHNEIDER, Simon |
author_sort |
INGRAMS, Stephen |
title |
Sequence stratigraphy and microplankton palaeoenvironmental dynamics across the Jurassic–Cretaceous transition in the Canadian Arctic |
title_short |
Sequence stratigraphy and microplankton palaeoenvironmental dynamics across the Jurassic–Cretaceous transition in the Canadian Arctic |
title_full |
Sequence stratigraphy and microplankton palaeoenvironmental dynamics across the Jurassic–Cretaceous transition in the Canadian Arctic |
title_fullStr |
Sequence stratigraphy and microplankton palaeoenvironmental dynamics across the Jurassic–Cretaceous transition in the Canadian Arctic |
title_full_unstemmed |
Sequence stratigraphy and microplankton palaeoenvironmental dynamics across the Jurassic–Cretaceous transition in the Canadian Arctic |
title_sort |
sequence stratigraphy and microplankton palaeoenvironmental dynamics across the jurassic–cretaceous transition in the canadian arctic |
publisher |
Cambridge University Press (CUP) |
publishDate |
2022 |
url |
http://dx.doi.org/10.1017/s1755691022000081 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S1755691022000081 |
geographic |
Arctic Canada |
geographic_facet |
Arctic Canada |
genre |
Arctic Phytoplankton sverdrup basin |
genre_facet |
Arctic Phytoplankton sverdrup basin |
op_source |
Earth and Environmental Science Transactions of the Royal Society of Edinburgh volume 113, issue 3, page 159-174 ISSN 1755-6910 1755-6929 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1017/s1755691022000081 |
container_title |
Earth and Environmental Science Transactions of the Royal Society of Edinburgh |
container_start_page |
1 |
op_container_end_page |
16 |
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1766331532271681536 |