Towards a robust and consistent middle Eocene astronomical timescale
International audience Until now, the middle Eocene has remained a poorly constrained interval of efforts to produce an astrochronological timescale for the entire Cenozoic. This has given rise to a so-called "Eocene astronomical timescale gap" (Vandenberghe et al., 2012). A high-resolutio...
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ftobservparis:oai:HAL:hal-02320009v1 2024-06-23T07:54:45+00:00 Towards a robust and consistent middle Eocene astronomical timescale Boulila, Slah Vahlenkamp, Maximilian de Vleeschouwer, David Laskar, Jacques Yamamoto, Yuhji Pälike, Heiko Kirtland Turner, Sandra Sexton, Philip F. Westerhold, Thomas Röhl, Ursula Sexton, Philip Institut des Sciences de la Terre de Paris (iSTeP) Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS) Center for Marine Environmental Sciences Bremen (MARUM) Universität Bremen Institut de Mécanique Céleste et de Calcul des Ephémérides (IMCCE) Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université de Lille-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) School of Environment, Earth and Ecosystem Sciences Milton Keynes Faculty of Science, Technology, Engineering and Mathematics Milton Keynes The Open University Milton Keynes (OU)-The Open University Milton Keynes (OU) 2018-03 https://hal.science/hal-02320009 https://doi.org/10.1016/j.epsl.2018.01.003 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.epsl.2018.01.003 hal-02320009 https://hal.science/hal-02320009 BIBCODE: 2018E&PSL.486.94B doi:10.1016/j.epsl.2018.01.003 ISSN: 0012-821X Earth and Planetary Science Letters https://hal.science/hal-02320009 Earth and Planetary Science Letters, 2018, 486, pp.94-107. ⟨10.1016/j.epsl.2018.01.003⟩ Middle Eocene Newfoundland Ridge obliquity s3-s6 modulation cycle astronomical timescale [PHYS]Physics [physics] [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] info:eu-repo/semantics/article Journal articles 2018 ftobservparis https://doi.org/10.1016/j.epsl.2018.01.003 2024-06-04T00:02:44Z International audience Until now, the middle Eocene has remained a poorly constrained interval of efforts to produce an astrochronological timescale for the entire Cenozoic. This has given rise to a so-called "Eocene astronomical timescale gap" (Vandenberghe et al., 2012). A high-resolution astrochronological calibration for this interval has proven to be difficult to realize, mainly because carbonate-rich deep-marine sequences of this age are scarce. In this paper, we present records from middle Eocene carbonate-rich sequences from the North Atlantic Southeast Newfoundland Ridge (IODP Exp. 342, Sites U1408 and U1410), of which the cyclical sedimentary patterns allow for an orbital calibration of the geologic timescale between ∼38 and ∼48 Ma. These carbonate-rich cyclic sediments at Sites U1408 and U1410 were deposited as drift deposits and exhibit prominent lithological alternations (couplets) between greenish nannofossil-rich clay and white nannofossil ooze. The principal lithological couplet is driven by the obliquity of Earth's axial tilt, and the intensity of their expression is modulated by a cyclicity of about 173 kyr. This cyclicity corresponds to the interference of secular frequencies s3 and s6 (related to the precession of nodes of the Earth and Saturn, respectively). This 173-kyr obliquity amplitude modulation cycle is exceptionally well recorded in the XRF (X-ray fluorescence)-derived Ca/Fe ratio. In this work, we first demonstrate the stability of the (s3-s6) cycles using the latest astronomical solutions. Results show that this orbital component is stable back to at least 50 Ma, and can thus serve as a powerful geochronometer in the mid-Eocene portion of the Cenozoic timescale. We then exploit this potential by calibrating the geochronology of the recovered middle Eocene timescale between magnetic polarity Chrons C18n.1n and C21n. Comparison with previous timescales shows similarities, but also notable differences in durations of certain magnetic polarity chrons. We present a revision of ... Article in Journal/Newspaper Newfoundland North Atlantic Archive de l'Observatoire de Paris (HAL) Earth and Planetary Science Letters 486 94 107 |
institution |
Open Polar |
collection |
Archive de l'Observatoire de Paris (HAL) |
op_collection_id |
ftobservparis |
language |
English |
topic |
Middle Eocene Newfoundland Ridge obliquity s3-s6 modulation cycle astronomical timescale [PHYS]Physics [physics] [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] |
spellingShingle |
Middle Eocene Newfoundland Ridge obliquity s3-s6 modulation cycle astronomical timescale [PHYS]Physics [physics] [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] Boulila, Slah Vahlenkamp, Maximilian de Vleeschouwer, David Laskar, Jacques Yamamoto, Yuhji Pälike, Heiko Kirtland Turner, Sandra Sexton, Philip F. Westerhold, Thomas Röhl, Ursula Sexton, Philip Towards a robust and consistent middle Eocene astronomical timescale |
topic_facet |
Middle Eocene Newfoundland Ridge obliquity s3-s6 modulation cycle astronomical timescale [PHYS]Physics [physics] [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] |
description |
International audience Until now, the middle Eocene has remained a poorly constrained interval of efforts to produce an astrochronological timescale for the entire Cenozoic. This has given rise to a so-called "Eocene astronomical timescale gap" (Vandenberghe et al., 2012). A high-resolution astrochronological calibration for this interval has proven to be difficult to realize, mainly because carbonate-rich deep-marine sequences of this age are scarce. In this paper, we present records from middle Eocene carbonate-rich sequences from the North Atlantic Southeast Newfoundland Ridge (IODP Exp. 342, Sites U1408 and U1410), of which the cyclical sedimentary patterns allow for an orbital calibration of the geologic timescale between ∼38 and ∼48 Ma. These carbonate-rich cyclic sediments at Sites U1408 and U1410 were deposited as drift deposits and exhibit prominent lithological alternations (couplets) between greenish nannofossil-rich clay and white nannofossil ooze. The principal lithological couplet is driven by the obliquity of Earth's axial tilt, and the intensity of their expression is modulated by a cyclicity of about 173 kyr. This cyclicity corresponds to the interference of secular frequencies s3 and s6 (related to the precession of nodes of the Earth and Saturn, respectively). This 173-kyr obliquity amplitude modulation cycle is exceptionally well recorded in the XRF (X-ray fluorescence)-derived Ca/Fe ratio. In this work, we first demonstrate the stability of the (s3-s6) cycles using the latest astronomical solutions. Results show that this orbital component is stable back to at least 50 Ma, and can thus serve as a powerful geochronometer in the mid-Eocene portion of the Cenozoic timescale. We then exploit this potential by calibrating the geochronology of the recovered middle Eocene timescale between magnetic polarity Chrons C18n.1n and C21n. Comparison with previous timescales shows similarities, but also notable differences in durations of certain magnetic polarity chrons. We present a revision of ... |
author2 |
Institut des Sciences de la Terre de Paris (iSTeP) Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS) Center for Marine Environmental Sciences Bremen (MARUM) Universität Bremen Institut de Mécanique Céleste et de Calcul des Ephémérides (IMCCE) Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université de Lille-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) School of Environment, Earth and Ecosystem Sciences Milton Keynes Faculty of Science, Technology, Engineering and Mathematics Milton Keynes The Open University Milton Keynes (OU)-The Open University Milton Keynes (OU) |
format |
Article in Journal/Newspaper |
author |
Boulila, Slah Vahlenkamp, Maximilian de Vleeschouwer, David Laskar, Jacques Yamamoto, Yuhji Pälike, Heiko Kirtland Turner, Sandra Sexton, Philip F. Westerhold, Thomas Röhl, Ursula Sexton, Philip |
author_facet |
Boulila, Slah Vahlenkamp, Maximilian de Vleeschouwer, David Laskar, Jacques Yamamoto, Yuhji Pälike, Heiko Kirtland Turner, Sandra Sexton, Philip F. Westerhold, Thomas Röhl, Ursula Sexton, Philip |
author_sort |
Boulila, Slah |
title |
Towards a robust and consistent middle Eocene astronomical timescale |
title_short |
Towards a robust and consistent middle Eocene astronomical timescale |
title_full |
Towards a robust and consistent middle Eocene astronomical timescale |
title_fullStr |
Towards a robust and consistent middle Eocene astronomical timescale |
title_full_unstemmed |
Towards a robust and consistent middle Eocene astronomical timescale |
title_sort |
towards a robust and consistent middle eocene astronomical timescale |
publisher |
HAL CCSD |
publishDate |
2018 |
url |
https://hal.science/hal-02320009 https://doi.org/10.1016/j.epsl.2018.01.003 |
genre |
Newfoundland North Atlantic |
genre_facet |
Newfoundland North Atlantic |
op_source |
ISSN: 0012-821X Earth and Planetary Science Letters https://hal.science/hal-02320009 Earth and Planetary Science Letters, 2018, 486, pp.94-107. ⟨10.1016/j.epsl.2018.01.003⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.epsl.2018.01.003 hal-02320009 https://hal.science/hal-02320009 BIBCODE: 2018E&PSL.486.94B doi:10.1016/j.epsl.2018.01.003 |
op_doi |
https://doi.org/10.1016/j.epsl.2018.01.003 |
container_title |
Earth and Planetary Science Letters |
container_volume |
486 |
container_start_page |
94 |
op_container_end_page |
107 |
_version_ |
1802647025931517952 |