Towards a robust and consistent middle Eocene astronomical timescale
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...
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ftopenunivgb:oai:oro.open.ac.uk:53035 2023-06-11T04:14:12+02:00 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 2018-03-15 application/pdf https://oro.open.ac.uk/53035/ https://oro.open.ac.uk/53035/1/Boulila%20etal%202018.pdf https://doi.org/10.1016/j.epsl.2018.01.003 unknown https://oro.open.ac.uk/53035/1/Boulila%20etal%202018.pdf Boulila, Slah; Vahlenkamp, Maximilian; De Vleeschouwer, David; Laskar, Jacques; Yamamoto, Yuhji; Pälike, Heiko; Kirtland-Turner, Sandra; Sexton, Philip F. <http://oro.open.ac.uk/view/person/pfs67.html>; Westerhold, Thomas and Röhl, Ursula (2018). Towards a robust and consistent middle Eocene astronomical timescale. Earth and Planetary Science Letters, 486 pp. 94–107. Journal Item OU Users Only PeerReviewed 2018 ftopenunivgb https://doi.org/10.1016/j.epsl.2018.01.003 2023-05-28T05:56:37Z 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 previous astronomical ... Article in Journal/Newspaper Newfoundland North Atlantic The Open University: Open Research Online (ORO) Earth and Planetary Science Letters 486 94 107 |
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Open Polar |
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The Open University: Open Research Online (ORO) |
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ftopenunivgb |
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unknown |
description |
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 previous astronomical ... |
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 |
spellingShingle |
Boulila, Slah Vahlenkamp, Maximilian De Vleeschouwer, David Laskar, Jacques Yamamoto, Yuhji Pälike, Heiko Kirtland-Turner, Sandra Sexton, Philip F. Westerhold, Thomas Röhl, Ursula Towards a robust and consistent middle Eocene astronomical timescale |
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 |
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 |
publishDate |
2018 |
url |
https://oro.open.ac.uk/53035/ https://oro.open.ac.uk/53035/1/Boulila%20etal%202018.pdf https://doi.org/10.1016/j.epsl.2018.01.003 |
genre |
Newfoundland North Atlantic |
genre_facet |
Newfoundland North Atlantic |
op_relation |
https://oro.open.ac.uk/53035/1/Boulila%20etal%202018.pdf Boulila, Slah; Vahlenkamp, Maximilian; De Vleeschouwer, David; Laskar, Jacques; Yamamoto, Yuhji; Pälike, Heiko; Kirtland-Turner, Sandra; Sexton, Philip F. <http://oro.open.ac.uk/view/person/pfs67.html>; Westerhold, Thomas and Röhl, Ursula (2018). Towards a robust and consistent middle Eocene astronomical timescale. Earth and Planetary Science Letters, 486 pp. 94–107. |
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_ |
1768392031940378624 |