Magnetostratigraphy of U-Pb–dated boreholes in Svalbard, Norway, implies that magnetochron M0r (a proposed Barremian-Aptian boundary marker) begins at 121.2 ± 0.4 Ma
The age of the beginning of magnetic polarity Chron M0r, a proposed marker for the base of the Aptian Stage, is disputed due to a divergence of published radioisotopic dates and ambiguities in stratigraphic correlation of sections. Our magnetostratigraphy of core DH1 from Svalbard, Norway, calibrate...
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ftulancaster:oai:eprints.lancs.ac.uk:155922 2023-08-27T04:12:17+02:00 Magnetostratigraphy of U-Pb–dated boreholes in Svalbard, Norway, implies that magnetochron M0r (a proposed Barremian-Aptian boundary marker) begins at 121.2 ± 0.4 Ma Zhang, Yang Ogg, J. G. Minguez, Daniel Hounslow, Mark W Olaussen, Snorre Gradstein, Felix M. Esmeray-Senlet, Selen 2021-06-01 https://eprints.lancs.ac.uk/id/eprint/155922/ https://doi.org/10.1130/G48591.1 unknown Zhang, Yang and Ogg, J. G. and Minguez, Daniel and Hounslow, Mark W and Olaussen, Snorre and Gradstein, Felix M. and Esmeray-Senlet, Selen (2021) Magnetostratigraphy of U-Pb–dated boreholes in Svalbard, Norway, implies that magnetochron M0r (a proposed Barremian-Aptian boundary marker) begins at 121.2 ± 0.4 Ma. Geology, 49 (6). pp. 733-737. ISSN 0091-7613 Journal Article PeerReviewed 2021 ftulancaster https://doi.org/10.1130/G48591.1 2023-08-03T22:39:54Z The age of the beginning of magnetic polarity Chron M0r, a proposed marker for the base of the Aptian Stage, is disputed due to a divergence of published radioisotopic dates and ambiguities in stratigraphic correlation of sections. Our magnetostratigraphy of core DH1 from Svalbard, Norway, calibrates a bentonite bed, dated by U-Pb methods to 123.1 ± 0.3 Ma, to the uppermost part of magnetozone M1r, which is ∼1.9 m.y. before the beginning of Chron M0r. This is the first direct calibration of any high-precision radioisotopic date to a polarity chron of the M sequence. The interpolated age of 121.2 ± 0.4 Ma for the beginning of Chron M0r is younger by ∼5 m.y. than its estimated age used in the Geologic Time Scale 2012, which had been extrapolated from radioisotopic dates on oceanic basalts and from Aptian cyclostratigraphy. The adjusted age model implies a commensurate faster average global oceanic spreading rate of ∼12% during the Aptian–Santonian interval. Future radioisotopic dating and high-resolution cyclostratigraphy are needed to investigate where to expand the mid-Jurassic to earliest Cretaceous interval by the required ∼4 m.y. Article in Journal/Newspaper Svalbard Lancaster University: Lancaster Eprints Norway Svalbard Geology 49 6 733 737 |
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Lancaster University: Lancaster Eprints |
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ftulancaster |
language |
unknown |
description |
The age of the beginning of magnetic polarity Chron M0r, a proposed marker for the base of the Aptian Stage, is disputed due to a divergence of published radioisotopic dates and ambiguities in stratigraphic correlation of sections. Our magnetostratigraphy of core DH1 from Svalbard, Norway, calibrates a bentonite bed, dated by U-Pb methods to 123.1 ± 0.3 Ma, to the uppermost part of magnetozone M1r, which is ∼1.9 m.y. before the beginning of Chron M0r. This is the first direct calibration of any high-precision radioisotopic date to a polarity chron of the M sequence. The interpolated age of 121.2 ± 0.4 Ma for the beginning of Chron M0r is younger by ∼5 m.y. than its estimated age used in the Geologic Time Scale 2012, which had been extrapolated from radioisotopic dates on oceanic basalts and from Aptian cyclostratigraphy. The adjusted age model implies a commensurate faster average global oceanic spreading rate of ∼12% during the Aptian–Santonian interval. Future radioisotopic dating and high-resolution cyclostratigraphy are needed to investigate where to expand the mid-Jurassic to earliest Cretaceous interval by the required ∼4 m.y. |
format |
Article in Journal/Newspaper |
author |
Zhang, Yang Ogg, J. G. Minguez, Daniel Hounslow, Mark W Olaussen, Snorre Gradstein, Felix M. Esmeray-Senlet, Selen |
spellingShingle |
Zhang, Yang Ogg, J. G. Minguez, Daniel Hounslow, Mark W Olaussen, Snorre Gradstein, Felix M. Esmeray-Senlet, Selen Magnetostratigraphy of U-Pb–dated boreholes in Svalbard, Norway, implies that magnetochron M0r (a proposed Barremian-Aptian boundary marker) begins at 121.2 ± 0.4 Ma |
author_facet |
Zhang, Yang Ogg, J. G. Minguez, Daniel Hounslow, Mark W Olaussen, Snorre Gradstein, Felix M. Esmeray-Senlet, Selen |
author_sort |
Zhang, Yang |
title |
Magnetostratigraphy of U-Pb–dated boreholes in Svalbard, Norway, implies that magnetochron M0r (a proposed Barremian-Aptian boundary marker) begins at 121.2 ± 0.4 Ma |
title_short |
Magnetostratigraphy of U-Pb–dated boreholes in Svalbard, Norway, implies that magnetochron M0r (a proposed Barremian-Aptian boundary marker) begins at 121.2 ± 0.4 Ma |
title_full |
Magnetostratigraphy of U-Pb–dated boreholes in Svalbard, Norway, implies that magnetochron M0r (a proposed Barremian-Aptian boundary marker) begins at 121.2 ± 0.4 Ma |
title_fullStr |
Magnetostratigraphy of U-Pb–dated boreholes in Svalbard, Norway, implies that magnetochron M0r (a proposed Barremian-Aptian boundary marker) begins at 121.2 ± 0.4 Ma |
title_full_unstemmed |
Magnetostratigraphy of U-Pb–dated boreholes in Svalbard, Norway, implies that magnetochron M0r (a proposed Barremian-Aptian boundary marker) begins at 121.2 ± 0.4 Ma |
title_sort |
magnetostratigraphy of u-pb–dated boreholes in svalbard, norway, implies that magnetochron m0r (a proposed barremian-aptian boundary marker) begins at 121.2 ± 0.4 ma |
publishDate |
2021 |
url |
https://eprints.lancs.ac.uk/id/eprint/155922/ https://doi.org/10.1130/G48591.1 |
geographic |
Norway Svalbard |
geographic_facet |
Norway Svalbard |
genre |
Svalbard |
genre_facet |
Svalbard |
op_relation |
Zhang, Yang and Ogg, J. G. and Minguez, Daniel and Hounslow, Mark W and Olaussen, Snorre and Gradstein, Felix M. and Esmeray-Senlet, Selen (2021) Magnetostratigraphy of U-Pb–dated boreholes in Svalbard, Norway, implies that magnetochron M0r (a proposed Barremian-Aptian boundary marker) begins at 121.2 ± 0.4 Ma. Geology, 49 (6). pp. 733-737. ISSN 0091-7613 |
op_doi |
https://doi.org/10.1130/G48591.1 |
container_title |
Geology |
container_volume |
49 |
container_issue |
6 |
container_start_page |
733 |
op_container_end_page |
737 |
_version_ |
1775356265281617920 |