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Cyclostratigraphy and astronomical tuning of the Late Maastrichtian at Zumaia (Basque country, Northern Spain)

Cyclostratigraphy and astronomical tuning of the Late Maastrichtian at Zumaia (Basque country, Northern Spain)
Cyclostratigraphy and astronomical tuning of the Late Maastrichtian at Zumaia (Basque country, Northern Spain)
The standard Geological Time Scale for the Cretaceous is still largely based on seafloor anomaly profiles combined with radio-isotopic tie-points. The astronomical tuned time scale with its much higher resolution and accuracy has recently been extended to the K/Pg-boundary and is being extended into the Cretaceous. To construct such a time scale for the Cretaceous, we selected the upper Maastrichtian of the Zumaia section in the Basque country (northern Spain) which contains a cyclic alternation of limestones and marls deposited in a hemipelagic setting. The Paleogene portion of the Zumaia section has previously been studied for a joint cyclostratigraphic–radioisotopic intercalibration of the age of the K/Pg boundary. Here we present a high-resolution cyclostratigraphic framework for the upper Maastrichtian (Latest Cretaceous) of the Zumaia section in the Basque country (northern Spain), with new biostratigraphic and magnetostratigraphic data. Bed-to-bed correlation with the nearby Sopelana section provides additional bio- and magnetostratigraphic constraints. The stacking pattern of the lithologies shows a hierarchy that reflects the combined influence of the orbital parameters of precession and eccentricity. This is confirmed by time series analyses of lithological and geochemical data, indicating a strong influence of eccentricity-modulated precession on latest Cretaceous climate. The expression of the 405-kyr eccentricity cycle serves as primary signal for astronomical tuning. We provide two tuning options depending on absolute K/Pg-boundary ages of 65.56 and 65.97 Ma. The logged part of the section encompasses nine and a half 405-kyr cycles in total and spans 3.9 Myr. The acquired cyclostratigraphic framework provides ages for characteristic planktonic foraminiferal events, magnetic reversals and carbon isotope excursions and resolves the late Maastrichtian time scale in unprecedented detail with relative age uncertainties <100 kyr. The high resolution and large amplitude of shifts in ?13C on the 405-kyr and 1.2-Myr scales allow for global correlation and may shed more light on the orbital pacing of Late Cretaceous climate.
cyclostratigraphy, orbital tuning, astronomical time scale, Late Cretaceous, magnetostratigraphy, carbon isotope stratigraphy
0012-821X
264-278
Batenburg, Sietske J.
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Sprovieri, Mario
28ef1327-5ab6-4567-8129-981a7195da89
Gale, Andrew S.
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Hilgen, Frederik J.
afa55c8c-67ff-47c9-b1c7-d1f50cc2e253
Hüsing, Silja
3ca7d99a-684e-4b27-9491-681b30344c92
Laskar, Jacques
e8c93d35-c751-4939-aaa6-5288fb841415
Liebrand, Diederik
bef7cbd7-4fa7-453c-9961-c950a5b87795
Lirer, Fabrizio
7537e77e-2f4b-43f1-93b6-6d8d9e559ed4
Orue-Etxebarria, Xabier
abcfa29b-a23c-4111-99ee-edadaa81e5ac
Pelosi, Nicola
19baef26-06ea-4cd0-9e49-9de38fe76adc
Smit, Jan
3fd29a5b-b523-43b7-add1-42a37a0d672b
Batenburg, Sietske J.
5f05bc69-6654-4673-8279-30e5ae762726
Sprovieri, Mario
28ef1327-5ab6-4567-8129-981a7195da89
Gale, Andrew S.
590a0d69-40c1-4841-a57c-7968174a1278
Hilgen, Frederik J.
afa55c8c-67ff-47c9-b1c7-d1f50cc2e253
Hüsing, Silja
3ca7d99a-684e-4b27-9491-681b30344c92
Laskar, Jacques
e8c93d35-c751-4939-aaa6-5288fb841415
Liebrand, Diederik
bef7cbd7-4fa7-453c-9961-c950a5b87795
Lirer, Fabrizio
7537e77e-2f4b-43f1-93b6-6d8d9e559ed4
Orue-Etxebarria, Xabier
abcfa29b-a23c-4111-99ee-edadaa81e5ac
Pelosi, Nicola
19baef26-06ea-4cd0-9e49-9de38fe76adc
Smit, Jan
3fd29a5b-b523-43b7-add1-42a37a0d672b

Batenburg, Sietske J., Sprovieri, Mario, Gale, Andrew S., Hilgen, Frederik J., Hüsing, Silja, Laskar, Jacques, Liebrand, Diederik, Lirer, Fabrizio, Orue-Etxebarria, Xabier, Pelosi, Nicola and Smit, Jan (2012) Cyclostratigraphy and astronomical tuning of the Late Maastrichtian at Zumaia (Basque country, Northern Spain). Earth and Planetary Science Letters, 359-360, 264-278. (doi:10.1016/j.epsl.2012.09.054).

Record type: Article

Abstract

The standard Geological Time Scale for the Cretaceous is still largely based on seafloor anomaly profiles combined with radio-isotopic tie-points. The astronomical tuned time scale with its much higher resolution and accuracy has recently been extended to the K/Pg-boundary and is being extended into the Cretaceous. To construct such a time scale for the Cretaceous, we selected the upper Maastrichtian of the Zumaia section in the Basque country (northern Spain) which contains a cyclic alternation of limestones and marls deposited in a hemipelagic setting. The Paleogene portion of the Zumaia section has previously been studied for a joint cyclostratigraphic–radioisotopic intercalibration of the age of the K/Pg boundary. Here we present a high-resolution cyclostratigraphic framework for the upper Maastrichtian (Latest Cretaceous) of the Zumaia section in the Basque country (northern Spain), with new biostratigraphic and magnetostratigraphic data. Bed-to-bed correlation with the nearby Sopelana section provides additional bio- and magnetostratigraphic constraints. The stacking pattern of the lithologies shows a hierarchy that reflects the combined influence of the orbital parameters of precession and eccentricity. This is confirmed by time series analyses of lithological and geochemical data, indicating a strong influence of eccentricity-modulated precession on latest Cretaceous climate. The expression of the 405-kyr eccentricity cycle serves as primary signal for astronomical tuning. We provide two tuning options depending on absolute K/Pg-boundary ages of 65.56 and 65.97 Ma. The logged part of the section encompasses nine and a half 405-kyr cycles in total and spans 3.9 Myr. The acquired cyclostratigraphic framework provides ages for characteristic planktonic foraminiferal events, magnetic reversals and carbon isotope excursions and resolves the late Maastrichtian time scale in unprecedented detail with relative age uncertainties <100 kyr. The high resolution and large amplitude of shifts in ?13C on the 405-kyr and 1.2-Myr scales allow for global correlation and may shed more light on the orbital pacing of Late Cretaceous climate.

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Published date: 15 December 2012
Keywords: cyclostratigraphy, orbital tuning, astronomical time scale, Late Cretaceous, magnetostratigraphy, carbon isotope stratigraphy
Organisations: Ocean and Earth Science

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Local EPrints ID: 347996
URI: https://eprints.soton.ac.uk/id/eprint/347996
ISSN: 0012-821X
PURE UUID: a3451ba2-d579-48dc-a9d8-605a5f1267c8

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Date deposited: 05 Feb 2013 11:49
Last modified: 16 Jul 2019 21:44

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Contributors

Author: Sietske J. Batenburg
Author: Mario Sprovieri
Author: Andrew S. Gale
Author: Frederik J. Hilgen
Author: Silja Hüsing
Author: Jacques Laskar
Author: Diederik Liebrand
Author: Fabrizio Lirer
Author: Xabier Orue-Etxebarria
Author: Nicola Pelosi
Author: Jan Smit

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