The University of Southampton
University of Southampton Institutional Repository

Cyclostratigraphy and eccentricity tuning of the early Oligocene through early Miocene (30.1–17.1Ma): Cibicides mundulus stable oxygen and carbon isotope records from Walvis Ridge Site 1264

Cyclostratigraphy and eccentricity tuning of the early Oligocene through early Miocene (30.1–17.1Ma): Cibicides mundulus stable oxygen and carbon isotope records from Walvis Ridge Site 1264
Cyclostratigraphy and eccentricity tuning of the early Oligocene through early Miocene (30.1–17.1Ma): Cibicides mundulus stable oxygen and carbon isotope records from Walvis Ridge Site 1264
Few astronomically calibrated high-resolution (?5 kyr) climate records exist that span the Oligocene–Miocene time interval. Notably, available proxy records show responses varying in amplitude at frequencies related to astronomical forcing, and the main pacemakers of global change on astronomical time-scales remain debated. Here we present newly generated X-ray fluorescence core scanning and benthic foraminiferal stable oxygen and carbon isotope records from Ocean Drilling Program Site 1264 (Walvis Ridge, southeastern Atlantic Ocean). Complemented by data from nearby Site 1265, the Site 1264 benthic stable isotope records span a continuous ?13-Myr interval of the Oligo-Miocene (30.1–17.1 Ma) at high resolution (?3.0 kyr). Spectral analyses in the stratigraphic depth domain indicate that the largest amplitude variability of all proxy records is associated with periods of ?3.4 m?3.4 m and ?0.9 m?0.9 m, which correspond to 405- and ?110-kyr eccentricity, using a magnetobiostratigraphic age model. Maxima in CaCO3 content, ?18O and ?13C are interpreted to coincide with ?110 kyr eccentricity minima. The strong expression of these cycles in combination with the weakness of the precession- and obliquity-related signals allow construction of an astronomical age model that is solely based on tuning the CaCO3 content to the nominal (La2011_ecc3L) eccentricity solution. Very long-period eccentricity maxima (?2.4-Myr) are marked by recurrent episodes of high-amplitude ?110-kyr ?18O cycles at Walvis Ridge, indicating greater sensitivity of the climate/cryosphere system to short eccentricity modulation of climatic precession. In contrast, the responses of the global (high-latitude) climate system, cryosphere, and carbon cycle to the 405-kyr cycle, as expressed in benthic ?18O and especially ?13C signals, are more pronounced during ?2.4-Myr minima. The relationship between the recurrent episodes of high-amplitude ?110-kyr ?18O cycles and the ?1.2-Myr amplitude modulation of obliquity is not consistent through the Oligo-Miocene. Identification of these recurrent episodes at Walvis Ridge, and their pacing by the ?2.4-Myr eccentricity cycle, revises the current understanding of the main climate events of the Oligo-Miocene.
0012-821X
392-405
Liebrand, Diederik
bef7cbd7-4fa7-453c-9961-c950a5b87795
Beddow, Helen
8a5485c6-3644-41b1-a20b-52e8b7d6fdba
Lourens, Lucas
58c3cc1c-4983-4cd3-82c9-af60b2824ca1
Palike, Heiko
b9bf7798-ad8c-479b-8487-dd9a30a61fa5
Raffi, Isabella
ae99d733-dc7b-4580-95ee-f3426a6cfafb
Bohaty, Steven
af9dbe78-8b9f-44f2-ba1d-20795837d2d1
Hilgen, Frederik
9236e636-4ca1-4d73-bdec-c7eb62a85b61
Saes, Mischa
ba8f9f9c-467f-401a-99e8-edd2ac256835
Wilson, Paul A.
f940a9f0-fa5a-4a64-9061-f0794bfbf7c6
van Dijk, Arnold
64623fb7-5597-4961-ade8-acfd795624bf
Hodell, David
fa374377-1c67-459d-ab72-1e556012f3b1
Kroon, Dick
0b73c1aa-21fe-4d70-b46e-2a8e8a84abc7
Huck, Claire
c11ab07a-a14f-4703-b914-8dbabb38839c
Batenburg, Sietske
a90b3583-e59c-4e34-8bf0-acc542b7197e
Liebrand, Diederik
bef7cbd7-4fa7-453c-9961-c950a5b87795
Beddow, Helen
8a5485c6-3644-41b1-a20b-52e8b7d6fdba
Lourens, Lucas
58c3cc1c-4983-4cd3-82c9-af60b2824ca1
Palike, Heiko
b9bf7798-ad8c-479b-8487-dd9a30a61fa5
Raffi, Isabella
ae99d733-dc7b-4580-95ee-f3426a6cfafb
Bohaty, Steven
af9dbe78-8b9f-44f2-ba1d-20795837d2d1
Hilgen, Frederik
9236e636-4ca1-4d73-bdec-c7eb62a85b61
Saes, Mischa
ba8f9f9c-467f-401a-99e8-edd2ac256835
Wilson, Paul A.
f940a9f0-fa5a-4a64-9061-f0794bfbf7c6
van Dijk, Arnold
64623fb7-5597-4961-ade8-acfd795624bf
Hodell, David
fa374377-1c67-459d-ab72-1e556012f3b1
Kroon, Dick
0b73c1aa-21fe-4d70-b46e-2a8e8a84abc7
Huck, Claire
c11ab07a-a14f-4703-b914-8dbabb38839c
Batenburg, Sietske
a90b3583-e59c-4e34-8bf0-acc542b7197e

Liebrand, Diederik, Beddow, Helen, Lourens, Lucas, Palike, Heiko, Raffi, Isabella, Bohaty, Steven, Hilgen, Frederik, Saes, Mischa, Wilson, Paul A., van Dijk, Arnold, Hodell, David, Kroon, Dick, Huck, Claire and Batenburg, Sietske (2016) Cyclostratigraphy and eccentricity tuning of the early Oligocene through early Miocene (30.1–17.1Ma): Cibicides mundulus stable oxygen and carbon isotope records from Walvis Ridge Site 1264. Earth and Planetary Science Letters, 450, 392-405. (doi:10.1016/j.epsl.2016.06.007).

Record type: Article

Abstract

Few astronomically calibrated high-resolution (?5 kyr) climate records exist that span the Oligocene–Miocene time interval. Notably, available proxy records show responses varying in amplitude at frequencies related to astronomical forcing, and the main pacemakers of global change on astronomical time-scales remain debated. Here we present newly generated X-ray fluorescence core scanning and benthic foraminiferal stable oxygen and carbon isotope records from Ocean Drilling Program Site 1264 (Walvis Ridge, southeastern Atlantic Ocean). Complemented by data from nearby Site 1265, the Site 1264 benthic stable isotope records span a continuous ?13-Myr interval of the Oligo-Miocene (30.1–17.1 Ma) at high resolution (?3.0 kyr). Spectral analyses in the stratigraphic depth domain indicate that the largest amplitude variability of all proxy records is associated with periods of ?3.4 m?3.4 m and ?0.9 m?0.9 m, which correspond to 405- and ?110-kyr eccentricity, using a magnetobiostratigraphic age model. Maxima in CaCO3 content, ?18O and ?13C are interpreted to coincide with ?110 kyr eccentricity minima. The strong expression of these cycles in combination with the weakness of the precession- and obliquity-related signals allow construction of an astronomical age model that is solely based on tuning the CaCO3 content to the nominal (La2011_ecc3L) eccentricity solution. Very long-period eccentricity maxima (?2.4-Myr) are marked by recurrent episodes of high-amplitude ?110-kyr ?18O cycles at Walvis Ridge, indicating greater sensitivity of the climate/cryosphere system to short eccentricity modulation of climatic precession. In contrast, the responses of the global (high-latitude) climate system, cryosphere, and carbon cycle to the 405-kyr cycle, as expressed in benthic ?18O and especially ?13C signals, are more pronounced during ?2.4-Myr minima. The relationship between the recurrent episodes of high-amplitude ?110-kyr ?18O cycles and the ?1.2-Myr amplitude modulation of obliquity is not consistent through the Oligo-Miocene. Identification of these recurrent episodes at Walvis Ridge, and their pacing by the ?2.4-Myr eccentricity cycle, revises the current understanding of the main climate events of the Oligo-Miocene.

Text
Liebrand et al, 2016, EPSL, REF.pdf - Accepted Manuscript
Download (5MB)
Text
Liebrand et al., 2016, EPSL.pdf - Version of Record
Download (5MB)
Text
mmc1.pdf - Version of Record
Download (1MB)

More information

Accepted/In Press date: 5 June 2016
e-pub ahead of print date: 30 June 2016
Published date: 15 September 2016
Organisations: Paleooceanography & Palaeoclimate

Identifiers

Local EPrints ID: 398862
URI: http://eprints.soton.ac.uk/id/eprint/398862
ISSN: 0012-821X
PURE UUID: c779fa7b-c477-4a61-8646-a43af3c2724f
ORCID for Steven Bohaty: ORCID iD orcid.org/0000-0002-1193-7398

Catalogue record

Date deposited: 03 Aug 2016 12:38
Last modified: 18 Feb 2021 17:08

Export record

Altmetrics

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×