The University of Southampton
University of Southampton Institutional Repository

A 17,000 yr paleomagnetic secular variation record from the southeast Alaskan margin: regional and global correlations

A 17,000 yr paleomagnetic secular variation record from the southeast Alaskan margin: regional and global correlations
A 17,000 yr paleomagnetic secular variation record from the southeast Alaskan margin: regional and global correlations
High-resolution sedimentary records on two cores from the Gulf of Alaska margin allow development of a ∼17,400-yr reconstruction of paleomagnetic secular variation (PSV). General agreement between the two records on their independent chronologies confirms that local PSV is recorded, demonstrating that such archives, notwithstanding complexities due to variable sedimentary regimes, deposition rates, and diagenetic conditions, provide meaningful information on past changes of the geomagnetic field. Comparisons with other independently dated sedimentary paleomagnetic records from the NE Pacific indicate largely coherent inclination records that in combination create a NE Pacific sedimentary inclination anomaly stack (NEPSIAS) capturing the common signal over an area spanning >30° longitude and latitude from Alaska through Oregon to Hawaii. Comparisons of NEPSIAS with high quality declination records from the northern North Atlantic (NNA) show that negative (shallow) inclination anomalies in NEPSIAS are associated with eastward NNA declinations while positive (steep) inclination anomalies in NEPSIAS are associated with westward NNA declinations. Comparison of these directional records to regional geomagnetic intensities over the past ∼3000 yrs in North America and back nearly 8000 yrs in the Euro/Mediterranean region, are consistent with a driving mechanism of oscillations in the relative strength of the North American and Euro/Mediterranean flux lobes. The persistence of these dynamics through the Holocene implicates a long-lived organizing structure likely imposed on the geomagnetic field by the lower mantle and/or inner core. These observations underscore a fundamental connection between directional PSV in the North Pacific with that of the North Atlantic, supporting the potential for long-distance correlation of directional PSV as a chronostratigraphic tool.
0012-821X
177-189
Walczak, M.H.
ecbd9635-8243-4ebd-b070-4a7fdab1c22c
Stoner, J.S.
07fdf2db-cd5b-4d16-a148-c3cf67a1aaf8
Mix, A.C.
070e95f7-e642-4331-9bc2-1450476e0d97
Jaeger, J.
476524b6-4212-4d8b-ad26-0a54b87d98e2
Rosen, G.P.
76041240-295f-4e54-8593-1597ae9085c5
Channell, J.E.T.
c9a5e943-adff-4f4a-963c-010b23eed69e
Heslop, D.
11d150c2-95ed-4403-be36-005242abe22c
Xuan, C.
3f3cad12-b17b-46ae-957a-b362def5b837
Walczak, M.H.
ecbd9635-8243-4ebd-b070-4a7fdab1c22c
Stoner, J.S.
07fdf2db-cd5b-4d16-a148-c3cf67a1aaf8
Mix, A.C.
070e95f7-e642-4331-9bc2-1450476e0d97
Jaeger, J.
476524b6-4212-4d8b-ad26-0a54b87d98e2
Rosen, G.P.
76041240-295f-4e54-8593-1597ae9085c5
Channell, J.E.T.
c9a5e943-adff-4f4a-963c-010b23eed69e
Heslop, D.
11d150c2-95ed-4403-be36-005242abe22c
Xuan, C.
3f3cad12-b17b-46ae-957a-b362def5b837

Walczak, M.H., Stoner, J.S., Mix, A.C., Jaeger, J., Rosen, G.P., Channell, J.E.T., Heslop, D. and Xuan, C. (2017) A 17,000 yr paleomagnetic secular variation record from the southeast Alaskan margin: regional and global correlations. Earth and Planetary Science Letters, 473, 177-189. (doi:10.1016/j.epsl.2017.05.022).

Record type: Article

Abstract

High-resolution sedimentary records on two cores from the Gulf of Alaska margin allow development of a ∼17,400-yr reconstruction of paleomagnetic secular variation (PSV). General agreement between the two records on their independent chronologies confirms that local PSV is recorded, demonstrating that such archives, notwithstanding complexities due to variable sedimentary regimes, deposition rates, and diagenetic conditions, provide meaningful information on past changes of the geomagnetic field. Comparisons with other independently dated sedimentary paleomagnetic records from the NE Pacific indicate largely coherent inclination records that in combination create a NE Pacific sedimentary inclination anomaly stack (NEPSIAS) capturing the common signal over an area spanning >30° longitude and latitude from Alaska through Oregon to Hawaii. Comparisons of NEPSIAS with high quality declination records from the northern North Atlantic (NNA) show that negative (shallow) inclination anomalies in NEPSIAS are associated with eastward NNA declinations while positive (steep) inclination anomalies in NEPSIAS are associated with westward NNA declinations. Comparison of these directional records to regional geomagnetic intensities over the past ∼3000 yrs in North America and back nearly 8000 yrs in the Euro/Mediterranean region, are consistent with a driving mechanism of oscillations in the relative strength of the North American and Euro/Mediterranean flux lobes. The persistence of these dynamics through the Holocene implicates a long-lived organizing structure likely imposed on the geomagnetic field by the lower mantle and/or inner core. These observations underscore a fundamental connection between directional PSV in the North Pacific with that of the North Atlantic, supporting the potential for long-distance correlation of directional PSV as a chronostratigraphic tool.

Text
Walczak_et_al._including_Xuan_2017_EPSL - Accepted Manuscript
Download (21MB)
Text
Walczak et al. including Xuan, 2017, EPSL (Accepted Manuscript)
Restricted to Repository staff only
Request a copy

More information

Accepted/In Press date: 16 May 2017
e-pub ahead of print date: 26 June 2017
Published date: 1 September 2017

Identifiers

Local EPrints ID: 413173
URI: http://eprints.soton.ac.uk/id/eprint/413173
ISSN: 0012-821X
PURE UUID: a9ce1403-f7f2-4b1e-bc94-1b9796790829
ORCID for C. Xuan: ORCID iD orcid.org/0000-0003-4043-3073

Catalogue record

Date deposited: 17 Aug 2017 16:30
Last modified: 18 Feb 2021 17:22

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.

×