The University of Southampton
University of Southampton Institutional Repository

Extracting a detailed magnetostratigraphy from weakly magnetized, Oligocene to early Miocene sediment drifts recovered at IODP Site U1406 (Newfoundland margin, northwest Atlantic Ocean)

Extracting a detailed magnetostratigraphy from weakly magnetized, Oligocene to early Miocene sediment drifts recovered at IODP Site U1406 (Newfoundland margin, northwest Atlantic Ocean)
Extracting a detailed magnetostratigraphy from weakly magnetized, Oligocene to early Miocene sediment drifts recovered at IODP Site U1406 (Newfoundland margin, northwest Atlantic Ocean)
Fine-grained magnetic particles in deep-sea sediments often statistically align with the ambient magnetic field during (and shortly after) deposition and can therefore record geomagnetic reversals. Correlation of these reversals to a geomagnetic polarity time scale is an important geochronological tool that facilitates precise stratigraphic correlation and dating of geological records globally. Sediments often carry a remanence strong enough for confident identification of polarity reversals, but in some cases a low signal-to-noise ratio prevents the construction of a reliable and robust magnetostratigraphy. Here we implement a data-filtering protocol, which can be integrated with the UPmag software package, to automatically reduce the maximum angular deviation and statistically mask noisy data and outliers deemed unsuitable for magnetostratigraphic interpretation. This protocol thus extracts a clearer signal from weakly magnetized sediments recovered at Integrated Ocean Drilling Program (IODP) Expedition 342 Site U1406 (Newfoundland margin, northwest Atlantic Ocean). The resulting magnetostratigraphy, in combination with shipboard and shore-based biostratigraphy, provides an age model for the study interval from IODP Site U1406 between Chrons C6Ar and C9n (∼21-27 Ma). We identify rarely observed geomagnetic directional changes within Chrons C6Br, C7r, and C7Ar, and perhaps within Subchron C8n.1n. Our magnetostratigraphy dates three intervals of unusual stratigraphic behavior within the sediment drifts at IODP Site U1406 on the Newfoundland margin. These lithostratigraphic changes are broadly concurrent with the coldest climatic phases of the middle Oligocene to early Miocene and we hypothesize that they reflect changes in bottom-water circulation.
1525-2027
Van Peer, Tim E.
da231293-36c0-4d9f-b86c-8b1f059b5134
Xuan, Chuang
3f3cad12-b17b-46ae-957a-b362def5b837
Lippert, Peter C.
65409dec-6fd8-455e-8e4a-225dba999ce6
Liebrand, Diederik
474825f1-a867-4a2e-96cf-575fb58f4b91
Agnini, Claudia
accab295-8795-4af8-943a-22d2d2afda89
Wilson, Paul A.
f940a9f0-fa5a-4a64-9061-f0794bfbf7c6
Van Peer, Tim E.
da231293-36c0-4d9f-b86c-8b1f059b5134
Xuan, Chuang
3f3cad12-b17b-46ae-957a-b362def5b837
Lippert, Peter C.
65409dec-6fd8-455e-8e4a-225dba999ce6
Liebrand, Diederik
474825f1-a867-4a2e-96cf-575fb58f4b91
Agnini, Claudia
accab295-8795-4af8-943a-22d2d2afda89
Wilson, Paul A.
f940a9f0-fa5a-4a64-9061-f0794bfbf7c6

Van Peer, Tim E., Xuan, Chuang, Lippert, Peter C., Liebrand, Diederik, Agnini, Claudia and Wilson, Paul A. (2017) Extracting a detailed magnetostratigraphy from weakly magnetized, Oligocene to early Miocene sediment drifts recovered at IODP Site U1406 (Newfoundland margin, northwest Atlantic Ocean). Geochemistry, Geophysics, Geosystems. (doi:10.1002/2017GC007185).

Record type: Article

Abstract

Fine-grained magnetic particles in deep-sea sediments often statistically align with the ambient magnetic field during (and shortly after) deposition and can therefore record geomagnetic reversals. Correlation of these reversals to a geomagnetic polarity time scale is an important geochronological tool that facilitates precise stratigraphic correlation and dating of geological records globally. Sediments often carry a remanence strong enough for confident identification of polarity reversals, but in some cases a low signal-to-noise ratio prevents the construction of a reliable and robust magnetostratigraphy. Here we implement a data-filtering protocol, which can be integrated with the UPmag software package, to automatically reduce the maximum angular deviation and statistically mask noisy data and outliers deemed unsuitable for magnetostratigraphic interpretation. This protocol thus extracts a clearer signal from weakly magnetized sediments recovered at Integrated Ocean Drilling Program (IODP) Expedition 342 Site U1406 (Newfoundland margin, northwest Atlantic Ocean). The resulting magnetostratigraphy, in combination with shipboard and shore-based biostratigraphy, provides an age model for the study interval from IODP Site U1406 between Chrons C6Ar and C9n (∼21-27 Ma). We identify rarely observed geomagnetic directional changes within Chrons C6Br, C7r, and C7Ar, and perhaps within Subchron C8n.1n. Our magnetostratigraphy dates three intervals of unusual stratigraphic behavior within the sediment drifts at IODP Site U1406 on the Newfoundland margin. These lithostratigraphic changes are broadly concurrent with the coldest climatic phases of the middle Oligocene to early Miocene and we hypothesize that they reflect changes in bottom-water circulation.

Text
vanPeer_etal_2017_MagstratU1406 - Accepted version
Download (28MB)
Text
vanPeer_etal_2017_MagstratU1406(2) publishers version
Download (3MB)

More information

Accepted/In Press date: 25 September 2017
e-pub ahead of print date: 29 September 2017

Identifiers

Local EPrints ID: 414840
URI: http://eprints.soton.ac.uk/id/eprint/414840
ISSN: 1525-2027
PURE UUID: 843be20b-62dc-480a-9922-b81304ed7334
ORCID for Tim E. Van Peer: ORCID iD orcid.org/0000-0003-3516-4198
ORCID for Chuang Xuan: ORCID iD orcid.org/0000-0003-4043-3073

Catalogue record

Date deposited: 12 Oct 2017 16:31
Last modified: 18 Feb 2021 17:37

Export record

Altmetrics

Contributors

Author: Tim E. Van Peer ORCID iD
Author: Chuang Xuan ORCID iD
Author: Peter C. Lippert
Author: Diederik Liebrand
Author: Claudia Agnini
Author: Paul A. Wilson

University divisions

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.

×