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.
Van Peer, Tim E.
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Xuan, Chuang
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Lippert, Peter C.
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Liebrand, Diederik
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Agnini, Claudia
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Wilson, Paul A.
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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).
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.
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vanPeer_etal_2017_MagstratU1406 - Accepted version
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vanPeer_etal_2017_MagstratU1406(2) publishers version
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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
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Date deposited: 12 Oct 2017 16:31
Last modified: 16 Mar 2024 04:37
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Author:
Tim E. Van Peer
Author:
Peter C. Lippert
Author:
Diederik Liebrand
Author:
Claudia Agnini
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