Post-depositional remanent magnetization lock-in depth in precisely dated varved sediments assessed by archaeomagnetic field models

Mellström, Anette; Nilsson, Andréas; Stanton, Tania; Muscheler, Raimund; Snowball, Ian; Suttie, Neil

doi:10.1016/j.epsl.2014.11.016

Cited by 27 publications

(47 citation statements)

References 72 publications

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“…Estimations of lock‐in depth have been reported earlier in the literature [e.g., Horiuchi et al ., ; Liu et al ., ; Roberts et al ., ; Suganuma et al ., ]. They are frequently estimated as 10–20 cm [ Mellström et al ., ]. Both examples from our study are rather shallower than those of previously studies.…”

Section: Discussioncontrasting

confidence: 61%

“…For example, Mellström et al . [] reported the deep lock‐in depth of a varved lake sediment and suggested that high organic contents, which make a more gradual sediment consolidation induce deep lock‐in depth below the sediment‐water interface. Roberts and Winklhofer [] argued that other factors might control the lock‐in depth for each sedimentary environment.…”

Section: Discussionmentioning

confidence: 99%

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High‐resolution chronology of sediment below CCD based on Holocene paleomagnetic secular variations in the Tohoku‐oki earthquake rupture zone

Kanamatsu

Usami

McHugh

et al. 2017

Geochem Geophys Geosyst

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Using high‐resolution paleomagnetic data, we examined the potential for obtaining precise ages from sediment core samples recovered from deep‐sea basins close to rupture zones of the 2011 and earlier earthquakes off Tohoku, Japan. Obtaining detailed stratigraphic ages from deep‐sea sediments below the calcium compensation depth (CCD) is difficult, but we found that the samples contain excellent paleomagnetic secular variation records to constrain age models. Variations in paleomagnetic directions obtained from the sediments reveal systematic changes in the cores. A stacked paleomagnetic profile closely matches the Lake Biwa data sets in southwest Japan for the past 7000 years, one can establish age models based on secular variations of the geomagnetic field on sediments recovered uniquely below the CCD. Comparison of paleomagnetic directions near a tephra and a paleomagnetic direction of contemporaneous pyroclastic flow deposits acquired by different magnetization processes shows precise depositional ages reflecting the magnetization delay of the marine sediment record.

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Section: Discussioncontrasting

confidence: 61%

Section: Discussionmentioning

confidence: 99%

High‐resolution chronology of sediment below CCD based on Holocene paleomagnetic secular variations in the Tohoku‐oki earthquake rupture zone

Kanamatsu

Usami

McHugh

et al. 2017

Geochem Geophys Geosyst

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“…This has aided in understanding the timing of climate events recorded in sediments (e.g., Antoniades et al (2011);Barletta et al (2010); Ledu et al (2010)) and the dating of archeological and volcanic materials (see Holme (2009), Pavón-Carrasco et al (2009), and Villasante-Marcos and Pavón-Carrasco (2014)). Models based on archeological data have been used to study the lock-in process in precisely dated sediment sequences (Mellström et al 2015).…”

Section: Applications Of Archeomagnetic and Volcanic Data From Geomagmentioning

confidence: 99%

GEOMAGIA50.v3: 1. general structure and modifications to the archeological and volcanic database

et al. 2015

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Background: GEOMAGIA50.v3 is a comprehensive online database providing access to published paleomagnetic, rock magnetic, and chronological data from a variety of materials that record Earth's magnetic field over the past 50 ka.Findings: Since its original release in 2006, the structure and function of the database have been updated and a significant number of data have been added. Notable modifications are the following: (1) the inclusion of additional intensity, directional and metadata from archeological and volcanic materials and an improved documentation of radiocarbon dates; (2) a new data model to accommodate paleomagnetic, rock magnetic, and chronological data from lake and marine sediments; (3) a refinement of the geographic constraints in the archeomagnetic/volcanic query allowing selection of particular locations; (4) more flexible methodological and statistical constraints in the archeomagnetic/volcanic query; (5) the calculation of predictions of the Holocene geomagnetic field from a series of time varying global field models; (6) searchable reference lists; and (7) an updated web interface. This paper describes general modifications to the database and specific aspects of the archeomagnetic and volcanic database. The reader is referred to a companion publication for a description of the sediment database. Conclusions:The archeomagnetic and volcanic part of GEOMAGIA50.v3 currently contains 14,645 data (declination, inclination, and paleointensity) from 461 studies published between 1959 and 2014. We review the paleomagnetic methods used to obtain these data and discuss applications of the data within the database. The database continues to expand as legacy data are added and new studies published. The web-based interface can be found at http:// geomagia.gfz-potsdam.de.

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“…Besides the sedimentation rate, the lock-in depth depends on the thickness of the mixed zone (e.g., by bioturbation) [Roberts et al, 2013]. Also in laminated sediments without bioturbation, a lock-in delay can be observed [Mellstr€ om et al, 2015]. Additionally, uncertainties in the chronologies of the individual records have a major impact.…”

Section: 1002/2015gc006023mentioning

confidence: 99%

“…For example, the analytical error for the radiocarbon ages from TAN12-2 is between 30 and 70 years, while during the calibration process, an age error between 100 and 540 years is calculated. Both mentioned causes for age-offsets (changing lock-in delay and uncertainties in the chronologies) in inclination and declination features commonly affect all sedimentary PSV archives [Mellstr€ om et al, 2015;Nilsson et al, 2014b].…”

Section: 1002/2015gc006023mentioning

confidence: 99%

High‐resolution paleomagnetic and sedimentological investigations on the Tibetan Plateau for the past 16 ka cal B.P.—The Tangra Yumco record

Henkel

Haberzettl

St‐Onge

et al. 2016

Geochem Geophys Geosyst

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The spatial distribution of paleomagnetic secular variation (PSV) records on the Tibetan Plateau and adjacent areas covering the Holocene and Late Glacial is sparse. In order to reconstruct PSV in this area, a piston core covering the past 17.5 ka cal B.P. retrieved from Lake Tangra Yumco, southern‐central Tibetan Plateau, was analyzed. In the laminated sediments, several event layers are intercalated. Those were identified by sedimentological analysis and excluded for age‐depth modeling and interpretation. Paleomagnetic measurements on u‐channels reveal two contrasting core sections. The lower section (dated to 17.5–15.9 ka cal B.P.) is very coarse grained (up to 220 µm) and characterized by low intensities (0.8 mA m−1) and high maximum angular deviation values (mean 25°), making it unsuitable for PSV reconstruction. In contrast, the upper unit (dated to <15.9 ka cal B.P.) yields ideal properties with a well‐defined magnetization carried by low‐coercivity minerals in the pseudo single domain state making those younger sediments a proper record for PSV studies. The robustness of the PSV reconstruction for the past 3000 years is highlighted by a comparable inclination and declination pattern of three short sediment cores (2 m) from Tangra Yumco. On a regional scale, the obtained inclination signal for the past 15.9 ka cal B.P. is in good agreement with the Lake Baikal record (3000 km to the North), PSV stack for East Asia, as well as with predictions of geomagnetic field models. This study is a step forward in constructing a PSV reference curve for central Asia.

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Post-depositional remanent magnetization lock-in depth in precisely dated varved sediments assessed by archaeomagnetic field models

Cited by 27 publications

References 72 publications

High‐resolution chronology of sediment below CCD based on Holocene paleomagnetic secular variations in the Tohoku‐oki earthquake rupture zone

High‐resolution chronology of sediment below CCD based on Holocene paleomagnetic secular variations in the Tohoku‐oki earthquake rupture zone

GEOMAGIA50.v3: 1. general structure and modifications to the archeological and volcanic database

High‐resolution paleomagnetic and sedimentological investigations on the Tibetan Plateau for the past 16 ka cal B.P.—The Tangra Yumco record

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