Variability of the 0–3 Ma palaeomagnetic field observed from the Boring Volcanic Field of the Pacific Northwest

Lhuillier, Florian; Щербаков, В. П.; Gilder, Stuart; Hagstrum, Jonathan T.

doi:10.1093/gji/ggx288

Cited by 13 publications

(10 citation statements)

References 46 publications

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“…Every attempt was made to include only paleodirectional sites that accurately reflect the geomagnetic field; as a result, some studies were excluded from the compilation when demagnetization methods were not clearly stated (i.e., when we could not verify the use of principle component analysis) or if the study authors determined that the in situ integrity of their samples was compromised by tectonic effects and/or deformation. In instances in which a study reexamined or incorporated previously published material we included only the most recent publication to avoid duplicating directional sites (e.g., Antarctica, where Lawrence et al () built on previous work of Tauxe et al (a) and Mankinen and Cox (), and the Boring Volcanic Field where Lhuillier et al () reanalyzed the work of Hagstrum et al ()).…”

Section: The Psv10 Compilationmentioning

confidence: 99%

PSV10: A Global Data Set for 0–10 Ma Time‐Averaged Field and Paleosecular Variation Studies

Cromwell

Johnson

Tauxe

et al. 2018

Geochem Geophys Geosyst

249

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Globally distributed paleomagnetic data from discrete volcanic sites have previously been used for statistical studies of paleosecular variation and the structure of the time‐averaged field. We present a new data compilation, PSV10, selected from high‐quality paleodirections recorded over the past 10 Ma and comprising 2,401 sites from 81 studies. We require the use of modern laboratory and processing methods, a minimum of four samples per site, and within‐site Fisher precision parameter, kw, ≥50. Studies that identify significant tectonic effects or explicitly target transitional field states are excluded, thereby reducing oversampling of transitional time intervals. Additionally, we apply two approaches using geological evidence to minimize effects of short‐term serial correlation. PSV10 is suitable for use in new global geomagnetic and paleomagnetic studies as it has greatly improved spatial coverage of sites, especially at equatorial and high latitudes. VGP dispersion is latitudinally dependent, with substantially higher values in the Southern Hemisphere than at corresponding northern latitudes when no VGP cutoff is imposed. Average inclination anomalies for 10° latitude bins range from about +3 ± 2° to −7.5 ± 2° for the entire data set, with the largest negative values occurring at equatorial and mid‐northern latitudes. New 0–5 Ma TAF models (LN3 and LN3‐SC) based on selections of normal polarity data from PSV10 indicate a g20 term that is 3.0% of g10. Non‐zonal variations in field structure are observed near the magnetic equator and in regions of increased radial flux at high latitudes over the Americas, the Indian Ocean, and Asia.

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Section: The Psv10 Compilationmentioning

confidence: 99%

PSV10: A Global Data Set for 0–10 Ma Time‐Averaged Field and Paleosecular Variation Studies

Cromwell

Johnson

Tauxe

et al. 2018

Geochem Geophys Geosyst

249

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“…Two such estimates were previously obtained on volcanic rocks. The first one ( ε F = 44 ± 5%, N = 47) derived from eruptive units from the Boring Volcanic Field (Oregon, USA) corresponds to the 0–3 Ma interval when polarity reversals occurred in average 5 times per Myr (Lhuillier et al., 2017). The second one ( ε F = 31 ± 4%, N = 28) derived from the Tuoyun volcanics at 112–115 Ma characterizes the behavior of the Earth's magnetic field during the CNS (Lhuillier et al., 2016).…”

Section: Discussionmentioning

confidence: 99%

“…In this study, the analysis was performed using the automated Sushibar system in 5 mT steps up 30 mT, then in 10 mT steps up to 90 mT. To account for the variable amounts of NRM remaining after the 90 mT step, we removed by vector subtraction the residual magnetization from all remanence data (Lhuillier et al., 2017). The results were analyzed in the framework of a pseudo‐Arai diagram that compares the remaining NRM with the acquired ARM.…”

Section: Methodsmentioning

confidence: 99%

“…(2003). The purpose of the pseudo‐Thellier experiments in this study is not to provide calibrated paleointensities (e.g., Bogue, 2018; de Groot et al., 2013) but to investigate the relative variability in intensity as a PSV proxy (e.g., Lhuillier et al., 2016, 2017).…”

Section: Methodsmentioning

confidence: 99%

“…While the use of RPI is common in sedimentary rocks, its usage in volcanic rocks was promoted by Yu et al (2003). The purpose of the pseudo-Thellier experiments in this study is not to provide calibrated paleointensities (e.g., Bogue, 2018;de Groot et al, 2013) but to investigate the relative variability in intensity as a PSV proxy (e.g., Lhuillier et al, 2016Lhuillier et al, , 2017.…”

Section: Pseudo-thellier Experiments 431 Methodsmentioning

confidence: 99%

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Paleomagnetism of Paleocene‐Maastrichtian (60–70 Ma) Lava Flows From Tian Shan (Central Asia): Directional Analysis and Paleointensities

et al. 2020

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The Tuoyun volcanics from the Tian Shan range (Central Asia) give an opportunity to investigate the variability of the Earth's magnetic field during the Cretaceous and Early Paleogene. In the paper we focus on Maastrichtian-Paleocene basalts and report new paleomagnetic results from 70 lava flows (respectively 45 directional groups) sampled near Tuoyun village (75.33°E; 40.18°N) from three distinct sections. Combined with previous results, our new data set yields a virtual geomagnetic pole at φ S ¼ 180.2°E, ϑ S ¼ 49.5°N with an angular standard deviation S ¼ 20:8 ∘ j 23:1 ∘ 18:8 ∘ (for N ¼ 93 directional groups). The mean inclination I s ¼ 36.2°is indicative of an emplacement of the Tuoyun volcanics at a paleolatitude around 20°N, consistent with the high dispersion k ¼ 14.6 of the directions. Such an inclination value is 10-15°l ower than the predictions from the apparent polar wander paths for stable Europe and East Asia. This observation can be partly explained by crustal shortening within the East Asian plate during the India-Asia convergence, but also needs to invoke a local field anomaly in Central Asia as previously proposed. Our absolute paleointensity experiments conducted on two lava flows and two baked sedimentary layers yield a mean virtual dipole moment of 58.9 ± 6.9 ZA•m 2 , consistent with the values at 60-70 Ma in the global paleointensity database. Compared to relative paleointensity results during the Cretaceous Normal Superchron and during the Plio-Pleistocene, the relative variability in intensity-supposed to be a proxy for the geodynamo's activity-estimated here at 31 ± 5% (N ¼ 15) from pseudo-Thellier experiments possibly corroborates a correlation between geomagnetic reversal frequency and paleosecular variation rate during the past 120 Myr. An open question is whether the changes in the frequency of reversals correlate with the gradual temporal changes of the magnetic field during stable periods, referred to as paleosecular variation (PSV). An increase of PSV rate with reversal frequency has often been proposed (e.g., Biggin et al., 2008). Identifying such a correlation however depends on our ability to accurately quantify PSV through geological time. This is

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A global apparent polar wander path for the last 320 Ma calculated from site-level paleomagnetic data

Vaes,

van Hinsbergen,

van de Lagemaat

et al. 2023

Earth-Science Reviews

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Variability of the 0–3 Ma palaeomagnetic field observed from the Boring Volcanic Field of the Pacific Northwest

Cited by 13 publications

References 46 publications

PSV10: A Global Data Set for 0–10 Ma Time‐Averaged Field and Paleosecular Variation Studies

PSV10: A Global Data Set for 0–10 Ma Time‐Averaged Field and Paleosecular Variation Studies

Paleomagnetism of Paleocene‐Maastrichtian (60–70 Ma) Lava Flows From Tian Shan (Central Asia): Directional Analysis and Paleointensities

A global apparent polar wander path for the last 320 Ma calculated from site-level paleomagnetic data

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