Single Phase Oxidation of Ferrimagnetic Grains as a Cause of L-Shaped Arai–Nagata Diagrams

Щербаков, В. П.; Грибов, С. К.; Aphinogenova, N. A.; Tselmovich, V. A.

doi:10.1134/s1069351320050109

Cited by 5 publications

(3 citation statements)

References 13 publications

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“…Pseudo‐Arai plots (Figure 5b) look similar to thermal and microwave Thellier methods, often showing the same two‐slope behavior, indicating that the L‐shape in the Arai plots of the heating methods is not related to laboratory heating (Shcherbakov et al., 2020). Curvatures of the selected best‐fit line segment were generally low.…”

Section: Resultsmentioning

confidence: 89%

“…As is often the case when measuring weak paleointensities, specimens showed two slope behavior in Thellier experiments (e.g., Bono et al., 2019; Hawkins et al., 2019; Shcherbakova et al., 2020, Thallner et al., 2021), as shown in Figure 4. A single oxidation event as cause for the L‐shaped Arai plots (Shcherbakov et al., 2020) is unlikely as the change in slope generally coincided with a change in direction (Figures 4a and 4b) after overprints were removed around integrals of ∼100 W s or temperatures of ∼400°C. This change in direction was not always clearly visible (e.g., Figure 4d) and in 15 experiments, the slopes in the temperature range between 20 and 320°C or the power integral range between 0 and 99 W s pass selection criteria and result in paleointensities between 22 and 156 μT.…”

Section: Resultsmentioning

confidence: 98%

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New Paleointensities From the Skinner Cove Formation, Newfoundland, Suggest a Changing State of the Geomagnetic Field at the Ediacaran‐Cambrian Transition

et al. 2021

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Information about long-term variations of geomagnetic field behavior, derived from paleomagnetic data, allow insight into the evolution of the deep Earth interior over geological timescales (Sprain et al., 2018). Numerical geodynamo simulations used to tie the geomagnetic field behavior to changes in the Earth's core and mantle rely on high-quality paleomagnetic data and their interpretations. However, scarce and/or ambiguous paleomagnetic data lead to controversial and highly discussed interpretations of the field behavior in time periods like the Ediacaran (e.g., Robert et al., 2017) or the Devonian (Torsvik et al., 2012).A recent rise in interest of the Ediacaran period (635-538 Ma, Xiao & Narbonne, 2020) has led to an improvement in data coverage for this time period but the reliability and ambiguity of data remain troubling. Directional data often result in apparent polar wander paths (APWPs) with rapid oscillations between two widely separated sets of poles (Abrajevitch & Van der Voo, 2010), making paleogeographic reconstructions difficult. In addition, paleointensity studies from Laurentia (Bono et al., 2019;Thallner et al., 2021) and Baltica (Shcherbakova et al., 2020) suggest a weak sustained field, fundamentally different from younger fields (Kulakov et al., 2019), with minimum paleointensity values similar to those in short-term intensity

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Section: Resultsmentioning

confidence: 89%

Section: Resultsmentioning

confidence: 98%

New Paleointensities From the Skinner Cove Formation, Newfoundland, Suggest a Changing State of the Geomagnetic Field at the Ediacaran‐Cambrian Transition

et al. 2021

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“…Required information to reproduce the experiments is provided in Section 2. Required data to reproduce the figures are available at Open Data LMU (Shcherbakov et al., 2024).…”

Section: Data Availability Statementmentioning

confidence: 99%

Potential Bias in Volcanic Paleomagnetic Records Due To Superimposed Chemical Remanent Magnetization

Shcherbakov,

Lhuillier,

Gribov

et al. 2024

Geophysical Research Letters

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Volcanic rocks, preserving paleorecords of Earth's magnetic field, are essential to constrain the working of the geodynamo, provided their primary signal was not biased. Using a thermomagnetometer, we simulate a situation where a sample's primary record, carried by a thermoremanence (TRM, acquired by cooling in air from 600°C to room temperature), is partly overprinted by a chemical remanence (CRM, acquired by 200 hr of isothermal exposure at 400°C). This situation leads to two directional and intensity components (in the form of linear segments) in the Zijderveld and Arai‐Nagata diagrams. In the case of unstable titanomagnetite grains prior to CRM acquisition, we show that both components can be strongly biased by up to ∼50° for paleodirections and ∼50% for paleointensities. In such a worst‐case scenario, the secondary CRM strongly overprints the primary TRM, rendering the common interpretation of Zijderveld and Arai‐Nagata diagrams in terms of characteristic components invalid.

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Properties of Red Sea Pillow-Basalt Titanomagnetite at Different Distances from the Crust

Tselebrovskiy

Максимочкин

Tatarintsev

et al. 2023

Izv., Phys. Solid Earth

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Single Phase Oxidation of Ferrimagnetic Grains as a Cause of L-Shaped Arai–Nagata Diagrams

Cited by 5 publications

References 13 publications

New Paleointensities From the Skinner Cove Formation, Newfoundland, Suggest a Changing State of the Geomagnetic Field at the Ediacaran‐Cambrian Transition

New Paleointensities From the Skinner Cove Formation, Newfoundland, Suggest a Changing State of the Geomagnetic Field at the Ediacaran‐Cambrian Transition

Potential Bias in Volcanic Paleomagnetic Records Due To Superimposed Chemical Remanent Magnetization

Properties of Red Sea Pillow-Basalt Titanomagnetite at Different Distances from the Crust

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