2019
DOI: 10.1093/gji/ggz566
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Abstract: SUMMARY The time-averaged geomagnetic field is generally purported to be uniformitarian across Earth history—close to a geocentric axial dipole, with average strength within one order of magnitude of that at present. Nevertheless, recent studies have reported that the field was approximately ten times weaker than present in the mid-Palaeozoic (∼410–360 Ma) and late Ediacaran (∼565 Ma). Here we present the first whole-rock palaeointensity determinations of Ediacaran age outside of Laurentia. Thes… Show more

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Cited by 37 publications
(35 citation statements)
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References 62 publications
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“…For the one class B result, DRAT and CDRAT had to be relaxed. 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.…”
Section: Resultsmentioning
confidence: 75%
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“…For the one class B result, DRAT and CDRAT had to be relaxed. 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.…”
Section: Resultsmentioning
confidence: 75%
“…Differences in intensity results between microwave and thermal Thellier experiments that have been reported previously (Biggin, 2010; Laj et al., 2011) have been tied to the usage of the original Thellier (Thellier & Thellier, 1959) and perpendicular (Kono & Ueno, 1977) protocols that failed to detect non‐ideal behavior of magnetic carriers in those studies (Grappone et al., 2020). Using double heating protocols for both thermal and microwave experiments, equivalent paleointensities have been reported for Ediacaran aged lava flows with non‐ideal magnetic mineralogy (Shcherbakova et al., 2020). Equivalence of intensity results between DHT‐Shaw and thermal Thellier as well as microwave experiments have been demonstrated in several studies as well (Lloyd et al., 2021; Yamamoto et al., 2007, 2010).…”
Section: Discussionmentioning
confidence: 99%
“…High-reversal rates like those proposed for the late Devonian Period (Shcherbakova et al, 2019;Hawkins et al, 2021) can be difficult to test if sampling density is low. However, detailed sampling of this core, with samples spaced on average 25 cm apart (representing ∼10,000-30,000 years resolution), means that the frequent reversals recorded here (Figure 4) are consistent with a high-reversal-rate field.…”
Section: Resultsmentioning
confidence: 99%
“…Globally there is a dearth of paleomagnetic data in the Devonian Period. The complex and frequently weak Devonian magnetic data could be attributed to a low-intensity, non-dipolar field (Shcherbakova et al, 2017;Hawkins et al, 2021) and/or a hyperreversal period of the magnetic field (Shcherbakova et al, 2019). Regardless of causal reasons for the dearth of poles and ambiguous magnetic records, these consistent challenges with interpreting data in the Devonian Period lower the confidence in other stratigraphic and chronologic records correlated with them.…”
Section: Introductionmentioning
confidence: 99%
“…Gallet et al, 2019), or the Ediacaran (Bazhenov et al, 2016;Kodama, 2020). It is striking that good results can be obtained from the Ediacaran, as the field in the Ediacaran was likely as weak as, or weaker than in the Devonian (Bono et al, 2019;Shcherbakova et al, 2020;Thallner et al, 2020), which begs the question: was the field in the Devonian of a different character to that of the field in the Ediacaran?…”
Section: Overprintingmentioning
confidence: 99%