Late Ediacaran magnetic field hyperactivity: Quantifying the reversal frequency in the Zigan Formation, Southern Urals, Russia

Levashova, Natalia M.; Голованова, И. В.; Rud’ko, D. V.; Данукалов, К. Н.; Рудько, С. В.; Salmanova, R. Yu.; Meert, Joseph G.

doi:10.1016/j.gr.2021.02.018

Cited by 19 publications

(16 citation statements)

References 75 publications

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“…The observations of decreasing VGP dispersion and increasing field strength both support the field stabilizing at the Ediacaran‐Cambrian transition. In contrast, magnetostratigraphic data from the late Ediacaran (Bazhenov et al., 2016) and the Early Cambrian (Levashova et al., 2021) as well as the Middle Cambrian (Gallet et al., 2019) suggest that the hyperactive state of the field in the Ediacaran could extend into the mid‐Cambrian in a single or series of recurring hyperactivity events. While reversal frequencies in the Early Cambrian are still rather poorly constrained, Gallet et al.…”

Section: Discussionmentioning

confidence: 99%

“…The morphology of the Ediacaran field is less clear than its weak nature: Abrajevitch and Van der Voo (2010) and Halls et al (2015) report and compile published evidence of unusual, possibly non-dipolar directional behavior but this appears to be at odds with the high dipolarity inferred from the data of Bazhenov et al (2016) and Levashova et al (2021).…”

Section: Tablementioning

confidence: 99%

“…Paleomagnetic directional data become less controversial at the Ediacaran-Cambrian transition after 550 Ma (e.g., McCausland et al, 2011;Meert, 2014). This could imply a more stable and dipole-dominated field, but high reversal frequencies of ≥20 reversals/Myr have been reported for the Early and Middle Cambrian (Gallet et al, 2019;Levashova et al, 2021). The hyperactive episodes in the Ediacaran and the Cambrian seem similar, so paleointensity data becomes vital for the understanding of the field at this time.…”

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confidence: 99%

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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: Discussionmentioning

confidence: 99%

Section: Tablementioning

confidence: 99%

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confidence: 99%

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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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“…Magnetostratigraphy studies from Ediacaran rocks (e.g., Pavlov and Gallet, 2010;Bazhenov et al, 2016;Meert et al, 2016) or middle Cambrian rocks (Pavlov and Gallet, 2001;Gallet et al, 2019) show large numbers of polarity reversals in sedimentary stratigraphic sections. Although all these studies showed a high reversal frequency based on estimated sediment accumulation rates, only the most recent study of the Ediacaran Zigan Formation from the Urals (Levashova et al, 2021) presented a calibrated sediment accumulation rate using rock magnetic cyclostratigraphy (Kodama and Hinnov, 2014). The Zigan Formation is dated to be 547 Ma in the latest Ediacaran, just before the Cambrian explosion of life at about 540 Ma.…”

Section: Introductionmentioning

confidence: 99%

“…The Rainstorm Member records the Shuram carbon isotope excursion, hence its age is ∼574 Ma. Given the recent cyclostratigraphycalibrated reversal frequency of 20 R/Ma from the Zigan Formation (Levashova et al, 2021)…”

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confidence: 99%

Combined Magnetostratigraphy From Three Localities of the Rainstorm Member of the Johnnie Formation in California and Nevada, United States Calibrated by Cyclostratigraphy: A 13 R/Ma Reversal Frequency for the Ediacaran

Kodama

2021

Front. Earth Sci.

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A combined magnetostratigraphy for the Rainstorm Member of the Ediacaran Johnnie Formation was constructed using the sediment accumulation rates determined by rock magnetic cyclostratigraphy for three localities of the Rainstorm Member to provide a high resolution, time-calibrated record of geomagnetic field reversal frequency at a critical time period in Earth history. Two previously reported magnetostratigraphy records from Death Valley, California, the Nopah Range and Winters Pass Hills (Minguez et al., 2015), were combined with new paleomagnetic and cyclostratigraphic results from the Desert Range locality of the Rainstorm Member in south central Nevada, United States . The Johnnie oolite marker bed is at the base of each of the three sections and allows their regional correlation. The Nopah Range and Desert Range localities have similar sediment accumulation rates of ∼5 cm/ka, so their stratigraphic sections can be combined directly. The Winters Pass Hills locality has a higher sediment accumulation rate of 8.4 cm/ka, therefore its stratigraphic positions are multiplied by 0.6 to combine with the Desert Range and Nopah Range magnetostratigraphy. The thermal demagnetization results from the Desert Range locality isolates characteristic remanent magnetizations that indicate two nearly antipodal east-west and shallow directions and a mean paleopole (11.7˚N, 348.4˚E) that is consistent with “shallow” Ediacaran directions. The Desert Range also yields a magnetic susceptibility rock magnetic cyclostratigraphy that records short eccentricity, obliquity, and precession astronomically-forced climate cycles in the Ediacaran. The high-resolution combined magnetostratigraphy with nearly meter-scale stratigraphic spacing (nominally 23 ka, based on the Desert Range sediment accumulation rate), indicates 11 polarity intervals in a cyclostratigraphy-calibrated duration of 849 ka, indicating a reversal frequency of 13 R/Ma. The Rainstorm Member records the Shuram carbon isotope excursion, hence its age is ∼574 Ma. Given the recent cyclostratigraphy-calibrated reversal frequency of 20 R/Ma from the Zigan Formation (Levashova et al., 2021) at 547 Ma, our results show that reversal frequency was high but fluctuated during the Ediacaran.

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Section of the Asha Series (Southern Urals)—Basu or Zigan Formation?

Golovanova,

Danukalov,

Parfirjev

et al. 2023

Springer Proceedings in Earth and Environmental Sciences

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Late Ediacaran magnetic field hyperactivity: Quantifying the reversal frequency in the Zigan Formation, Southern Urals, Russia

Cited by 19 publications

References 75 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

Combined Magnetostratigraphy From Three Localities of the Rainstorm Member of the Johnnie Formation in California and Nevada, United States Calibrated by Cyclostratigraphy: A 13 R/Ma Reversal Frequency for the Ediacaran

Section of the Asha Series (Southern Urals)—Basu or Zigan Formation?

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