Quantifying Inclination Shallowing and Representing Flattening Uncertainty in Sedimentary Paleomagnetic Poles

Pierce, James L.; Zhang, Yiming; Hodgin, Eben Blake; Swanson‐Hysell, Nicholas L.

doi:10.1029/2022gc010682

Cited by 7 publications

(20 citation statements)

References 85 publications

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“…The mean pole position of the Kent distribution was calculated following the method of Pierce et al. (2022). The close proximity between Jacobsville poles with the Chequamegon pole is consistent with their deposition being coeval.…”

Section: Discussionmentioning

confidence: 99%

“…This uncertainty results in more uncertainty associated with paleolatitude which for the pole is along the great circle path between the mean pole position and the locality of the Jacobsville sections. Following Pierce et al (2022), the pole can be represented with a Kent distribution 95% confidence ellipse which is: mean longitude = 183.4°E, mean latitude = 16.9°S, major axis longitude = 255.5°E, major axis latitude = 45.2°N, major axis confidence angle = 4.1°, minor axis longitude = 108.1°E, minor axis latitude = 39.9°N, minor axis confidence angle = 3.1°(Figure 7; Table 1). This pole position is close to the end of the Keweenawan Track (Figure 8) and far away from Laurentia's pole positions during the Paleozoic when there was orogenesis along Laurentia's eastern margin (Figure S7 in Supporting Information S1).…”

Section: Averaging Paleosecular Variation and Correcting For Inclinat...mentioning

confidence: 99%

“…1.1 Ga lava flows of the Midcontinent Rift (Tauxe & Kodama, 2009). Furthermore, Pierce et al (2022) showed that applying the E/I method to detrital hematite magnetizations within the ca. 1,093 Ma Cut Face Creek Sandstone in the Midcontinent Rift successfully corrects the shallow paleomagnetic inclinations of the sediments to that of the North Shore Volcanic Group lava flows that bracket them.…”

Section: Averaging Paleosecular Variation and Correcting For Inclinat...mentioning

confidence: 99%

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Tracking Rodinia Into the Neoproterozoic: New Paleomagnetic Constraints From the Jacobsville Formation

Zhang,

Hodgin,

Alemu

et al. 2024

Tectonics

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The paleogeography of Laurentia throughout the Neoproterozoic is critical for reconstructing global paleogeography due to its central position in the supercontinent Rodinia. We develop a new paleomagnetic pole from red siltstones and fine‐grained sandstones of the early Neoproterozoic Jacobsville Formation which is now constrained to be ca. 990 Ma in age. High‐resolution thermal demagnetization experiments resolve detrital remanent magnetizations held by hematite. These directions were reoriented within siltstone intraclasts and pass intraformational conglomerate tests—giving confidence that the magnetization is detrital and primary. An inclination‐corrected mean paleomagnetic pole position for the Jacobsville Formation indicates that Laurentia's motion slowed down significantly following the onset of the Grenvillian orogeny. Prior rapid plate motion associated with closure of the Unimos Ocean between 1,110 and 1,090 Ma transitioned to slow drift of Laurentia across the equator in the late Mesoproterozoic to early Neoproterozoic. We interpret the distinct position of this well‐dated pole from those in the Grenville orogen that have been assigned a similar age to indicate that the ages of the poles associated with the Grenville Loop likely need to be revised to be younger due to prolonged exhumation.

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Section: Discussionmentioning

confidence: 99%

Section: Averaging Paleosecular Variation and Correcting For Inclinat...mentioning

confidence: 99%

Section: Averaging Paleosecular Variation and Correcting For Inclinat...mentioning

confidence: 99%

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Tracking Rodinia Into the Neoproterozoic: New Paleomagnetic Constraints From the Jacobsville Formation

Zhang,

Hodgin,

Alemu

et al. 2024

Tectonics

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“…Following theoretical expectations of a time‐averaged field, we use Fisher statistics to estimate a measure of centrality, and through repeated calculations we build empirical distribution functions whose shapes can be monitored. This flexibility also provides a more robust way to incorporate uncertainties that otherwise require the adoption of alternative parametric models (e.g., Pierce et al., 2022).…”

Section: Discussionmentioning

confidence: 99%

Embracing Uncertainty to Resolve Polar Wander: A Case Study of Cenozoic North America

Gallo

Domeier

Sapienza

et al. 2023

Geophysical Research Letters

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Tectonic plate motions are integral in shaping many aspects of Earth, including its thermal, geochemical, tectonic, biologic, climatic, and magnetic evolution. Understanding the history of plate motions is therefore directly relevant to a wide variety of research areas. Robust global plate reconstructions have been constructed back to the Jurassic on the basis of marine magnetic anomalies and hotspot tracks (e.g., Seton et al., 2012), but plate model development for earlier times is challenging due to the lack of preserved oceanic lithosphere. Paleomagnetic data offer a key constraint for plate motions, providing the only quantitative tool for plate modeling in pre-Jurassic times.Earth's magnetic field is dominated by a time-averaged dipole aligned with the planetary spin-axis (e.g., Creer et al., 1954), and when a tectonic plate moves with respect to that axis, the directions of the Earth's magnetic field observed locally on that plate change through time. When recorded in rocks, these temporal changes in magnetic direction provide a quantitative archive of a plate's kinematic history. For convenience, a plate can be treated as fixed, and the changing magnetic directions used to determine the apparent motion of the magnetic pole with respect to the plate can be expressed as an apparent polar wander path (APWP, Creer et al., 1954). Construction of an APWP requires a record of paleomagnetic data of various ages from the same rigid plate, which together can

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“…For the global APWP of Vaes et al (2023), we only used sediment-derived paleopoles that were corrected for inclination shallowing using the elongation-inclination (E/I) correction of Tauxe and Kent (2004) and that satisfied the criteria proposed by Vaes et al (2021). This avoided the variable bias posed by potential inclination shallowing and allows propagating the uncertainty associated with the E/I correction in the calculation of the APWP (following the approach of Pierce et al (2022); see section 3 in Vaes et al (2023) for more details). The input file thus includes an optional column for the uncertainty of the E/I correction.…”

Section: Input and Outputmentioning

confidence: 99%

APWP-online.org: a global reference database and open-source tools for calculating apparent polar wander paths and relative paleomagnetic displacements

Vaes¹,

Hinsbergen²,

Paridaens³

2023

Preprint

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Paleomagnetism provides a quantitative tool for estimating paleogeographic displacements of rock units relative to the Earth’s spin axis and is widely used to determine relative tectonic displacements (vertical-axis rotations and paleolatitudinal motions). These relative displacements are commonly determined by comparing a study-mean paleomagnetic pole with a reference pole provided by an apparent polar wander path (APWP), even though these poles are calculated by averaging paleomagnetic data from different hierarchical levels. This conventional approach was recently shown to strongly overestimate the resolution at which paleomagnetic displacements can be determined. This problem was recently overcome by comparing paleomagnetic poles computed at the same hierarchical level, whereby the uncertainty of the reference pole is weighed against the number of datapoints underlying the study-mean pole. To enable the application of this approach, a new global APWP was calculated for the last 320 Ma from (simulated) site-level paleomagnetic data. Applying this method requires a computationally more intensive procedure, however. Here, we therefore present the online, open-source environment APWP-online.org that provides user-friendly tools to determine relative paleomagnetic displacements and to compute APWPs from site-level paleomagnetic data. In addition, the website hosts the curated paleomagnetic database used to compute the most recent global APWP and includes an interface for adding new high-quality paleomagnetic data that may be used for future iterations of the global APWP. We illustrate how the tools can be used through two case studies: the vertical-axis rotation history of the Japanese Islands and the paleolatitudinal motion of the intra-oceanic Olyutorsky arc exposed on Kamchatka.

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Quantifying Inclination Shallowing and Representing Flattening Uncertainty in Sedimentary Paleomagnetic Poles

Cited by 7 publications

References 85 publications

Tracking Rodinia Into the Neoproterozoic: New Paleomagnetic Constraints From the Jacobsville Formation

Tracking Rodinia Into the Neoproterozoic: New Paleomagnetic Constraints From the Jacobsville Formation

Embracing Uncertainty to Resolve Polar Wander: A Case Study of Cenozoic North America

APWP-online.org: a global reference database and open-source tools for calculating apparent polar wander paths and relative paleomagnetic displacements

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