Towards FAIR Paleomagnetic Data Management Through Paleomagnetism.org 2.0

Koymans, Mathijs; Hinsbergen, Douwe J.J. van; Pastor‐Galán, Daniel; Vaes, Bram; Langereis, C.G.

doi:10.1029/2019gc008838

Cited by 60 publications

(62 citation statements)

References 25 publications

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“…The directions of these two sites are, however, not the same and this deviation needs to be explained. The two sites sampled on the 1718 AD historical lava flows, PI04 on the southern flank of Pico volcano and PI07 on the northern flank, have a common true mean direction (Koymans et al, 2020;Tauxe, 2010).…”

Section: Paleomagnetic Directionsmentioning

confidence: 99%

Full‐Vector Paleosecular Variation Curve for the Azores: Enabling Reliable Paleomagnetic Dating for the Past 2 kyr

2021

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• New paleomagnetic data from Pico Island, in the mid-North Atlantic region • Data reveals an inclination low with minimum values of 32° from 900-1560 AD • We present the first full-vector paleosecular variation curve for the Azores covering the past 2 kyr, suitable for paleomagnetic dating Accepted Article This article has been accepted for publication and undergone full peer review but has not been through the copyediting, typesetting, pagination and proofreading process, which may lead to differences between this version and the Version of Record. Please cite this article as

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Section: Paleomagnetic Directionsmentioning

confidence: 99%

Full‐Vector Paleosecular Variation Curve for the Azores: Enabling Reliable Paleomagnetic Dating for the Past 2 kyr

2021

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“…We use a newly compiled paleomagnetic database (provided in the Supplementary Information) for the Antarctic Peninsula and southern South America to test, and if necessary, iteratively improve, our kinematic reconstruction. To this end, we use the online paleomagnetic analysis platform Paleomagnetism.org (Koymans et al, 2020;Koymans et al, 2016). This platform includes a tool that allows to predict the Global Apparent Polar Wander Path (for which we use the version of Torsvik et al (2012) in the coordinates of any restored block in GPlates (see Koymans et al, 2020;Li et al, 2017).…”

Section: Paleomagnetic Data Selectionmentioning

confidence: 99%

“…To this end, we use the online paleomagnetic analysis platform Paleomagnetism.org (Koymans et al, 2020;Koymans et al, 2016). This platform includes a tool that allows to predict the Global Apparent Polar Wander Path (for which we use the version of Torsvik et al (2012) in the coordinates of any restored block in GPlates (see Koymans et al, 2020;Li et al, 2017). We compiled paleomagnetic data derived from Lower Jurassic to Eocene volcanic and sedimentary rocks of the Antarctic Peninsula, and southernmost South America.…”

Section: Paleomagnetic Data Selectionmentioning

confidence: 99%

“…1) The data files of the GPlates reconstruction of the Scotia Sea region: a rotation (.rot) file, a GPlates shapefile (.gpml) containing polygons, and a GPlates shapefile (.gpml) of the isochrons based on marine magnetic anomaly lineations; 2) The paleomagnetic data compilation: an excel file of the paleomagnetic data and two .pub files of the data that can be loaded into Paleomagnetism.org (Koymans et al, 2020); Supplementary data to this article can be found online at [https://doi.org/ 10.1016/j.earscirev.2021.103551].…”

Section: Appendix B Supplementary Datamentioning

confidence: 99%

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Subduction initiation in the Scotia Sea region and opening of the Drake Passage: when and why?

Lagemaat

Vaes

Kosters

et al. 2021

Preprint

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<p>During evolution of the South Sandwich subduction zone, which has consumed South American plate oceanic lithosphere, somehow continental crust of both the South American and Antarctic plates have become incorporated into its upper plate. Continental fragments of both plates are currently separated by small oceanic basins in the upper plate above the South Sandwich subduction zone, in the Scotia Sea region, but how fragments of both continents became incorporated in the same upper plate remains enigmatic. Here we present an updated kinematic reconstruction of the Scotia Sea region using the latest published marine magnetic anomaly constraints, and place this in a South America-Africa-Antarctica plate circuit in which we take intracontinental deformation into account. We show that a change in fracture zone orientation in the Weddell Sea requires that previously inferred initiation of subduction of South American oceanic crust of the northern Weddell below the eastern margin of South Orkney Islands continental crust, then still attached to the Antarctic Peninsula, already occurred around 80 Ma. We propose that subsequently, between ~71-50 Ma, the trench propagated northwards into South America by delamination of South American lithosphere: this resulted in the transfer of delaminated South American continental crust to the overriding plate of the South Sandwich subduction zone. We show continental delamination may have been facilitated by absolute southward motion of South America that was resisted by South Sandwich slab dragging. Pre-drift extension preceding the oceanic Scotia Sea basins led around 50 Ma to opening of the Drake Passage, preconditioning the southern ocean for the Antarctic Circumpolar Current. This 50 Ma extension was concurrent with a strong change in absolute plate motion of the South American Plate that changed from S to WNW, leading to upper plate retreat relative to the more or less mantle stationary South Sandwich Trench that did not partake in the absolute plate motion change. While subduction continued, this mantle-stationary trench setting lasted until ~30 Ma, after which rollback started to contribute to back-arc extension. We find that roll-back and upper plate retreat have contributed more or less equally to the total amount of ~2000 km of extension accommodated in the Scotia Sea basins. We highlight that viewing tectonic motions in a context of absolute plate motion is key for identifying slab motion (e.g. rollback, trench-parallel slab dragging) and consequently mantle-forcing of geological processes.</p>

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“…5, 5, 7.5, 10, 15, 20, 25, 30, 40, 50, 60, 70, 80, and 100 mT. The demagnetization data were analyzed using paleomagnetism.org (Koymans et al, 2020;2016), and the characteristic remanent magnetization (ChRM) was obtained for each sample (Fig. 5.3).…”

Section: Paleomagnetic Directionsmentioning

confidence: 99%

Highs, Lows, and Puzzling Intensity Variations of the Earth’s Magnetic Field

Béguin¹

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The Earth's magnetic field has a pivotal role in the Earth Sciences, its applications range from plate tectonics, to magnetostratigraphy. Together with seismology, it is the only window into the deep Earth and the Earth's core. In everyday life, the Earth's magnetic field is important for navigation devices. More importantly, the Earth's magnetic field protects the Earth against harmful solar radiation, and it protects satellites orbiting the Earth. Without the Earth's magnetic field, the atmosphere would have been stripped away and life on Earth would not have been possible. The growth of a stable magnetic field is thought to have been instrumental for the beginning of early life. Understanding the evolution and behavior of the Earth's magnetic field is therefore of great importance. In this thesis I will focus on the study of the strength of the Earth's magnetic field, its intensity. Therefore, I set out to unravel fast and local fluctuations in the direction and strength of the geomagnetic field. Paleointensity-the key to understanding the Earth's magnetic field Methods to derive paleointensity estimates from absolute recorders, e.g. lavas or archaeomagnetic materials, rely on comparing the ancient magnetization of the recorders that was obtained during cooling in the Earth's magnetic field, with a laboratory induced magnetization. As simple as this might sound, obtaining reliable and high quality paleointensity estimates from lavas is notoriously difficult. Besides the laborious effort to obtain paleointensity measurements, there is little consensus on the best approach of interpreting the measurement data and how to distinguish between high and low quality results. The first to propose to obtain information on the past state of the strength of the Earth's magnetic field by studying thermal remanences was Guiseppe Folgheraiter. He proposed that by reheating ancient pottery, the intensity of the ancient magnetization could be compared to the present magnetization (Folgheraiter, 1899). Folgheraiter did find that this method might lead to 'too uncertain results' when the baked vases were reheated several times. Almost forty years later an experimental protocol for estimating the ratio of natural remanent magnetization (NRM) and a laboratory acquired thermal remanence magnetization (TRM) was described by Johann Koenigsberger (1936). Koenigsberger used prologue a comparison of quasi-perpendicular and doubleheating thellier-style paleointensity techniques-towards an optimal protocol 1

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Towards FAIR Paleomagnetic Data Management Through Paleomagnetism.org 2.0

Cited by 60 publications

References 25 publications

Full‐Vector Paleosecular Variation Curve for the Azores: Enabling Reliable Paleomagnetic Dating for the Past 2 kyr

Full‐Vector Paleosecular Variation Curve for the Azores: Enabling Reliable Paleomagnetic Dating for the Past 2 kyr

Subduction initiation in the Scotia Sea region and opening of the Drake Passage: when and why?

Highs, Lows, and Puzzling Intensity Variations of the Earth’s Magnetic Field

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