Paleomagnetism.org: An online multi-platform open source environment for paleomagnetic data analysis

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

doi:10.1016/j.cageo.2016.05.007

Cited by 220 publications

(230 citation statements)

References 35 publications

(60 reference statements)

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“…Thermal demagnetizations were carried out by using a shielded oven, with the remanence at each step measured with a cryogenic magnetometer. Demagnetization data were plotted on orthogonal diagrams [ Zijderveld , ], and remanence components were isolated via principal component analysis [ Kirschvink , ] using online software for paleomagnetic data analysis [http://www.paleomagnetism.org [ Koymans et al , ]. Calculated characteristic remanent magnetization components (ChRMs) with maximum angle of deviation [ Kirschvink , ] larger than 15° were discarded.…”

Section: Sampling and Methodsmentioning

confidence: 99%

Kinematics of Late Cretaceous subduction initiation in the Neo‐Tethys Ocean reconstructed from ophiolites of Turkey, Cyprus, and Syria

et al. 2017

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Formation of new subduction zones represents one of the cornerstones of plate tectonics, yet both the kinematics and geodynamics governing this process remain enigmatic. A major subduction initiation event occurred in the Late Cretaceous, within the Neo‐Tethys Ocean between Gondwana and Eurasia. Suprasubduction zone ophiolites (i.e., emerged fragments of ancient oceanic lithosphere formed at suprasubduction spreading centers) were generated during this subduction event and are today distributed in the eastern Mediterranean region along three ~E‐W trending ophiolitic belts. Several models have been proposed to explain the formation of these ophiolites and the evolution of the associated intra‐Neo‐Tethyan subduction zone. Here we present new paleospreading directions from six Upper Cretaceous ophiolites of Turkey, Cyprus, and Syria, calculated by using new and published paleomagnetic data from sheeted dyke complexes. Our results show that ~NNE‐SSW subduction zones were formed within the Neo‐Tethys during the Late Cretaceous, which we propose were part of a major step‐shaped subduction system composed of ~NNE‐SSW and ~WNW‐ESE segments. We infer that this subduction system developed within old (Triassic?) lithosphere, along fracture zones and perpendicular weakness zones, since the Neo‐Tethyan spreading ridge formed during Gondwana fragmentation would have already been subducted at the Pontides subduction zone by the Late Cretaceous. Our new results provide an alternative kinematic model of Cretaceous Neo‐Tethyan subduction initiation and call for future research on the mechanisms of subduction inception within old (and cold) lithosphere and the formation of metamorphic soles below suprasubduction zone ophiolites in the absence of nearby spreading ridges.

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Section: Sampling and Methodsmentioning

confidence: 99%

Kinematics of Late Cretaceous subduction initiation in the Neo‐Tethys Ocean reconstructed from ophiolites of Turkey, Cyprus, and Syria

et al. 2017

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“…Therefore, the inclinations found (12.7˚ ± 11.7˚) are too shallow when compared to the geological constraints, indicating a magnetization acquired when the rocks were at nearly equatorial paleolatitudes (λ = 6.4˚ S ± ~6˚). Following the global apparent polar wander path (GAPWaP) of Torsvik et al (2012) calculated for Iberia (given in Koymans et al, 2016) …”

Section: Component #2mentioning

confidence: 99%

“…3; Supplementary File SF3). Principal component analysis (PCA; Kirschvink, 1980) was used to isolate the direction of the characteristic remanent magnetization and results were represented by orthogonal vector endpoint demagnetization diagrams (Zijderveld, 1967) using Paleomagnetism.org (Koymans et al, 2016). Representative Zijderveld diagrams are shown in Fig.…”

Section: Paleomagnetismmentioning

confidence: 99%

“…Mean directions (Table 1) were evaluated using Fisher statistics (1953) of virtual geomagnetic poles (VGPs) corresponding to the isolated magnetic directions, following Deenen et al (2011). All statistics were performed with www.paleomagnetism.org (Koymans et al, 2016) and VPD software (Ramón et al, 2017). Most samples show a component which is removed at low temperatures and low coercivities (100-180 °C or 10-12 mT; Fig.…”

Section: Paleomagnetismmentioning

confidence: 99%

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Late Paleozoic Iberian orocline(s) and the missing shortening in the core of Pangea. Paleomagnetism from the Iberian Range.

Pastor‐Galán¹,

Pueyo²,

Diederen³

et al. 2018

Preprint

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Supercontinents are usually interpreted to be single and rigid continental plates. How and when Pangea became a rigid supercontinent is disputed, and age estimations vary from ~330 to ~240 Ma.The Gondwana-Laurussia collision formed the Variscan-Alleghanian belt, the most prominent witness of Pangea's amalgamation. In Iberia, this orogen draws an "S" shape featured by the Once the Cenozoic rotation is restored, the change in structural trend that allegedly evidences the outer arc of the Central Iberian curve disappears. Whereas the Cenozoic rotation is incompatible with a Central Iberian curve, the Late Carboniferous rotation is fully compatible with the Cantabrian Orocline, enlarging the area affected by its counterclockwise rotations and the existence of a non-rigid Pangea until, at least, ~295 M.a.

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“…We used the following temperature scheme (in°C): 20-150, 100-250, 150-350, 250-400, 350-500 and 400-700. Statistical analysis and interpretation were performed using the online, platform independent portal: www. paleomagnetism.org (Koymans et al 2016). Demagnetisation diagrams are plotted as orthogonal vector diagrams (Zijderveld 1967).…”

Section: Methodsmentioning

confidence: 99%

Post-remagnetisation vertical axis rotation and tilting of the Murihiku Terrane (North Island, New Zealand)

Lagemaat

Boschman

Kamp

et al. 2017

New Zealand Journal of Geology and Geophysics

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We collected palaeomagnetic sample sets from Murihiku Terrane, North Island to constrain its palaeolatitude during the Late Triassic-Jurassic. The majority of the sample host rocks were remagnetised. However, a few samples show a magnetic signal that possibly recorded a primary remanent magnetisation. These samples preliminarily indicate that Murihiku Terrane was located at c. 63°S during the Early Jurassic. The remagnetised samples reveal significant post-remagnetisation tectonic rotation and tilting of the host rocks. We estimated an 83 ± 5 Ma timing of remagnetisation by plotting the palaeolatitude data on the apparent polar wander path of northern Zealandia. Samples from southernmost sites have lower inclination, which we interpret as reflecting eastward post-remagnetisation tilt of this region by 20°. In addition, declination data indicate large-scale post-remagnetisation rotation of Port Waikato and Awakino Gorge areas. This study contributes to the ongoing debate on the age and tectonic origin of oroclines in New Zealand basement. ARTICLE HISTORY

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Paleomagnetism.org: An online multi-platform open source environment for paleomagnetic data analysis

Cited by 220 publications

References 35 publications

Kinematics of Late Cretaceous subduction initiation in the Neo‐Tethys Ocean reconstructed from ophiolites of Turkey, Cyprus, and Syria

Kinematics of Late Cretaceous subduction initiation in the Neo‐Tethys Ocean reconstructed from ophiolites of Turkey, Cyprus, and Syria

Late Paleozoic Iberian orocline(s) and the missing shortening in the core of Pangea. Paleomagnetism from the Iberian Range.

Post-remagnetisation vertical axis rotation and tilting of the Murihiku Terrane (North Island, New Zealand)

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