Paleomagnetism of the Central Iberian curve's putative hinge: Too many oroclines in the Iberian Variscides

Daniel Pastor-Galán; Mark J. Dekkers; Gabriel Gutiérrez-alonso; Daniël Brouwer; Thomas Groenewegen; Wout Krijgsman; Javier Fernández-lozano; Mariano Yenes; Fernando Álvarez-lobato

doi:10.1016/j.gr.2016.06.016

Paleomagnetism of the Central Iberian curve's putative hinge: Too many oroclines in the Iberian Variscides

Daniel Pastor-Galán^*, Mark J. Dekkers, Gabriel Gutiérrez-alonso, Daniël Brouwer, Thomas Groenewegen, Wout Krijgsman, Javier Fernández-lozano, Mariano Yenes, Fernando Álvarez-lobato

^*Corresponding author for this work

Research output: Contribution to journal › Article › Academic › peer-review

Abstract

The Variscan mountain belt in Iberia defines a large “S” shape with the Cantabrian Orocline in the north and the
Central Iberian curve, an alleged orocline belt of opposite curvature, to the south. The Cantabrian Orocline is kinematically
well constrained, but the geometry and kinematics of the Central Iberian curve are still controversial.
Here, we investigate the kinematics of the Central Iberian curve, which plays an important role in the amalgamation
of Pangea since it may have accommodated much of the post-collisional deformation.We have performed a
paleomagnetic study on Carboniferous granitoids and Cambrian limestones within the hinge of the curve. Our
paleomagnetic and rock magnetic results show a primary magnetization in the granitoids and a widespread
Carboniferous remagnetization of the limestones. Syn-kinematic granitoids show ca. 70° counter-clockwise rotations
consistent with the southern limb of the Cantabrian Orocline. Post-kinematic granitoids and Cambrian limestones
show consistent inclinations but very scattered declinations suggesting that they were magnetized
coevally to and after the ~70° rotation. Our results show no differential rotations between northern, southern
limb and the hinge zone. Therefore, we discard a late Carboniferous oroclinal origin for the Central Iberian curve.

Original language	English
Pages (from-to)	96-113
Number of pages	18
Journal	Gondwana Research
Volume	39
DOIs	https://doi.org/10.1016/j.gr.2016.06.016
Publication status	Published - 1 Nov 2016

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Paleomagnetism of the Central Iberian curve's putative hingeFinal published version, 4.48 MBLicence: Taverne

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title = "Paleomagnetism of the Central Iberian curve's putative hinge: Too many oroclines in the Iberian Variscides",

abstract = "The Variscan mountain belt in Iberia defines a large “S” shape with the Cantabrian Orocline in the north and theCentral Iberian curve, an alleged orocline belt of opposite curvature, to the south. The Cantabrian Orocline is kinematicallywell constrained, but the geometry and kinematics of the Central Iberian curve are still controversial.Here, we investigate the kinematics of the Central Iberian curve, which plays an important role in the amalgamationof Pangea since it may have accommodated much of the post-collisional deformation.We have performed apaleomagnetic study on Carboniferous granitoids and Cambrian limestones within the hinge of the curve. Ourpaleomagnetic and rock magnetic results show a primary magnetization in the granitoids and a widespreadCarboniferous remagnetization of the limestones. Syn-kinematic granitoids show ca. 70° counter-clockwise rotationsconsistent with the southern limb of the Cantabrian Orocline. Post-kinematic granitoids and Cambrian limestonesshow consistent inclinations but very scattered declinations suggesting that they were magnetizedcoevally to and after the ~70° rotation. Our results show no differential rotations between northern, southernlimb and the hinge zone. Therefore, we discard a late Carboniferous oroclinal origin for the Central Iberian curve.",

author = "Daniel Pastor-Gal{\'a}n and Dekkers, {Mark J.} and Gabriel Guti{\'e}rrez-alonso and Dani{\"e}l Brouwer and Thomas Groenewegen and Wout Krijgsman and Javier Fern{\'a}ndez-lozano and Mariano Yenes and Fernando {\'A}lvarez-lobato",

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doi = "10.1016/j.gr.2016.06.016",

language = "English",

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T1 - Paleomagnetism of the Central Iberian curve's putative hinge

T2 - Too many oroclines in the Iberian Variscides

AU - Pastor-Galán, Daniel

AU - Dekkers, Mark J.

AU - Gutiérrez-alonso, Gabriel

AU - Brouwer, Daniël

AU - Groenewegen, Thomas

AU - Krijgsman, Wout

AU - Fernández-lozano, Javier

AU - Yenes, Mariano

AU - Álvarez-lobato, Fernando

PY - 2016/11/1

Y1 - 2016/11/1

N2 - The Variscan mountain belt in Iberia defines a large “S” shape with the Cantabrian Orocline in the north and theCentral Iberian curve, an alleged orocline belt of opposite curvature, to the south. The Cantabrian Orocline is kinematicallywell constrained, but the geometry and kinematics of the Central Iberian curve are still controversial.Here, we investigate the kinematics of the Central Iberian curve, which plays an important role in the amalgamationof Pangea since it may have accommodated much of the post-collisional deformation.We have performed apaleomagnetic study on Carboniferous granitoids and Cambrian limestones within the hinge of the curve. Ourpaleomagnetic and rock magnetic results show a primary magnetization in the granitoids and a widespreadCarboniferous remagnetization of the limestones. Syn-kinematic granitoids show ca. 70° counter-clockwise rotationsconsistent with the southern limb of the Cantabrian Orocline. Post-kinematic granitoids and Cambrian limestonesshow consistent inclinations but very scattered declinations suggesting that they were magnetizedcoevally to and after the ~70° rotation. Our results show no differential rotations between northern, southernlimb and the hinge zone. Therefore, we discard a late Carboniferous oroclinal origin for the Central Iberian curve.

AB - The Variscan mountain belt in Iberia defines a large “S” shape with the Cantabrian Orocline in the north and theCentral Iberian curve, an alleged orocline belt of opposite curvature, to the south. The Cantabrian Orocline is kinematicallywell constrained, but the geometry and kinematics of the Central Iberian curve are still controversial.Here, we investigate the kinematics of the Central Iberian curve, which plays an important role in the amalgamationof Pangea since it may have accommodated much of the post-collisional deformation.We have performed apaleomagnetic study on Carboniferous granitoids and Cambrian limestones within the hinge of the curve. Ourpaleomagnetic and rock magnetic results show a primary magnetization in the granitoids and a widespreadCarboniferous remagnetization of the limestones. Syn-kinematic granitoids show ca. 70° counter-clockwise rotationsconsistent with the southern limb of the Cantabrian Orocline. Post-kinematic granitoids and Cambrian limestonesshow consistent inclinations but very scattered declinations suggesting that they were magnetizedcoevally to and after the ~70° rotation. Our results show no differential rotations between northern, southernlimb and the hinge zone. Therefore, we discard a late Carboniferous oroclinal origin for the Central Iberian curve.

U2 - 10.1016/j.gr.2016.06.016

DO - 10.1016/j.gr.2016.06.016

M3 - Article

SN - 1342-937X

VL - 39

SP - 96

EP - 113

JO - Gondwana Research

JF - Gondwana Research

ER -

Paleomagnetism of the Central Iberian curve's putative hinge: Too many oroclines in the Iberian Variscides

Abstract

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