000118175 001__ 118175
000118175 005__ 20220908140500.0
000118175 0247_ $$2doi$$a10.1093/gji/ggv042
000118175 0248_ $$2sideral$$a129301
000118175 037__ $$aART-2015-129301
000118175 041__ $$aeng
000118175 100__ $$0(orcid)0000-0002-5159-8140$$aIzquierdo-Llavall, Esther
000118175 245__ $$aMulti-episodic remagnetization related to deformation in the Pyrenean Internal Sierras
000118175 260__ $$c2015
000118175 5060_ $$aAccess copy available to the general public$$fUnrestricted
000118175 5203_ $$aThe Internal Sierras (IS) in the southern margin of the Western and Central Axial Zone (Southern Pyrenees) are affected by a syn-orogenic remagnetization that provides information to reconstruct deformation geometries at the time of acquisition of magnetization. Furthermore, the IS structure changes strike along its structural trend, from ∼N120 to 130°E in the western and eastern margins to ∼N070–090°E in the central part. Palaeomagnetic techniques have been used to (i) accurately define the timing of remagnetization with regard to deformation and (ii) determine if the along-strike trend variation in the IS was induced by deformation and thrust emplacement during the Pyrenean compression or, on the contrary, was the result of a primary orientation controlled by structures inherited from pre-orogenic times. From 23 new palaeomagnetic sites, collected in Upper Cretaceous marls and marly limestones, two meaningful and stable palaeomagnetic components were resolved, principally carried by magnetite: (1) a lower-temperature component (B) that unblocks between 200 °C and 325–400 °C and (2) a higher-temperature component (C) that has been successfully isolated by means of combined thermal (up to 400 °C) and AF demagnetization (generally up to 50–100 mT). The B component is a late remagnetization that post-dates folding and emplacement of basement thrust sheets in the IS (mainly the Gavarnie thrust). It supports small but statistically significant clockwise rotations in the western part of the IS (from +18 to +26°). These rotations can be attributed to the westwards shortening decrease in the thrust system below the Gavarnie unit that results from its along-strike structural change, with a higher number of basement thrusts to the east. The C component has been interpreted as an early remagnetization, based on the results of conglomerate and fold tests. This component predates basement thrusting and is diachronous across the study area: reverse and normal polarities dominate in the eastern and western margins of the IS, respectively. New and previous palaeomagnetic data point out that curvature in the IS is probably a primary feature and the along-strike change in their trend could be interpreted as the result of basement geometrical features inherited from Variscan, Late Variscan or Mesozoic times. A complex, multi-episodic remagnetization probably related to burial and deformation processes occurred during Eocene times.
000118175 536__ $$9info:eu-repo/grantAgreement/ES/MEC/FPU-AP2009-0554$$9info:eu-repo/grantAgreement/ES/MICINN/CGL2006-05817$$9info:eu-repo/grantAgreement/ES/MICINN/CGL2009-08969
000118175 540__ $$9info:eu-repo/semantics/openAccess$$aAll rights reserved$$uhttp://www.europeana.eu/rights/rr-f/
000118175 590__ $$a2.484$$b2015
000118175 591__ $$aGEOCHEMISTRY & GEOPHYSICS$$b28 / 81 = 0.346$$c2015$$dQ2$$eT2
000118175 592__ $$a1.796$$b2015
000118175 593__ $$aGeophysics$$c2015$$dQ1
000118175 593__ $$aGeochemistry and Petrology$$c2015$$dQ1
000118175 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/publishedVersion
000118175 700__ $$0(orcid)0000-0003-3652-3527$$aCasas Sainz, Antonio$$uUniversidad de Zaragoza
000118175 700__ $$0(orcid)0000-0003-1563-6434$$aOliva-Urcia, Belén
000118175 700__ $$aBurmester, Russell
000118175 700__ $$0(orcid)0000-0002-0504-2352$$aPueyo, Emilio L.$$uUniversidad de Zaragoza
000118175 700__ $$aHousen, Bernard
000118175 7102_ $$12000$$2428$$aUniversidad de Zaragoza$$bDpto. Ciencias de la Tierra$$cÁrea Geodinámica Interna
000118175 773__ $$g201 , 2 (2015), 891-914$$pGeophys. j. int.$$tGEOPHYSICAL JOURNAL INTERNATIONAL$$x0956-540X
000118175 8564_ $$s4183676$$uhttps://zaguan.unizar.es/record/118175/files/texto_completo.pdf$$yVersión publicada
000118175 8564_ $$s2679183$$uhttps://zaguan.unizar.es/record/118175/files/texto_completo.jpg?subformat=icon$$xicon$$yVersión publicada
000118175 909CO $$ooai:zaguan.unizar.es:118175$$particulos$$pdriver
000118175 951__ $$a2022-09-08-11:34:39
000118175 980__ $$aARTICLE