000078836 001__ 78836
000078836 005__ 20200117221631.0
000078836 0247_ $$2doi$$a10.1016/j.tecto.2018.04.007
000078836 0248_ $$2sideral$$a105932
000078836 037__ $$aART-2018-105932
000078836 041__ $$aeng
000078836 100__ $$aCalvín, P.
000078836 245__ $$aExtensional vs. compressional deformation in the Central High Atlas salt province: A paleomagnetic approach
000078836 260__ $$c2018
000078836 5060_ $$aAccess copy available to the general public$$fUnrestricted
000078836 5203_ $$aIn this paper we address the problem of the distinction between diapiric, salt-driven and compressional structures, using the outstanding example of the Central High Atlas (Morocco). A remagnetized component carried by magnetite has been isolated in 32 new paleomagnetic sites. It is characterized by: maximum unblocking temperatures around 450 °C, syn-folding behavior and normal polarity. These 33 mean paleomagnetic directions were analyzed together with other 68 from published works around the study area to construct a robust paleomagnetic dataset along a cross-section perpendicular to the main structures. The remagnetization direction (n: 100, Dec: 332.2°, Inc: 34.5°, ¿: 6.2°, ¿: 2.0°, A/n: 6.427°) and the paleo-dip of beds (the attitude of the beds at the remagnetization occurrence) were calculated through small circle methods. The remagnetization can be dated as ca. 100 Ma. Because of its occurrence between the extensional and compressional periods, this remagnetization offers the possibility of restore the basin to its pre-inversion geometry. Comparison between present-day and pre-inversion structure allows discriminating three different evolutionary patterns: (i) thrusted and welded salt-walls mainly structured during the extensional stage (Ikkou ridge) with steep limbs close to the salt-wall core. (ii) Jurassic salt-walls with weaker deformation, restricted to the areas adjacent to the structure (Tadaghmamt and Timedouine); in this case, Cenozoic compression is limited to welding of the salt-walls and buttressing of the sedimentary sequences against faults. (iii) salt-rollers gently initiated during the Jurassic (Toumliline diapir), thrusted during the Cenozoic compression. Results show the importance of salt tectonics both during extension and compression, as well as the control of the compressional features by the inherited extensional structures. The performed restorations prove that paleomagnetism is a useful, independent tool to obtain palinspastic restorations and to separate, and quantify, the imprint generated during the basinal stage from the inversional features.
000078836 536__ $$9info:eu-repo/grantAgreement/ES/MINECO/BES-2013-062988$$9info:eu-repo/grantAgreement/ES/MINECO-FEDER/CGL2012-38481$$9info:eu-repo/grantAgreement/ES/MINECO-FEDER/CGL2016-77560
000078836 540__ $$9info:eu-repo/semantics/openAccess$$aby-nc-nd$$uhttp://creativecommons.org/licenses/by-nc-nd/3.0/es/
000078836 590__ $$a2.764$$b2018
000078836 591__ $$aGEOCHEMISTRY & GEOPHYSICS$$b34 / 84 = 0.405$$c2018$$dQ2$$eT2
000078836 592__ $$a1.481$$b2018
000078836 593__ $$aGeophysics$$c2018$$dQ1
000078836 593__ $$aEarth-Surface Processes$$c2018$$dQ1
000078836 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/acceptedVersion
000078836 700__ $$0(orcid)0000-0003-3652-3527$$aCasas-Sainz, A.M.$$uUniversidad de Zaragoza
000078836 700__ $$aVillalaín, J.J.
000078836 700__ $$aMoussaid, B.
000078836 7102_ $$12000$$2428$$aUniversidad de Zaragoza$$bDpto. Ciencias de la Tierra$$cÁrea Geodinámica Interna
000078836 773__ $$g734-735 (2018), 130-147$$pTectonophysics$$tTECTONOPHYSICS$$x0040-1951
000078836 8564_ $$s329143$$uhttps://zaguan.unizar.es/record/78836/files/texto_completo.pdf$$yPostprint
000078836 8564_ $$s48018$$uhttps://zaguan.unizar.es/record/78836/files/texto_completo.jpg?subformat=icon$$xicon$$yPostprint
000078836 909CO $$ooai:zaguan.unizar.es:78836$$particulos$$pdriver
000078836 951__ $$a2020-01-17-22:00:02
000078836 980__ $$aARTICLE