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<datestamp>2018-01-11</datestamp>
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<publisher>HAL CCSD</publisher>
<title lang=en>Palaeomagnetism of the upper volcanic supergroup, southern part of the Sierra Madre Occidental, Mexico</title>
<creator>Perrin, Mireille</creator>
<creator>Alva-Valdivia, L. M.</creator>
<creator>Lopez-Martinez, M.</creator>
<creator>Rosas-Elguera, J.</creator>
<creator>Benammi, M.</creator>
<creator>Gonzalez-Rangel, J. A.</creator>
<creator>Camps, Pierre</creator>
<contributor>Centre européen de recherche et d'enseignement de géosciences de l'environnement (CEREGE) ; Institut de Recherche pour le Développement (IRD) - Aix Marseille Université (AMU) - Collège de France (CdF) - Institut national des sciences de l'Univers (INSU - CNRS) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Universidad Nacional Autónoma de México (UNAM)</contributor>
<contributor>Departamento de Geologia CICESE ; Centro de Investigacion Cientifica y de Education Superior de Ensenada [Mexico] (CICESE)</contributor>
<contributor>Universidad de Guadalajara</contributor>
<contributor>Institut International de Paléoprimatologie, Paléontologie Humaine : Evolution et Paléoenvironnement (IPHEP) ; Centre National de la Recherche Scientifique (CNRS) - Université de Poitiers</contributor>
<contributor>Manteau et Interfaces ; Géosciences Montpellier ; Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS) - Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<description>International audience</description>
<source>ISSN: 0956-540X</source>
<source>EISSN: 1365-246X</source>
<source>Geophysical Journal International</source>
<publisher>Oxford University Press (OUP)</publisher>
<identifier>hal-00854457</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-00854457</identifier>
<source>https://hal.archives-ouvertes.fr/hal-00854457</source>
<source>Geophysical Journal International, Oxford University Press (OUP), 2013, 193 (3), pp.1250-1264. 〈10.1093/gji/ggt079〉</source>
<identifier>DOI : 10.1093/gji/ggt079</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1093/gji/ggt079</relation>
<language>en</language>
<subject lang=en>Palaeointensity</subject>
<subject lang=en>Palaeomagnetism applied to tectonics</subject>
<subject lang=en>Rock and mineral magnetism</subject>
<subject>[SDU.STU.GP] Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph]</subject>
<subject>[PHYS.PHYS.PHYS-GEO-PH] Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph]</subject>
<subject>[SDE.MCG] Environmental Sciences/Global Changes</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>Ash flow tuffs, or ignimbrites have been recently proposed to be a good material for palaeointensity determination. In this paper, we present a multidisciplinary study, combining geochronology, petrology, rock magnetism and palaeomagnetism, carried out on Oligocene to Early Miocene ignimbrites and related flows from the southern part of the Sierra Madre Occidental. Two new 40Ar/39Ar ages were determined for ignimbrites; 20.4 ± 0.2 Ma (the youngest age obtained so far in this area) and 29.2 ± 0.5 Ma. Density measurements, as a proxy for welding, proved to be extremely useful to estimate the emplacement temperature and the origin of the magnetizations carried by the ignimbrites. After alternating field and thermal demagnetizations, the mean palaeomagnetic pole (Lat = 66.8°N; Long = 180.5°E; Kappa = 142; A95 = 6.3°), calculated for the period 28-31 Ma, is in close agreement with our only Miocene determination. Comparison with the North America Synthetic Apparent Polar Path indicates a net counter-clockwise vertical axis rotation of about 10 ± 4° compared to stable North America, which occurred likely during the last extensional episode in the Late Miocene (ca. 12-9 Ma). Palaeointensity estimates, obtained with the Thellier-Coe method, are mainly questionable and should not be used for global interpretation. Therefore, these ignimbrites are not a viable material for reliable palaeointensity determinations.</description>
<date>2013-06</date>
</dc>
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