Palaeomagnetism of Late Miocene to Quaternary volcanics from the eastern segment of the Trans-Mexican Volcanic Belt

Ruiz-Martínez, V. C.; Osete, M. L.; Vegas, R.; Núñez-Aguilar, J.I; Urrutia‐Fucugauchi, J.; Tarling, D. H.

doi:10.1016/s0040-1951(99)00313-3

Cited by 20 publications

(30 citation statements)

References 37 publications

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“…This issue depends critically on a set of data of latitude 20°N. Published directional data from Trans Mexican Volcanic Belt (TMVB) meeting some very basic selection criteria (Herrero-Bervera et al, 1986;Ruiz-Martinez et al, 2000;Osete et al, 2000, Morales et al, 2001, Alva-Valdivia et al, 2001Mejia et al, 2005;Petronille et al, 2005, Rodriguez-Ceja et al, 2006 show an unusually high degree of scatter, which might be due to genuine geomagnetic field behavior.…”

Section: Introductionmentioning

confidence: 99%

Paleomagnetic and rock-magnetic survey of Brunhes lava flows from Tancitaro volcano, Mexico

Peña

Goguitchaichvili

Monroy

et al. 2009

GeofInt

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ResumenEste estudio presenta los resultados paleomagnéticos del Volcán Tancitaro, (perteneciente al Campo Volcánico Michoacán Guanajuato), en el oeste de México, como una contribución a la base de datos de promediados en el tiempo del campo global. Se realizó el estudio paleomagnético y de magnetismo de roca en once flujos de lava. Se colectaron 120 núcleos orientados en el volcán Tancitaro y sus áreas aledañas. Todos los sitios fueron previamente fechados por 40 Ar (Ownby et al., 2007,) y van desde 793 ka hasta el presente. Se realizaron experimentos de magnetismo de roca, curvas de susceptibilidad e histéresis magnética y en la mayoría de los casos la remanencia magnética fue por la presencia de titanomagnetita pobre en Titanio con estructura magnética de pseudodominio simple. Ocho de los once flujos de lava dieron polaridad normal, mientras que los tres restantes produjeron paleodirecciones inconsistentes y no se tomaron en cuenta para el análisis y se debió probablemente por efectos de rayos. La paleodirección principal obtenida de los ocho flujos es Inc=39.5º, Dec= 356.4º, k=29, α 95 =9.1º lo cual corresponde a la posición del polo con Plat=84.4º, Plong=219.9º, K=33 y α 95 =8.5º. Esta dirección es prácticamente consistente con la paleodirección esperada del Plio Cuaternario, derivada del polo de referencia para el Craton Norteamericano. La variación paleosecular coincide con otros estudios de la misma latitud y con modelos estadísticos recientes. La inclinación media cae dentro de la incertidumbre del Eje Dipolar Geomagnético más 5% de contribuciones cuadrupolares. AbstractThis study presents paleomagnetic results from Tancitaro volcanism in the Michoacan Guanajuato Volcanic Field, western Mexico, as a contribution to the time averaged field global database. Detailed paleomagnetic and rock-magnetic studies were carried out on eleven independent lava flows; 120 oriented, standard paleomagnetic cores were collected from Tancitaro volcano and surrounding areas. All sites were dated by means of 40 Ar-39 Ar (Ownby et al., 2007) as originating from 793 ka to present. Rock-magnetic experiments included continuous susceptibility and hysteresis measurements. Remanence is carried mostly by Ti-poor titanomagnetite of pseudosingle-domain magnetic structure. Eight out of eleven flows yield normal magnetic polarities while three sites yielded inconsistent paleodirections most probably due to lightning. Mean paleodirection from eight flows is Inc=39.5°, Dec=356.4°, k=29, α 95 =9.1° which corresponds to a pole position with Plat=84.4°, Plong=219.9°, K=33 and A 95 =8.5°, practically undistinguishable from expected Plio-Quaternary paleodirections, for the North American Craton. Paleosecular variation is compatible with other studies at the same latitude bands and with recent statistical models. The mean inclination falls within the uncertainties of the Geomagnetic Axial Dipole plus 5% quadrupolar contributions.

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Section: Introductionmentioning

confidence: 99%

Paleomagnetic and rock-magnetic survey of Brunhes lava flows from Tancitaro volcano, Mexico

Peña

Goguitchaichvili

Monroy

et al. 2009

GeofInt

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“…However, to date, no specific paleomagnetic investigation has focused on EAP vol- canics. Some of the earlier investigations (Bohnel and Negendank, 1981;Ruiz-Martinez et al, 2000) are limited to the Palma Sola massif, which has been considered to be the eastern part of the TMVB. Paleomagnetic studies of the Plio-Quaternary volcanic sequences have focused on the paleosecular variation (PSV) characteristics for Central Mexico, with contrasting conclusions in terms of the amount of paleosecular variation as estimated by the angular dispersion of virtual geomagnetic poles (VGP).…”

Section: Introductionmentioning

confidence: 99%

Paleomagnetism of the Eastern Alkaline Province (Mexico): contribution to the time-averaged field global database and geomagnetic instability time scale

Goguitchaichvili

Pétronille²,

Bernard³

et al. 2007

Earth Planet Sp

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We report a detailed paleomagnetic and rock-magnetic study of 19 independent lava flows belonging to the Eastern Alkaline Province (EAP) in Mexico. In total, 162 oriented samples were collected in four areas (Sierra de Tantima-Alamo, Tlanchinol, Chiconquiaco-Palma Sola and Poza Rica). All sites analyzed in this study were previously dated by means of the unspiked K-Ar geochronological method (Ferrari et al., J. Volcanol. Geotherm. Res., 146, 284-306, 2005) and span from 14.6 to 1.5 Ma. Rock-magnetic experiments point to simple magnetic mineralogy. In most cases, the remanence is carried by Ti-poor titanomagnetite of pseudosingle-domain grain size. In a few cases, Ti-rich titanomagnetites are responsible for the magnetization. The characteristic paleodirections are successfully isolated for all of the studied units. The mean paleodirection, discarding two intermediate polarity sites, is D=359.5• , I =32.9• , n=17, k=30, α 95 =6.7• . This direction is practically undistinguishable from the expected Mio-Pliocene paleodirections, as derived from reference poles for the North American polar wander curve, and is in agreement with the previously reported directions from the western Trans-Mexican Volcanic Belt. This suggests that no major tectonic rotation occurred in studied area since the middle Miocene to Present. The paleosecular variation is estimated through the study of the scatter of virtual geomagnetic poles, giving S F =12.7 with S U =16.5 and S L =10.3 (upper and lower limits, respectively). These values are consistent with those predicted by the latitude-dependent variation model of McFadden et al. (Geophys. Res., 93, 11583-11588, 1991) for the last 5 Myr. Eleven sites yielded reverse magnetic polarity, six are normally magnetized and two lava flows provided apparently intermediate paleodirections. An interesting feature of the paleomagnetic record obtained from EAP volcanics is that two independent lava flows, dated as 2.04±0.04 and 1.97±0.04 Ma, respectively, both yield normal paleodirections during the reverse Matuyama period. These sites were apparently formed during the Réunion geomagnetic event worldwide observed.

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“…This assumed safe period of time is invalid where fast moving plates carry the lavas across lines of latitude [ Yamamoto et al , 2002], or where rotations of continental blocks occur over a short time [e.g., Luyendyk , 1991]. Tectonic rotations appear to be a particular problem in the TMVB [ Ruiz‐Martinez et al , 2000] which lead us to restrict the analysis of the paleomagnetic field in this area to the past 2 Myr. In this study our results from the TMVB were analyzed along with data compiled from previous studies, thus updating the compilation by Böhnel et al [1990].…”

Section: Introductionmentioning

confidence: 99%

Paleosecular variation and time‐averaged field recorded in late Pliocene–Holocene lava flows from Mexico

Mejia

Böhnel

Opdyke

et al. 2005

Geochem Geophys Geosyst

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[1] This paper presents results from 13 paleomagnetic sites from an area west of Mexico City and 7 sites from an area of dispersed monogenetic volcanism in the state of San Luis Potosi, accompanied by seven 40 Ar/ 39 Ar radiometric dates. An analysis of secular variation and time-averaged paleomagnetic field in the Trans-Mexican Volcanic Belt (TMVB), using compiled data both newly obtained and from the literature, is presented. Interpretation can best be constrained after excluding from the data set sites that appear to be tectonically affected. The selected data include 187 sites of late Pliocene-Holocene age. The mean direction among these sites is Dec = 358.8°, Inc = 31.6°, a 95 = 2.0°, k = 29. This direction does not overlap the expected geocentric axial dipole (GAD) but is consistent with a GAD plus a 5% quadrupole. The virtual geomagnetic pole scatter of this group of sites (12.7°, with lower and upper 95% confidence limits of 11.9°and 14.1°) is consistent with the value expected from Model G (13.6°).

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Palaeomagnetism of Late Miocene to Quaternary volcanics from the eastern segment of the Trans-Mexican Volcanic Belt

Abstract: Miocene. These new palaeomagnetic data support the idea that the eastern TMVB since the late Miocene, has been a zone of extension with a little, left-lateral shear component.

Cited by 20 publications

References 37 publications

Paleomagnetic and rock-magnetic survey of Brunhes lava flows from Tancitaro volcano, Mexico

Paleomagnetic and rock-magnetic survey of Brunhes lava flows from Tancitaro volcano, Mexico

Paleomagnetism of the Eastern Alkaline Province (Mexico): contribution to the time-averaged field global database and geomagnetic instability time scale

Paleosecular variation and time‐averaged field recorded in late Pliocene–Holocene lava flows from Mexico

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