Definition of tectonic elements in Tehuantepec, southeast Mexico: An integrated geophysical, geochronological, and stratigraphic perspective

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AudienciaPúblico en generales_ES
CoberturaMéxicoes_ES
Fecha de ingreso2026-10-05T16:34:11Z
Fecha de publicación2019-01-01
ResumenWe redefine the “Chontal arc” of the southern Isthmus of Tehuantepec, Mexico, as the Chontal allochthon. The Chontal assemblage is composed of Upper Cretaceous low-grade metavolcanic and metasedimentary rocks included in the Chivela lithodeme. By means of field observations, laser-ablation detrital zircon geochronology, and trace-element geochemistry, we constrained the provenance and tectonic setting of these rocks. We concluded that they form an allochthon emplaced during a Paleogene transpressive event. Basement structure in the greater Oaxaca-Chiapas area was assessed by qualitative interpretation of Mexican State aeromagnetic maps. Chivela lithodeme sediments include a contribution from Albian–Turonian volcanic arc rocks no longer present in the region, likely sourced from the Chortís block or from the Greater Antilles Arc as it collided with southern Yucatan. Maastrichtian basic intrusive units, basalt flows, and pillow lavas with pelagic sediments in the Chontal are subalkaline, plotting in the normal mid-ocean-ridge basalt (N-MORB) field of discrimination diagrams. The igneous rocks are interpreted as pertaining either to the inception of the paleo–Motagua fault zone (left step in the fault trace), or to local backarc extension behind the Chortís block just before it began to migrate eastward, in a basin we call the Chontal basin. The Chontal allochthon was thrust northward onto parautochthonous strata flanking the Mixtequita and Chiapas Massif basements. Chontal allochthon rocks were later intruded by Miocene granitoids related to the inception of Cocos plate subduction arc magmatism. Rocks of the Chontal allochthon have been previously linked to the Cuicateco belt of eastern Oaxaca, but this is challenged here on the basis of lithologic type, chronology, tectonic associations, structural styles, and discontinuous anomaly trends in aeromagnetic maps.es_ES
Doihttps://doi.org/10.1130/2020.2546(14)es_ES
URIhttps://riuat.uat.edu.mx/handle/123456789/5954
Idiomaenes_ES
EditorialGeological Society of Americaes_ES
RelaciónSpecial Paper of the Geological Society of Americaes_ES
URL relacionadohttps://doi.org/10.1130/2020.2546(14)es_ES
DerechosAcceso restringido / Suscripción (Metadatos de producción científica)es_ES
Licenciahttp://purl.org/coar/access_right/c_16eces_ES
FuenteSpecial Paper of the Geological Society of America
TítuloDefinition of tectonic elements in Tehuantepec, southeast Mexico: An integrated geophysical, geochronological, and stratigraphic perspectivees_ES
TipoCapítulo Libroes_ES
ArbitradoHa sido Arbitradoes_ES
AutorMolina Garza, Roberto S.
AutorPindell, James
AutorCoombs, Henry
AutorWeber, Bodo
AutorAlonso, Tomás Peña
AutorMolina Garza, Roberto S.es_ES
AutorPindell, Jameses_ES
AutorCoombs, Henryes_ES
AutorWeber, Bodoes_ES
AutorAlonso, Tomás Peñaes_ES
InstituciónUniversidad Autónoma de Tamaulipas
InstituciónUniversidad Autónoma de Tamaulipases_ES
URL relacionadahttps://doi.org/10.1130/2020.2546(14)
Tipo de artículoIndexado
Tipo de artículoIndexadoes_ES
Volumen546es_ES

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