dor_id: 4132440
506.#.#.a: Público
590.#.#.d: Los artículos enviados a la revista "Geofísica Internacional", se juzgan por medio de un proceso de revisión por pares
510.0.#.a: Consejo Nacional de Ciencia y Tecnología (CONACyT); Scientific Electronic Library Online (SciELO); SCOPUS, Dialnet, Directory of Open Access Journals (DOAJ); Geobase
561.#.#.u: https://www.geofisica.unam.mx/
650.#.4.x: Físico Matemáticas y Ciencias de la Tierra
336.#.#.b: article
336.#.#.3: Artículo de Investigación
336.#.#.a: Artículo
351.#.#.6: http://revistagi.geofisica.unam.mx/index.php/RGI
351.#.#.b: Geofísica Internacional
351.#.#.a: Artículos
harvesting_group: RevistasUNAM
270.1.#.p: Revistas UNAM. Dirección General de Publicaciones y Fomento Editorial, UNAM en revistas@unam.mx
590.#.#.c: Open Journal Systems (OJS)
270.#.#.d: MX
270.1.#.d: México
590.#.#.b: Concentrador
883.#.#.u: https://revistas.unam.mx/catalogo/
883.#.#.a: Revistas UNAM
590.#.#.a: Coordinación de Difusión Cultural
883.#.#.1: https://www.publicaciones.unam.mx/
883.#.#.q: Dirección General de Publicaciones y Fomento Editorial
850.#.#.a: Universidad Nacional Autónoma de México
856.4.0.u: http://revistagi.geofisica.unam.mx/index.php/RGI/article/view/470/484
100.1.#.a: Webbert, Karen L.; Fernandez, Louis A.; Simmons, Wm. B.
524.#.#.a: Webbert, Karen L., et al. (1994). Geochemistry and mineralogy of the Eocene-Ogligocene volcanic sequence, Southern Sierra Madre Occidental, Juchipila, Zacatecas, Mexico. Geofísica Internacional; Vol. 33 Núm. 1: Enero 1, 1994; 77-89. Recuperado de https://repositorio.unam.mx/contenidos/4132440
245.1.0.a: Geochemistry and mineralogy of the Eocene-Ogligocene volcanic sequence, Southern Sierra Madre Occidental, Juchipila, Zacatecas, Mexico
502.#.#.c: Universidad Nacional Autónoma de México
561.1.#.a: Instituto de Geofísica, UNAM
264.#.0.c: 1994
264.#.1.c: 1994-01-01
653.#.#.a: Sierra Madre Occidental; tobas de flujos de cenizas; riolita; andesita; feldspato de bario; Sierra Madre Occidental; ash-flow tuff; rhyolite; andesite; barium feldspar
506.1.#.a: La titularidad de los derechos patrimoniales de esta obra pertenece a las instituciones editoras. Su uso se rige por una licencia Creative Commons BY-NC-SA 4.0 Internacional, https://creativecommons.org/licenses/by-nc-sa/4.0/legalcode.es, para un uso diferente consultar al responsable jurídico del repositorio por medio del correo electrónico revistagi@igeofisica.unam.mx
884.#.#.k: http://revistagi.geofisica.unam.mx/index.php/RGI/article/view/470
001.#.#.#: 063.oai:revistagi.geofisica.unam.mx:article/470
041.#.7.h: spa
520.3.#.a: The Sierra Madre Occidental (SMO) volcanic province of western Mexico is a remnant of a broad continental-margin orogenic belt formed as a result of mid-Tertiary subduction of the Farallon plate beneath Mexico. The most voluminous rocs exposed in the SMO are rhyolitic ash-flow tuffs (AFT) erupted throughout most of the providence from 36 to 27 Ma. Two other magmatic episodes recorded in the SMO include an Eocene event (53-40 Ma) characterized by mafic-intermediate composition lava flows, and a post-ignimbrite event (29-20 Ma) characterized by the eruption of extension-related basaltic-andesites. This paper presents new data for an area in the southem SMO wich has evidence for both Eocene and Oligocene volcanism. Te stratigraphic sequence established for the area near Juchipila, Zacatecas, consists of Eocene basaltic andesite to andesite lava flows wich are uncomfortably overlain by Oligocene basalt to basaltic lava flows and/or Oligocene rhyolitic ash-flow tuffs. An upper sequence of basalt to andesite lava flows caps the section. The high-K calc-alkaline Oligocene sequence is composed predominantly of rhyolitic AFT (~25 Ma) wich are younger than most other reported SMO occurrences. This suggest a younging to the south of SMO volcanism. Although Juchipila AFT are phenocryst poor, one widespread AFT unit is characterized by alkali feldspar with unusually Ba-rich cores (up to 14% celsian component). This is the first reported occurrence for this composition feldspar in the SMO.doi: https://doi.org/10.22201/igeof.00167169p.1994.33.1.541
773.1.#.t: Geofísica Internacional; Vol. 33 Núm. 1: Enero 1, 1994; 77-89
773.1.#.o: http://revistagi.geofisica.unam.mx/index.php/RGI
022.#.#.a: ISSN-L: 2954-436X; ISSN impreso: 0016-7169
310.#.#.a: Trimestral
300.#.#.a: Páginas: 77-89
264.#.1.b: Instituto de Geofísica, UNAM
doi: https://doi.org/10.22201/igeof.00167169p.1994.33.1.541
handle: 0099c7f1c23326e0
harvesting_date: 2023-06-20 16:00:00.0
856.#.0.q: application/pdf
file_creation_date: 2008-02-22 16:57:43.0
file_modification_date: 2022-07-05 18:37:24.0
file_creator: Karen L. Webbert
file_name: 557891d45275d5dbfd76b8b1191e33e64c785727e4ec89b08519cf276a5680e0.pdf
file_pages_number: 13
file_format_version: application/pdf; version=1.6
file_size: 7171937
245.1.0.b: Geochemistry and mineralogy of the Eocene-Ogligocene volcanic sequence, Southern Sierra Madre Occidental, Juchipila, Zacatecas, Mexico
last_modified: 2023-06-20 16:00:00
license_url: https://creativecommons.org/licenses/by-nc-sa/4.0/legalcode.es
license_type: by-nc-sa
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