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

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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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