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561.#.#.u: http://www.geofisica.unam.mx/

650.#.4.x: Físico Matemáticas y Ciencias de la Tierra

336.#.#.b: info:eu-repo/semantics/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

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856.4.0.u: http://revistagi.geofisica.unam.mx/index.php/RGI/article/view/1069/1049

100.1.#.a: Gilbert, C. M.; E.Carmichael., I. S.; Mahood., G. A.

524.#.#.a: Gilbert, C. M., et al. (1985). Volcanic stratigraphy of the Guadalajara area, Mexico. Geofísica Internacional; Vol. 24 No. 1, 1985. Recuperado de https://repositorio.unam.mx/contenidos/42048

245.1.0.a: Volcanic stratigraphy of the Guadalajara area, Mexico

502.#.#.c: Universidad Nacional Autónoma de México

561.1.#.a: Instituto de Geofísica, UNAM

264.#.0.c: 1985

264.#.1.c: 2012-12-19

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-ND 4.0 Internacional, https://creativecommons.org/licenses/by-nc-nd/4.0/legalcode.es, fecha de asignación de la licencia 2012-12-19, para un uso diferente consultar al responsable jurídico del repositorio por medio de revistagi@igeofisica.unam.mx

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041.#.7.h: spa

520.3.#.a: Two ignimbrites of petrologic interest provide distinctive time horizons in the volcanic succession near Guadalajara. The older of the two, referred to as San Gaspar ignimbrite, is approximately 4.8 million years old and has the composition of dacitic andesite. The younger ignimbrite, called Guadalajara ignimbrite because of its use as the characteristic building stone in the city, is more siliceous and approximately 3.3 million yearsold. In the formation of both ignimbrites, two contrasting magmas were erupted simultaneously, for each rock contains glass fragments of two distinct compositions. In some fiamme, the two glasses are intricately intermixed.The San Gaspar ignimbrite is widespread, thin, firmly welded throughout, and characterized by numerous fiamme of porphyritic dark glass containing abundant phenocrysts of plagioclase, augite, hypersthene, hornblende and biotite. Dark glass (R. I.= 1.521) is the predominant phase in the rock, but all samples contain shards and small fiamme of colorless glass (R.l_.= 1.510) that contains approximately 5 percent more SÍOâ‚‚ and significantly less CaO, MgO, and FeO than the dark glass. Microprobe analyses of ferromagnesian phenocrysts indicate pre-eruptive magma temperaturas of about 1000°C. Conversion of common hornblende to basaltic hornblende at the top of the ignimbrite signifies an emplacement temperature greater than 800°C.Late vesiculation of the larger fiamme, following compaction and welding, is characteristic.The Guadalajara ignimbrite is characterized by abundant fiamme of two distinct compositions. Vitric facies consist of two different glasses in nearly equal proportions, one colorless and aphyric, the other dark-colored with sparse phenocrysts of alkali feldspar. Generally, however, the ignimbrite has been completely. devitrified, the light-colored fiamme being axiolitic and the darker porphyritic fiamme cryptocrystalljne and vesicular.East and southeast of Guadalajara, the terrane beneath the San Gaspar ignimbrite consists largely of basaltic flows, but to the northwest rhyolitic rocks are widespread. An olivine basalt distinguished by megaphenocrysts of plagioclase overlies the ignimbrite north of Guadalajara and provides a recognizable horizon about 4 million years old. To the west, the younger Guadalaiara ignimbrite is overlain by siliceous ash flows and dacitic lavas about 3 million years old.Younger volcanism has been concentrated along a northwest-trending zone where activity has continued since late Pliocene time, culminating at Sierra La Primavera during the last 140 000 years with eruptions of high-silica rhyolite. Elsewhere the young eruptions have produced flow of basalt and basaltic andesite

773.1.#.t: Geofísica Internacional; Vol. 24 No. 1 (1985)

773.1.#.o: http://revistagi.geofisica.unam.mx/index.php/RGI

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022.#.#.a: 0016-7169

310.#.#.a: Trimestral

264.#.1.b: Instituto de Geofísica, UNAM

758.#.#.1: http://revistagi.geofisica.unam.mx/index.php/RGI

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Artículo

Volcanic stratigraphy of the Guadalajara area, Mexico

Gilbert, C. M.; E.Carmichael., I. S.; Mahood., G. A.

Instituto de Geofísica, UNAM, publicado en Geofísica Internacional, y cosechado de Revistas UNAM

Licencia de uso

Procedencia del contenido

Entidad o dependencia
Instituto de Geofísica, UNAM
Revista
Repositorio
Contacto
Revistas UNAM. Dirección General de Publicaciones y Fomento Editorial, UNAM en revistas@unam.mx

Cita

Gilbert, C. M., et al. (1985). Volcanic stratigraphy of the Guadalajara area, Mexico. Geofísica Internacional; Vol. 24 No. 1, 1985. Recuperado de https://repositorio.unam.mx/contenidos/42048

Descripción del recurso

Autor(es)
Gilbert, C. M.; E.Carmichael., I. S.; Mahood., G. A.
Tipo
Artículo de Investigación
Área del conocimiento
Físico Matemáticas y Ciencias de la Tierra
Título
Volcanic stratigraphy of the Guadalajara area, Mexico
Fecha
2012-12-19
Resumen
Two ignimbrites of petrologic interest provide distinctive time horizons in the volcanic succession near Guadalajara. The older of the two, referred to as San Gaspar ignimbrite, is approximately 4.8 million years old and has the composition of dacitic andesite. The younger ignimbrite, called Guadalajara ignimbrite because of its use as the characteristic building stone in the city, is more siliceous and approximately 3.3 million yearsold. In the formation of both ignimbrites, two contrasting magmas were erupted simultaneously, for each rock contains glass fragments of two distinct compositions. In some fiamme, the two glasses are intricately intermixed.The San Gaspar ignimbrite is widespread, thin, firmly welded throughout, and characterized by numerous fiamme of porphyritic dark glass containing abundant phenocrysts of plagioclase, augite, hypersthene, hornblende and biotite. Dark glass (R. I.= 1.521) is the predominant phase in the rock, but all samples contain shards and small fiamme of colorless glass (R.l_.= 1.510) that contains approximately 5 percent more SÍOâ‚‚ and significantly less CaO, MgO, and FeO than the dark glass. Microprobe analyses of ferromagnesian phenocrysts indicate pre-eruptive magma temperaturas of about 1000°C. Conversion of common hornblende to basaltic hornblende at the top of the ignimbrite signifies an emplacement temperature greater than 800°C.Late vesiculation of the larger fiamme, following compaction and welding, is characteristic.The Guadalajara ignimbrite is characterized by abundant fiamme of two distinct compositions. Vitric facies consist of two different glasses in nearly equal proportions, one colorless and aphyric, the other dark-colored with sparse phenocrysts of alkali feldspar. Generally, however, the ignimbrite has been completely. devitrified, the light-colored fiamme being axiolitic and the darker porphyritic fiamme cryptocrystalljne and vesicular.East and southeast of Guadalajara, the terrane beneath the San Gaspar ignimbrite consists largely of basaltic flows, but to the northwest rhyolitic rocks are widespread. An olivine basalt distinguished by megaphenocrysts of plagioclase overlies the ignimbrite north of Guadalajara and provides a recognizable horizon about 4 million years old. To the west, the younger Guadalaiara ignimbrite is overlain by siliceous ash flows and dacitic lavas about 3 million years old.Younger volcanism has been concentrated along a northwest-trending zone where activity has continued since late Pliocene time, culminating at Sierra La Primavera during the last 140 000 years with eruptions of high-silica rhyolite. Elsewhere the young eruptions have produced flow of basalt and basaltic andesite
Idioma
spa
ISSN
0016-7169

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