dor_id: 4133390

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/1151/1079

100.1.#.a: Kudo, A. M.; Jackson, M. E.; Husler, J. W.

524.#.#.a: Kudo, A. M., et al. (1985). Phase chemistry of recent andesite, dacite, and rhyodacite of volcan Pico de Orizaba, Mexican Volcanic Belt: evidence for xenolitic contamination. Geofísica Internacional; Vol. 24 Núm. 4: Octubre 1, 1985; 679-689. Recuperado de https://repositorio.unam.mx/contenidos/4133390

245.1.0.a: Phase chemistry of recent andesite, dacite, and rhyodacite of volcan Pico de Orizaba, Mexican Volcanic Belt: evidence for xenolitic contamination

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

561.1.#.a: Instituto de Geofísica, UNAM

264.#.0.c: 1985

264.#.1.c: 1985-10-01

653.#.#.a: Pico de Orizaba; Cinturón Volcánico Mexicano; Contaminación xenolítica; Pico de Orizaba; Xenolotic Contamination; Mexican Volcanic Belt

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/1151

001.#.#.#: 063.oai:revistagi.geofisica.unam.mx:article/1151

041.#.7.h: spa

520.3.#.a: Volcan Pico de Orizaba, the highest volcano of the Mexican Volcanic Belt, evolved through three distinct magmatic stages beginning about 1.5 Ma (Robin and Cantagrel, 1982). Two-pyroxene andesites, dacites, and rhyodacite from the third tage (<13 000 y. B.P.) have been analyzed by X-ray fluorescence and electron microprobe. Sample hav been collected above 4 500 m from lava flows and pyroclastic fall and flow deposits.At least two types of andesite occur. An olivine-bearing andesite (60% SiO2) with over 20 volume percent plagioclase and 15 percent pyroxene phenocryst has a glassy groundmass with 61 weight percent SiO2, 17.7% AI2O3, 4.8% Na2O, and 2.5% K2O; surprisingly, these andesites contain a few grains of corroded olivine which are F-rich (Fo87. 89) with inclusion of chromian spinel. The pyroxene compositions are bimodal with distinct compositional gap; two group of orthopyroxene average En79Fs19 Wo2 and En57 Fs4o Wo3 and those of the clinopyro ene average En50Fs11Wo39 and En44Fs18Wo38. Plagioclase rim compositions are bimodal also (An 70-78 and An46-63). Geothermometry yields temperatures above 1050°C for Mg-rich pyroxene pairs and around 960° for the Fe-rich pair. The olivine-free andesite has plagioclase core compositions which are bimodal. The dacite and rhyodacite (63 to 68% SiO2, over 16% Al2O3) have from 20 to 40% plagioclase phenocryst , 3 to 20% pyroxene, and 0 to 15% hornblende. The glassy groundmasses in these rocks and the olivine-free andsite are similar with 74 to 75% SiO2, 11.8 to 12.6% Al2O3, 2.5 to 4.0% Na2O and 2.5 to 4.4% K2O and plot near the mimmum in the ternary granite system. The mafic phases are Mg-rich ; two-pyroxne temperature over 980°C are obtained. The composition of the two pyroxenes do not appear to be compatible with the high-silica rhyolite liquid which has a liquidus temperature below 800°C.At last two liquids (a high-silica rhyolite and an andesite) have been generated in the most recent stage of the evolution of Orizaba. The andesite has been contaminated in part by Mg-rich olivines and pyroxenes, but the rhyolitic liquid have picked up mafic crustal material or material from the vents resulting in the formation of andesite , dacite and rhyodacite.

773.1.#.t: Geofísica Internacional; Vol. 24 Núm. 4: Octubre 1, 1985; 679-689

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: 679-689

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

doi: https://doi.org/10.22201/igeof.00167169p.1985.24.4.1151

handle: 3b10b0db1a0f1eb2

harvesting_date: 2023-06-20 16:00:00.0

856.#.0.q: application/pdf

file_creation_date: 2022-07-25 23:21:08.0

file_modification_date: 2022-07-26 18:50:36.0

file_creator: A.M. Kudo

file_name: 12685585f44a6758426c129973f6aa0043cc47133f185137ba3f3c16aaeffc26.pdf

file_pages_number: 12

file_format_version: application/pdf; version=1.7

file_size: 5181986

245.1.0.b: Phase chemistry of recent andesite, dacite, and rhyodacite of volcan Pico de Orizaba, Mexican Volcanic Belt: evidence for xenolitic contamination

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

No entro en nada

No entro en nada 2