dor_id: 4133036

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336.#.#.b: article

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351.#.#.b: Geofísica Internacional

351.#.#.a: Artículos

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856.4.0.u: http://revistagi.geofisica.unam.mx/index.php/RGI/article/view/733/1455

100.1.#.a: Urrutia-fucugauchi, J.; Ferrusquía-villafranca, I.

524.#.#.a: Urrutia-fucugauchi, J., et al. (2001). Paleomagnetic results for the Middle-Miocene continental Suchilquitongo Formation, Valley of Oaxaca, southeastern Mexico. Geofísica Internacional; Vol. 40 Núm. 3: Julio 1, 2001; 191-205. Recuperado de https://repositorio.unam.mx/contenidos/4133036

245.1.0.a: Paleomagnetic results for the Middle-Miocene continental Suchilquitongo Formation, Valley of Oaxaca, southeastern Mexico

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

561.1.#.a: Instituto de Geofísica, UNAM

264.#.0.c: 2001

264.#.1.c: 2001-07-01

653.#.#.a: Paleomagnetismo; tectónica; fábrica magnética; Mioceno Medio; Formación Suchilquitongo; ignimbrita de Etla; Oaxaca; Paleomagnetism; tectonics; magnetic fabrics; Middle Miocene; Suchilquitongo Formation; Etla ignimbrite; Oaxaca

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884.#.#.k: http://revistagi.geofisica.unam.mx/index.php/RGI/article/view/733

001.#.#.#: 063.oai:revistagi.geofisica.unam.mx:article/733

041.#.7.h: spa

520.3.#.a: The Suchilquitongo Formation of the northeastern Valley of Oaxaca is a thick sequence of thin-bedded tuffaceous sandstones and siltstones, which locally contain Hemingfordian mammal fauna, and interbedded lacustrine limestones and rhyolitic tuffs (Etla Ignimbrite). Three new K-Ar dates of biotite and plagioclase concentrates from the Etla Ignimbrite yield an age of about 19-20 Ma. Well-defined reverse polarity paleomagnetic directions are recovered by alternating field demagnetization from 40 samples distrib- uted in 5 sites. The overall mean direction for the Suchilquitongo Formation is B = 5, Dec = 190.9°, Inc = -37.7°, a95 = 6.0°, and k = 165, and the pole position lies at 79.0° N, 330.6° E. This direction deviates from the expected direction (Dec = 176°, Inc = -30°) for the Oaxaca Valley, by a 15° clockwise discordance in declination. A double rotation correction to compensate for structural deformation using a 20° plunge and a 10° bedding dip results in a corrected direction and pole position of Dec = 178.6°, Inc = -30.9° (88.6°N, 151.5°E), which agrees within the statistical uncertainties with the expected direction. The anisotropy of magnetic suscep- tibility principal axes for the Etla Ignimbrite are characterized by large angular dispersion, which does not permit to infer the flow directions and possible source location.doi: https://doi.org/10.22201/igeof.00167169p.2001.40.3.322

773.1.#.t: Geofísica Internacional; Vol. 40 Núm. 3: Julio 1, 2001; 191-205

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300.#.#.a: Páginas: 191-205

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doi: https://doi.org/10.22201/igeof.00167169p.2001.40.3.322

handle: 00df3855153773bc

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

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file_creation_date: 2001-11-13 12:16:01.0

file_modification_date: 2022-08-11 21:26:05.0

file_creator: J. Urrutia-Fucugauchi and I. Ferrusquía-Villafranca

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245.1.0.b: Paleomagnetic results for the Middle-Miocene continental Suchilquitongo Formation, Valley of Oaxaca, southeastern Mexico

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Artículo

Paleomagnetic results for the Middle-Miocene continental Suchilquitongo Formation, Valley of Oaxaca, southeastern Mexico

Urrutia-fucugauchi, J.; Ferrusquía-villafranca, I.

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

Urrutia-fucugauchi, J., et al. (2001). Paleomagnetic results for the Middle-Miocene continental Suchilquitongo Formation, Valley of Oaxaca, southeastern Mexico. Geofísica Internacional; Vol. 40 Núm. 3: Julio 1, 2001; 191-205. Recuperado de https://repositorio.unam.mx/contenidos/4133036

Descripción del recurso

Autor(es)
Urrutia-fucugauchi, J.; Ferrusquía-villafranca, I.
Tipo
Artículo de Investigación
Área del conocimiento
Físico Matemáticas y Ciencias de la Tierra
Título
Paleomagnetic results for the Middle-Miocene continental Suchilquitongo Formation, Valley of Oaxaca, southeastern Mexico
Fecha
2001-07-01
Resumen
The Suchilquitongo Formation of the northeastern Valley of Oaxaca is a thick sequence of thin-bedded tuffaceous sandstones and siltstones, which locally contain Hemingfordian mammal fauna, and interbedded lacustrine limestones and rhyolitic tuffs (Etla Ignimbrite). Three new K-Ar dates of biotite and plagioclase concentrates from the Etla Ignimbrite yield an age of about 19-20 Ma. Well-defined reverse polarity paleomagnetic directions are recovered by alternating field demagnetization from 40 samples distrib- uted in 5 sites. The overall mean direction for the Suchilquitongo Formation is B = 5, Dec = 190.9°, Inc = -37.7°, a95 = 6.0°, and k = 165, and the pole position lies at 79.0° N, 330.6° E. This direction deviates from the expected direction (Dec = 176°, Inc = -30°) for the Oaxaca Valley, by a 15° clockwise discordance in declination. A double rotation correction to compensate for structural deformation using a 20° plunge and a 10° bedding dip results in a corrected direction and pole position of Dec = 178.6°, Inc = -30.9° (88.6°N, 151.5°E), which agrees within the statistical uncertainties with the expected direction. The anisotropy of magnetic suscep- tibility principal axes for the Etla Ignimbrite are characterized by large angular dispersion, which does not permit to infer the flow directions and possible source location.doi: https://doi.org/10.22201/igeof.00167169p.2001.40.3.322
Tema
Paleomagnetismo; tectónica; fábrica magnética; Mioceno Medio; Formación Suchilquitongo; ignimbrita de Etla; Oaxaca; Paleomagnetism; tectonics; magnetic fabrics; Middle Miocene; Suchilquitongo Formation; Etla ignimbrite; Oaxaca
Idioma
spa
ISSN
ISSN-L: 2954-436X; ISSN impreso: 0016-7169

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