dor_id: 4133097

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/187/173

100.1.#.a: Molina Garza, Roberto S.

524.#.#.a: Molina Garza, Roberto S. (2005). Paleomagnetic reconstruction of Coahuila, Mexico: The Late Triassic Acatita intrusives. Geofísica Internacional; Vol. 44 Núm. 2: Abril 1, 2005; 197-2010. Recuperado de https://repositorio.unam.mx/contenidos/4133097

245.1.0.a: Paleomagnetic reconstruction of Coahuila, Mexico: The Late Triassic Acatita intrusives

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

561.1.#.a: Instituto de Geofísica, UNAM

264.#.0.c: 2005

264.#.1.c: 2005-04-01

653.#.#.a: Paleomagnetismo; Coahuila; México; Triásico tardío; Pangea; Paleomagnetism; Mexico; Coahuila; Late Triassic; Pangea

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/187

001.#.#.#: 063.oai:revistagi.geofisica.unam.mx:article/187

041.#.7.h: spa

520.3.#.a: The Acatita plutons intrude the upper Paleozoic of Las Delicias, southern Coahuila. We collected 96 samples from 15 sites in two plutons from Valle El Sobaco and Sierra Los Remedios for paleomagnetic and 40Ar-39Ar analyses. Separates of hornblende (215.9 ±1.9 Ma, 2a confidence level), biotite (217.3 ±1.2 Ma), and K-feldspar (205.6 ±1.4 Ma) yield nearly flat age spectra although none of the data satisfy strict plateau criteria, possibly reflecting slight alteration. The preferred ages are interpreted as fairly precise records of Late Triassic cooling of the plutonic suite, which has yielded concordant U-Pb Zircon ages ca. 220 Ma. Most samples yield north-directed and steep positive magnetizations similar to the late Cenozoic expected field direction. Some samples, mostly from mafic enclaves, show northwest magnetization of shallow inclination (southeast at one site) with alternating fields above ~30 mT and thermal demagnetization above ~400°C. The overall mean direction, corrected for 15° northeast dip of the overlying lower Cretaceous strata (dec=342.7°, inc=+4.2°; k=35.4, a95=9.4°, n=8 sites) indicates moderate counterclockwise (14°±8°) rotation with respect to the Late Triassic cratonic reference (reference pole: 57.5°N / 84°E), and moderate southward displacement (7°±5°). The Acatita pole falls within a cluster of Late Triassic poles from Africa, South America, and North America as restored in North American coordinates. A major difficulty is distinguishing local, small-scale rotations, such as a gentle tilt of the pluton after magnetization, from regional events involving large-scale displacements. Rotations such as observed at Acatita are suggested by synfolding magnetizations (Eocene in age) in the transverse sector of the Sierra Madre Oriental and by primary magnetizations in Eocene volcanic rocks near Chihuahua. Therefore rotations of Coahuila Island may be a Cenozoic attribute related to late Laramide deformation. Reconstructions of western equatorial Pangea should place the Coahuiltecano terrane at or near its present position with respect to North America.doi: https://doi.org/10.22201/igeof.00167169p.2005.44.2.254  

773.1.#.t: Geofísica Internacional; Vol. 44 Núm. 2: Abril 1, 2005; 197-2010

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: 197-2010

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

doi: https://doi.org/10.22201/igeof.00167169p.2005.44.2.254

handle: 3a9c6e0ede431243

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

856.#.0.q: application/pdf

file_creation_date: 2022-05-23 18:37:54.0

file_modification_date: 2022-05-23 18:37:54.0

file_creator: Molina Garza R.S.

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245.1.0.b: Paleomagnetic reconstruction of Coahuila, Mexico: The Late Triassic Acatita intrusives

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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