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546,196 artículos
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Año:
2019
ISSN:
2007-2902, 1026-8774
Weber, Reinhard
Universidad Nacional Autónoma de México
Resumen
The Carnian (and/or Norian?) Santa Clara flora of central Sonora, Mexico, yields a high proportion of bennettitalcan leaves. In an earlier paper, Laurozamites Weber and Zamudio-Varela was already segregated from Zamites… in order to continue, download the full paper in PDF.
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Año:
2019
ISSN:
2007-2902, 1026-8774
Vassallo, Luis F.; Martínez-Reyes, Juventino; París, Jean Pierre
Universidad Nacional Autónoma de México
Resumen
The multispectral and panchromatic SPOT images of the southeastern Sierra de Guanajuato were used to relate the structural lineaments with the existence of ore deposits… in order to continue, download the full paper in PDF.
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Año:
2019
ISSN:
2007-2902, 1026-8774
Friedel, Jürgen K.
Universidad Nacional Autónoma de México
Resumen
Soil microbial biomass and activities are sensitive indicators of management effects. Higher contents of microbial biomass and higher activities, for example, are found with crop rotations in contrast to bare fallow and monoculture systems… in order to continue, download the full paper in PDF.
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Año:
2019
ISSN:
2007-2902, 1026-8774
Lugo-Hubp, José; Salinas-Montes, Araceli
Universidad Nacional Autónoma de México
Resumen
The sierra de Guadalupe is a volcanic neogenic, unit consisting of domes and strato-volcanoes, having a circular arrangement with a diameter of 17 km and a height of 800m above the surrounding lacustrine plain. The results of a geomorphological study are synthesized in three main maps: morphogenetics, morphotectonics and natural hazards… in order to continue, download the full paper in PDF.
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Año:
2019
ISSN:
2007-2902, 1026-8774
Flores-Román, David; Alcalá-Martínez, Jorge René; González-Velázquez, Arelia; Gama-Castro, Jorge Enrique
Universidad Nacional Autónoma de México
Resumen
The objectives of this work are: (1) to determine, by means of basic investigation, the main properties of the soils and the duripans in the study area; (2) to generate information about the genesis of both… in order to continue, download the full paper in PDF.
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Año:
2019
ISSN:
2007-2902, 1026-8774
Alencáster, Gloria; Aguilar-Pérez, Javier Aguilar
Universidad Nacional Autónoma de México
Resumen
A new caprinid rudist, Jalpania queretana, new genus and new species, is described from the reefal Taninul member of the mid-Cretaceous El Abra Formation, at “El Madroño”, located in the northeast of the State of Queretaro, in central Mexico… in order to continue, download the full paper in PDF.
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Año:
2019
ISSN:
2007-2902, 1026-8774
Monod, Olivier; Pérez-Segura, Efrén; Richard, Didier; Calmus, Thierry
Universidad Nacional Autónoma de México
Resumen
Orbicular granites are unusual rocks, and the presence of a large outcrop within the Mazatán metamorphic core complex, Sonora, Mexico, was unexpected. This is the second orbicular rock outcrop recognized in Mexico, after the San Pedro Mártir gabbro in Baja California. Sierra Mazatán is the southernmost metamorphic core complex in the northern Cordillera, which resulted of Mesozoic crustal thickening, followed by Tertiary extensional tectonics… in order to continue, download the full paper in PDF.
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Año:
2019
ISSN:
2007-2902, 1026-8774
Alaniz-Álvarez, Susana Alicia; Nieto-Samaniego, Ángel Francisco; Ortega-Gutiérrez, Fernando
Universidad Nacional Autónoma de México
Resumen
The western side of Sierra de Juárez, State of Oaxaca, Mexico, is characterized by a N-S trending structural complex more than 130 km long and 10 to 15 km wide, constituting a mylonitic belt that is the largest in Mexico. In the southern part of this belt, the mylonite protolith is formed by: (1) gneiss, granulite, anorthosite, and marble from the basement of the Zapoteco terrane (Oaxacan Complex); (2) leucocratic granitic rocks consisting in the mylonitized granite near San Pablo and San Pedro Etla, which is correlated with the Permian "Etla Granite", and the granite close to San Felipe del Agua, near the city of Oaxaca, which is considered syntectonic; (3) ultramafic basement units of the Cuicateco terrane, such as hornblendite and gabbro; (4) basic volcanic or subvolcanic rocks; and (5) sedimentary rocks of unknown origin... In order to continue, download full text in PDF.
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Año:
2019
ISSN:
2007-2902, 1026-8774
Buitrón-Sánchez, Blanca Estela; Carrillo-Martínez, Miguel; Rosales-Domínguez, María del Carmen; Aguilera-Franco, Noemí
Universidad Nacional Autónoma de México
Resumen
In the northeastern part of the State of Querétaro, central Mexico, Cretaceous carbonate rocks are extensively exposed… in order to continue, download the full paper in PDF.
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Año:
2019
ISSN:
2007-2902, 1026-8774
González-León, Carlos Manuel
Universidad Nacional Autónoma de México
Resumen
The Bisbee basin is considered to be the primary structural site of sedimentation of the Bisbee Group of Late Jurassic and Early Cretaceous age, in the region of southeastern Arizona and southwestern New Mexico in the U.S.A. and northeastern Sonora in Mexico. Recent studies, however, have confirmed the presence of correlative lithostratigraphic units of the Bisbee Group in several areas of northem and central Sonora, which indicate that the Bisbee basin extended southward of the previously defined boundaries.
Several stratigraphic sections, near the southwestern margin of the basin in Sonora, are discussed in this paper...In order to continue, download full text in PDF.
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