ISSN: 2310-2799
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546,196 artículos
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Año:
2019
ISSN:
2007-2902, 1026-8774
Jacques-Ayala, César
Universidad Nacional Autónoma de México
Resumen
The lower Cretaceous Cintura Formation is described and defined as a stratigraphic unit for northwestern Sonora, Mexico. The reference sections are in the Sierra El Chanate, located about 20 km northeast of Caborca… in order to continue, download the full paper in PDF.
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Año:
2019
ISSN:
2007-2902, 1026-8774
Lugo-Hubp, José; Aceves-Quesada, José Fernando; Espinosa-Pereña, Ramón
Universidad Nacional Autónoma de México
Resumen
The detailed analysis of 165 topographical maps at scale of 1:50,000, which cover the Yucatán Peninsula, allowed the elaboration of the following six maps, at a very small scale: 1 morphoisohypsas, 2 maximum heights, 3 relief amplitude, 4 general geomorphology, 5 Karst landforms, and 6 lineaments… in order to continue, download the full paper in PDF.
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Año:
2019
ISSN:
2007-2902, 1026-8774
Delgado-Argote, Luis Alberto
Universidad Nacional Autónoma de México
Resumen
The area comprised between Cuicatlán and Concepción Pápalo, Oaxaca, belongs to the Tehuantepec-Tehuacán or Cuicateco paleobasin. It is constituted by unmetamorphosed sedimentary rocks of Cenozoic age and Mesozoic rocks which include metamorphosed volcanic flows, metapyroclastics andinterbedded metasediments. A large block of serpentinites is tectonically emplaced into the Mesozoic sequence which is defined by flow planes.
Related to the Late Cretaceous compressive tectonics, the whole area experimented a general deformation, where the resulting structures verge eastward. The region lies on the western limb of a broad anticline, the former having an attitude of N10°E/34°W. Download full text.
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Año:
2019
ISSN:
2007-2902, 1026-8774
Delgado-Argote, Luis Alberto; Carballido-Sánchez, Enrique Alberto
Universidad Nacional Autónoma de México
Resumen
The structurally complex geometry of southeastern Mexico can be partially explained by stability analysis of the region of convergence between the North America, Caribbean and Cocos plates. A trench-trench-transform fault triple junction is located south-southeast of Salina Cruz. It is unstable and migrates eastward since about 8 Ma, from Puerto Ángel, along the Polochic system. The geometric solution and evolution of the triple junction of the Gulf of Tehuantepec explains major tectonic features such as: (a) a gravimetrically defined basin, between Puerto Ángel and Salina Cruz; (b) a left-handed transpressive system, 100 km wide and SW-NE oriented, which runs from Puerto Ángel to Macuspana; and (c) a probably active clockwise rotative block located between the Puerto Ángel Macuspana and Polochic-Motagua transcurrent systems. The northern limits of this block are not well-defined… In order to continue, download the full text in PDF.
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Año:
2019
ISSN:
2007-2902, 1026-8774
Córdoba-Méndez, Diego A.
Universidad Nacional Autónoma de México
Resumen
A sequence of volcanic rocks over 1,800 m thick, unconformably lies over Upper Cretaceous sediments or lower Tertiary molasse, between Sierra de Gamón and Laguna de Santiaguillo.
The basal portion of the sequence consists of andesitic flows of late Eocene-early Oligocene age, unconformably covered by ignimbrites and tuffs, erupted during successive explosive events of the Chupaderos and Río Chico calderas. The section was divided into six lithostratigraphic units that rango in age (K-Ar) from 31.8 to 28.6 Ma and is covered in turn by the Sierra de Gamón rhyolites.
Associated to the basin-and-range faulting (12 Ma), alkaline basaltic dikes fed the Metates Formation that covered the stratigraphic section. Reactivation of faulting was accompanied by the extrusión of Quaternary basalts. These rocks are interfingered or covered by talus, lake deposits or Recent alluvium.
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Año:
2019
ISSN:
2007-2902, 1026-8774
Carillo-Martínez, Miguel
Universidad Nacional Autónoma de México
Resumen
On presente ici une étude quantitative de la géometrie structurale Laramienne de la section qui se trouve entre Peñamiller et Jalpan, Etat de Querétaro, traversant la Sierra de Pinal ou Sierra Gorda, secteur dans lequel toute la séquence mésozoïque affleurante montre des plis et chevauchement de directions axiaux parallèles, alors qu'à l'ouest de Peñamiller, les roches jurassiques de la Formation San Juan de la Rosa ont été préalablement plissés par une phase fini-jurassique ou nevadienne.
La section structurale étudiée embrasse les limits septentrionaux du bassin de Zimapán, limité au sudouest par le banc El Doctor et au nord et à l'est par la plateforme de Valles-San Luis Potosí… In order to continue, download the full text in PDF.
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Año:
2019
ISSN:
2007-2902, 1026-8774
Silva-Pineda, Alicia
Universidad Nacional Autónoma de México
Resumen
A Little Late Jurassic (Kimeridgiano-Titoniano) flora was collected and sdudies for the first time in the sections “Arroyo El Platáno” and “El Edén”, located in the southern part the State of Veraruz… in order to continue, download the full paper in PDF.
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Año:
2019
ISSN:
2007-2902, 1026-8774
Rodríguez-Castañeda, José Luis
Universidad Nacional Autónoma de México
Resumen
The rocks in the Tuape region, north-central Sonora, are intensely faulted and fractured and occasionally folded. Thrust and normal are the commonest fault types and folds are of chevron type. These structures were produced during at least three periods of deformation: Late Jurassic, Late Cretaceous-early Tertiary, and middle to late Tertiary. The first is characterized by intense low-angle faulting and slight metamorphism; the second consists of thrust faulting (?) and emplacement of plutons; the third is typified by basin-and-range normal faulting which generated the present morphological expression of the study area.
It is speculated that the complex pattern of tectonic disruption is partially related to the transition from convergence to transcurrent faulting and attendant transpression along the Mojave-Sonora megashear… In order to continue, download the full text in PDF.
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Año:
2019
ISSN:
2007-2902, 1026-8774
de Cserna, Zoltan
Universidad Nacional Autónoma de México
Resumen
The evolution of the geology as a natural science in Mexico and its bearing upon the different utilitarian activities in the country during almost four centuries, may be analysed in two major arbitrarily established periods; one before and the other after Charles Lyell.
Information from the epoch of tbe Conquest tends to indicate that the native inhabitants did not cultiva te the geology (sensu lato) and that the recently arrived Spaniards, although were successful in discovering important mineral deposits, they succeeded through empirical prospecting. European travelers and naturalists, on the basis of their observations and experiences in the New World, described minerals, fossils, earthquakes and volcanoes, and one of them even proposed the hypothesis regarding the former connection of Europe, Asia, Africa and America -several centuries before one would speak about Pangea, continental drift and plate tectonics… In order to continue, download the full text in PDF.
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Año:
2019
ISSN:
2007-2902, 1026-8774
Lugo-Hubp, José
Universidad Nacional Autónoma de México
Resumen
The topography of the Mexican Republic (that of the continent and· that of the ocean bottom of the exclusive economic zone) is represented in a very small scale (1:12'000,000) which permits the recognition of the major structural landforms: block-type, volcanic, and folded mountain systems; high platea u surfaces with diverse geologic and morphological characteristics; platform plains; intermontane depressions; and border plains of the mountain systems. The topography of the ocean bottom is extraordinarily diverse and complex; in it, the shelf and continental slope, continental rise, trenches, ridges, mid-oceanic ridges and rift depressions, abyssa1 plains of marine and oceanic basins, fracture zones, and sea-mounts are recognized. This complex of structural forms is the expression of the youthness of Mexican topography and of its intense present dynamics… In order to continue, download the full text in PDF.
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