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546,196 artículos
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Año:
2019
ISSN:
2007-2902, 1026-8774
Nelson, Stephen A.
Universidad Nacional Autónoma de México
Resumen
As evidenced by recent eruptions on Earth, volcanic hazards studies can aid scientists and government officials in reducing the danger of volcanic eruptions. Such studies require detailed geologic work in order to assess the areas that might be subject to various types of eruptive behavior from any given volcano. Although nine volcanoes in Mexico have erupted historically and many more have shown relatively recent eruptive activity, a volcanic hazards study is available for only one volcano. A review of the present knowledge of the geologic histories of recently active volcanoes in Mexico reveals that future eruptions are probable, repose times between eruptions of tens of thousands of years are common, and violent eruptions can affect areas at large distances from the volcanoes… In order to continue, download the full text in PDF.
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Año:
2019
ISSN:
2007-2902, 1026-8774
Vassallo, Luis Fernando; Olmos-Colunga, Javier; Villaseñor-Cabral, María Guadalupe; Girón-García, Patricia; Lozano-Cobo, Anastasio
Universidad Nacional Autónoma de México
Resumen
Wall rock alteration was studied from the Veta Madre lode in the central part of the Guanajuato mining district… In order to continue, download the full paper in PDF.
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Año:
2019
ISSN:
2007-2902, 1026-8774
González-Partida, Eduardo; Martínez-Serrano, Raymundo
Universidad Nacional Autónoma de México
Resumen
The copper orebody La Sorpresa is located southwest of Ameca, Jalisco. It is associated with a quartz monzonite intrusión of 54.3±4.9 Ma (K-Ar dating method), emplaced in an early Tertiary andesite… In order to continue, download the full paper in PDF.
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Año:
2019
ISSN:
2007-2902, 1026-8774
Carrillo-Martínez, Miguel
Universidad Nacional Autónoma de México
Resumen
L’article présenté est une synopsis de la géologie régionale de la Sierra Madre Orientale dans le centre-orient de l’État de Querétaro et des provinces voisines… Pour continuer, tèlècharger l`article complet en PDF.
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Año:
2019
ISSN:
2007-2902, 1026-8774
Carrasco-Núñez, Gerardo; Milán, Marcos; Verma, Surendra P.
Universidad Nacional Autónoma de México
Resumen
The Zamorano volcano is located in the north-central part of the Trans-Mexican Volcanic Belt, at almost 465 km from the Middle American Trench. It is an andesitic stratovolcano with a Miocene-Pliocene age… In order to continue, download the full paper in PDF.
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Año:
2019
ISSN:
2007-2902, 1026-8774
Silva-Mora, Luis
Universidad Nacional Autónoma de México
Resumen
The study area is located 90 km to the NNW of Mexico City, and has an approximate extension of 1,800 km2, making up the Tula de Allende and Polotitlán quadrangles (CETENAL, 1975a, b). The rocks that crop out in the region resulted from four volcanic episodes that are recognized in the State of Hidalgo… 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
Universidad Nacional Autónoma de México
Resumen
During the past decade, much discussion was focused on the minimum dip that a plane of weakness must have to be reactivated as a normal fault. In this study, the ranges of orientations (strike and dip) of the planes of weakness that will reactivate under different stress regimes and diverse crustal conditions, are calculated… in order to continue, download the full paper in PDF.
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Año:
2019
ISSN:
2007-2902, 1026-8774
Nieto-Samaniego, Ángel Francisco; Alaniz-Álvarez, Susana Alicia; Labarthe-Hernández, Guillermo
Universidad Nacional Autónoma de México
Resumen
The age and structural features of Cenozoic extensional deformation in the southern Mesa Central are very different from those of the surrounding provinces. In the Sierra Madre Oriental, the Cenozoic extensional deformation is imperceptible. In the Sierra Madre Occidental, the Cenozoic extensional deformation occurred in two main events… in order to continue, download the full paper in PDF
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Año:
2019
ISSN:
2007-2902, 1026-8774
Monreal-Saavedra, Rogelio
Universidad Nacional Autónoma de México
Resumen
The upper Aptian-middle Albian marine sequence exposed in the Cerro Las Conchas is clearly upside down, being the middle Albian rocks in the topographic base of the sequence, while the upper Aptian is in the upper part of the section. The microfacies analysis of this succession showed that the environments of deposition were variable, and represent sedimentation in a shallow sea varying from inner- to outer-neritic waterdepths… in order to continue, download the full paper in PDF.
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Año:
2019
ISSN:
2007-2902, 1026-8774
Montellano-Ballesteros, Marisol
Universidad Nacional Autónoma de México
Resumen
Recently, near the town of Teocaltiche, state of Jalisco, vertebrate remains were recovered from a sequence of sands and gravels. The recognized taxa are: hyaena-like dog Osteoborus cyonoides, antilocaprid cf. Hexobelomeryx fricki, equids Dinohippus? mexicanus and Astrohippus? stockii, and an indeterminate gomphothere… in order to continue, download the full paper in PDF.
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