ISSN: 2310-2799
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546,196 artículos
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Año:
2019
ISSN:
2007-2902, 1026-8774
Montellano-Ballesteros, Marisol; Carranza-Castañeda, Oscar
Universidad Nacional Autónoma de México
Resumen
In the lacustrine sediments of the area Rancho Viejo en San Miguel de Allende, Guanajuato, fossil remains were collected of a Mylodontidae whit morphologic modifications different from those forma described for North America, which allowed us to determine it as a new species… In order to continue, download the full paper in PDF.
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Año:
2019
ISSN:
2007-2902, 1026-8774
Aranda-Gómez, José Jorge; Pérez-Venzor, Antonio
Universidad Nacional Autónoma de México
Resumen
The studied area is 20 km to the NNW of La Paz, Baja California Sur. The Cretaceous (?) basement crops-out in the southeastern portion of the Isla Espíritu Santo. The crystalline rocks are augen gneissed of granitic composition… In order to continue, download the full paper in PDF.
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Año:
2019
ISSN:
2007-2902, 1026-8774
Roldán-Quintana, Jaime
Universidad Nacional Autónoma de México
Resumen
In northern Sonora two belts of Precambrian rocks are exposed, the youngest rocks are towards the east (l,600-1,700 m. y.), in northwestern Sonora the older rocks are exposed (1,700-1,800 m.y.). The main lithologies are schists, quartzites, gneisses and calcalkaline intrusives. These rocks have suffered a complex history of deformation, metamorphism and intrusion. These metamorphic rocks were unconformably covered by marine sedimentary carbonates at the end of the Precambrian. Cambrian rocks are concordant with the sedimentary Precambrian rocks. The more common lithologies among the Paleozoic rocks are limestones, sandstones and shales. The outcrops of the Paleozoic rocks are isolated in northern and central Sonora. The prevailing structural direction of the Paleozoic rocks is NW to NS. In the Mesozoic, during Late Triasstc thick sequences of clastics with coal lenses were deposited, they unconformably rest on Paleozoic rocks. In order to continue, download the full paper in PDF.
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Año:
2019
ISSN:
2007-2902, 1026-8774
Applegate, Shelton P.
Universidad Nacional Autónoma de México
Resumen
A new stratigraphic unit, the El Cien Formation, is proposed for the beds surrounding and to the east of El Cien, Baja California Sur… In order to continue, download the full paper in PDF.
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Año:
2019
ISSN:
2007-2902, 1026-8774
González-León, Carlos
Universidad Nacional Autónoma de México
Resumen
A 1,2003 m-thick Paleozoic carbonate sedimentary sequence, ranging in age from Cambrian to Permian, crop out at several scattered hills of Sierra del Tule área, about 40 km north of Cananea, in northeastern Sonora… In order to continue, download the full paper in PDF.
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Año:
2019
ISSN:
2007-2902, 1026-8774
de Pablo-Galán, Liberto
Universidad Nacional Autónoma de México
Resumen
Kaolinite and metakaolinite are soluble in acid environments at pH’s between 0 and 2.3, temperaturas of 100, 150 and 180º C, equilibrium pressure and reaction times from 3 to 48 h… In order to continue, download the full paper in PDF.
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Año:
2019
ISSN:
2007-2902, 1026-8774
Quintero-Legorreta, Odranoel; Aranda-García, Mario
Universidad Nacional Autónoma de México
Resumen
Between the salients of the transversal part of the Sierra Madre Oriental, which are the Parras and Arteaga antoclinoria, lays the Agua Nueva reces, located to the S-SW of Saltillo, Coahuila… In order to continue, download the full paper in PDF.
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Año:
2019
ISSN:
2007-2902, 1026-8774
Mora, Claudia I.; Valley, John W.; Ortega-Gutiérrez, Fernando
Universidad Nacional Autónoma de México
Resumen
The temperatura, pressure and fluid conditions at peak of granulite facies metamorphism have been determined for charnockites, marbles and quartzofeldspathic gneises in the Grenville-age Oaxaca Complex, southern Mexico… In order to continue, download the full paper in PDF.
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Año:
2019
ISSN:
2007-2902, 1026-8774
y Sánchez, Ricardo José Padilla
Universidad Nacional Autónoma de México
Resumen
The Sierra Madre Oriental between Saltillo, Monterrey, Linares and Concepción del Oro shows a bed in structures that strike from approximately N35ºE to about N35ºW. Most of the rocks involved in the Curvature of Monterrey are Mesozoic in age and range from Late Triassic to Late Cretaceous… In order to continue, download the full paper in PDF.
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Año:
2019
ISSN:
2007-2902, 1026-8774
Celis-Gutiérrez, Socorro
Universidad Nacional Autónoma de México
Resumen
Entre Punta Chueca et Punta Onah, le long de còte de Sonora, on observe des dépôts quaternaires marins dont la puissance ne dépasse pas 9 m… Pour continuer télécharger l'article complet en PDF.
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