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546,196 artículos
Año:
2019
ISSN:
2007-2902, 1026-8774
Urrutia-Fucugauchi, Jaime; Hernández-Bernal, María del Sol; Lewis, Trevor; Milanovsky, Svet Yu.
Universidad Nacional Autónoma de México
Resumen
Determinations of uranium, thorium and potassium contents in five samples from three plutonic bodies (Río Grande, Río Verde and Jamiltepec) of the Río Verde batholith, Oaxaca continental margin, southern Mexico, are reported. These measurements have been obtained by two different methods, using: (1) passive gamma-ray spectroscopy with a Ge (Li) detector, and (2) Inductively Coupled Plasma Mass Spectrometer (ICP-MS)… in order to continue, download the full paper in PDF
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Año:
2019
ISSN:
2007-2902, 1026-8774
Pérez-Segura, Efrén; Cheilletz, Alain; Herrera-Urbina, Saúl; Hanes, Y. J.
Universidad Nacional Autónoma de México
Resumen
The San Francisco gold deposit is located 145 km north of Hermosillo, Sonora. Its geology includes a Precambrian metamorphic-igneous complex, a Jurassic meta-volcanosedimentary sequence and small bodies of Tertiary intrusions. The mineralization is hosted in a leucocratic deformed granite affected by Tertiary hydrothermal alteration… in order to continue, download the full paper in PDF.
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Año:
2019
ISSN:
2007-2902, 1026-8774
Velasco-Hernández, Mauro; Lucero-Arellano, Mario R.
Universidad Nacional Autónoma de México
Resumen
Al SSE de la ciudad de Tehuacán aflora una secuencia clástica de arenisca, lutita, limolita y lentes de conglomerado, cuyo contenido fósil (Pecopteris sp.,Sphenophyllum [?] y Sigillaria sp.) permite asignarle una edad paleozoica. La asociación tan peculiar de la flora presente y la composición litológica de la secuencia analizada, hacen suponer que esta última corresponda a la continuación de la Formación Matzitzi hacia el SE de su localidad tipo (Cerro Matzitzi)… in order to continue, download the full article in PDF.
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Año:
2019
ISSN:
2007-2902, 1026-8774
Nieto-Samaniego, Ángel Francisco; Macías-Romo, Consuelo; Alaniz-Álvarez, Susana Alicia
Universidad Nacional Autónoma de México
Resumen
Se ha realizado un gran esfuerzo con el fin de establecer la estratigrafía de la cubierta volcánica cenozoica que aflora en la parte meridional de la Mesa Central (J.M. Pérez-Ibargüengoitia, 1967; R. Pérez-lbargüengoitia, 1968; EchegoyénSánchez et al., 1970; Tristán-González, 1977; LabartheHernández y Tristán-González, 1980a, 1980b; Labarthe-Hernández et al., 1982; Aguillón-Robles, 1983; Labarthe-Hernández et al., 1983; Labarthe-Hernández y Aguillón-Robles, 1985, 1986, 1987… Para continuar, descargue el artículo completo en PDF
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Año:
2019
ISSN:
2007-2902, 1026-8774
Jahn, Reinhold; Stahr, Karl
Universidad Nacional Autónoma de México
Resumen
Soils in six landscapes of different ages ranging from Miocene/Pliocene to the historic eruptions 260 years ago in Lanzarote (Canary Islands, Spain) have been mapped and analyzed. With additional information about the more humid parts of the islands, a soil-type stability diagram is shown which differentiates the humidity and the age of the landscape… in order to continue, download the full paper in PDF.
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Año:
2019
ISSN:
2007-2902, 1026-8774
Gómez-Luna, María Eugenia; Martínez-Cortés, Ángel
Universidad Nacional Autónoma de México
Resumen
The Antimonio Formation exposed in the Sierra del Álamo, northwestern Sonora, consists of an Upper Permian-Lower Jurassic marine succession of sedimentary rocks that disconformably overlies the Guadalupian-age Monos Formation… in order to continue, download the full paper in PDF.
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Año:
2019
ISSN:
2007-2902, 1026-8774
Sandy, Michael R.
Universidad Nacional Autónoma de México
Resumen
Recent work on the taxonomy and paleobiogeographic affinities of Mesozoic brachiopods from Mexico is reviewed. Brachiopods are lesser components of Mesozoic marine fossil assemblages from Mexico but are abundant at certain horizons… in order to continue, download the full paper in PDF.
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Año:
2019
ISSN:
2007-2902, 1026-8774
Lucas, Spencer G.; González-León, Carlos Manuel
Universidad Nacional Autónoma de México
Resumen
Archidiskodon sonoriensis Osborn, 1929, the Arizpe mammoth, is a junior subjective synonym of Mammuthus imperator(Leidy,1858). The Arizpe mammoth was a complete skeleton found in 1929 from a locality about 1.6 km east of the town of Arizpe, Sonora, in Rancho El Basimachi… 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
Palygorskite occurs in the Yucatán peninsula as palygorskite-rich mudstone in middle Eocene Chichén-Itzá formation to Oligocene. Its lower limit of deposition is the lower Eocene Pisté formation or the Xbacal member of the middle Eocene Chichén-Itzá formation… in order to continue, download the full paper in PDF.
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Año:
2019
ISSN:
2007-2902, 1026-8774
Bigioggero, Biagio; Corona-Chávez, Pedro; Tunesi, Annalisa
Universidad Nacional Autónoma de México
Resumen
A Miocene volcanic succession, here called Miocene Andesitic Belt (cinturón andesítico miocénico, CAM), has an exposed thickness of 1,200 m in the Loreto-Las Parras region (Baja California Sur), along the eastern slope of the Sierra La Giganta… in order to continue, download the full paper in PDF.
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