ISSN: 2310-2799
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546,196 artículos
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Año:
2019
ISSN:
2007-2902, 1026-8774
Ortega-Gutiérrez, Fernando
Universidad Nacional Autónoma de México
Resumen
On the basis of a geological reconnaissance of the crystalline rocks exposed in the Mixteca región of the states of Puebla and northwestern Oaxaca, the stratigraphic rank of the Acatlan Formation is rised to groupand named Acatlan Complex… In order to continue, download the full paper in PDF.
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Año:
2019
ISSN:
2007-2902, 1026-8774
Fabregat-Guinchard, Francisco José
Universidad Nacional Autónoma de México
Resumen
Le programme fait référence a la détérmination d'une ou de plusières composantes d'agrégat de substances a partir de son diagramme de poudres obténu par diffraction des Rayos X.
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Año:
2019
ISSN:
2007-2902, 1026-8774
Alencáster, Gloria
Universidad Nacional Autónoma de México
Resumen
Astacodes sp. cf. A. maxwelli Stenzel, a decapod crustacean similar to the living lobster, is described from the San Lucas Formation (Hauterivian-Aptian) of north-central Guerrero.
A brief review is included on the scarce fossil crustacean publications of Mexico, exclusive of the ostracods.
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Año:
2019
ISSN:
2007-2902, 1026-8774
Franco-Rubio, Miguel
Universidad Nacional Autónoma de México
Resumen
In Naica region, in the south-central part of Chihuahua State, Cretaceous sedimentary rocks crop out, mainly limestones that contain metallic sulphides (lead, zinc and silver) of economic importance… In order to continue, download the full paper in PDF.
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Año:
2019
ISSN:
2007-2902, 1026-8774
de Cserna, Zoltan; Delevaux, Maryse H.; Harris, Donald C.
Universidad Nacional Autónoma de México
Resumen
In the Fresnillo mining district in central Zacatecas State, the lead-zinc-silver deposits are in the form of mantos, ore chimney and veins. The geologic information, available mainly from the Fresnillo mine, indicates that the mantos are within Lower Cretaceous marine clastic sedimentary rocks, which were folded together during the early Eocene. One of the mantos, together with the under- and overlying sedimentary rocks, was intruded by a small vertical quartz monzonite stock, probably toward the end of the Eocene. Along the south margin of this intrusive, there is an ore chimney that extends about 50 m below and about 50 m above the general level of the intruded manto. Of the numerous veins of the Fresnillo mine, one of them crosscuts the intrusive, whereas several others cut the folded mantos, but none of these cut the overlying rhyolitic rocks which are considered to be Miocene in age.
Isotope analyses of lead from the manto and vein ores indicate an almost identical composition and the leads are of the J-type... In order to continue, download the full paper in PDF.
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Año:
2019
ISSN:
2007-2902, 1026-8774
Palacios-Mayorga, Sergio; Mier-Herrera, Laura Beatriz
Universidad Nacional Autónoma de México
Resumen
The purpose of the present study was to evaluate the residual effect of herbicide “Gesaprim 50” on the populations of bacteria, actinomycetes and on the microorganisms involvend in the carbón, sulphur and nitrogen cycles… In order to continue, download the full paper in PDF.
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Año:
2019
ISSN:
2007-2902, 1026-8774
de Cserna, Zoltan; Palacios-Nieto, Miguel; Pantoja-Alor, Jerjes
Universidad Nacional Autónoma de México
Resumen
In the northwestern Guerrero and adjacent ports of Mexico and Michoacán, it is observed that the upper Aptian-lower Albian anhydrites and gypsum, that outcrop near Apipilulco, are replaced in the vicinity of Chilacachapa by calcareous shales and farther west, near Huetamo, by shales and tuffaceous shales… In order to continue, download the full paper in PDF.
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Año:
2019
ISSN:
2007-2902, 1026-8774
Villegas-Soto, Mariano; Aguilera-Herrera, Nicolás; Flores-Delgadillo, Lourdes
Universidad Nacional Autónoma de México
Resumen
Differences among somo well-known techniques of analysis were compared, utilizing soils from different parts of Mexico, to achieve a simple method for grouping mineral particles… In order to continue, download the full paper in PDF.
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Año:
2019
ISSN:
2007-2902, 1026-8774
Pantoja-Alor, Jerjes
Universidad Nacional Autónoma de México
Resumen
Study of quartz sands of the Corralitos region of Chihuahua State, comprises Santa Rosa-Ampliación Santa Rosa, Lolis-Materola, Uribe, San Juan, Cerro Blanco and Rancho Blanco-Maravillas area. The quartz of the sand deposits of Maravillas formation (Miocene-Pliocene) is the erosion product of old tuffs and other volcaniclastic rocks. The Maravillas formation is of fluvial-lacustrine origin and during its accumulation explosive volcanic activity prevrailed. At the end and after the eruptive period the region experienced intense hydrotermal activity that altered part of the Maravillas formation and part of the volcanic rocks.
The quartz grains vary from rounded to well rounded and the sphericity is considerably high. The quartz is high temperature and it probably originated in the rhyolitic tuffs Its corrosion is due to the action of alkaline ground waters coupled with eolian processes... In order to continue, download the full paper in PDF.
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Año:
2019
ISSN:
2007-2902, 1026-8774
de Cserna, Zoltan; Armstrong, Richard L.; Yáñez-García, Camilo; Solório-Munguía, José
Universidad Nacional Autónoma de México
Resumen
In the valley of Camalotito River at El Zapotillo, northeast of Petatlan in southwestern Guerrero State, a more tan 350 m thick metavolcanic sequence crops out… In order to continue, download the full paper in PDF.
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