993 resultados para Placer deposits


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Interior layered deposits within an embayment in the northern as well as near the southern wall of Coprates Chasma in the Valles Marineris, Mars are studied using HRSC, CTX, HiRISE and CRISM data. In the northern embayment, layered deposits outcrop in three separate locations (a western deposit, a central deposit and an eastern deposit). The central layered deposit in the north has a stratigraphic thickness of 2 km. The western layered deposit abuts against the chasma wall appearing to have a relatively un-eroded depositional surface. The eastern deposit is near a landslide scar which appears to have exposed basement layering showing downward displacement. This northern embayment is suggested to have been an ancestral basin. The triangular edged deposit near the southern wall of Coprates Chasma has an elongated mound protruding from the central edge and is suggested to be the outer limits of a fault block which is back rotated 6° south. The rotation may be the result of the Valles Marineris opening.

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On Mars, interior layered deposits (ILD) provide evidence that water was once stable at the surface of the planet and present in large quantities. In West Candor Chasma, the ILD and their associated landforms record the depositional history of the chasma, and the deformation of those deposits provide insight into the stresses acting on them and the chasma as a whole. The post ILD structural history of West Candor is interpreted by analyzing the spatial relationships and orientation trends of structural features within the ILD. Therecording of stresses through brittle deformation of ILDs implies that the ILD had been lithified before the stress was imposed. Based on the prominent orientation trends of deformation features, the orientation of the stress regime acting upon the ILD appears to be linked to the regime that initially created the chasma-forming faults. An additional minor stress orientation was also revealed and may be related to large structures outside west Candor Chasma. The late depositional history of Ceti Mensa is herein investigated by examining the attributes and spatial relationship between unique corrugated, linear formations (CLF). The CLFs appear to be aeolian in origin but display clear indications of brittle deformation, indicating they have been Iithified. Evidence of lithification and the mineral composition of the surrounding material support the interpretation of circulating water in the area.

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UANL

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The present work deals with the texture, mineralogy and geochemistry of bedload sediments of the main stream of the Chaliyar basin, a typical small drainage system of the tropics enjoying heavy rain fall and moderate climate, located essentially in the Northern Kerala and flowing over the crystalline rocks (and their laterized duricrust) of the South Indian granulite terrain. As the Chaliyar is the major river draining the Wynad Gold Fields and is known for its placer gold occurrences, the thesis gives special emphasize on understanding the nature and distribution of detrital gold in sediments of the basin, while attempting to infer the provenance characteristics and factors involved in the evolution of sediments in general. Minerologically the chaliyar basin sands are quartzose. The quartz and feldspar contents in the coarse sand fraction of the basin range from 64 to 86% and 2 to 16% respectively. The Q/F ration ranges from 4 to 38 with a slight decrease in the lower reaches. Other minerals present include, hornblende, pyroxene and heavy minerals like opaques, garnet, rutile, biotite, spene, silliminite, zircon, apatite and monazite some of which are seen as inclusions in quartz. The major element composition of Chaliyar bedload sediments in the main channel and the headwater tributaries is related to the mineralogical and textual characteristics of sediments.

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In the present thesis the petrographic, geochemical and digenetic variability of the sediments in the islands of Kavaratti and Minicoy has been investigated .The beach profile studies show that in the Kavaratti lagoon beach, the slope is steeper in the southern and south central part than in the northern end’s marginal deposition is taking place in the northern end of the Kavaratti island, whereas a marginal erosion is observed at the southern end. In Minicoy the slope of the lagoon beach is gentle in the south and is slightly steeper at the northern part of the beach. The southern and northern beach sections show a marginal deposition. Based on the mineralogical and geochemical studies it is concluded that the main digenetic changes observed is the transformation of aragonite to LMC.The transformation takes place mainly in the vadose zone and is caused by the abundance of fresh water infiltration.

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A study of tin deposits from Priamurye (Russia) is performed to analyze the differences between them based on their origin and also on commercial criteria. A particular analysis based on their vertical zonality is also given for samples from Solnechnoe deposit. All the statistical analysis are made on the subcomposition formed by seven trace elements in cassiterite (In, Sc, Be, W, Nb, Ti and V) using the Aitchison’ methodology of analysis of compositional data

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Este documento explora la relación que existe entre la interseccionalidad y las relaciones de género y clase social en razón de prácticas sexuales tales como la infidelidad, sexo casual, uso de lencería, ataduras e inmovilizaciones, piropos, sexo oral, orgías y encuentros con prostitutas en Bogotá, Colombia.

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Resumen tomado del autor

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Se afirma que la realidad es la primera lectura del individuo, por lo que el espectáculo visual actual produce un descenso en la lectura. No se ha sabido democratizar la lectura, a juicio del autor, para que fuera un bien compartido por todos. La modernidad imperante en la comunicación audivisual actual ejerce un efecto en la obra literaria y en el lector, en la experiencia lectora y en la capacidad de generar nuevas lecturas e incitar la imaginación. Se concluye que la contribución y el reto de la literatura hacia el futuro, participar en la construcción de la sociedad humana.

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Resumen tomado de la publicación

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Este ensayo se ocupa, fundamentalmente, de los conceptos de deseo, placer, voluntad, erotismo y seducción. Desde el principio, se pone en escena la pornografía como pretexto para pensar esos conceptos, teniendo claro que se trata de establecer sus relaciones, así como sus diferencias más radicales. Nuestra hipótesis es que el deseo nada tiene que ver con la satisfacción de las demandas. El deseo es un afecto mediante el cual se vincula la voluntad a los objetos de su interés, no un sentimiento producido por sus características particulares. En ese sentido es que intervienen los demás conceptos. El concepto de deseo puede ser caracterizado al tener en cuenta la experiencia interior del erotismo, al igual que el intercambio simbólico en la seducción. La investigación se divide en cuatro partes. La primera se ocupa de los conceptos de voluntad, deseo, ley. La segunda tiene que ver con la idea de que el deseo se vincula con una ambigüedad erótica siempre presente en la voluntad. La tercera parte, matiza los conceptos de deseo, erotismo y voluntad sobre la experiencia del seductor de Kierkegaard. Finalmente, volvemos al tema de la pornografía para remarcar la diferencia entre placer y deseo. Palabras clave: deseo, placer, voluntad, seducción, erotismo y pornografía.

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