Scanning electron microscopy analysis of quartz grains in desert and coastal dune sands (Altar Desert, NW Mexico)

Scanning electron microscopy analysis of quartz grains in desert and coastal dune sands (Altar Desert, NW Mexico)

A scanning electron microscopy analysis was performed for 570 quartz grains from desert and coastal dune sands in NW Mexico. Our main goal is to present a new application in the use of ternary diagrams with logistic normal confidence region boundaries of normalized data based on quartz surface textu...

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Autores principales: Kasper-Zubillaga, JJ, Faustinos-Morales, R
Formato: Online
Lenguaje:eng
Publicado: Iniversidad Autónoma de Baja California 2007
Acceso en línea:https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/640
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id oai:cienciasmarinas.com.mx:article-640
record_format ojs
institution Ciencias Marinas
collection OJS
language eng
format Online
author Kasper-Zubillaga, JJ
Faustinos-Morales, R
spellingShingle Kasper-Zubillaga, JJ
Faustinos-Morales, R
Scanning electron microscopy analysis of quartz grains in desert and coastal dune sands (Altar Desert, NW Mexico)
author_facet Kasper-Zubillaga, JJ
Faustinos-Morales, R
author_sort Kasper-Zubillaga, JJ
title Scanning electron microscopy analysis of quartz grains in desert and coastal dune sands (Altar Desert, NW Mexico)
title_short Scanning electron microscopy analysis of quartz grains in desert and coastal dune sands (Altar Desert, NW Mexico)
title_full Scanning electron microscopy analysis of quartz grains in desert and coastal dune sands (Altar Desert, NW Mexico)
title_fullStr Scanning electron microscopy analysis of quartz grains in desert and coastal dune sands (Altar Desert, NW Mexico)
title_full_unstemmed Scanning electron microscopy analysis of quartz grains in desert and coastal dune sands (Altar Desert, NW Mexico)
title_sort scanning electron microscopy analysis of quartz grains in desert and coastal dune sands (altar desert, nw mexico)
description A scanning electron microscopy analysis was performed for 570 quartz grains from desert and coastal dune sands in NW Mexico. Our main goal is to present a new application in the use of ternary diagrams with logistic normal confidence region boundaries of normalized data based on quartz surface textures (i.e., constrained data) of desert and coastal dune sands. This was done to demonstrate that quartz surface textures from desert and coastal dune sands are not significantly different even though there are apparent dominant processes (mechanical, chemical) that produce different surface textures in quartz grains from both dune types. This may be associated with the fact that quartz grains deposited in the dune sands do not reflect a second cycle of transport associated with an aeolian environment because of their low textural maturity, provenance, closeness to the source rock, and little attrition process. This study indicates that quartz grains from the desert dunes display mechanical textures probably associated with the Colorado River Delta and granitic sources that do not reflect accurately the aeolian mechanisms controlling the transport of these grains. Also, some quartz grains display chemical surface textures probably linked to the hydrothermal activity near the Colorado River Delta. In general, quartz grains display conspicuous surface textures. Quartz from coastal dune sands displays chemical surface textures that indicate quartz precipitation from silica-saturated water and, to a lesser extent, it displays mechanical features. These similarities might be associated with the mixing of processes (mechanical, chemical ) in quartz from the desert and coastal dune sands.
publisher Iniversidad Autónoma de Baja California
publishDate 2007
url https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/640
_version_ 1715723993182371840
spelling oai:cienciasmarinas.com.mx:article-6402019-04-03T17:14:49Z Scanning electron microscopy analysis of quartz grains in desert and coastal dune sands (Altar Desert, NW Mexico) Análisis por microscopía electrónica de barrido de granos de cuarzo de dunas desérticas y costeras(Desierto de Altar, NW México) Kasper-Zubillaga, JJ Faustinos-Morales, R desert and coastal dune sands quartz surface textures scanning electron microscopy (SEM) logistic normal confidence region boundaries (LNCRB) factor analysis dunas desérticas y costeras rasgos superficiales del cuarzo microscopio electrónico de barrido límites logísticos de confianza análisis factorial A scanning electron microscopy analysis was performed for 570 quartz grains from desert and coastal dune sands in NW Mexico. Our main goal is to present a new application in the use of ternary diagrams with logistic normal confidence region boundaries of normalized data based on quartz surface textures (i.e., constrained data) of desert and coastal dune sands. This was done to demonstrate that quartz surface textures from desert and coastal dune sands are not significantly different even though there are apparent dominant processes (mechanical, chemical) that produce different surface textures in quartz grains from both dune types. This may be associated with the fact that quartz grains deposited in the dune sands do not reflect a second cycle of transport associated with an aeolian environment because of their low textural maturity, provenance, closeness to the source rock, and little attrition process. This study indicates that quartz grains from the desert dunes display mechanical textures probably associated with the Colorado River Delta and granitic sources that do not reflect accurately the aeolian mechanisms controlling the transport of these grains. Also, some quartz grains display chemical surface textures probably linked to the hydrothermal activity near the Colorado River Delta. In general, quartz grains display conspicuous surface textures. Quartz from coastal dune sands displays chemical surface textures that indicate quartz precipitation from silica-saturated water and, to a lesser extent, it displays mechanical features. These similarities might be associated with the mixing of processes (mechanical, chemical ) in quartz from the desert and coastal dune sands. Un análisis en el microscopio electrónico de barrido se realizó a 570 granos de cuarzo de dunas desérticas y costeras en el noroeste de México. Nuestro objetivo principal es el de presentar una nueva aplicación en el uso de diagramas ternarios con límites logísticos de confianza en datos normalizados basados en rasgos superficiales del cuarzo (datos cerrados). Esto se realizó para demostrar que los rasgos superficiales del cuarzo de dunas desérticas y costeras no son significativamente diferentes a pesar de que hay ciertos procesos dominantes (mecánicos, químicos) que producen estos rasgos superficiales en el cuarzo de ambos tipos de dunas. Esto puede asociarse con el hecho de que el cuarzo depositado en las dunas no refleja un segundo ciclo de transporte asociado a un ambiente eólico debido a su baja madurez textural, procedencia, cercanía a la roca fuente y poco desgaste superficial del grano. Este estudio indica que los granos de cuarzo de las dunas desérticas muestran rasgos asociados al Delta del Río Colorado y fuentes graníticas que no reflejan de manera precisa los mecanismos eólicos que controlan el transporte de estos granos. Asimismo, algunos granos de cuarzo muestran rasgos superficiales de origen químico posiblemente vinculados a la actividad hidrotermal cerca del Delta del Río Colorado. En general, los granos de cuarzo muestran rasgos superficiales bien definidos. El cuarzo de las dunas costeras muestra rasgos superficiales químicos que indican precipitación de agua sobresaturada en sílice y, en menor grado, muestra rasgos superficiales de origen mecánico. Estas similitudes están asociadas a la mezcla de procesos (mecánicos, químicos) en cuarzo de dunas desérticas y costeras. Iniversidad Autónoma de Baja California 2007-03-07 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article Artículo Arbitrado application/pdf https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/640 10.7773/cm.v33i1.640 Ciencias Marinas; Vol. 33 No. 1 (2007); 11-22 Ciencias Marinas; Vol. 33 Núm. 1 (2007); 11-22 2395-9053 0185-3880 eng https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/640/1883

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