%0 Journal Article
%T Estudio al M.E.B.de las texturas superficiales de los granos de cuarzo y su aplicaci車n a la interpretaci車n de medios actuales y subactuales
%A Torcal S芍inz
%A L.
%A Zazo Cardeˋa
%A C.
%A Marfil P谷rez
%A R.
%J Estudios Geologicos
%D 1984
%I Consejo Superior de Investigaciones Cient赤ficas
%X A spectrum of representative quartz grains of different sedimentary environments (beach, aeolian, fluvial), from recent, Quaternary and Pliocene ages has been examined under a Scanning Electron Microscope. The environment of deposition of the fossil sequences was previously established by other sedimentological techniques, The purpose of the present investigation is to establish the degree of validity of "Surface textural Analysis of Quartz" to several different sedimentary environmeats distinguished on the basis of their surface textures. The Plio-Quaternary "Arenas Rojas" Formation from the Vejer-Medina area, which is of controversial origin has also been studied. The purpose here is to contribute to a better understanding of its sedimentary environment. The following analysis has been made as a complement to our S.E.M. study: The grain-size distribution of all examined samples was studied with binocular and petrographic microscopes. A diagnostic surface feature glossary is described in this paper for the purpose of comparing terminologies. This information is necessary because of the confusion that exists in literature. Within the littoral beach-aeolian environment, recent "Valdelagrana" and in the fossil "El Aculadero" (both in the Bah赤a de C芍diz), satisfactory results have been obtained in relation to other sedimentological data; other superimposed features related to diagenetic and edaphic processes are also be noted. The sequence of different environments has been studied within the "Arenas Rojas" Formation. Our data do not contradict the prevailing literature, but we used quantitative combined feature analysis on a large number of samples to study minor deviations from published analyses. Se han estudiado muestras representativas de distintos ambientes sedimentarios (marino, e車lico, fluvial), tanto en medios actuales como en subactuales y f車siles (Plio-Cuaternarios y Cuaternarios) conocidos previamente mediante otros m谷todos, con el fin de establecer el grado de validez de la Exoscopia del cuarzo para la interpretaci車n de ambientes sedimentarios. Asimismo, se ha estudiado la "Formaci車n Arenas Rojas" de la zona Vejer-Medina, de origen problem芍tico, para contribuir con la utilizaci車n de esta 't谷cnica. a su interpretaci車n sedimentol車gica. Como complemento del estudio al M.E.B. se han realizado an芍lisis granulom谷tricos, estudios a la lupa binocular y microscopio petrogr芍fico de todas las muestras recogidas. Para una mejor y m芍s f芍cil comprensi車n de la) terminolog赤a utilizada en la descripci車n de los caracteres texturales de los granos de cuarzo al M
%K Sedimentary environments
%K glossary
%K surtace textures
%K diagenesis
%K pedogenesis.
%K Medios sedimentarios
%K glosario
%K texturas superficiales
%K diag谷nesis
%K edafog谷nesis.
%U http://estudiosgeol.revistas.csic.es/index.php/estudiosgeol/article/view/672/699