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La tendencia mineralógica de las eolianitas del Pleistoceno de Mallorca, mediante la aplicación del método de Chung

AuthorsCalvet, F.; Plana Llevat, Feliciano; Traveria i Cros, Adolf
KeywordsMétodo de Chung
Issue Date1980
PublisherCSIC - Instituto de Ciencias de la Tierra Jaume Almera (ICTJA)
CitationActa Geológica Hispánica, t. XV (1 980), n.º 2, págs. 39-44.
Abstract[ES] El objetivo de este trabajo es conocer la evolución diagenética de los minerales carbonatados de las eolianitas del Pleistoceno de Mallorca. Se ha puesto de relieve un control de la composición original y un control climático en la tendencia mineralógica de las eolianitas. Para la determinación cuantitativa se ha utilizado el método de Chung.
[EN] The objective of the present work is to know the diagenetic evolution of the carbonated minerals found in the Pleistocenic eolianites of Mallorca island. The island of Mallorca shows three main areas where Pleistocenic and Recent eolianites are well developed (Fig. l), which have been named A area (in Palma Bay), B area (in Colonia St. Jordi), and C area (Alcudi Bay). Those three outcrops present relatively different climas (Fig. 2). A and B areas are placed in a zone of a semiarid type of clima whilst area C shows a dry-subhumid clima type. The main eolianite levels studied have been Flandrian (with an age of 2000 to 7000 years), Würm (aprox. 25000 years), Riss (aprox. 300.000 years) and Mindel (aprox. 500.000 years). The mineralogical evolution of the eolianites during the Pleistocene of Mallorca, that is during the stratigraphic time, is showed schematically in fig. 3 Each eolianite has a determinate diagenetic path according to its original petrological evolution. Figs. 4, 5 and 6 show the different diagenetic paths for the Pleistocenic eolianites of Mallorca in areas A, B and C respectively. Fig. 7 shows the synthesis of the diagenetic trend of those eolianites. Mineralogical changes in the mineralogical trend of the eolianites are caused by a set of diagenetic processes: the elimination of the HMC is due to the transformation HMC-LMC by means of the cryptocristalline reordering mechanism of the initially HMC fragments. The elimination of the aragonite, is due to the disolution -formation process of moldic porosityinfilling by LMC spar cement and to the aragonite-LMC neomorphic process. Taking into account that the number of differentiated phases to be determined is low (three or four), the matrix flushing method was chosen for the treatment of limestones, because the presence of rare phases or amorphous materials, do not influence the relative proportions of the main constituents to be determinated. Also this method does not need interna1 standard and it is relatively quick. After determining the quotients of the intensities of the component-corindon mixtures the K's were obtained using natural materials, since these have more resemblance to the geological samples than the most pure chemical products. Five preparations were obtained from each one of the samples, adopting the quotient of the average intensities as the value of the standard K.
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