Publication: Naturaleza, origen y distribución de los minerales de la arcilla en la Cuenca Triásica (Keuper) del área de Valencia.
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1987
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Abstract
Se realiza un estudio mineralógico y petrogenético de las lutitas del Keuper en relación con su litoestratigrafía (ORTI, 1974) en la región de Levante. Los datos obtenidos se comparan con los de otras áreas de la Cordillera Ibérica, así como con otras cuencas europeas. Se ha establecido una evolución de asociaciones mineralógicas de muro a techo y de O a E que indica un incremento de las condiciones de hipersalinidad en este sentido. La abundancia de cuarzo, feldespato y micas detríticas en las unidades basales y en la zona O, así como la existencia de la asociación magnesita-corrensita en la zona E (figs. 3, 4 y 10) refleja la evolución anteriormente citada. El componente arcilloso fundamental de las lutitas en las formaciones Kl, 1(2 y K3 es la ilita con clorita subordinada (figs. 3 y 4), mientras que en la formación k4 los componentes mayoritarios son los interestratificados 14c-14m, con ilita en menor proporción. Las ilitas pueden tener dos orígenes por un lado a partir de la rotura y degradación de micas detríticas> como sucede en las formaciones Kl y k2 y otras proceden de la alteración de los feldespatos (formación k3). Las cloritas son detríticas en su mayor parte en las dos formaciones inferiores, y autigénicas o rejuvenecidas en las formaciones superiores. Los minerales interestratificados 14c-14m son irregulares con exceso de capas de clorita en las formaciones K3 (zona E) y k4 (zona O), siendo regulares en la formación k4 (zona E) al repartirse el Mg entre la agradación de arcillas (montmorillonita y cloritas heredadas del contienente) y la formación de magnesita.
A mineralogical and petrogenetic study of the Keuper lutites in relation to its lithostratigraphy (ORTI, 1974) in the region of Levante is done. The results are compared with other areas of the Iberian Range, as well as with other European basins. An evolution of the mineralogical associations from bottom to top and from W—>E is established indicating an increase of the hipersalinity along this trend. The high contents of quartz, feldspars and detrital micas in the lower units and in the western zone, and the presence of magnesite-corrensite in the eastern zone (figs. 3, 4, 10) demonstrates the evolution described. The principal argillaceous constituent of the lutites in formation Kl, K2 and K3 is illite with subordinated chlorite (figs, 3 and 4), whereas iii unit K4 the principal components are 14c-14m mixed layers with low contents of illite. The illite can be formed by breakage of brittle detrital micas like in formations Kl and K2 and by alteration of K-Feldespars (Formation K3). The chlorites are mostly detrital in the two lower formations, and authigenic or rejuvenated in the upper formations. The 14c-14m mixed layers are irregular with an excess of chlorite in formations k3 (eastern zone) and K4 (western zone); in formation K4 (eastern zone) tbe mixed layer are regular because part of the Mg in distributed in the agradation of clays (montmorillonites and inherited chlorites from the continent) and the rest is used in the formation of magnesite.
A mineralogical and petrogenetic study of the Keuper lutites in relation to its lithostratigraphy (ORTI, 1974) in the region of Levante is done. The results are compared with other areas of the Iberian Range, as well as with other European basins. An evolution of the mineralogical associations from bottom to top and from W—>E is established indicating an increase of the hipersalinity along this trend. The high contents of quartz, feldspars and detrital micas in the lower units and in the western zone, and the presence of magnesite-corrensite in the eastern zone (figs. 3, 4, 10) demonstrates the evolution described. The principal argillaceous constituent of the lutites in formation Kl, K2 and K3 is illite with subordinated chlorite (figs, 3 and 4), whereas iii unit K4 the principal components are 14c-14m mixed layers with low contents of illite. The illite can be formed by breakage of brittle detrital micas like in formations Kl and K2 and by alteration of K-Feldespars (Formation K3). The chlorites are mostly detrital in the two lower formations, and authigenic or rejuvenated in the upper formations. The 14c-14m mixed layers are irregular with an excess of chlorite in formations k3 (eastern zone) and K4 (western zone); in formation K4 (eastern zone) tbe mixed layer are regular because part of the Mg in distributed in the agradation of clays (montmorillonites and inherited chlorites from the continent) and the rest is used in the formation of magnesite.