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- W3193687390 abstract "espanolSe ha realizado el estudio textural y mineralogico de 65 muestras procedentes de dos sondeos largos y siete sondeos cortos realizados en le Parque Nacional de Donana. Sobre la base del analisis granulometrico se han diferenciado seis facies sedimentarias de edad Pleistoceno superior-Holoceno. Estas facies estan compuestas predominantemente de sedimentos de grano fino, localmente erosionadas por facies de granulometria mas gruesa. Los resultados indican una mineralogia global constituida principalmente por la asociacion mineralogica: filosilicatos (moscovita, paragonita, minerales de la arcilla) - carbonatos (calcita, dolomita) – cuarzo - feldespatos (Ca-Na,K) - minerales pesados. En la mineralogia de la arcilla la asociacion es: esmectita-illita-caolinita-(clorita, interestratificados). El notable incremento de illita en la facies FA-5, cuando se compara con los materiales sobre los que se deposita erosivamente, confirma junto a criterios sedimentologicos y paleontologicos, la identificacion de varias capas de tsunamitas en la zona estudiada. EnglishThe textural and mineralogical study of 65 samples from two long cores and seven short coresdrilled in Donana National Park has been done. On the basis of grain-size analysis, six sedimentaryfacies dated as Late Pleistocene-Holocene have been differentiated. These facies mainly consist of finegrained sediments, locally eroded and filled with coarser grained sediments. The results indicate a bulkmineralogy association made-up of_ phyllosilicates (muscovite, paragonite, clay minerals)-carbonates(calcite,dolomite)-feldspars (Ca-Na,K)-heavy minerals. Clay mineral assemblage is composed of_smectite-illite-kaolinite-(chlorite, mixed layers). The significant illite increase in facies FA-5 whencompared with underlying sediments, besides sedimentological and paleontological evidencescorroborates the identification of several tsunamite beds in the studied sector." @default.
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- W3193687390 date "2008-01-01" @default.
- W3193687390 modified "2023-09-23" @default.
- W3193687390 title "Caracterización mineralógica de facies sedimentarias de edad Pleistoceno superior-Holoceno en el Parque Nacional de Doñana (Huelva): implicaciones paleoambientales" @default.
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