%0 Journal Article
%A Benito Moreno, María Isabel
%A Horra del Barco, Raúl de la
%A Fernández Barrenechea, José María
%A López Gómez, José
%A Rodas, Magdalena
%A Alonso Azcárate, Jacinto
%A Arche, Alfredo
%A Luque del Villar, Francisco Javier
%T Late Permian continental sediments in the SE Iberian Ranges,eastern Spain: Petrological and mineralogical characteristicsand palaeoenvironmental significance
%D 2005
%@ 0031-0182
%U https://hdl.handle.net/20.500.14352/50256
%X A detailed mineralogical and petrological study and the analysis of paleosol profiles in continental alluvial sediments of theLate Permian in the SE Iberian Ranges (Spain) allow us to infer the significant environmental changes that occurred during thistime period. Three parts have been distinguished in the Late Permian sediments (Alcotas Formation). The lower part includesabundant and well-preserved carbonate paleosol profiles and fine-grained sediments made up by quartz, feldspar, hematite andillite, with scarce kaolinite. The preservation of dolomicrite in some paleosols suggests that they originally developed asdolocretes in an arid to semi-arid climate with marked seasonality.A change towards more humid and acid conditions can be deduced from the presence of siderite and goethite in paleosols inthe middle part of the Alcotas Formation. Moreover, the presence of plant remains, coal beds and/or carbonaceous shales at thetop of the middle part, and the lack of carbonate paleosols in the upper part of the formation would indicate a further steptowards acid conditions. These conditions would increase until the Early Triassic, as indicated by the lack of carbonates and thepresence of Sr-rich aluminium phosphate sulphates (APS minerals) at the base of the Triassic (Can˜ izar Formation), whichclearly indicates extreme acid conditions during the Permian–Triassic transition of the study area.
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