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首页> 外文OA文献 >Late Permian continental sediments in the SE Iberian Ranges,udeastern Spain: Petrological and mineralogical characteristicsudand palaeoenvironmental significance
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Late Permian continental sediments in the SE Iberian Ranges,udeastern Spain: Petrological and mineralogical characteristicsudand palaeoenvironmental significance

机译：SE伊比利亚山脉的晚二叠世大陆沉积物， ud西班牙东部：岩石和矿物学特征 ud和古环境意义

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摘要

A detailed mineralogical and petrological study and the analysis of paleosol profiles in continental alluvial sediments of theudLate Permian in the SE Iberian Ranges (Spain) allow us to infer the significant environmental changes that occurred during thisudtime period. Three parts have been distinguished in the Late Permian sediments (Alcotas Formation). The lower part includesudabundant and well-preserved carbonate paleosol profiles and fine-grained sediments made up by quartz, feldspar, hematite andudillite, with scarce kaolinite. The preservation of dolomicrite in some paleosols suggests that they originally developed asuddolocretes in an arid to semi-arid climate with marked seasonality.udA change towards more humid and acid conditions can be deduced from the presence of siderite and goethite in paleosols inudthe middle part of the Alcotas Formation. Moreover, the presence of plant remains, coal beds and/or carbonaceous shales at theudtop of the middle part, and the lack of carbonate paleosols in the upper part of the formation would indicate a further stepudtowards acid conditions. These conditions would increase until the Early Triassic, as indicated by the lack of carbonates and theudpresence of Sr-rich aluminium phosphate sulphates (APS minerals) at the base of the Triassic (Can˜ izar Formation), whichudclearly indicates extreme acid conditions during the Permian–Triassic transition of the study area.
机译：对详细的矿物学和岩石学研究以及东南伊比利亚山脉（西班牙）晚二叠世大陆冲积沉积物中古土壤剖面的分析，使我们能够推断出在此晚时期发生的重大环境变化。在二叠纪晚期沉积物（阿尔科塔斯组）中已将其分为三个部分。下部包括多量且保存完好的碳酸盐古土壤剖面，以及由石英，长石，赤铁矿和 udillite组成的细颗粒沉积物，以及稀少的高岭石。白云岩在某些古土壤中的保存表明，它们最初是在干旱至半干旱气候下以明显的季节性发展成 uddolocretes。在阿尔科塔斯组的中部。此外，在中部 utop顶部存在植物残骸，煤床和/或碳质页岩，并且在地层上部缺少碳酸盐古土壤将表明进一步向酸性条件迈进。这些状况将一直持续到三叠纪早期，这是由三叠纪（坎〜伊扎尔组）的底部缺乏碳酸盐和富Sr的磷酸铝硫酸盐（APS矿物）所表明的，这显然表明了极端酸性。研究区二叠纪-三叠纪过渡时期的条件。

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