Altérations du soubassement de la couverture permotriasique en Espagne
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Abstract:
In Spain, the superficial part of the Hercynian basement, under the Permo-triassic cover, appears in two quite different ways : - when the Paleozoic basement is directly covered by the Buntsandstein sandstones, it is altered and rubefied on one or some ten meters of thickness ; - when the Paleozoic basement is covered by the Permian detrital formations, it is not altered. Therefore, a comparative study of clay minerals was performed in the Paleozoic basement and in its altered fades, as well as in the Permian and Triassic sediments.Keywords:
Basement
Paleobotany
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Conglomerate
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Red beds
Apparent polar wander
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Summary The Palaeozoic rocks of Hydra consist of a sequence of limestones and dolomites with some interbeds of shales and sandstones. Fusulinid foraminifera indicate the sequence is entirely Permian in age and not Carboniferous and Permian as previously thought.
Lernaean Hydra
Sequence (biology)
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In Spain, the superficial part of the Hercynian basement, under the Permo-triassic cover, appears in two quite different ways : - when the Paleozoic basement is directly covered by the Buntsandstein sandstones, it is altered and rubefied on one or some ten meters of thickness ; - when the Paleozoic basement is covered by the Permian detrital formations, it is not altered. Therefore, a comparative study of clay minerals was performed in the Paleozoic basement and in its altered fades, as well as in the Permian and Triassic sediments.
Basement
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Because of the poor preservation of the available material, Warthia species collected from fine-grained Carboniferous-Permian sandstones at Taio (Santa Catarina) cannot be identified with any of the Warthia species described from North America or from Australia. The occurrence of Warthia in the Permian of Brazil is not questioned since it is common in the Permian in both North America and Australia.
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The Permian System in the Jilong area,southern Tibet is subdivided into the Jilong and Quburiga formations,which are composed of a set of medium-thick beded limestones,quartzose sandstones,and mudstones.Abundant fossils were found in the Permian strata,including twenty three genera and forty species of brachiopods,seven genera and ten species of anthozoans,twelve genera and four species of bryozoans,one genera and two species of ammonoids,some crinoids,and inchnofossils.Five brachiopod assemblages,one ammonoid zone,two anthozoan assemblages,one crinoid horizon,and one ichnofossil horizon were established from the Permian System in the Jilong area.On the basis of lithostratigraphic and biostratigraphic data,the Jilong Formation is regarded as the deposits of Early Permian Artinskian-Sakmarian stage,and the Quburiga Formation can be correlated to the Chihsian-Maokouan stages,with the top Quburiga Formation belonging to the Middle-Late Permian Wuchiapingian Stage.
Crinoid
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