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Some examples of the Middle-Triassic Marine transgression in South-Western Mediterranean Europe (1982)

Gandin, A. ; Tongiorgi, M. ; Rau, A. ; [et al.]

Springer

International journal of earth sciences 71 (1982), S. 881-894

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ISSN: 1437-3262

Source: Springer Online Journal Archives 1860-2000

Topics: Geosciences

Description / Table of Contents: Abstract In Southwestern Mediterranean Europe (NE Spain, Sardinia and NW Apennines e. g. Monti Pisani and Punta Bianca) the Middle-Triassic transgression on a margin of an intracratonic basin appears to be controlled by the different morphology and tectonic activity of the margin itself. The analysis of some sequences leads to recognize three different kinds of margins: 1. margin with a narrow shelf sloping toward a very shallow restricted basin (Central and Southwestern Sardinia); 2. margin with a broad shelf gently sloping toward a shallow basin (NE Spain, Monti Pisani, NW Sardinia); 3. margin with a narrow shelf and steep slope marked by tectonic and volcanic activity (Punta Bianca).

Abstract: Résumé Dans l'Europe méditerranéenne sud-occidentale (Espagne nord-orientale, Sardaigne et Apennin nord-occidental: Monti Pisani et Punta Bianca) la transgression du Trias moyen sur la marge d'un bassin intracratonique semble controllée par la différente morphologie et l'activité tectonique du marge même. L'analyse de plusieurs sequences permit de reconnaître trois types différents de marge: 1. marge caractérisée par une ample plate-forme se reliant à un bassin très peu profond et restreint (Sardaigne centrale et sud-occidentale); 2. marge caractérisée par une ample plate-forme se reliant par une pente très douce à un bassin peu profond (Espagne nord-orientale, Monti Pisani, Sardaigne nord-occidentale); 3. marge caractérisée par une plate-forme étroite, une pente raide et marquée par une activité tectonique et volcanique (Punta Bianca).

Notes: Zusammenfassung In SW-Europa (NE-Spanien, Sardinien und NW-Apennin: Monti Pisani, Punta Bianca) scheint die mittel-triasische Transgression über Randgebiete eines intrakratonischen Beckens durch die Morphologie der Beckenränder selbst und die tektonische Aktivität entlang dieser bedingt zu sein. Die Analyse einiger sedimentärer Abfolgen erlaubt eine Unterscheidung dreier Typen solcher Beckenränder: 1. Beckenrand mit schmalem Schelf, der gegen ein untiefes Becken mit eingeschränkter Wasserzirkulation abfällt (Zentral- und SW-Sardinien); 2. Beckenrand mit breitem Schelf, der graduell in ein seichtes Becken übergeht (NOSpanien, Monti Pisani, NW-Sardinien); 3. Beckenrand mit schmalem Schelf und angrenzendem steilem ‚slope“, charakterisiert durch tektonische und vulkanische Aktivität (Punta Bianca).

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF01821109

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Permian to Triassic sequences from selected continental areas of southwestern Europe (2007)

Virgili, C. ; Cassinis, G. ; Broutin, J.

In: Geological Society Special Publication 265: 231-259.

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Publication Date: 2007-10-08

Description: This contribution is a tentative reconstruction of the still-debated geological history in the primarily continental domains now represented in various parts of southwestern Europe, between the end of the Variscan diastrophism and the beginning of the Alpine sedimentary evolution. Data and interpretations vary from one region of terrestrial rocks to another. Despite this, we have tried to highlight the most typical and significant geological features. From the Carboniferous to Triassic, palaeontological investigations of the macroflora, microflora and tetrapod footprints, as well as radiometric data, generally point out the presence of three main tectono-stratigraphic units' (TSUs), separated by marked unconformities and gaps of as yet uncertain duration. The most important geological episode generally started about the Early/Middle Permian boundary and later spanned discontinuously and intensely throughout Middle Permian (Guadalupian) time. It was characterized by specific tectonic, magmatic, thermal and basinal features, which could mark the presumed change suggested by some authors from a Pangaea B to a Pangaea A. In this context, it is worth mentioning that the unconformable Middle?-Upper Permian higher TSU in Spain consists of Buntsandstein'-type red beds, sometimes yielding a Thuringian flora; differently, in southern France, such as in the Lodeve area, the Buntsandstein is Anisian and thus constitutes a later Triassic sequence, which rests unconformably above the as yet undefined (Mid-Late) Permian age assessment of the La Lieude fossil site'; in the Southern Alps, the Second tectono-sedimentary Cycle' emphasized from the recent literature, which is initially made up of the Verrucano Lombardo-Val Gardena Sandstone red clastics, is in part laterally and upwardly replaced, east of the Adige Valley, by the sulphate evaporite to shallow-marine Bellerophon Formation. It is thus represented by continental and marine sediments generally pertaining to Late Permian (post- Lower Tatarian') time and can be interpreted, in the light of the geological context of the region, as an Upper Permian and Lower Triassic TSU of a slightly younger numerical order (i.e. TSU 3 in place of TSU 2).

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