期刊
MARINE AND PETROLEUM GEOLOGY
卷 79, 期 -, 页码 222-256出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.marpetgeo.2016.10.019
关键词
Biostratigraphy; Sedimentology; Triassic; TAGI; Saharan Platform; Tunisia
资金
- Polish scientific funds [N307 011 31/094]
- Polish Ministry of Sciences and Higher Education [7986/B/P01/2011/40]
- University of Warsaw [51/I/2014]
- Faculty of Biology of University of Warsaw
- Department of Paleobiology and Evolution of University of Warsaw
- Faculty of Sciences of Tunis [UR 11 ES 15]
The red beds of the Triassic succession outcropping at Tejra-Medenine (southern Tunisia, Saharan Platform) have yielded rich fossil assemblages of both freshwater and brackish-marine invertebrates and vertebrates. The new discovered fauna indicates an Anisian-Lower Ladinian age for the Tejra section. Its lowermost part is considered as equivalent of Ouled Chebbi Formation, while the medium and upper parts are considered as equivalent of the Kirchaou Formation. Both sedimentological characteristics and fossil assemblages indicate the increasing marine influences within the middle part of the section and the migration of brackish and freshwater fauna into the lacustrine/playa environment at the top. The marine fauna-rich interval of the Tejra section correlates well with the well-known Myophoria-rich carbonate stratigraphic marker confirming the Middle Triassic (Ladinian) major transgression well recorded eastward in the Tunisian Jeffara basin and in Libya. The use of this Ladinian stratigraphic event in addition to the Carnian carbonate transgressive events of the Jeffara escarpment outcrops was of great help for regional lithostratigraphic correlations between the Triassic outcropping series and those currently buried in Ghadames and Berkine basins. The age of the sandstones of Trias Argilo-Greseux Inferieur (TAGI) which forms the main oil and gas reservoir in the Saharan domain is attributed to the Anisian-Carnian and considered as coeval of Ouled Chebbi and Kirchaou Formations of the Dahar escarpment. An updated synthetic stratigraphic chart is proposed for the Triassic of Saharan Platform domain on the basis of the compilation of the new obtained results and the subsurface data taken from published literature. (C) 2016 Elsevier Ltd. All rights reserved.
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