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Facies Distribution and Geometry of El Gueria Formation in Concession 137N: Preliminary Results of a Field Analog Study from Kesra Plateau

Presented at Second Symposium on the Sedimentary Basins of Libya
PublisherTripoli : Earth Science Society of Libya
Publication date2003

As a field analog to "B" field in Concession 137N in Tarabulus Basin, Kesra Plateau (80 km NW of Kairouan city, Tunisia) and its late Ypresian-Lutetian carbonate units have been studied in detail. These nummulitic facies also present a good field case for studying the facies distribution and geometry in a nummulitic depositional system affected by submarine palaeohighs. Two main facies tracts have been recgnized: 1) nummulitic packstone and grainstone, well developed in the western part of the plateau; and 2) skeletal-poor dolomitised wackstones and packstones with abundant nummulithoclasts well represented in the northern, southeastern and eastern parts. Between these two end members, high-energy facies with oysters and large robust nummulites passing to forebank facies with adundant discocyclinids and flat nummulties can be observed. Storm-deposited events and a high degree of bioturbation have been observed within the low-energy deposits with common nummulitic debris. A sedimentological model has been established for the nummulitic facies of Kesra Plateau showing similar facies variations as the ones in "B" field in offshore Concession 137N. Sequence stratigraphic analysis allowed correlation of nummulitic and nummulithoclastic facies, which were probably interfingered during this period. Structural activity was a major control in both areas. The main difference observed between these two models is the lack of lagoonal facies (characterised by abundant miliolids) in Kesra Plateau, whereas they are present and well represented in B field.

Citation (ISO format)
JORRY, Stéphan, BEN-AHMAD, M., CANTALOUBE, S. Facies Distribution and Geometry of El Gueria Formation in Concession 137N: Preliminary Results of a Field Analog Study from Kesra Plateau. In: The geology of northwest Libya: Ghadāmis, Jifārah, Ṭarābus and Ṣabrātah Basins. Tripoli : Earth Science Society of Libya, 2003. p. 99–105.
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