Chris G. Howells1,
Alan J. Scott2,
(1) Anadarko Algeria Corporation, Uxbridge, United Kingdom
(2) Alan J. Scott and Associates, Boulder, CO
Abstract: Climatically controlled stratigraphic architecture of the Trias Argilo Greseux Inferior (TAGI) of the Berkine Basin, North Africa
Extensive core-based studies, integrated with other methods of sedimentological analysis, show the Trias Argilo Greseux Inferior (TAGI) of the Berkine Basin to be a complex continental red bed sequence containing components of fluvial, deltaic, lacustrine and aeolian environments. These components are arranged cyclically on several scales with “key marker beds” that can be recognised over lateral distances in excess of 200 km. The smallest scale of cyclicity reflects the successive filling of ephemeral lakes in an overall setting of low accommodation space that is partly controlled by climate and lake base-level fluctuations. Larger scale climatic cycles provide a basis for the development of regionally expansive lakes and deposition of the key markers that allow for the tripartite subdivision of the Trias Argilo Greseux Inferior throughout the Berkine Basin. The major aspects of Trias Argilo Greseux Inferior stratigraphy and the sedimentological model are compared to and contrasted with more conventional interpretations of fluvial-dominated red bed sequences.
AAPG Search and Discovery Article #90914©2000 AAPG Annual Convention, New Orleans, Louisiana