The Ameke Abam-Ebenebe Sand Ridge, SouthEastern Nigeria: A Fluvio-Deltaic Deposit

Publication Date : 20/12/2019


Author(s) :

Odunze-Akasiugwu, Onyinye Shirley , Obi, Gordian Chuks.


Volume/Issue :
Volume 1
,
Issue 1
(12 - 2019)



Abstract :

The Ameke Abam-Ebenebe sand ridge is the most prominent linear sand body within the present landscape of southeastern Nigeria. The ridge extends laterally for over 150km between the alluvial plains of the Cross River and the Niger River in southeastern Nigeria. It protrudes up to 600 meters above sea level in the vicinity of Umunze. Topographic analysis reveals that the morphology of the sand ridge is consistent with the definition of a cuesta. The sand body is sub-parallel to the Enugu Cuesta and to the present Nigerian Coastline. These geomorphological parameters provide the first indication of the influence of strong tidal currents in the formation of the sand ridge. Lithofacies and textural analyses reveal that the ridge is composed of fine to very coarse-grained/pebbly, moderately well-sorted sand associated with various types of current- and tide-generated sedimentary structures. Analysis of the grain-size distribution plots indicates that the sands accumulated in a fluvio-deltaic environment (a zone lying between the marine and sub aerial portion of the delta). Pebble form indices indicate that the sand ridge was constructed in a coastal environment, in a zone of interaction between wave and fluvial processes.


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