STRUCTURAL AND TECTONIC INTERPETATIONS OVER PARTS OF THE NORTHERN DELTA DEPOBELT USING GRAVITY AND LANDSAT TM DATA

AUTHOR: WILSON, PEACE UDO

DEPARTMENT: Physics

SCHOOL: School of Physical Sciences (SOPS)

AFFILIATION: Federal University of Technology Owerri

Structural and tectonic interpretation over part of the Northern Delta Depobelt, Niger Delta Basin was carried out over an area that lies between latitudes 5⁰00’N-6⁰15′ and longitudes 6⁰30’E-7⁰10’E, with the aim of determining the structural and tectonic structures of the basin. The acquired data were processed, corrected and further reduced to Bouguer anomaly values. Similarly, the residual anomaly was obtained after removing the regional field using the polynomial fitting method. The Bouguer gravity anomaly values revealed significant gravity minimum ranging from -100 to-170 g.u which was interpreted as a thick sediment graben. The minimum gravity values revealed is believed to be as a result of an uncompensated down warp of the crust or density contrast within the basement. Similarly, the positive values of the Bouguer anomaly were of the range 0 to 80g.u. These maximum values are attributed to the underlying basement which has high crustal materials suggesting a shallow basement with thick overburden interpreted as horst structure. The basement depth of 8km was deduced from the spectral depth. This layer may be attributed to deeper density rocks intruded onto the basement surface. Results from Landsat TM revealed the existence of dense lineaments around Ndom, while areas like Orsu and Urualla have sparse concentration of lineaments. Rose diagrams produced by plotting the strikes and lengths of all the lineaments revealed structural trends in the E-W, NNW-SSE, N-S and NE-SW directions with dominant trends of NE-SW and NW-SE directions. Structural and tectonic features mainly growth faults with dominant trends of NE-SW and NW-SE directions which are interpreted in areas of low gravity values coincided with the positions of producing fields in the study.

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