Abstract:
Sabaloka region comprises some of the old basement rocks in Sudan
surrounded with Cretaceous sediments forming an inlier, extending
between Khartoum and River Nile States. The study area is located
inside this inlier between latitudes N 16 00′ - 16 30′ and longitudes 32
40′ - 33 10′. The digital image processing of Landsat 8 (OLI) oriented to
enhance the satellite images to discriminate the boundary between the
different rock units in the inlier and their dimensions. Also to explain the
structural features at macro scale, recognize and analyze them. The
geological perspective of the area is the granulite rocks of Precambrian
age exposed within the retrograded gneisses and migmatite rocks which
are prevalent in the region of inlier. There are also batholitic rocks of
Ban Gadeed, El-Soulik, Ba Bados, and Abu Gedium granites in their
foliations. The granulite rocks are two types meta-igneous (enderbite),
and meta-sediments (semi-pelitic and calc-silicate).
Field observations, satellite image views, and microscopic studies of
microstructures indicate that Precambrian rocks of Sabaloka inlier have
orientations of shear foliations of Ban Gadeed-Gamrab Shear Zone
(BGSZ) with general trend NW-SE, and it may be the last activity of the
Precambrian deformations in the Sabaloka inlier. Ban Gadeed-Gamrab
Shear Zone (BGSZ) has affected the Precambrian rocks only and did not
affect the younger rocks of the region.
