A REVIEW OF THE STRUCTURE AND PETROLOGY OF THE KUDARU RING COMPLEX
A REVIEW OF THE STRUCTURE AND PETROLOGY OF THE KUDARU RING COMPLEX
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Date
1980-06
Authors
ADAMU, BAKO MUHAMMAD
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Abstract
The geological map of Kudaru complex has a characteristically
elliptical ring-dyke structure already described by earlier workers.
Hocks on this complex consist mostly of alkali granites and their
subvolcanic and volcanic equivalents. The major rock types ares
Quartz porphyry, granite porphyry, fayalita granite, Biotite and
Biotite granite and rhyolites.
Contrary to the assumption that the ring dyke is made up of
one rock type, it has been confirmed in the field and on the
microscope that the ring dyke is made up of two rock types namely
the quartz porphyry and the granite porphyry.
The cone-sheets can be divided into three major petrological
units?
- The granite porphyry
- Fine grained riebeckite granite
- Rhyolite.
The southward displacement of the 'central1 pluton beyond the
confines of the ring-dyke has important implications which include:
1. A southward shift in the centre of magmatic activities
analogous to the already well documented migration of
ring-complexes in the Niger-Nigeria Younger Granite Province.
2. Hydrothermal alteration of the rock (notably the granite
porphyry ring dyke) in contact with the displaced granite.
The presence of extrusive volcanic rock is reported by the
writer and its apparently small size is most probably a result
of erosional activity which must have eroded a large portion of
the rock during geological time. The presence of this rock also
helps to suggest that the ring dyke was emplaced by the process
of surface cauldron subsidence, a process which Bain (1934) was
unable to suggest.
Description
A THESIS SUBMITTED TO THE DEPARTMENT OF GEOLOGY,
AHMADU BELLO UNIVERSITY, ZARIA, AS PARTIAL
FULFILLMENT FOR THE AWARD OF A BACHELOR OF
SCIENCE DEGREE IN GEOLOGY
Keywords
REVIEW,, STRUCTURE,, PETROLOGY,, KUDARU,, RING,, COMPLEX