THE DISTRIBUTION OF MINOR DYKE- LIKE BODIES AROUNDZARIA (PART OF ZARIA SHEET 102 S.W.)
THE DISTRIBUTION OF MINOR DYKE- LIKE BODIES AROUNDZARIA (PART OF ZARIA SHEET 102 S.W.)
No Thumbnail Available
Date
1978-05
Authors
ADEBISI, MUFTAU DERE
Journal Title
Journal ISSN
Volume Title
Publisher
Abstract
Outcrops of porphyritic biotech granite in S.W. Zaria
were traversed for the occurrence of minor dyke-like bodies.
A total of 176 legitimates, 95 microgravity dykes and
110 quartz veins were located and their distribution and
mineralogy were investigated.
These minor dyke bodies occur mainly in the porphyritic
biotech granite in the form of dykes, veins and vein-lets.
They maintain sharp contact with the host rock, crosscutting
relationship with one another and have regular trends
ie.
Micro-granites trends most NHW and NNE
Legitimates trends mostly NNW and N - S.
Quartz veins trends mostly NW, E NE and N - S.
The cross-cutting relationship between each of the minor
formations particularly micro-granites and legitimates suggests
that there occurred several phases of phlegmatic and micro-granite
emplacement in the porphyritic biotech granite.
Similarly, cross-cutting relationship between the minor
formations suggests that the microgrooves are older than the
legitimates which are in turn older than quarts veins.
The presence of porphyritic biotech granite's monolith
in these dykes, their regular trends and the sharp nature of
their contacts suggests that they were intruded into the
porphyritic granite. The sugary or apolitical texture of the
micro-granites suggests crystallization from melt under high
pressure condition without formation of aqueous phase while
the coarse texture of legitimates also suggest crystallization
from melt under low pressure in the presence of aqueous
phase and slow cooling for the development of large crystals.
Similar observations were made by Jahns and Durham
(1957), Ajibade (1977) and Hookah (1977) on Mamba legitimates.
Judging by the siliceous nature of the quartz veins, and
the age relationship of these dykes, there appeared a trend
of Igneous activity marked by the emplacement of micro-granites,
legitimates and quartz veins.
On the basis of these observations, a magmatic origin
was proposed for the minor dyke like bodies and the porphyritic
biotech granite.
Description
THESIS SUBMITTED TO THE DEPARTMENT OF
GEOLOGY, AHMADU BELLO UNIVERSITY,ZARIA
IN PARTIAL FULFILLMENT OF THE AWARD OF
BACHELOR OF SCIENCE DEGREE IN GEOLOGY
BY
MUFTAU ADEBISI DERE
APRIL, 1978
Keywords
DISTRIBUTION,, MINOR,, DYKE,, LIKE,, BODIES,, AROUND,, ZARIA,, PART OF ZARIA