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
Citation
Collections