GEOLOGY AND STRUCTURAL EVOLUTION OF DANKO, SHEET 74SW PART OF ZURU SCHIST BELT, NORTHWESTERN NIGERIA
GEOLOGY AND STRUCTURAL EVOLUTION OF DANKO, SHEET 74SW PART OF ZURU SCHIST BELT, NORTHWESTERN NIGERIA
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Date
2016-10
Authors
ALIYU OHIANI, UMARU
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Abstract
The study area is located within the northwestern part of the Zuru Schist Belt, which is the
largest schist belt in northwestern Nigeria. The major rock types in the study area consist of
quartzites, muscovite schists and medium grained granite; while the minor rocksare quartz veins
and pegmatites which have a dominant NE-SW trend.Petrographic studies have shown that
quartzite is composed of quartz and muscovite. Muscovite schist is composed of quartz, biotite
and muscovite while medium grained granitesiscomposed of quartz, muscovite, microcline,
perthite and sericite. Structures identified were classified into ductile and brittle structures.
Folds and foliations constitute the ductile structures, while joints are the brittle structures.
Analysis of these structures using rose diagrams and stereographic projections shows that they
are dominantly oriented in the E-W, NW-SE, NE-SW and N-S directions. E-W is the minor
trending direction, NW-SE, NE-SW and N-S are the major trends. Remote sensing analysisof
linear structures within the study area using Global Mapper V15 and ArcGis software reveals a
dominant NNE-SSW trend, as well as abundant N-S lineaments and E-W lineaments.Field
studies such as attitude of planar and linear structures, orientation of fold axial planes, styles of
folding and over-printing of one fabric by another reveal that the study area has experienced
polyphase episodes of deformation denoted as D1 and D2. The first phase D1 is associated with
the development of an S1 schistosity foliation and a low-lying and partially obliterated minor F1
folds. The second phase D2 involved heterogeneous deformation which gave rise to an S2
crenulation foliation of the earlier S1 structure and an F2 major tight to isoclinal folds. Strain
analysis employing (Fry, 1979) technique shows that the study area is heterogeneous in nature
as is evident from the varying orientations of halos in the NW-SE, NE-SW and N-S directions.
Description
A DISSERTATION SUBMITTED TO THE SCHOOL OF POSTGRADUATE STUDIES,
AHMADU BELLO UNIVERSITY, ZARIAIN PARTIAL FULFILLMENT OF THE
REQUIMENTS FOR THE AWARD OF AMASTERS DEGREE IN GEOLOGY
(STRUCTURAL)
Keywords
GEOLOGY AND STRUCTURAL EVOLUTION, STRUCTURAL EVOLUTION OF DANKO,, STRUCTURAL EVOLUTION OF DANKO, SHEET 74SW PART OF ZURU SCHIST BELT,, STRUCTURAL EVOLUTION OF DANKO, SHEET 74SW PART OF ZURU SCHIST BELT, NORTHWESTERN NIGERIA