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.
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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
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