GRAVITY SURVEY OF SHIRA YOUNGER GRANITE- RING COMPLEX OF NORTHERN NIGERIA

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dc.contributor.authorOGBUOJI, ONYIBA NNACHI
dc.date.accessioned2017-07-13T11:21:04Z
dc.date.available2017-07-13T11:21:04Z
dc.date.issued1981-09
dc.descriptionThesis submitted to the Ahmadu Bello University Zaria in partial fulfilment of the requirements for the award of the degree of MASTER OF SCIENCE IN APPLIED GEOPHYSICS. Department Physics Ahmadu Bello University, Zaria - Nigeria.en_US
dc.description.abstractThe gravity survey over the Shira Younger Granite Ring Complex is aimed at investigating the subsurface structure of the ring complex whose three main rock types are arfvedsonite granite, biotite granite and syenite. Density determinations of the rock samples in the area gave values of 2.62 x 103 kg m3 for arfvedsonite granite, 2.58 x 10 kg m-3 for biotite granite- and 2.66 x 103 kg m-3 for syenite. A pear-shaped positive Bouguer anomaly striking S W was observed over the arfvedsonite granite and biotite granite which forms the northern part of the complex. While at the southern section, over the syenite, the Bouguer anomaly is predominantly negative with an E - W trend. The residual gravity anomalies of the northern and the southern sections are of amplitudes + 70 g.u. and - 80 g.u. respectively. These suggest that the northern section of the complex had been intruded at depth by a high density material possibly basalt, possibly after the formation of the complex. The subsurface structure of the Shira Younger Granite Ring Complex consists of three layers at depth. The rock type that is least exposed arfvedsonite granite is the most deeply seated, while the highly exposed, most dense-, syenitic massifs is the least in subsurface thickness and is else the uppermost layer. One of the profiles interpreted indicate that the syenitic massif extends from the ground surface to a depth of 1.0 km. This is underlain by the biotite granite mass whose thickness is 2.0 km. which is in turn underlain by the arfvedsonite granite body located at a depth of 2.5 km. to 4.0 km.en_US
dc.identifier.urihttp://hdl.handle.net/123456789/9068
dc.language.isoenen_US
dc.subjectGRAVITY SURVEY,en_US
dc.subjectSHIRA YOUNGER GRANITE- RING COMPLEX,en_US
dc.subjectNORTHERN NIGERIA,en_US
dc.titleGRAVITY SURVEY OF SHIRA YOUNGER GRANITE- RING COMPLEX OF NORTHERN NIGERIAen_US
dc.typeThesisen_US
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