STRUCTURAL AND THREE-DIMENSIONAL INTERPRETATION OF AEROMAGNETIC ANOMALIES OVER PART OF THE IGNEOUS INTRUSIONS OF KANO STATE, NORTH-CENTRAL NIGERIA

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dc.contributor.authorSULEIMAN, MUHAMMED ANKA
dc.date.accessioned2014-02-11T11:32:46Z
dc.date.available2014-02-11T11:32:46Z
dc.date.issued1998-07
dc.descriptionA THESIS SUBMITTED TO THE POST-GRADUATE SCHOOL AHMADU BELLO UNIVERSITY, ZARIA, IN PARTIAL FULFILMENT OF THE REQUIREMENTS FOR THE AWARD OF MASTER OF SCIENCE DEGREE IN APPLIED GEOPHYSICS.en_US
dc.description.abstractAn interpretation of aeromagnetic data has been carried out over an area of the Precambrian to early Palaeozoic basement rocks of Kano State, North-central Nigeria, between Latitudes 11°00'N to I2°00'N and Longitudes 8°00'E and 9°00'E. The interpretation covers the areas of igneous intrusions of the basement. Non-orientational and orientational studies of the lineament features reveal NE-SW and E-W trends characterizing the area. Statistical analysis using the analytical method of auto-covariance confirms this result. The residual and second derivative maps emphasize the shallow features of the area. These features correlate very well with the previous gravity investigation within the area. The regional field and upward continuation map reflect deep seated structures in the area and shows the regional structures field have an E-W trend. This studies show that the area is characterized by NE-SW residuals superimposed on an E-W treading regional field. Residual anomalies of both high and low amplitude are recognized on the residual map which are oriented along the interpreted shear zone. A 3-Dimension interpretational method has been used for the inversion of these anomalies. A preliminary spectral analysis reveals a shallow depth magnetic horizon of 0.45 to 0.65 km and a deeper layer with depth of 5.2 km to 6.8 km for the rock ensembles. The results obtained from the inversion method show that the depth to the tops of the modelled bodies vary from zero to 1.47 km and the depth to the bottom varying from 0.601 km to 8.628 km. With variation in the susceptibility contrast from -0.00120 emu. to +0.0833 emu. The positive susceptibilities are interpreted to be due to basic igneous intrusions, while the negative susceptibilities are due to acidic intrusions. Ien_US
dc.identifier.urihttp://hdl.handle.net/123456789/1212
dc.language.isoenen_US
dc.subjectSTRUCTURALen_US
dc.subjectTHREE-DIMENSIONALen_US
dc.subjectINTERPRETATIONen_US
dc.subjectAEROMAGNETICen_US
dc.subjectANOMALIESen_US
dc.subjectIGNEOUSen_US
dc.subjectINTRUSIONSen_US
dc.subjectKANOen_US
dc.subjectNORTH-CENTRALen_US
dc.subjectNIGERIAen_US
dc.titleSTRUCTURAL AND THREE-DIMENSIONAL INTERPRETATION OF AEROMAGNETIC ANOMALIES OVER PART OF THE IGNEOUS INTRUSIONS OF KANO STATE, NORTH-CENTRAL NIGERIAen_US
dc.typeThesisen_US
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