DETAILED GRAVITY STUDY OF THE DANGE ANOMALY IN SOKOTO STATE, NIGERIA

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dc.contributor.authorEgwuonwu, Gabriel Ndubuisi
dc.date.accessioned2014-02-04T10:03:42Z
dc.date.available2014-02-04T10:03:42Z
dc.date.issued2000-09
dc.descriptionA Thesis submitted to the Postgraduate School, Ahmadu Bello University, Zaria in partial fulfillment of the requirements for the degree of Master of Science, Applied Geophysicsen_US
dc.description.abstractA detailed gravity survey of the Dange area within the Sokoto Basin, Northwestern Nigeria has been carried out to determine the structure and probable mode of emplacement of the causative body of Dange aeromagnetic anomaly. One hundred and ninety five gravity stations were occupied at one kilometer interval using a LaCoste and Romberg Model G gravimeter for the relative gravity measurements and two Wallace and Tiernan Aneroid Altimeters for the elevation determination. Density measurements on one hundred and ninety six rock samples were carried out to aid the interpretation of the gravity data. The Bouguer gravity in the area is characterized by negative anomaly with relative values ranging in amplitude from -58mGal to -32mGal. The regional field is a plane dipping at about 10° northeastwards with a gradient of 0.38mGal per km. The residual anomaly map of the area is characterized by a prominent positive anomaly of +10mGal amplitude located at the southeastern portion of the survey area. This positive residual anomaly corresponds well in it's location with the prominent Dange aeromagnetic anomaly which earlier workers have attributed to an intra basement intrusion underlying the sediment in the region. A two and half-dimensional modeling of the residual anomaly suggests a body which is probably schistotic with depth extent of about 10.0km. It is located at a depth of about 2.0km with inward dipping contrasts ranging from 20° to 48° in the underlying basement. This body has probably resulted from a metamorphic process which is believed to have taken place during the middle Eocene uplift which gave rise to some synclinal structures and general irregularities of the basement surface in the area. viien_US
dc.identifier.urihttp://hdl.handle.net/123456789/144
dc.language.isoenen_US
dc.subjectDETAILEDen_US
dc.subjectGRAVITY STUDYen_US
dc.subjectDANGEen_US
dc.subjectANOMALYen_US
dc.subjectSOKOTO STATEen_US
dc.subjectNIGERIAen_US
dc.titleDETAILED GRAVITY STUDY OF THE DANGE ANOMALY IN SOKOTO STATE, NIGERIAen_US
dc.typeThesisen_US
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