A Gravity Survey Of the Older Granite Plutons In Katabu Area of Kaduna State

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dc.contributor.authorANASIUDU, EMEKA FIDELIS
dc.date.accessioned2014-02-19T09:14:45Z
dc.date.available2014-02-19T09:14:45Z
dc.date.issued1994-04
dc.descriptionA THESIS SUBMITTED TO THE POST GRADUATE SCHOOL AHMADU BELLO UNIVERSITY, ZARIA IN PARTIAL FULFILMENT OF THE REQUIREMENTS FOR THE DEGREE OF MASTER OF SCIENCE, APPLIED GEOPHYSICS DEPARTMENT OF PHYSICS FACULTY OF SCIENCE AHMADU BELLO UNIVERSITY ZARIA, NIGERIA.en_US
dc.description.abstractA gravity survey of the Precambrian Older Granite intrusions in Katabu area of Kaduna state, northern Nigeria has been carried out to determine the structure and probable mode of emplacement of the suite. A total of 153 stations were established at intervals of one to two kilometers using a LaCoste and Romberg gravity meter for relative gravity measurements and two altimeters for elavation determinations. Laboratory measurements were carried out on 81 rock samples collected from the area. Interpretation of the Bouguer anomaly field shows that the area is characterized by prominent residual anomalies of -8 to +6mGal amplitude relative to a N-S trending regional anomaly with an E-W gradient of the order of 0.4 mGal/km. Negative residual anomalies correlate well with granite bodies while positive anomalies are associated with quartz diorites and schists in the area. Two-dimensional modelling of the residual anomalies reveals that the thicknesses of the quartz diorites and granite bodies vary from 2 to 5km and 2 to 7km respectively. It is estimated that the schists in the area have thicknesses of the order of 1 km. The general configuration of the modelled bodies and the pattern of the gravity anomalies suggest that the Older Granites make sharp contact with the country rocks and were magmatically emplaced into the Basement Complex. The Bouguer anomalies observed over the schists have a maximum of only -52mGal. These values are considered too low to allow for the existence of more mafic rocks at depth and the schists in Katabu area are therefore believed to have evolved in an ensialic environment.en_US
dc.identifier.urihttp://hdl.handle.net/123456789/2052
dc.language.isoenen_US
dc.subjectGravity,en_US
dc.subjectSurvey,en_US
dc.subjectOlder,en_US
dc.subjectGranite,en_US
dc.subjectPlutons,en_US
dc.subjectKatabuen_US
dc.subjectKADUNA STATE,en_US
dc.titleA Gravity Survey Of the Older Granite Plutons In Katabu Area of Kaduna Stateen_US
dc.typeThesisen_US
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