TREND SURFACE ANALYSIS AND INTERPRETATION OF GRAVITY DATA FROM THE MIDDLE NIGER BASIN, NIGERIA

Simple item page
dc.contributor.authorLIKKASON, OTHNIEL KAMFANI
dc.date.accessioned2014-02-06T09:22:08Z
dc.date.available2014-02-06T09:22:08Z
dc.date.issued1991-03
dc.descriptionA THESIS SUBMITTED TO THE AHMADU BELLO UNIVERSITY I PARTIAL FULFILMENT FOR THE AWARD OF MASTER OF SCIENCE DEGREE IN APPLIED GEOPHYSICSen_US
dc.description.abstractA set of Bouguer gravity values from the Middle Niger (Nupe) Basin is fitted with polynomial surfaces of various degrees and these and the associated residuals are contoured. On the basis of close correlation of residuals from the fourth degree surface with geologic structures of the area, and the fact that the fourth degree corresponds with the point which is closest to the discontinuity on the plot of variances against degrees of polynomial surfaces, giving the optimum degree that fits the data (Zeng, 1989), it is concluded that this surface best represents the regional field of this area. A prominent long wavelength anomaly on this surface is interpreted to be an upper mantle plume 2-4km above an average Moho depth of 35km. The associated residuals from this surface show prominent positive anomalies of the order of 15mGals. A 3-dimensional computer interpretation attributes these anomalies to shallow sources as well as a high density metamorphic basement of schist or amphibolite composition. Basic and ultrabasic rocks are considered possible sources of the prominent residual Bouguer anomalies. The negative anomalies are attributed to Older Granite suites that predominate the area and to the thick Cretaceous sediments where such are considered significant. The contour patterns at the boundaries of the basin do not indicate faulting. This does not, however, rule out faulting at the contacts of the basin in view of the available evidence of major and minor faults indicated from Landsat imageries, drillingen_US
dc.identifier.urihttp://hdl.handle.net/123456789/375
dc.language.isoenen_US
dc.subjectTRENDen_US
dc.subjectSURFACEen_US
dc.subjectANALYSISen_US
dc.subjectINTERPRETATIONen_US
dc.subjectGRAVITYen_US
dc.subjectDATAen_US
dc.subjectMIDDLEen_US
dc.subjectNIGER BASINen_US
dc.subjectNIGERIAen_US
dc.titleTREND SURFACE ANALYSIS AND INTERPRETATION OF GRAVITY DATA FROM THE MIDDLE NIGER BASIN, NIGERIAen_US
dc.typeThesisen_US
Files
Original bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
TREND SURFACE ANALYSIS AND INTERPRETATION OF GRAVITY DATA FROM THE MIDDLE NIGER BASIN, NIGERIA.pdf
Size:
8.1 MB
Format:
Adobe Portable Document Format
Description:
Download
License bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
license.txt
Size:
1.58 KB
Format:
Item-specific license agreed upon to submission
Description:
Download
Collections
SCIENCE