THE APPLICATIONS OF MAGNETIC METHOD IN ARCHAEOLOGICAL INVESTIGATIONS OF LEJJA PREHISTORIC SITE IN ENUGU STATE, SOUTH- EASTERN NIGERIA

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dc.contributor.authorOGAH, AREWA JAMES
dc.date.accessioned2014-02-17T10:15:53Z
dc.date.available2014-02-17T10:15:53Z
dc.date.issued2013-01
dc.descriptionDissertation submitted to the School of Post Graduate Studies, Ahmadu Bello University, Zaria In partial fulfillment of the requirements for the Award of Degree of Doctor of Philosophy in Applied Geophysics Department of Physics, Faculty of Science Ahmadu Bello University, Zaria, Nigeria January, 2013en_US
dc.description.abstractThe search for historic evidence in Lejja has been conducted using data acquired from sites measuring 2,160m2, 2,030m2 and 2,400m2 in Uwani, Ugbelenabo and Ejuona villages respectively. The total magnetic field data and the vertical gradient of the total field data were acquired simultaneously on a regular 1 m x 1 m grid using proton precession magnetometer (Geometrics model G-856AX). The measured fields were stored in the machine’s internal memory and directly downloaded into a digital computer thereby avoiding transcription errors. The total field data were reduced using polynomial fitting method for diurnal correction while regional-residual separation was done using the golden software, surfer. This method of diurnal correction is one out of the two modifications made (in the course of this study) to the existing method of land magnetic data reduction. Integrated method of interpretation was deployed using Euler deconvolution and analytic signal methods which were validated using synthetic fields. The synthetic data were generated using Rao and Babu Algorithm. Both methods of interpretation gave error margin of about ±5% with the synthetic data. Analysis of the field data from the three sites revealed that some of the artefacts still remain in situ while others have been displaced as revealed by the orientations of their anomalies. The artefacts which include furnaces, slag blocks, blooms, tuyères, fired pits, etc., are mostly found in Ejuona and Uwani villages located in south-eastern and the central parts of the community respectively. Two types of smelting furnace are suspected. These include a small type with diameter of about 1.0 metre or less mapped in Uwani, and a large one with diameter between 1.2 and 1.5 metres also mapped in Ejuona. A large mound of an estimated area of about 70 m2 has also been mapped in Ejuona village. The spatial locations of the above ancient relics at the three sites have been obtained. A few of the relics including fired pits and fired stones suspected at the Ugbelenabo village can be found at shallow depths of between 0.62 m and 0.86 m. On the other hand, the depth of burial of the artefacts at Uwani and Ejuona villages are relatively greater than those of Ugbelenabo. The ranges are from 1.07 m to 2.09 m, and from 1.08 m to 1.82 m in Uwani and Ejuona villages respectively. Due to small sizes of the survey sites, longitude-latitude coordinates of only the origin of each site has been indicated with surface locations of the artefacts measured from this point. Excavation plans which can serve as bases for further studies have been drawn up for the three locations surveyed. It is expected that successful execution of the latter will serve as an encouragement for the practice of archaeological geophysics in the Lejja site and beyond. In addition to the polynomial fitting method mentioned earlier, single step approach of magnetic data reduction tagged, “Automatic Reduction of Magnetic Data (ARMAD)”, was also introduced in the course of this study. The latter method bypasses the conventional multi-stage method of magnetic data reductionen_US
dc.identifier.urihttp://hdl.handle.net/123456789/1695
dc.language.isoenen_US
dc.subjectAPPLICATIONS,en_US
dc.subjectMAGNETIC,en_US
dc.subjectMETHOD,en_US
dc.subjectARCHAEOLOGICAL,en_US
dc.subjectINVESTIGATIONS,en_US
dc.subjectLEJJA PREHISTORIC SITE,en_US
dc.subjectENUGU STATE,,en_US
dc.subjectSOUTH- EASTERN NIGERIAen_US
dc.titleTHE APPLICATIONS OF MAGNETIC METHOD IN ARCHAEOLOGICAL INVESTIGATIONS OF LEJJA PREHISTORIC SITE IN ENUGU STATE, SOUTH- EASTERN NIGERIAen_US
dc.typeThesisen_US
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