Integration And Interpretation Of Geophysical Data In Central Southern Block Of Yemen

Geophysical Studies in Central Southern Block of Yemen (Al-Bayda, Mukeyras and Al-Fadahah areas), provides a description of the survey results and describes the equipment, procedures and logistics of the survey. The digital data included with this thesis display the magnetic and conductive properties of the survey area. The Area has defined several promising exploration targets in the Al-Bayda -Mukayras area. All are bedrock conductors and therefore possible massive metallic sulfides. The most attractive targets are concentrated in the Wadi Annah area; it is of low to intermediate grade metavolcanics and metasediments. A variety of other interesting targets are scattered over the rest of the survey area some have been interpreted as pyrrhotite, others may be formational conducts i.e. graphites or graphitic schists Many bedrock conductors have been interpreted from the survey data many are situated within extensive highly conductive zones which consist of closely-spaced bedrock sources. These conductors are most likely due to graphite rocks. There are several zones, however, in which anomalies seem to reflect discrete bedrock sources which display direct magnetic correlation and therefore indicate massive sulphides. The total field magnetic data have successfully mapped the structure and lithology of the survey area Interpretation sketch maps included with this thesis identify numerous faults and contacts which have been inferred from the magnetic data They also outline magnetic trends which may form a distinct geological unit. The resistivity products provide valuable information for general geological mapping purposes. Contacts, faults and conductive stratigraphic units are all apparent on the resistivity maps. Remote sensing imagery, which are the expression of faults and fractures affecting the Precambrian basement and have been corroborated by breaks in the airborne geophysics anomalies patterns.