A gravity profile across the banke ring complex, Nigeria
1974; Elsevier BV; Volume: 12; Issue: 1 Linguagem: Inglês
10.1016/0016-7142(74)90007-6
ISSN1878-6022
Autores Tópico(s)Geomagnetism and Paleomagnetism Studies
ResumoThe results of gravity measurements across the Banke ring complex indicate that a local negative gravity anomaly is associated with the complex. Supporting evidence for the association is provided by density determinations which indicate that the rocks of the ring complex are lighter than those of the surrounding basement complex. The anomaly can be explained if the main biotite-granite pluton of the ring complex extends in a southeasterly direction to a distance of some 5 km beyond the marginal ring-dyke, beneath a thin basement cover. It appears, therefore, that the surface structure of the Banke ring complex differs considerably from its structure at depth. In view of the association of such minerals as cassiterite and wolframite with the biotite-granites of the Nigerian Younger Granite Province, the area overlying the postulated extension of the Banke granite is suggested as a possible target for the exploration of these minerals.
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