Unbekannt
In:
Protokoll über das Kolloquium Elektromagnetische Tiefenforschung: 16. Kolloquium: Burg Ludwigstein, 9.4.-12.4.1996
Publikationsdatum:
2021-11-03
Beschreibung:
Analyses of magnetotelluric (Mn and magnetovariational (MV) data from 20 sites spanning southe~ Kenya has revealed significant three-dimensional effects. Consideration of both regional geology and induction arrow transfer functions implies the importance of two principal strike directions : One delineated by the N-S trending rift, the other controlled by a continental scale, Protorozoic , NW-SE striking , fault fabric. The hypothesis that the induction arrows might be explicable in terms of the near-surface expression of the conductive infill of the rift, together with a deep-seated , NW-SE striking conductor extending into the upper mantle is borne out by three-dimensional modelling . Spatially and directionally , the mantle conductor may correspond with a low velocity zone modelled from teleseismic data and both geophysical signatures may relate to a major, NW-SE striking shear zone system which has been mapped at the surface. A low velocity zone modelled from seismic refraction data recorded along a profile which crosses the rift at the same latitude as the MT measurements has been speculatively attributed to a few percent partial melt in the mantle directly below the rift. No support for this interpretation is provided by the MV data.
Sprache:
Englisch
Materialart:
info:eu-repo/semantics/conferenceObject
Format:
application/pdf
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