Physics – Geophysics
Scientific paper
Feb 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28..439a&link_type=abstract
Geophysical Research Letters, Volume 28, Issue 3, p. 439-442
Physics
Geophysics
15
Exploration Geophysics: Continental Structures, Exploration Geophysics: Magnetic And Electrical Methods
Scientific paper
Forty-one magnetotelluric sounding were carried out along a 200 km-long profile (approximately NNE-SSW) across the three major geotectonic units in SW Iberia. A model obtained from two-dimensional inversion of the magnetotelluric data set reveals high conductivity zones in the middle-lower crust (10-30 km). Two of these zones correspond to the transition between the main geotectonic units: one between the South Portuguese Zone and the Ossa Morena Zone, interpreted as having been caused by metasediments, and the other between the Ossa Morena Zone and the Central Iberia Zone associated with a shear zone and metasediments. Another high conductivity anomaly related to black shales with major graphite impregnation was detected within the Ossa Morena Zone. The resistive features, located preferentially in the upper crust (1-10 km), coincide with gabbroic and granitic complexes.
Almeida Eugénio
Fonseca Paulo
Marcuello Alex
Mendes-Victor Luis
Nolasco Rita
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