Electromagnetic imaging of a transpressional tectonics in SW Iberia

Details Electromagnetic imaging of a transpressional tectonics in SW Iberia Electromagnetic imaging of a transpressional tectonics in SW Iberia

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.

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