Electrical conductivity and crustal deformation from magnetotelluric results in the region of the Araguainha impact, Brazil

Details Electrical conductivity and crustal deformation from magnetotelluric results in the region of the Araguainha impact, Brazil Electrical conductivity and crustal deformation from magnetotelluric results in the region of the Araguainha impact, Brazil

May 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997pepi..101..271m&link_type=abstract

Physics of the Earth and Planetary Interiors, v. 101, p. 271-289.

Physics

4

Scientific paper

In order to obtain information about the deep structure of large meteorite craters, a series of MT soundings were carried out in the region of the Araguainha impact crater, located in the northern section of the Paraná Basin (Mato Grosso, Brazil). The MT responses in the short period range from 0.001 to 1 s show one-dimensional behaviour, in contrast to the longer periods where data are multi-dimensional. At periods between 1 and 10 s the splitting of the apparent resistivity and phase curves of different polarisations is accompanied by a strong increase of the phase-sensitive regional skew parameter to values up to 0.5. The results of two- and three-dimensional modelling reveal a disk-shaped body embedded within a layer of 5000 Ωm. The resistivity of the body, ranging between 20 Ωm and 500 Ωm, lies significantly below the bulk value of the upper crust. The anomaly is believed to be caused by impact-induced faulting and brecciation of the crust, reaching to depths of 3 to 7 km. The horizontal extent of this zone is 16 km, corresponding to about 40% of the total crater diameter at the surface. The long-period data (T < 10 s) reveal a heterogeneous lower crust of enhanced conductivity at depths between 15 and 30 km, which is not related to the impact event. It is likely to be a feature typical of the basement in the area of the Araguainha structure.

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