Estudo magnotelúrico na caracterização geotectônica do núcleo arqueano campo grande-rn, nordeste do brasil.

Abstract

This work consists of a magnetotelluric geophysical investigation of the large structures present in the Rio Grande do Norte Tectonic Domain, located in the Northeast region of Brazil, funded by the National Institute of Science and Technology – Geotectonics (INCT-Geotec). The main objectives are: to perform geoelectric modeling using magnetotelluric data, identify subsurface rock bodies and structures based on the obtained model, and integrate geophysical data with geological data. The methodology employed in this study included the following steps: a) literature review; b) acquisition of magnetotelluric (MT) data; c) filtering and removal of electromagnetic noise; d) calculation of the impedance tensor; e) inversion and obtaining the final model using the ModEM3D code. The study identified three main electrical features: “R1”, “C1”, and “C3”, which were associated with a migmatitic gneiss complex, amphibolites, and amphibolitic gneisses, respectively. Additionally, this study demonstrated the response of rocks to the dextral action of shear zones present in the region.