Resultados geofísicos integrados de um corpo com geometria 3D sem manifestação superficial

Authors

  • André Rugenski Universidade de São Paulo; Instituto de Astronomia, Geofísica e Ciências Atmosféricas
  • Marta Silvia Maria Mantovani Universidade de São Paulo; Instituto de Astronomia, Geofísica e Ciências Atmosféricas
  • Liliana Alcatraz Diogo Universidade de São Paulo; Instituto de Astronomia, Geofísica e Ciências Atmosféricas
  • Wladimir Shukowsky Universidade de São Paulo; Instituto de Astronomia, Geofísica e Ciências Atmosféricas

DOI:

https://doi.org/10.5327/S1519-874X2005000100004

Keywords:

alkaline magmatism, Registro - SP, geophysical surveys

Abstract

Airborne geophysical data of the SP-RJ survey carried out by the Brazilian Geological Survey (CPRM) reveal a magnetic anomaly without geological expression at the surface. The anomalous features are similar to those associated with alkaline complexes that outcrop in the same region. The absence of surface elements motivated the use of different geophysical methods to characterize the magnetic anomaly source. Among these methods, satellite images for different spectral bands were used, seismic sounding, gravity and ground magnetic surveys along a profile crossing the anomaly were performed, and density and susceptibility measurements of different rock types in the area were made. The obtained results were used to constrain 2½D simultaneous gravity and magnetic modeling and 3D airborne magnetic modeling. Both results indicate the presence of a body of about 3.3 x 10(9) metric tons, having its top at 40 meters from the surface and extending to a maximum depth of 1 km.

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Published

2005-06-01

Issue

Vol. 5 No. 1 (2005)

Section

Articles

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How to Cite

Rugenski, A., Mantovani, M. S. M., Diogo, L. A., & Shukowsky, W. (2005). Resultados geofísicos integrados de um corpo com geometria 3D sem manifestação superficial . Geologia USP. Série Científica, 5(1), 41-56. https://doi.org/10.5327/S1519-874X2005000100004