Geophysical contribution for the study of the Granitic Batholit Santa Helena, southwest of the Amazonian Craton

Authors

  • Vanessa Biondo Ribeiro 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

DOI:

https://doi.org/10.5327/Z1519-874X2012000200005

Keywords:

Gammaspectrometry, Aeromagnetics, Santa Helena Batholith

Abstract

The Santa Helena batholith is subject of many controversies concerning its geographical extension, lithological constitution, geochemical characterization and geotectonic setting. This paper aims to contribute for a better understanding of this intrusion using geophysical data (gammaspectrometric and aeromagnetic). These data were obtained through surveys contracted by the Geological Survey of Brazil (CPRM) flown over the study region. Given the compositional variety of the rocks, we analyzed the susceptibility contrast (magnetometry) and distribution of radioelements (K, Th and U, measured by gammaspectrometry) in the batholith. The resulting geophysical signature is different when comparing the northern and southern parts of the body, suggesting the presence of two distinct suites. The boundary between these two suites coincides with the location of an approximately N75°W oriented fault system that extends through the batholith.

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Published

2012-08-01

Issue

Vol. 12 No. 2 (2012)

Section

Articles

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How to Cite

Ribeiro, V. B., & Mantovani, M. S. M. (2012). Geophysical contribution for the study of the Granitic Batholit Santa Helena, southwest of the Amazonian Craton . Geologia USP. Série Científica, 12(2), 65-82. https://doi.org/10.5327/Z1519-874X2012000200005