Lineament analysis in mineral exploration: application to southeastern São Paulo

Authors

  • Paulo Cesar Pressinotti Instituto de Pesquisas Tecnologicas do Estado de São Paulo S/A
  • Yociteru Hasui Universidade Estadual Paulista; Instituto de Geociências e Ciências Exatas
  • Rubens Borges da Silva Instituto de Pesquisas Tecnologicas do Estado de São Paulo S/A
  • Fausto Luís Stefani Instituto de Pesquisas Tecnologicas do Estado de São Paulo S/A
  • Maurício Trindade Instituto de Pesquisas Tecnologicas do Estado de São Paulo S/A
  • Mario Otávio Costa Instituto de Pesquisas Tecnologicas do Estado de São Paulo S/A

DOI:

https://doi.org/10.5935/0100-929X.19920007

Abstract

This paper deals with a satelite and radar imagery analysis, covering the southeastern region of the state of São Paulo, Brasil, aiming to select target areas, potentially favorable to host Sn and W mineralizations, spatially and genetically related to acid plutonism. These mineralizations are known to be strongly associated with fracturing (lato sensu); therefore an image analysis focusing on lineaments was done to characterize: 1) intensely fractured areas; 2) areas showing fracture patterns whith azimuths distinct from the regional one; and 3) systems of aligned fractures, of regional occurrence. The results were integrated with geological and geophysical data, allowing the selection of several target-areas, which were subject to geological and geochemical surveys. New non-foliated, discordant, intrusive granitic bodies were discovered; metassomatic alteration products (greisens) associated with them were identified along intensely fractured areas. The study suggests, for the southeastern region of the state of São Paulo, a model of linear discontinuities reactivated during thermo-tectonic instability periods.

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Published

1992-12-01

Issue

Vol. 13 No. 2 (1992)

Section

RIG050

License

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