Use of the ellipsoid of variographic anisotropy as a kinematic indicator in rock massifs fractured by faults: the example of the cana brava chrysotile asbestos deposit (Minaçu, GO)

Authors

  • Carlos Eduardo dos Santos Universidade Federal do Paraná; Departamento de Geologia
  • João Carlos Biondi Universidade Federal do Paraná; Departamento de Geologia

DOI:

https://doi.org/10.5327/Z1519-874X2011000300004

Keywords:

Ellipsoid of anisotropy, Kinematic indicator, Chrysotile deposit, Cana Brava

Abstract

The parameters of a variogram depend on which direction it is calculated, such as the ellipsoid of variographic anisotropy, whose axes indicate the directions of higher, medium and lower continuity of the variable used to calculate the variogram. Consequently, the ellipsoid can be used as a kinematic indicator, since the anisotropy ellipsoids of blocks of the same rock massif or mineralized body will be rotated if the blocks are also rotated. The chrysotile ore body of the Cana Brava Asbestos deposit is composed of 13 blocks separated by faults. Comparing the ellipsoids of variographic anisotropy of the variable amount of chrysotile in these 13 blocks, it was observed that, although they are displaced in relation to each other, in most cases this displacement was not caused by rotation. As a result, it was possible to group some blocks together and use only six ellipsoids and their respective variograms to estimate the amount of chrysotile in the deposit.

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Published

2011-12-01

Issue

Vol. 11 No. 3 (2011)

Section

Articles

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How to Cite

Santos, C. E. dos, & Biondi, J. C. (2011). Use of the ellipsoid of variographic anisotropy as a kinematic indicator in rock massifs fractured by faults: the example of the cana brava chrysotile asbestos deposit (Minaçu, GO) . Geologia USP. Série Científica, 11(3), 65-77. https://doi.org/10.5327/Z1519-874X2011000300004