Resumo

RAMIREZ L., JACKELINE; SIERRA, GLORIA M.  e  MARIN C., MARÍA I.. ANISOTROPY OF MAGNETIC SUSCEPTIBILITY (AMS), UPPER MEMBER OF AMAGÁ FORMATION, SECTION STREAM SABALETICAS, SW ANTIOQUEÑO AND ITS RELATION WITH THE MOVEMENTS WITH THE ROMERAL FAULT SYSTEMA DURING THE LATE CENOZOIC. Bol. cienc. tierra [online]. 2012, n.32, pp.125-142. ISSN 0120-3630.

The anisotropy of magnetic susceptibility (AMS) is an usefull tool to determine the magnetic fabric and their deformation in sedimentary rocks. The AMS can be expressed mathematically as second order tensors and geometrically as ellipsoids with K₁, K₂, K₃ axes, which represent the maximun, medium and minimun axes respectively. The relationships between the axes determine the ASM parameters which in turn indicate the elipsoid shapes. The ASM results obteined in the Sabaleticas stream section in the SW of Antioquia, may indicate at least two deformational events in the Upper member of the Amagá Formation. These deformations are in coherent with those reported by other authors along the Cauca-Romeral fault system. In a global point of view, the ASM results are related with the activity of Romeral system along the Piedecuesta fault, during the late Cenozoic.

Palavras-chave : Anisotropy of magnetic susceptibility; anisotropic parameters; Amagá Formation; magnetic fabric.

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