Abstract
When studying weakly anisotropic rocks non-standard relationships between magnetic and expected petrofabric axes are sometimes observed, in particular the so-called inverse or intermediate fabrics. A review of possible explanations for these effects is presented and leads to the conclusion that a majority of abnormal magnetic fabrics, often encountered in magnetite-rich volcanic rocks, are due to abnormal preferred orientations or distributions of magnetite grains. Through case studies in dikes (from Skye Island, Yemen and the Iberian Peninsula), and magma and ash flows (from the Ethiopian traps and southern Corsica) the various possible origins of such fabrics are examined. It is possible to retrieve reliable magma flow directions from these sites provided proper data selection is performed, leading to non-unique interpretations.
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