Abstract
It is largely recognized that heating enhances magnetic signal and that this is probably due to crystallization in a pre-existing petrofabric. This paper presents an example where heating not only enhances the magnetic fabric, but reveals a primary tectonic fabric overprinted by a late crystallization. We focus on a site of red Paleocene silts from the Lagrasse area (Aude, France), which exhibits, in two superimposed beds, primary (due to layer parallel shortening) and secondary (due to late crystallization) fabrics. Partial anisotropy of anhysteretic remanent magnetization and magnetic mineralogy investigations led us to consider that heating allows the growth of oxides, enhancing a cryptic pre-existing fabric.
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