Abstract
Abstract The Eower Cretaceous Maiolica formation was investigated in a regional paleomagnetic study in order to clarify the role of the Umbrian-Marches region in Western Mediterranean tectonics. This area has been considered as a semi-autonomous microplate by some authors and as an allochthonous overthrust block by others. Oroclinal bending has been inferred from earlier paleomagnetic results of the Scaglia formation. In spite of weak natural remanent magnetizations (NRM), stable characteristic remanent magnetization (ChRM) directions were defined for 31 sites. The site-mean directions are well-grouped ( D = 306°, I = 37°, α 95 = 5°) but are not uniform. Fisher statistics are therefore not applicable. The nonuniformity of directions is partially due to regional and local variations, but is not related to the orientation of the fold axes as suggested by several authors. It is possible that the Umbrian-Marches region has suffered thrust decollement on the underlying Triassic evaporites during the Late Tertiary orogeny, but this was not accompanied by large-scale translation or rotation relative to the assumed autochthonous parts of the Adriatic promontory.
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