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GSA Bulletin; April 2001; v. 113; no. 4; p. 469-481; DOI: 10.1130/0016-7606(2001)113<0469:PAPOJR>2.0.CO;2
© 2001 Geological Society of America
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Paleomagnetism and paleogeography of Jurassic radiolarian cherts from the northern Apennines of Italy

I.W. Aiello*,1 and J.T. Hagstrum{dagger},2

1 Consiglio Nazionale delle Ricerche, Centro di Studio dell'Appennino e delle Catene Perimediterranee, Florence 50121, Italy
2 U.S. Geological Survey, Menlo Park, California 94025, USA

Oriented samples of Jurassic radiolarian chert were collected from the Tuscan domain (continental margin) and the Ligurid domain (oceanic) of the northern Apennines for paleomagnetic study to determine the paleogeographic origins of these rocks. The oceanic rocks are all thermochemically overprinted by a mostly reversed-polarity component of magnetization (B) that was likely acquired during late Miocene regional uplift of the northern Apennines. This component also dominates the lower brittle chert of the Tuscan Cherts, but disappears upsection in the more clay-rich and ductile siliceous marlstones. In addition, the Tuscan Cherts retain an inferred primary magnetization (C), isolated at temperatures between 560 and 660 °C, which passes a fold test and shows a polarity stratigraphy. This component indicates a paleolatitude of 11° ± 4°N, and a counterclockwise vertical-axis rotation of 29° ± 9° with respect to the southern Alps of Italy, of 49° ± 8° with respect to Africa, and of 91° ± 8° with respect to Eurasia. Our results suggest that the Tuscan domain was farther south than other deep-water continental margin sections of Adria, and that transcurrent faulting might have played a significant role in the orogenic evolution of the northern Apennines.

Key Words: Jurassic • northern Apennines • paleogeography • paleomagnetism • radiolarite • western Tethys






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