Remagnetization of Cretaceous forearc strata on Santa Margarita and Magdalena Islands, Baja California Sur: implications for northward transport along the California margin

Article Abstract:

A study reports that the interpretation of paleomagnetic data for Cretaceous forearc strata and coeval plutonic rocks in southern and Baja California indicates a northward displacement of this land area 10-15 degrees in latitude, relative to stable North America, during the late Cretaceous and early Tertiary periods. The rocks in these areas have been remagnetized and this remagnetization likely occurred during the late Cenozoic period. The study is discussed and its findings are summarized.

Case studies, Southern California, Baja California, Mexico (State), Continental drift, Paleomagnetism

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Frontal part of the northern Apennines fold and thrust belt in the Romagna-Marche area (Italy): Shallow and deep structural styles

Article Abstract:

The timing, structural styles and amount of deformation during late Miocene to Pleistocene times in the Marche-Romagna sector of the northern Apennines, have been studied. The timing of deformation shows typical diachroneity from the hinterland to the foreland of the thrust belt. Deformation onset is late Messinian, reaching the early Pleistocene in the offshore Adriatic Sea. Black thrusts characterize the regional deformation style.

Italy

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Comment on "shallow magnetic inclinations in the Cretaceous Valle Group, Baja California: remagnetization, compaction, or terrane translation"? By Douglas P. Smith and Cathy J. Busby

Article Abstract:

Theories by Douglas P. Smith and Cathy J. Busby on the negative correlations between compaction shallowing of paleomagnetic inclination and the nature of formation of Valle Group rocks seems flawed. Among other things, the finding that these paleomagnetic inclinations support northward terrane more than Neogene displacements is refuted to be a wrong interpretation of facts.

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