Abstract
<p>The Roveto Valley is a narrow, elongated, NW-trending depression filled with continental Plio-Quaternary deposits that outcrop at different topographic elevations. A morpho-lithostratigraphic succession of the continental deposits has been defined in order to reconstruct the geological Quaternary evolution of the area. These deposits do not contain materials suitable for biostratigraphic dating; therefore, in order to determine their chronology, three different units were sampled for magnetostratigraphic investigations. Paleomagnetic results demonstrated that standard demagnetization techniques are effective in removing secondary remanence components and in isolating the characteristic remanent magnetization, allowing us to determine, for each cycle, whether it was deposited before or after the Brunhes-Matuyama geomagnetic reversal at 781 ka. Preliminary rock magnetic analyses indicated that magnetite is the main magnetic carrier and that hematite, which gives the pink colour to the matrix, is in the superparamagnetic grain-size range and thus does not retain any paleomagnetic remanence.</p>
Highlights
The Roveto Valley area is part of a segment of the Apennine mountain range, which was intensively deformed by Neogene-Quaternary compressional and extensional tectonics [Saroli et al 2003 and references therein, Saroli and Moro 2012]. This sector of the chain was mostly formed during the Neogene, in the context of the eastward piggy-back propagation of the Apennines thrust system
Cycles 1, 2, and 3 of the identified morpho-lithostratigraphic succession were sampled and 4 thin sections were analyzed with an electron microprobe model Cameca SX-50 equipped with 5 WDS spectrometers and an energy dispersive spectrometer (EDS)
50% of the samples were stepwise alternating-field (AF) demagnetized and the remaining samples were subjected to stepwise thermal demagnetization, from room temperature up to 650°C
Summary
The Roveto Valley area is part of a segment of the Apennine mountain range, which was intensively deformed by Neogene-Quaternary compressional and extensional tectonics [Saroli et al 2003 and references therein, Saroli and Moro 2012]. This sector of the chain was mostly formed during the Neogene, in the context of the eastward piggy-back propagation of the Apennines thrust system. A better assessment of the geological Quaternary evolution of the Campoli Appennino sector has been achieved by the integration of paleomagnetic data with stratigraphic, morphological, and tectonic features [Messina et al 2001]
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