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Paleomagnetic investigations imply rotations within the cretaceous-tertiary transition section at Cerbara (Italy)
Institution:1. School of Geophysics and Information Technology, China University of Geosciences, Beijing 100083, China;2. National Engineering Research Center of Offshore Oil and Gas Exploration, Beijing 100028, China;3. School of Ocean Sciences, China University of Geosciences, Beijing 100083, China;4. State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Beijing 100083, China;1. Post-Graduate Program in Geology, Universidade do Vale do Rio dos Sinos - Unisinos University, São Leopoldo, Rio Grande do Sul, Brazil;2. ITT Oceaneon – Instituto Tecnológico de Paleoceanografia e Mudanças Climáticas, Unisinos University, São Leopoldo, Rio Grande do Sul, Brazil;3. School of Geography, Earth and Environmental Sciences, Birmingham University, Birmingham, UK;4. Instituto Dom Luiz and Faculty of Sciences, University of Lisbon, 1749-016 Lisbon, Portugal;1. Exploration Department, Egyptian Petroleum Research Institute, Nasr City 11727, Egypt;2. State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences (Beijing), Beijing 100083, China;3. Geology Department, Faculty of Science, South Valley University, 83523 Qena, Egypt;4. Egyptian General Petroleum Corporation, Egypt;5. Geology and Geophysics Department, College of Science, King Saud University, Saudi Arabia;6. Institute of Geological Sciences, Oeschger Centre for Climate Change Research, University of Bern, 3012 Bern, Switzerland;7. Geology Department, Faculty of Science, Menoufia University, Shebin El-Kom 32511, Egypt
Abstract:A combination of magnetostratigraphic studies and magnetic fabric investigations in the Cretaceous-Tertiary transition section at Cerbara in the Umbrian Apennine (Italy) produced consistent results indicating local tectonic movements affecting the orientation of characteristic remanent magnetization as well as the magnetic fabric. The comparison of the data shows that a simple tilt correction is not sufficient to adjust the characteristic remanence directions. There remains a scatter in the declination that can be reduced by means of additional corrections by taking into account further local tectonic movements that affected the section. Different models are presented where anisotropy of magnetic susceptibility was used as a tool to correct for tectonic complications.
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