Anisotropy of Magnetic Susceptibility and Magnetic Mineralogy Dataset from the Neogene Valdelsa Basin (Southern Tuscany, Italy)
Cite as:
Milaneschi, Lorenzo; Mattei, Massimo; Cornamusini, Gianluca; Foresi, Luca Maria; Martini, Ivan; Cifelli, Francesca (2025): Anisotropy of Magnetic Susceptibility and Magnetic Mineralogy Dataset from the Neogene Valdelsa Basin (Southern Tuscany, Italy). GFZ Data Services. https://doi.org/10.5880/fidgeo.2025.028
Status
I N R E V I E W : Milaneschi, Lorenzo; Mattei, Massimo; Cornamusini, Gianluca; Foresi, Luca Maria; Martini, Ivan; Cifelli, Francesca (2025): Anisotropy of Magnetic Susceptibility and Magnetic Mineralogy Dataset from the Neogene Valdelsa Basin (Southern Tuscany, Italy). GFZ Data Services. https://doi.org/10.5880/fidgeo.2025.028
Abstract
This paleomagnetic study investigated the magnetic fabric and magnetic mineralogy of samples collected in the neogenic Valdelsa Basin, (Southern Tuscany). The primary aims were to characterize deformation processes and the investigate magnetic mineralogy phases. The first phase involved fieldwork on selected sections in the central-eastern sector of the basin, focusing on mudstone and silty mudstone lithologies. Using a battery-powered portable drill with a water-cooled diamond bit, approximately 120 oriented samples were collected, and the cores were oriented in situ using a magnetic compass. The samples were analyzed in the Roma-Tre paleomagnetic laboratory using several methods. Anisotropy of magnetic susceptibility (AMS) was measured on all samples using a KLY-3 (Agico) to define magnetic fabric and bulk susceptibility. This non-destructive measurement provides insight into potential deformational processes. Magnetic mineralogy was investigated through isothermal remanent magnetization (IRM) and thermal demagnetization methods after applying different fields to the core axis through a pulse magnetizer. The remanent magnetization was measured using a JR6 spinner magnetometer whereas the results were interpreted using Remasoft and Anisoft software. The AMS and magnetic mineralogy datasets are available in .txt format.
This publication results from work conducted under the transnational access/national open access action at the Paleomagnetic Laboratory of Roma Tre University supported by WP3 ILGE - MEET project, PNRR - EU Next Generation Europe program, MUR grant number D53C22001400005.
Methods
The preliminary phase consisted in fieldwork activity on selected sections located in the central-eastern sector of the Valdelsa Basin (Southern Tuscany) where preferentially mudstone or silty mudstone have been sampled. About 120 oriented samples have been collected using a petrol-powered portable drill with a water-cooled diamond bit. The cores have been oriented in situ with a magnetic compass. Subsequently, samples have been analyzed in the Roma Tre paleomagnetic laboratory with several methods. The Anisotropy of Magnetic Susceptibility (AMS) has been measured in all the samples using a KLY-3 (Agico). Through this non-destructive measurement method, has been defined the magnetic fabric and the bulk susceptibility of the measured samples.
Symmetric tensors which represent the Anisotropy of Magnetic Susceptibility (AMS) have been projected with Anisoft software to investigate possible deformation processes of the studied deposits. Magnetic mineralogy has been analyzed on some samples for each section for paleomagnetic investigations. For the selected samples, Isothermal remanent magnetization (IRM) has been studied after the application of an increasing magnetic field along the z axis of the core. The applied fields are: 0, 10, 100, 200, 300, 400, 500, 700, 900, 1200, 1500, 2000 and 2700 mT through a pulse magnetizer. After each step the remnant magnetization has been measured through a JR6 spinner magnetometer. Magnetic mineralogy has been studied also with the thermal demagnetization methods after the application on the core axis of different fields through the pulse magnetizer: x = 0.12 T, y = 0.6 T, z = 2.0 T. The application of the three different fields induces the magnetic dipoles to orient on the basis of their low, medium and high coercivity to the short, medium or long axis. Samples have thermal demagnetization with steps of: 20, 120, 180, 250, 320, 360, 400, 480, 580, 630 and 670 °C. After each thermal step the remanent magnetization of the samples has been measured through a JR6 spinner magnetometer along the three axes. These data have been imported on Remasoft software for the interpretation of the magnetic mineralogy phases.
Authors
Milaneschi, Lorenzo;University of Siena, Department of Physical, Earth and Environmental Sciences, Siena, Italy
Mattei, Massimo;Roma TRE University, Department of Science, Rome, Italy
Cornamusini, Gianluca;University of Siena, Department of Physics, Earth and Environmental Sciences, Siena, Italy
Foresi, Luca Maria;University of Siena, Department of Physics, Earth and Environmental Sciences, Siena, Italy
Martini, Ivan;University of Siena, Department of Physics, Earth and Environmental Sciences, Siena, Italy
Cifelli, Francesca;Roma TRE University, Department of Science, Rome, Italy
Contact
Lorenzo Milaneschi
(PI); University of Siena, Department of Physical, Earth and Environmental Sciences, Siena, Italy;
Contributors
Paleomagnetic Laboratory (Università di Roma TRE, Italy); ILGE TNA/NOA; MEET Project (Monitoring Earth's Evolution and Tectonics); Lorenzo Milaneschi
Funders
European Commission:
MEET
Ministero dell'Università e della Ricerca:
MEET (D53C22001400005)
Keywords
EPOS, multi-scale laboratories, paleomagnetic and magnetic data, magnetic susceptibility data, Cyclostratigraphy, compound material > sedimentary material > organic rich sedimentary material > organic rich sediment, compound material > sedimentary material > sediment > mud size sediment > mud, compound material > sedimentary material > sediment > sand size sediment > sand, magnetic suzeptibility > anisotropy, remanent magnetisation > demagnetisation type AF, remanent magnetisation > demagnetisation type TH (thermal), Phanerozoic > Cenozoic > Neogene > Pliocene > Piacenzian, Sedimentary, Stratigraphic Section, Phanerozoic > Cenozoic > Neogene > Pliocene > Piacenzian, Sedimentary, Stratigraphic Section, compound material > sedimentary material > organic rich sedimentary material > organic rich sediment, compound material > sedimentary material > sediment > mud size sediment > mud, compound material > sedimentary material > sediment > sand size sediment > sand, magnetic suzeptibility > anisotropy, remanent magnetisation > demagnetisation type AF, remanent magnetisation > demagnetisation type TH (thermal)
affiliation: Roma TRE University, Department of Science, Rome, Italy
titles
title: Anisotropy of Magnetic Susceptibility and Magnetic Mineralogy Dataset from the Neogene Valdelsa Basin (Southern Tuscany, Italy)
publisher: GFZ Data Services
publicationYear: 2025
subjects
subject: EPOS
subject: multi-scale laboratories
subject: paleomagnetic and magnetic data
subject: magnetic susceptibility data
subject: Cyclostratigraphy
subject (subjectScheme=EPOS WP16 Paleomagnetic Data Lithology): compound material > sedimentary material > organic rich sedimentary material > organic rich sediment
subject (subjectScheme=EPOS WP16 Paleomagnetic Data Lithology): compound material > sedimentary material > sediment > mud size sediment > mud
subject (subjectScheme=EPOS WP16 Paleomagnetic Data Lithology): compound material > sedimentary material > sediment > sand size sediment > sand
subject (subjectScheme=EPOS WP16 Paleomagnetic Data Measurement Type): magnetic suzeptibility > anisotropy
CharacterString: This paleomagnetic study investigated the magnetic fabric and magnetic mineralogy of samples collected in the neogenic Valdelsa Basin, (Southern Tuscany). The primary aims were to characterize deformation processes and the investigate magnetic mineralogy phases. The first phase involved fieldwork on selected sections in the central-eastern sector of the basin, focusing on mudstone and silty mudstone lithologies. Using a battery-powered portable drill with a water-cooled diamond bit, approximately 120 oriented samples were collected, and the cores were oriented in situ using a magnetic compass. The samples were analyzed in the Roma-Tre paleomagnetic laboratory using several methods. Anisotropy of magnetic susceptibility (AMS) was measured on all samples using a KLY-3 (Agico) to define magnetic fabric and bulk susceptibility. This non-destructive measurement provides insight into potential deformational processes. Magnetic mineralogy was investigated through isothermal remanent magnetization (IRM) and thermal demagnetization methods after applying different fields to the core axis through a pulse magnetizer. The remanent magnetization was measured using a JR6 spinner magnetometer whereas the results were interpreted using Remasoft and Anisoft software. The AMS and magnetic mineralogy datasets are available in .txt format.
This publication results from work conducted under the transnational access/national open access action at the Paleomagnetic Laboratory of Roma Tre University supported by WP3 ILGE - MEET project, PNRR - EU Next Generation Europe program, MUR grant number D53C22001400005.
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CharacterString: The preliminary phase consisted in fieldwork activity on selected sections located in the central-eastern sector of the Valdelsa Basin (Southern Tuscany) where preferentially mudstone or silty mudstone have been sampled. About 120 oriented samples have been collected using a petrol-powered portable drill with a water-cooled diamond bit. The cores have been oriented in situ with a magnetic compass. Subsequently, samples have been analyzed in the Roma Tre paleomagnetic laboratory with several methods. The Anisotropy of Magnetic Susceptibility (AMS) has been measured in all the samples using a KLY-3 (Agico). Through this non-destructive measurement method, has been defined the magnetic fabric and the bulk susceptibility of the measured samples.
Symmetric tensors which represent the Anisotropy of Magnetic Susceptibility (AMS) have been projected with Anisoft software to investigate possible deformation processes of the studied deposits. Magnetic mineralogy has been analyzed on some samples for each section for paleomagnetic investigations. For the selected samples, Isothermal remanent magnetization (IRM) has been studied after the application of an increasing magnetic field along the z axis of the core. The applied fields are: 0, 10, 100, 200, 300, 400, 500, 700, 900, 1200, 1500, 2000 and 2700 mT through a pulse magnetizer. After each step the remnant magnetization has been measured through a JR6 spinner magnetometer. Magnetic mineralogy has been studied also with the thermal demagnetization methods after the application on the core axis of different fields through the pulse magnetizer: x = 0.12 T, y = 0.6 T, z = 2.0 T. The application of the three different fields induces the magnetic dipoles to orient on the basis of their low, medium and high coercivity to the short, medium or long axis. Samples have thermal demagnetization with steps of: 20, 120, 180, 250, 320, 360, 400, 480, 580, 630 and 670 °C. After each thermal step the remanent magnetization of the samples has been measured through a JR6 spinner magnetometer along the three axes. These data have been imported on Remasoft software for the interpretation of the magnetic mineralogy phases.
Released
Dataset
Abstract
;University of Siena, Department of Physical, Earth and Environmental Sciences, Siena, Italy
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