scholarly journals Anisotropies of anhysteretic remanence and magnetic susceptibility of marly clays from Central Italy

1994 ◽  
Vol 37 (5) ◽  
Author(s):  
A. Winkler ◽  
L. Sagnotti
Keyword(s):  
Magnetic Susceptibility ◽  
Empirical Investigation ◽  
Central Italy ◽  
Anisotropy Of Magnetic Susceptibility ◽  
Statistical Procedure ◽  
Laboratory Technique ◽  
Rock Fabric ◽  
Geological Processes ◽  
Strain Relationship ◽  
First Time

Marly clays from an Upper Pliocene unit at Valle Ricca (Rorne) were investigated for their Anisotropy of Anhysteretic Remanence (AAR) and Anisotropy of Magnetic Susceptibility (AMS). The study of AAR was accomplished for the first time in ltaly, developing a suitable laboratory technique and adapting a standard statistical procedure. The comparison between anhysteretic remanence and magnetic susceptibility anisotropies discriminates the fabric of the ferromagnetic fraction from that of the paramagnetic matrix of the rock. The separation of fabric components was applied to distinguish subsequent geological processes that affected the total rock fabric. The results indicate that the clayey units are particularly suitable for the empirical investigation of fabric to strain relationship in weakly deformed rocks.

scholarly journals Paleomagnetic and Anisotropy of Magnetic Susceptibility (AMS) analyses of the Plio-Pleistocene extensional Todi basin, Central Italy

1997 ◽  
Vol 40 (6) ◽  
Author(s):  
L. Alfonsi
Keyword(s):  
Magnetic Susceptibility ◽  
Central Italy ◽  
Vertical Axis ◽  
Anisotropy Of Magnetic Susceptibility ◽  
Central Apennines ◽  
Homogeneous Process ◽  
Lower Pleistocene ◽  
Tectonic Framework ◽  
Axis Rotation ◽  
Apennine Chain

In the last few years paleomagnetic investigations within the Apennine chain have revealed that the area is characterized by a complex pattern of deformation, not linkable to a simple and homogeneous process. In order to estimate the amount, sense and timing of vertical axis rotations within the Central Apennines, Neogene continental basins have been investigated for paleomagnetic studies. The paleomagnetic results obtained in the Plio-Pleistocene Todi basin showed that the Upper Pliocene-Lower Pleistocene evolution, associated with major dip-slip tectonics, has not involved vertical axis rotation since that time. The Anisotropy of Magnetic Susceptibility analysis (AMS), carried out on the same samples treated for paleomagnetic determination, revealed the presence of two groups of specimens characterized by different magnetic lineation directions. One direction trends NE-SW and is parallel to the orientation of the regional extension stress typical of the area. This direction is observed throughout the northern basin. The other, restricted to the southern basin, trends N-S and shows no links with the tectonic, hydrological-sedimentary conditions of the area. The results of the AMS analysis will be presented and discussed in the light of the rock magnetic results and the tectonic framework of the area.

scholarly journals The magnetic anisotropy of rocks: principles, techniques and geodynamic applications in the Italian peninsula

1997 ◽  
Vol 40 (3) ◽  
Author(s):  
A. Winkler ◽  
L. Alfonsi ◽  
F. Florindo ◽  
L. Sagnotti ◽  
F. Speranza
Keyword(s):  
Magnetic Susceptibility ◽  
Magnetic Anisotropy ◽  
Sedimentary Rocks ◽  
Anisotropy Of Magnetic Susceptibility ◽  
Magnetic Fabric ◽  
Experimental Techniques ◽  
Rock Fabric ◽  
Italian Peninsula ◽  
Physical Principles

Magnetic anisotropy studies have recently come to the forefront as accurate, fast and inexpensive methods in the investigation of the rock fabric. In this paper we summarize the physical principles and the experimental techniques commonly used to resolve the Anisotropy of Magnetic Susceptibility (AMS) and the Anisotropy of Anhysteretic Remanence (AAR) tensors, and we give a description of the parameters which usually describe the magnetic anisotropy properties of a rock. A synthetic review of the magnetic fabric studies carried out on sedimentary rocks of the Italian peninsula is also given, discussing the potentiality of this technique in geodynamic studies.

Variations in magnetic properties of Mexican serpentinites and related micro-textures 

2021 ◽  
Author(s):  
Sandra B. Ramírez-García ◽  
Luis M. Alva-Valdivia
Keyword(s):  
Grain Size ◽  
Magnetic Properties ◽  
Magnetic Susceptibility ◽  
Anisotropy Of Magnetic Susceptibility ◽  
Ultramafic Rocks ◽  
Magnetic Carrier ◽  
Temperature Dependent ◽  
Geochemical Studies ◽  
The Relationship ◽  
Magnetite Formation

<p>Magnetite formation of serpentinized ultramafic rocks leads to variations in the magnetic properties of serpentinites; however, magnetite precipitation is still on debate.</p><p>In this work, we analyzed 60 cores of ultramafic rocks with a variety of serpentinization degrees. These rocks belong to the ultramafic-mafic San Juan de Otates complex in Guanajuato, Mexico. Geochemical studies have been previously conducted, enabling us to compare changes in the magnetic properties against the chemical variations generated by the serpentinization process. By studying the density and magnetic properties such as anisotropy of magnetic susceptibility, hysteresis curves as well as magnetic and temperature-dependent susceptibility and, we were able to identify the relationship between magnetic content and serpentinization degree, the predominant magnetic carrier, and to what extent the magnetite grain size depends on the serpentinization.  Variations in these parameters allowed us to better constrain the temperature at which serpentinization occurred, the generation of other Fe-rich phases such as Fe-brucite and/or Fe-rich serpentine as well as distinctive rock textures formed at different serpentinization degrees.</p>

Anisotropy of magnetic susceptibility of rocks and minerals

1963 ◽  
Vol 68 (1) ◽  
pp. 279-291 ◽  
Author(s):  
S. Uyeda ◽  
M. D. Fuller ◽  
J. C. Belshé ◽  
R. W. Girdler
Keyword(s):  
Magnetic Susceptibility ◽  
Anisotropy Of Magnetic Susceptibility

On the influence of magnetic mineralogy in the tectonic interpretation of anisotropy of magnetic susceptibility in cataclastic fault zones

2018 ◽  
Vol 216 (2) ◽  
pp. 1043-1061 ◽  
Author(s):  
Teresa Román-Berdiel ◽  
Antonio M Casas-Sainz ◽  
Belén Oliva-Urcia ◽  
Pablo Calvín ◽  
Juan José Villalaín
Keyword(s):  
Magnetic Susceptibility ◽  
Anisotropy Of Magnetic Susceptibility ◽  
Fault Zones ◽  
Magnetic Mineralogy ◽  
Tectonic Interpretation

scholarly journals Alyssum desertorum Stapf (Brassicaceae), new for the Italian flora

2016 ◽  
Vol 75 (1) ◽  
pp. 149-152 ◽  
Author(s):  
Fabrizio Bartolucci ◽  
Fabio Conti
Keyword(s):  
National Park ◽  
Central Italy ◽  
The Other ◽  
Italian Flora ◽  
Surrounding Areas ◽  
First Time

Abstract The occurrence of Alyssum desertorum, a species belonging to A. sect. Alyssum, is reported for the first time in Italy. It was found in Abruzzo (central Italy) in the territory of National Park of Gran Sasso and Laga mountains and surrounding areas. Morphological similarities with the other taxa recorded in Italy belonging to A. sect. Alyssum are briefly discussed. Information about the typification of the name, habitat, phenology and distribution in Italy are also provided.

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