Application of anisotropy of magnetic susceptibility (AMS) fabrics to determine the kinematics of active tectonics: examples from the Betic Cordillera, Spain, and the Northern Apennines, Italy
<p>The anisotropy of magnetic susceptibility (AMS) technique provides an effective way to measure fabrics and, in the process, interpret the kinematics of actively deforming orogens. We collected rock fabric data of alluvial fan sediments surrounding the Sierra Nevada massif, Spain, and a broa...
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2021-05-01
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| Series: | Solid Earth |
| Online Access: | https://se.copernicus.org/articles/12/1125/2021/se-12-1125-2021.pdf |
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| author | D. J. Anastasio F. J. Pazzaglia J. M. Parés K. P. Kodama C. Berti J. A. Fisher A. Montanari L. K. Carnes |
| author_facet | D. J. Anastasio F. J. Pazzaglia J. M. Parés K. P. Kodama C. Berti J. A. Fisher A. Montanari L. K. Carnes |
| author_sort | D. J. Anastasio |
| collection | DOAJ |
| description | <p>The anisotropy of magnetic susceptibility (AMS) technique provides
an effective way to measure fabrics and, in the process, interpret the
kinematics of actively deforming orogens. We collected rock fabric data of
alluvial fan sediments surrounding the Sierra Nevada massif, Spain, and a
broader range of Cenozoic sediments and rocks across the Northern Apennine
foreland, Italy, to explore the deformation fabrics that contribute to the
ongoing discussions of orogenic kinematics. The Sierra Nevada is a regional
massif in the hinterland of the Betic Cordillera. We recovered nearly
identical kinematics regardless of specimen magnetic mineralogy, structural
position, crustal depth, or time. The principal elongation axes are NE–SW in
agreement with mineral lineations, regional GPS geodesy, and seismicity
results. The axes trends are consistent with the convergence history of the
Africa–Eurasia plate boundary. In Italy, we measured AMS fabrics of
specimens collected along a NE–SW corridor spanning the transition from
crustal shortening to extension in the Northern Apennines. Samples have AMS
fabrics compatible only with shortening in the Apennine wedge and have
locked in penetrative contractional fabrics, even for those samples that
were translated into the actively extending domain. In both regions, we found
that specimens have a low degree of anisotropy and oblate susceptibility
ellipsoids that are consistent with tectonic deformation superposed on
compaction fabrics. Collectively, these studies demonstrate the novel ways
that AMS can be combined with structural, seismic, and GPS geodetic data to
resolve orogenic kinematics in space and time.</p> |
| first_indexed | 2024-12-21T17:02:23Z |
| format | Article |
| id | doaj.art-ef03382889a644fa9d70e1058111e863 |
| institution | Directory Open Access Journal |
| issn | 1869-9510 1869-9529 |
| language | English |
| last_indexed | 2024-12-21T17:02:23Z |
| publishDate | 2021-05-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Solid Earth |
| spelling | doaj.art-ef03382889a644fa9d70e1058111e8632022-12-21T18:56:37ZengCopernicus PublicationsSolid Earth1869-95101869-95292021-05-01121125114210.5194/se-12-1125-2021Application of anisotropy of magnetic susceptibility (AMS) fabrics to determine the kinematics of active tectonics: examples from the Betic Cordillera, Spain, and the Northern Apennines, ItalyD. J. Anastasio0F. J. Pazzaglia1J. M. Parés2K. P. Kodama3C. Berti4J. A. Fisher5A. Montanari6L. K. Carnes7Department of Earth and Environmental Sciences, Lehigh University, Bethlehem, PA 18015, USADepartment of Earth and Environmental Sciences, Lehigh University, Bethlehem, PA 18015, USAGeochronology, Centro Nacional de Investigación de la Evolución Humana (CENIEH) Burgos, Burgos, 09002, SpainDepartment of Earth and Environmental Sciences, Lehigh University, Bethlehem, PA 18015, USAIdaho Geological Survey, Moscow, ID 83844, USADepartment of Earth and Environmental Sciences, Lehigh University, Bethlehem, PA 18015, USAOsservatorio Geologico di Coldigioco, Apiro, Macerata, 62021, ItalyGeological Sciences, Arizona State University, Tempe, AZ 85281, USA<p>The anisotropy of magnetic susceptibility (AMS) technique provides an effective way to measure fabrics and, in the process, interpret the kinematics of actively deforming orogens. We collected rock fabric data of alluvial fan sediments surrounding the Sierra Nevada massif, Spain, and a broader range of Cenozoic sediments and rocks across the Northern Apennine foreland, Italy, to explore the deformation fabrics that contribute to the ongoing discussions of orogenic kinematics. The Sierra Nevada is a regional massif in the hinterland of the Betic Cordillera. We recovered nearly identical kinematics regardless of specimen magnetic mineralogy, structural position, crustal depth, or time. The principal elongation axes are NE–SW in agreement with mineral lineations, regional GPS geodesy, and seismicity results. The axes trends are consistent with the convergence history of the Africa–Eurasia plate boundary. In Italy, we measured AMS fabrics of specimens collected along a NE–SW corridor spanning the transition from crustal shortening to extension in the Northern Apennines. Samples have AMS fabrics compatible only with shortening in the Apennine wedge and have locked in penetrative contractional fabrics, even for those samples that were translated into the actively extending domain. In both regions, we found that specimens have a low degree of anisotropy and oblate susceptibility ellipsoids that are consistent with tectonic deformation superposed on compaction fabrics. Collectively, these studies demonstrate the novel ways that AMS can be combined with structural, seismic, and GPS geodetic data to resolve orogenic kinematics in space and time.</p>https://se.copernicus.org/articles/12/1125/2021/se-12-1125-2021.pdf |
| spellingShingle | D. J. Anastasio F. J. Pazzaglia J. M. Parés K. P. Kodama C. Berti J. A. Fisher A. Montanari L. K. Carnes Application of anisotropy of magnetic susceptibility (AMS) fabrics to determine the kinematics of active tectonics: examples from the Betic Cordillera, Spain, and the Northern Apennines, Italy Solid Earth |
| title | Application of anisotropy of magnetic susceptibility (AMS) fabrics to determine the kinematics of active tectonics: examples from the Betic Cordillera, Spain, and the Northern Apennines, Italy |
| title_full | Application of anisotropy of magnetic susceptibility (AMS) fabrics to determine the kinematics of active tectonics: examples from the Betic Cordillera, Spain, and the Northern Apennines, Italy |
| title_fullStr | Application of anisotropy of magnetic susceptibility (AMS) fabrics to determine the kinematics of active tectonics: examples from the Betic Cordillera, Spain, and the Northern Apennines, Italy |
| title_full_unstemmed | Application of anisotropy of magnetic susceptibility (AMS) fabrics to determine the kinematics of active tectonics: examples from the Betic Cordillera, Spain, and the Northern Apennines, Italy |
| title_short | Application of anisotropy of magnetic susceptibility (AMS) fabrics to determine the kinematics of active tectonics: examples from the Betic Cordillera, Spain, and the Northern Apennines, Italy |
| title_sort | application of anisotropy of magnetic susceptibility ams fabrics to determine the kinematics of active tectonics examples from the betic cordillera spain and the northern apennines italy |
| url | https://se.copernicus.org/articles/12/1125/2021/se-12-1125-2021.pdf |
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