Interpretation of magnetic anomalies of geological and archaeological origins in a volcanic area (Tusculum site, Lazio, Italy): Methodological proposals

A detailed magnetic survey combined with the study of magnetic properties and spectral analysis in the Tusculum archaeological site (Alban Hills, Italy) indicates the existence of magnetic anomalies (total field and gradient, showing amplitudes up to thousands of nT) resulting from combined geologic...

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Autores: Diarte-Blasco, Pilar, Casas Cendoya, Ana María, Pocoví Juan, Andrés, Villalaín, Juan J., Muñoz, A., Beolchini, Valeria, Pueyo Anchuela, Óscar, Peña-Chocarro, Leonor
Tipo de recurso: artículo
Estado:Versión aceptada para publicación
Fecha de publicación:2020
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/229573
Acceso en línea:http://hdl.handle.net/10261/229573
Access Level:acceso abierto
Palabra clave:Geophysical prospecting
Magnetometry
Magnetic anomaly
Magnetic mineralogy
Spectral analysis
Rome
Tusculum
Archaeological excavations
Archaeological sites
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spelling Interpretation of magnetic anomalies of geological and archaeological origins in a volcanic area (Tusculum site, Lazio, Italy): Methodological proposalsDiarte-Blasco, PilarCasas Cendoya, Ana MaríaPocoví Juan, AndrésVillalaín, Juan J.Muñoz, A.Beolchini, ValeriaPueyo Anchuela, ÓscarPeña-Chocarro, LeonorGeophysical prospectingMagnetometryMagnetic anomalyMagnetic mineralogySpectral analysisRomeTusculumArchaeological excavationsArchaeological sitesA detailed magnetic survey combined with the study of magnetic properties and spectral analysis in the Tusculum archaeological site (Alban Hills, Italy) indicates the existence of magnetic anomalies (total field and gradient, showing amplitudes up to thousands of nT) resulting from combined geological and archaeological features. In this paper we propose a two-fold analysis based on both manual and automatic procedures for a precise characterization of those elements from total magnetic field and magnetic gradient profiles. The first, automated step consists in spectral analysis of a long (1.2 km) profile to define the dominant wavelengths related to geological and/or archaeological features. The second, manual step consists of the definition of a hierarchical pattern of magnetic anomalies, according to their amplitude and pervasiveness, in the selected (90 × 90 m) area. The defined anomaly pattern includes 1st-order, total field, magnetic anomaly (1000 nT, decreasing towards the North) related to the geological (volcanic) background, 2nd order anomalies (tens to hundreds of nT), showing a marked periodicity, revealed by spectral analysis, in the magnetic gradient in the 1.2 km long profile, and, finally, superimposed 3rd order anomalies (on the order of several nT). Most second-order and some of the third order anomalies are normal dipoles arranged in an orthogonal pattern in plan view, and can be interpreted as linked to the main roman walls of public buildings or roads. The magnetic susceptibility of most materials used in Roman constructions (volcanic tuff and basalt, whose lithology was characterized by means of thin sections) ranges from 600 to 110,000 × 10−6 S.I., contrasting with the overall lower susceptibility of soil fillings between walls, what explains most of the anomalies found. Magnetite and other iron oxides and sulphides are the main ferromagnetic phases in construction materials. Koenigsberger ratios of roman construction materials vary between 0.25 and 107 what explains for magnetic remanence to have played a certain (but limited) role in some particular magnetic anomalies.Peer reviewedElsevier BVConsejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]2021202120202021info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Postprintinfo:eu-repo/semantics/acceptedVersionapplication/pdfhttp://hdl.handle.net/10261/229573reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Ingléshttps://doi.org/10.1016/j.jappgeo.2020.103942Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/2295732026-05-22T06:33:51Z
dc.title.none.fl_str_mv Interpretation of magnetic anomalies of geological and archaeological origins in a volcanic area (Tusculum site, Lazio, Italy): Methodological proposals
title Interpretation of magnetic anomalies of geological and archaeological origins in a volcanic area (Tusculum site, Lazio, Italy): Methodological proposals
spellingShingle Interpretation of magnetic anomalies of geological and archaeological origins in a volcanic area (Tusculum site, Lazio, Italy): Methodological proposals
Diarte-Blasco, Pilar
Geophysical prospecting
Magnetometry
Magnetic anomaly
Magnetic mineralogy
Spectral analysis
Rome
Tusculum
Archaeological excavations
Archaeological sites
title_short Interpretation of magnetic anomalies of geological and archaeological origins in a volcanic area (Tusculum site, Lazio, Italy): Methodological proposals
title_full Interpretation of magnetic anomalies of geological and archaeological origins in a volcanic area (Tusculum site, Lazio, Italy): Methodological proposals
title_fullStr Interpretation of magnetic anomalies of geological and archaeological origins in a volcanic area (Tusculum site, Lazio, Italy): Methodological proposals
title_full_unstemmed Interpretation of magnetic anomalies of geological and archaeological origins in a volcanic area (Tusculum site, Lazio, Italy): Methodological proposals
title_sort Interpretation of magnetic anomalies of geological and archaeological origins in a volcanic area (Tusculum site, Lazio, Italy): Methodological proposals
dc.creator.none.fl_str_mv Diarte-Blasco, Pilar
Casas Cendoya, Ana María
Pocoví Juan, Andrés
Villalaín, Juan J.
Muñoz, A.
Beolchini, Valeria
Pueyo Anchuela, Óscar
Peña-Chocarro, Leonor
author Diarte-Blasco, Pilar
author_facet Diarte-Blasco, Pilar
Casas Cendoya, Ana María
Pocoví Juan, Andrés
Villalaín, Juan J.
Muñoz, A.
Beolchini, Valeria
Pueyo Anchuela, Óscar
Peña-Chocarro, Leonor
author_role author
author2 Casas Cendoya, Ana María
Pocoví Juan, Andrés
Villalaín, Juan J.
Muñoz, A.
Beolchini, Valeria
Pueyo Anchuela, Óscar
Peña-Chocarro, Leonor
author2_role author
author
author
author
author
author
author
dc.contributor.none.fl_str_mv Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Geophysical prospecting
Magnetometry
Magnetic anomaly
Magnetic mineralogy
Spectral analysis
Rome
Tusculum
Archaeological excavations
Archaeological sites
topic Geophysical prospecting
Magnetometry
Magnetic anomaly
Magnetic mineralogy
Spectral analysis
Rome
Tusculum
Archaeological excavations
Archaeological sites
description A detailed magnetic survey combined with the study of magnetic properties and spectral analysis in the Tusculum archaeological site (Alban Hills, Italy) indicates the existence of magnetic anomalies (total field and gradient, showing amplitudes up to thousands of nT) resulting from combined geological and archaeological features. In this paper we propose a two-fold analysis based on both manual and automatic procedures for a precise characterization of those elements from total magnetic field and magnetic gradient profiles. The first, automated step consists in spectral analysis of a long (1.2 km) profile to define the dominant wavelengths related to geological and/or archaeological features. The second, manual step consists of the definition of a hierarchical pattern of magnetic anomalies, according to their amplitude and pervasiveness, in the selected (90 × 90 m) area. The defined anomaly pattern includes 1st-order, total field, magnetic anomaly (1000 nT, decreasing towards the North) related to the geological (volcanic) background, 2nd order anomalies (tens to hundreds of nT), showing a marked periodicity, revealed by spectral analysis, in the magnetic gradient in the 1.2 km long profile, and, finally, superimposed 3rd order anomalies (on the order of several nT). Most second-order and some of the third order anomalies are normal dipoles arranged in an orthogonal pattern in plan view, and can be interpreted as linked to the main roman walls of public buildings or roads. The magnetic susceptibility of most materials used in Roman constructions (volcanic tuff and basalt, whose lithology was characterized by means of thin sections) ranges from 600 to 110,000 × 10−6 S.I., contrasting with the overall lower susceptibility of soil fillings between walls, what explains most of the anomalies found. Magnetite and other iron oxides and sulphides are the main ferromagnetic phases in construction materials. Koenigsberger ratios of roman construction materials vary between 0.25 and 107 what explains for magnetic remanence to have played a certain (but limited) role in some particular magnetic anomalies.
publishDate 2020
dc.date.none.fl_str_mv 2020
2021
2021
2021
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Postprint
info:eu-repo/semantics/acceptedVersion
format article
status_str acceptedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/229573
url http://hdl.handle.net/10261/229573
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv https://doi.org/10.1016/j.jappgeo.2020.103942
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Elsevier BV
publisher.none.fl_str_mv Elsevier BV
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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