Archaeomagnetic analyses on fumiers burned under controlled experimental conditions
The improvement of the archaeomagnetic dating method requires compiling new and older data of the Earth's magnetic field (EMF) variations for the last millennia. Combustion events from fumier sequences have been proposed as good directional EMF recorders. However, they are subjected to diverse...
| Autores: | , , , |
|---|---|
| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2024 |
| País: | España |
| Institución: | Universidad de Burgos (UBU) |
| Repositorio: | Repositorio Institucional de la Universidad de Burgos (RIUBU) |
| OAI Identifier: | oai:riubu.ubu.es:10259/9280 |
| Acceso en línea: | http://hdl.handle.net/10259/9280 |
| Access Level: | acceso abierto |
| Palabra clave: | Fumier Taphonomy Archaeological fire Experimental archaeology Paleotemperatures Secular variation Paleontología Magnetismo Paleontology Magnetism |
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| dc.title.none.fl_str_mv |
Archaeomagnetic analyses on fumiers burned under controlled experimental conditions |
| title |
Archaeomagnetic analyses on fumiers burned under controlled experimental conditions |
| spellingShingle |
Archaeomagnetic analyses on fumiers burned under controlled experimental conditions Carrancho Alonso, Ángel Fumier Taphonomy Archaeological fire Experimental archaeology Paleotemperatures Secular variation Paleontología Magnetismo Paleontology Magnetism |
| title_short |
Archaeomagnetic analyses on fumiers burned under controlled experimental conditions |
| title_full |
Archaeomagnetic analyses on fumiers burned under controlled experimental conditions |
| title_fullStr |
Archaeomagnetic analyses on fumiers burned under controlled experimental conditions |
| title_full_unstemmed |
Archaeomagnetic analyses on fumiers burned under controlled experimental conditions |
| title_sort |
Archaeomagnetic analyses on fumiers burned under controlled experimental conditions |
| dc.creator.none.fl_str_mv |
Carrancho Alonso, Ángel Bradák, Balázs Herrejón Lagunilla, Ángela Vergés, Josep María |
| author |
Carrancho Alonso, Ángel |
| author_facet |
Carrancho Alonso, Ángel Bradák, Balázs Herrejón Lagunilla, Ángela Vergés, Josep María |
| author_role |
author |
| author2 |
Bradák, Balázs Herrejón Lagunilla, Ángela Vergés, Josep María |
| author2_role |
author author author |
| dc.subject.none.fl_str_mv |
Fumier Taphonomy Archaeological fire Experimental archaeology Paleotemperatures Secular variation Paleontología Magnetismo Paleontology Magnetism |
| topic |
Fumier Taphonomy Archaeological fire Experimental archaeology Paleotemperatures Secular variation Paleontología Magnetismo Paleontology Magnetism |
| description |
The improvement of the archaeomagnetic dating method requires compiling new and older data of the Earth's magnetic field (EMF) variations for the last millennia. Combustion events from fumier sequences have been proposed as good directional EMF recorders. However, they are subjected to diverse taphonomical processes and how these affect the archaeomagnetic record has not yet been studied. In order to evaluate it, here we report the first archaeomagnetic and rock-magnetic results on samples from experimentally recreated fumiers since 2014 under controlled conditions. A facies description with unprecedent resolution was used to study the variation of magnetic properties in depth. Rock-magnetic analyses indicate a homogenous magnetic mineralogy dominated by pseudo-single domain magnetite as main carrier in all facies, with not very high and similar contribution of the finest (superparamagnetic) grains. The low values of anisotropy of magnetic susceptibility (AMS) indicate that the studied sample set is mainly isotropic. The directional behaviour in well-preserved burned facies (here described as G, LM and DGB), are jointly characterized by highly reversible thermomagnetic curves, high Koenigberger (Qn) ratio values and intense, univectorial and normal polarity orthogonal NRM demagnetization diagrams. On the contrary, specimens affected by mechanical alteration processes are less magnetic and show anomalous directional behaviours. The high thermomagnetic reversibility of ashes indicates that they reached ca. 600–700 °C, in line with the thermocouples’ data. Temperatures of 460 °C were obtained for the DGB facies (subyacent black carbonaceous facies). Sampling of ashes located on the top of these combustion events should be avoided for archaeomagnetism. Being just beneath the last stabling episode they are the most prone to undergo mechanical alterations and do not preserve well the Earth's magnetic field direction. Despite their unlithified nature and the multiple taphonomic processes that fumier sequences may undergo, under certain quality criteria, they are valid geomagnetic field recorders providing both information of archaeological and geophysical interest. |
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2024 |
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2024 2024 2024 |
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info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion |
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article |
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publishedVersion |
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http://hdl.handle.net/10259/9280 |
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http://hdl.handle.net/10259/9280 |
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Inglés |
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Inglés |
| dc.relation.none.fl_str_mv |
Quaternary International. 2024, V. 683-684, p. 92-103 https://doi.org/10.1016/j.quaint.2023.09.005 |
| dc.rights.none.fl_str_mv |
Attribution-NonCommercial-NoDerivatives 4.0 Internacional http://creativecommons.org/licenses/by-nc-nd/4.0/ info:eu-repo/semantics/openAccess |
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Attribution-NonCommercial-NoDerivatives 4.0 Internacional http://creativecommons.org/licenses/by-nc-nd/4.0/ |
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openAccess |
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application/pdf |
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Elsevier |
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Elsevier |
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reponame:Repositorio Institucional de la Universidad de Burgos (RIUBU) instname:Universidad de Burgos (UBU) |
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Universidad de Burgos (UBU) |
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Repositorio Institucional de la Universidad de Burgos (RIUBU) |
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Repositorio Institucional de la Universidad de Burgos (RIUBU) |
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1869419323389378560 |
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Archaeomagnetic analyses on fumiers burned under controlled experimental conditionsCarrancho Alonso, ÁngelBradák, BalázsHerrejón Lagunilla, ÁngelaVergés, Josep MaríaFumierTaphonomyArchaeological fireExperimental archaeologyPaleotemperaturesSecular variationPaleontologíaMagnetismoPaleontologyMagnetismThe improvement of the archaeomagnetic dating method requires compiling new and older data of the Earth's magnetic field (EMF) variations for the last millennia. Combustion events from fumier sequences have been proposed as good directional EMF recorders. However, they are subjected to diverse taphonomical processes and how these affect the archaeomagnetic record has not yet been studied. In order to evaluate it, here we report the first archaeomagnetic and rock-magnetic results on samples from experimentally recreated fumiers since 2014 under controlled conditions. A facies description with unprecedent resolution was used to study the variation of magnetic properties in depth. Rock-magnetic analyses indicate a homogenous magnetic mineralogy dominated by pseudo-single domain magnetite as main carrier in all facies, with not very high and similar contribution of the finest (superparamagnetic) grains. The low values of anisotropy of magnetic susceptibility (AMS) indicate that the studied sample set is mainly isotropic. The directional behaviour in well-preserved burned facies (here described as G, LM and DGB), are jointly characterized by highly reversible thermomagnetic curves, high Koenigberger (Qn) ratio values and intense, univectorial and normal polarity orthogonal NRM demagnetization diagrams. On the contrary, specimens affected by mechanical alteration processes are less magnetic and show anomalous directional behaviours. The high thermomagnetic reversibility of ashes indicates that they reached ca. 600–700 °C, in line with the thermocouples’ data. Temperatures of 460 °C were obtained for the DGB facies (subyacent black carbonaceous facies). Sampling of ashes located on the top of these combustion events should be avoided for archaeomagnetism. Being just beneath the last stabling episode they are the most prone to undergo mechanical alterations and do not preserve well the Earth's magnetic field direction. Despite their unlithified nature and the multiple taphonomic processes that fumier sequences may undergo, under certain quality criteria, they are valid geomagnetic field recorders providing both information of archaeological and geophysical interest.This research was funded by project PID 2019-105796 GB-I00 of the Agencia Estatal de Investigación (AEI/10.13039/501100011033). Á.H.L. thanks the financial support of a Margarita Salas postdoctoral contract (2022–2024), funded by the Spanish Ministry of University & European Union-NextGenerationEU. The Institut Català de Paleoecologia Humana i Evolució Social (IPHES-CERCA) has received financial support from the Spanish Ministry of Science and Innovation through the “María de Maeztu” program for Units of Excellence (CEX 2019-000945-M). We are very grateful to Pere Domenech, for the facilities given to carry out the experimental program with his livestock and pen, as well as for his help and advice. We also thank Anton Vallvey and Ester Trullols, PNIN Poblet's directors, for their help and collaboration. Thanks are also due to the members of the brigades of maintenance of Poblet PNIN, for their help and support with the fieldwork and also to Aitor Burguet for his assistance with the sampling. The experimental program has been funded by MICINN project (PID 2021-122355NB-C32), the Generalitat de Catalunya (SGR 2017 1040) and the Municipality of Montblanc. The editors of this volume are kindly acknowledged for considering us for this contribution. We are also grateful to two anonymous reviewers for their useful and thoughtful comments which improved the manuscript.Elsevier202420242024info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttp://hdl.handle.net/10259/9280reponame:Repositorio Institucional de la Universidad de Burgos (RIUBU)instname:Universidad de Burgos (UBU)InglésQuaternary International. 2024, V. 683-684, p. 92-103https://doi.org/10.1016/j.quaint.2023.09.005Attribution-NonCommercial-NoDerivatives 4.0 Internacionalhttp://creativecommons.org/licenses/by-nc-nd/4.0/info:eu-repo/semantics/openAccessoai:riubu.ubu.es:10259/92802026-05-28T07:56:11Z |
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