Magnetic susceptibility controlled by climate-driven weathering intensity
Magnetic susceptibility (MS) variations are commonly attributed to eustatic and/or climatic changes that impact the delivery of fine-grained detrital magnetic minerals. However, the mechanism responsible for sourcing magnetic minerals from land to the ocean is not fully understood. Bulk mineralogy,...
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EDP Sciences
2024-01-01
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| Series: | BSGF - Earth Sciences Bulletin |
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| Online Access: | https://www.bsgf.fr/articles/bsgf/full_html/2024/01/bsgf240010/bsgf240010.html |
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| author | Aubineau Jérémie Antonio Paul Y.J. El Bamiki Radouan Parat Fleurice Camps Pierre Raji Otmane Jourani Es-Said Bodinier Jean-Louis Macouin Mélina Gilder Stuart Rousse Sonia Séranne Michel |
| author_facet | Aubineau Jérémie Antonio Paul Y.J. El Bamiki Radouan Parat Fleurice Camps Pierre Raji Otmane Jourani Es-Said Bodinier Jean-Louis Macouin Mélina Gilder Stuart Rousse Sonia Séranne Michel |
| author_sort | Aubineau Jérémie |
| collection | DOAJ |
| description | Magnetic susceptibility (MS) variations are commonly attributed to eustatic and/or climatic changes that impact the delivery of fine-grained detrital magnetic minerals. However, the mechanism responsible for sourcing magnetic minerals from land to the ocean is not fully understood. Bulk mineralogy, Rietveld refinements of powder XRD patterns, and whole-rock geochemistry, combined with a MS investigation across a ∼290 m-thick Upper Cretaceous/Paleogene sedimentary sequence at Erguita, Morocco, imply that iron is exclusively detrital in origin. Moreover, MS fluctuations occurred independently from depositional setting and sea-level variations. Rock magnetism investigations further show that a complex assemblage of ferromagnetic sensu lato minerals is recorded in the Erguita sedimentary section, and a proportion of more or less oxidized magnetite supplied to the depositional setting controls the MS variations. This study chronicles that the weathering of the Anti-Atlas crystalline basement led to the supply of detrital Fe-bearing phyllosilicates and ferromagnetic (sensu lato) Fe-oxides to the eastern passive margin of the Atlantic Ocean from the Late Cretaceous to the mid-Paleogene. Higher weathering intensity drove up the detrital magnetic material in all lithologies, which, in turn, increased the MS signal. Importantly, this model nicely coincides with the climatic upheavals of the Paleogene. We propose that this unrecognized link between MS and climate-driven weathering intensity is paramount to unraveling the origin of the low MS interval below the Cretaceous-Paleogene boundary. Climate cooling resulting in reduced weathering rather than a global acidification triggered by Phase 2 of Deccan volcanism could help explain the MS trend at that time. |
| format | Article |
| id | doaj-art-cbe42b73f3064c93a10aca0655b4e00a |
| institution | Kabale University |
| issn | 1777-5817 |
| language | English |
| publishDate | 2024-01-01 |
| publisher | EDP Sciences |
| record_format | Article |
| series | BSGF - Earth Sciences Bulletin |
| spelling | doaj-art-cbe42b73f3064c93a10aca0655b4e00a2025-01-06T11:03:27ZengEDP SciencesBSGF - Earth Sciences Bulletin1777-58172024-01-011952510.1051/bsgf/2024025bsgf240010Magnetic susceptibility controlled by climate-driven weathering intensityAubineau Jérémie0https://orcid.org/0000-0002-7847-6207Antonio Paul Y.J.1https://orcid.org/0000-0002-6625-0059El Bamiki Radouan2Parat Fleurice3Camps Pierre4https://orcid.org/0000-0002-6637-4342Raji Otmane5Jourani Es-Said6Bodinier Jean-Louis7Macouin Mélina8Gilder Stuart9Rousse Sonia10Séranne Michel11Géosciences Environnement Toulouse, CNRS UMR 5563 (CNRS/UPS/IRD/CNES), Université de ToulouseGéosciences Montpellier, Université de Montpellier, CNRS UMR 5243Geology and Sustainable Mining Institute, Mohammed VI Polytechnic UniversityGéosciences Montpellier, Université de Montpellier, CNRS UMR 5243Géosciences Montpellier, Université de Montpellier, CNRS UMR 5243Geology and Sustainable Mining Institute, Mohammed VI Polytechnic UniversityGeology and Sustainable Mining Institute, Mohammed VI Polytechnic UniversityGeology and Sustainable Mining Institute, Mohammed VI Polytechnic UniversityGéosciences Environnement Toulouse, CNRS UMR 5563 (CNRS/UPS/IRD/CNES), Université de ToulouseDepartment of Earth and Environmental Sciences, Ludwig Maximilians UniversityGéosciences Environnement Toulouse, CNRS UMR 5563 (CNRS/UPS/IRD/CNES), Université de ToulouseGéosciences Montpellier, Université de Montpellier, CNRS UMR 5243Magnetic susceptibility (MS) variations are commonly attributed to eustatic and/or climatic changes that impact the delivery of fine-grained detrital magnetic minerals. However, the mechanism responsible for sourcing magnetic minerals from land to the ocean is not fully understood. Bulk mineralogy, Rietveld refinements of powder XRD patterns, and whole-rock geochemistry, combined with a MS investigation across a ∼290 m-thick Upper Cretaceous/Paleogene sedimentary sequence at Erguita, Morocco, imply that iron is exclusively detrital in origin. Moreover, MS fluctuations occurred independently from depositional setting and sea-level variations. Rock magnetism investigations further show that a complex assemblage of ferromagnetic sensu lato minerals is recorded in the Erguita sedimentary section, and a proportion of more or less oxidized magnetite supplied to the depositional setting controls the MS variations. This study chronicles that the weathering of the Anti-Atlas crystalline basement led to the supply of detrital Fe-bearing phyllosilicates and ferromagnetic (sensu lato) Fe-oxides to the eastern passive margin of the Atlantic Ocean from the Late Cretaceous to the mid-Paleogene. Higher weathering intensity drove up the detrital magnetic material in all lithologies, which, in turn, increased the MS signal. Importantly, this model nicely coincides with the climatic upheavals of the Paleogene. We propose that this unrecognized link between MS and climate-driven weathering intensity is paramount to unraveling the origin of the low MS interval below the Cretaceous-Paleogene boundary. Climate cooling resulting in reduced weathering rather than a global acidification triggered by Phase 2 of Deccan volcanism could help explain the MS trend at that time.https://www.bsgf.fr/articles/bsgf/full_html/2024/01/bsgf240010/bsgf240010.htmlmagnetic susceptibilityweatheringclimatecretaceous / paleogeneerguitamorocco |
| spellingShingle | Aubineau Jérémie Antonio Paul Y.J. El Bamiki Radouan Parat Fleurice Camps Pierre Raji Otmane Jourani Es-Said Bodinier Jean-Louis Macouin Mélina Gilder Stuart Rousse Sonia Séranne Michel Magnetic susceptibility controlled by climate-driven weathering intensity BSGF - Earth Sciences Bulletin magnetic susceptibility weathering climate cretaceous / paleogene erguita morocco |
| title | Magnetic susceptibility controlled by climate-driven weathering intensity |
| title_full | Magnetic susceptibility controlled by climate-driven weathering intensity |
| title_fullStr | Magnetic susceptibility controlled by climate-driven weathering intensity |
| title_full_unstemmed | Magnetic susceptibility controlled by climate-driven weathering intensity |
| title_short | Magnetic susceptibility controlled by climate-driven weathering intensity |
| title_sort | magnetic susceptibility controlled by climate driven weathering intensity |
| topic | magnetic susceptibility weathering climate cretaceous / paleogene erguita morocco |
| url | https://www.bsgf.fr/articles/bsgf/full_html/2024/01/bsgf240010/bsgf240010.html |
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