Glauconitization at the Cretaceous¿Paleogene boundary in Seymour Island, Antarctica: implications for the aftermath of the K-Pg mass extinction event

Comunicación oral presentada 38th International Meeting of Sedimentology in Huelva, Spain, June 26-28, 2025

Detalhes bibliográficos
Autores: López-Quirós, Adrián, Cuadros, Javier, Marco, José F., Nieto, Fernando, Román-Alpiste, Manuel Jesús, Montes, Manuel
Formato: otro
Estado:Versión publicada
Fecha de publicación:2025
País:España
Recursos:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/405316
Acesso em linha:http://hdl.handle.net/10261/405316
Access Level:acceso abierto
Palavra-chave:Glauconitic clays
K-Pg boundary
Chicxulub distal ejecta layers
REE signatures
Southern Ocean
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spelling Glauconitization at the Cretaceous¿Paleogene boundary in Seymour Island, Antarctica: implications for the aftermath of the K-Pg mass extinction eventLópez-Quirós, AdriánCuadros, JavierMarco, José F.Nieto, FernandoRomán-Alpiste, Manuel JesúsMontes, ManuelGlauconitic claysK-Pg boundaryChicxulub distal ejecta layersREE signaturesSouthern OceanComunicación oral presentada 38th International Meeting of Sedimentology in Huelva, Spain, June 26-28, 2025The Cretaceous-Paleogene (K-Pg) boundary at ~66 Ma records the most recent global mass extinction and represents a pivotal event in the evolution of life. The crisis duration and the contribution of the Chicxulub bolide impact, Deccan Traps flood volcanism and earlier Maastrichtian climate instability are still debated. The Chicxulub impact resulted in global deposition of target rocks and the vaporized bolide leading to elevated iridium (Ir) concentrations in the deposited ejecta. At the Filo Negro section on Seymour Island (Antarctica), 8000 km from the Chicxulub crater, the K-Pg boundary is represented by a ~25 cm thick green glauconitic layer with a positive Ir anomaly of 1.6 ppb. Because glaucony crystal-chemical reorganization during formation and maturation records aqueous processes and chemical conditions, it has proven key to unravelling the Earth¿s past climate and associated geophysical and geochemical processes. Glauconitization at this distal K-Pg section occurred by the replacement of faecal pellets. The K-rich (avg. 0.65 atoms p.f.u.), flaky/rosetteand pellet-shaped clay nanostructures reflect autochthonous glauconite in a mature stage of the smectite-to-glauconite evolution, consisting of smectite-poor interstratified ~10Å glauconitesmectite. Syn-sedimentary conditions controlled glaucony composition at the Seymour Island KPg section, with suboxic, partially reducing interstitial solutions causing Fe-enrichment. Glaucony authigenesis is interpreted to have developed under wholly marine conditions, at <100 m water depth, relatively cool temperatures, low sedimentation rate and stratigraphic condensation. The REE concentrations and distribution patterns indicate more than one chemical source. REE signatures suggest that glass deposited from the Chicxulub impact was the primary source for glauconite at the K-Pg limit, and influenced glauconite composition for several hundred thousand years, as evidenced by the similar REE signatures above the K-Pg event. After consumption of impact glass and recovery of ocean geochemistry, continentderived detrital minerals became the glauconite precursors. This work is the first to examine the geochemical redox evolution of oceans during and after large-scale impact events, focusing on the uptake of dissolved elements by green clay authigenesis.International Association of SedimentologistsConsejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]2025202520252025info:eu-repo/semantics/otherhttp://purl.org/coar/resource_type/c_3248Publisher's versioninfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/bookParthttp://hdl.handle.net/10261/405316reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/4053162026-05-22T06:33:51Z
dc.title.none.fl_str_mv Glauconitization at the Cretaceous¿Paleogene boundary in Seymour Island, Antarctica: implications for the aftermath of the K-Pg mass extinction event
title Glauconitization at the Cretaceous¿Paleogene boundary in Seymour Island, Antarctica: implications for the aftermath of the K-Pg mass extinction event
spellingShingle Glauconitization at the Cretaceous¿Paleogene boundary in Seymour Island, Antarctica: implications for the aftermath of the K-Pg mass extinction event
López-Quirós, Adrián
Glauconitic clays
K-Pg boundary
Chicxulub distal ejecta layers
REE signatures
Southern Ocean
title_short Glauconitization at the Cretaceous¿Paleogene boundary in Seymour Island, Antarctica: implications for the aftermath of the K-Pg mass extinction event
title_full Glauconitization at the Cretaceous¿Paleogene boundary in Seymour Island, Antarctica: implications for the aftermath of the K-Pg mass extinction event
title_fullStr Glauconitization at the Cretaceous¿Paleogene boundary in Seymour Island, Antarctica: implications for the aftermath of the K-Pg mass extinction event
title_full_unstemmed Glauconitization at the Cretaceous¿Paleogene boundary in Seymour Island, Antarctica: implications for the aftermath of the K-Pg mass extinction event
title_sort Glauconitization at the Cretaceous¿Paleogene boundary in Seymour Island, Antarctica: implications for the aftermath of the K-Pg mass extinction event
dc.creator.none.fl_str_mv López-Quirós, Adrián
Cuadros, Javier
Marco, José F.
Nieto, Fernando
Román-Alpiste, Manuel Jesús
Montes, Manuel
author López-Quirós, Adrián
author_facet López-Quirós, Adrián
Cuadros, Javier
Marco, José F.
Nieto, Fernando
Román-Alpiste, Manuel Jesús
Montes, Manuel
author_role author
author2 Cuadros, Javier
Marco, José F.
Nieto, Fernando
Román-Alpiste, Manuel Jesús
Montes, Manuel
author2_role 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 Glauconitic clays
K-Pg boundary
Chicxulub distal ejecta layers
REE signatures
Southern Ocean
topic Glauconitic clays
K-Pg boundary
Chicxulub distal ejecta layers
REE signatures
Southern Ocean
description Comunicación oral presentada 38th International Meeting of Sedimentology in Huelva, Spain, June 26-28, 2025
publishDate 2025
dc.date.none.fl_str_mv 2025
2025
2025
2025
dc.type.none.fl_str_mv info:eu-repo/semantics/other
http://purl.org/coar/resource_type/c_3248
Publisher's version
info:eu-repo/semantics/publishedVersion
dc.type.openaire.fl_str_mv info:eu-repo/semantics/bookPart
format other
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/405316
url http://hdl.handle.net/10261/405316
dc.relation.none.fl_str_mv Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv International Association of Sedimentologists
publisher.none.fl_str_mv International Association of Sedimentologists
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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score 15,812455

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