Ändra sökning
RefereraExporteraLänk till posten
Permanent länk

Direktlänk
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
The Cretaceous/Paleogene Boundary Deposits on Gorgonilla Island
Grupo de Investigación Paleoexplorer.ORCID-id: 0000-0003-0656-2007
Universidad de Zaragoza.
Universidad de Zaragoza.
Naturhistoriska riksmuseet, Enheten för paleobiologi. Department of Geology, Lund University, Sweden.ORCID-id: 0000-0003-2987-5559
Visa övriga samt affilieringar
2019 (Engelska)Ingår i: The Geology of Colombia, Volume 3 Paleogene – Neogene / [ed] Gómez, J. & Mateus–Zabala, D., Bogota: Servi­cio Geológico Colombiano , 2019, 1, s. 1-19Kapitel i bok, del av antologi (Refereegranskat)
Abstract [en]

A ca. 20 mm thick spherule bed representing Chicxulub impact ejecta deposits and marking the Cretaceous/Paleogene (K/Pg) boundary was recently discovered on Gorgonilla Island (Gorgona National Natural Park, Pacific of Colombia). This discovery represents the first confirmed record of the K/Pg event in Colombia, South America and the eastern Pacific Ocean. The deposit consists of extraordinarily well–preserved glass spherules (microtektites and microkrystites) reaching 1.1 mm in diameter. Importantly, the Gorgonilla spherule bed is unique relative to other K/Pg boundary sites in that up to 90% of the spherules are intact and not devitrified, and the bed is virtually devoid of lithic fragments and microfossils. The spherules were deposited in a deep marine environment, possibly below the calcite compensation depth. The preservation, normal size–gradation, presence of fine textures within the spherules, and absence of bioturbation or traction transport indicate that the Gorgonilla spherules settled within a water column with minimal disturbance. The spherule bed may represent one of the first parautochthonous primary deposits of the Chicxulub impact known to date. 40Ar/39Ar dating and micropaleontological analysis reveal that the Gorgonilla spherule bed resulted from the Chicxulub impact. Intense soft–sediment deformation and bed disruption in Maastrichtian sediments of the Gorgonilla Island K/Pg section provide evidence for seismic activity triggered by the Chicxulub bolide impact, 66 million years ago. It is also notable that the basal deposits of the Danian in the Colombian locality present the first evidence of a recovery vegetation, characterized by ferns from a tropical habitat, shortly following the end–Cretaceous event.

Ort, förlag, år, upplaga, sidor
Bogota: Servi­cio Geológico Colombiano , 2019, 1. s. 1-19
Serie
Servi­cio Geológico Colombiano, Publicaciones Geológicas Especiales
Nyckelord [en]
K/Pg boundary, Chicxulub, microtektites, seismites, Gorgonilla Island, Colombia
Nationell ämneskategori
Annan geovetenskap och miljövetenskap
Forskningsämne
Den föränderliga jorden
Identifikatorer
URN: urn:nbn:se:nrm:diva-3414DOI: 10.32685/pub.esp.37.2019.01OAI: oai:DiVA.org:nrm-3414DiVA, id: diva2:1372917
Forskningsfinansiär
Vetenskapsrådet, 2015-4264Tillgänglig från: 2019-06-01 Skapad: 2019-11-25Bibliografiskt granskad

Open Access i DiVA

Fulltext saknas i DiVA

Övriga länkar

Förlagets fulltexthttps://doi.org/10.32685/pub.esp.37.2019.01

Sök vidare i DiVA

Av författaren/redaktören
Bermúdez, HermannVajda, Vivi
Av organisationen
Enheten för paleobiologi
Annan geovetenskap och miljövetenskap

Sök vidare utanför DiVA

GoogleGoogle Scholar

doi
urn-nbn

Altmetricpoäng

doi
urn-nbn
Totalt: 727 träffar
RefereraExporteraLänk till posten
Permanent länk

Direktlänk
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf