Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
The Habitat of the Nascent Chicxulub Crater
Pennsylvania State University.
Pennsylvania State University.
Pennsylvania State University.
University of Texas at Austin.
Show others and affiliations
2020 (English)In: AGU Advances, Vol. 1, article id e2020AV000208Article in journal (Refereed) Published
Abstract [en]

An expanded sedimentary section provides an opportunity to elucidate conditions in the nascent Chicxulub crater during the hours to millennia after the Cretaceous‐Paleogene (K‐Pg) boundary impact. The sediments were deposited by tsunami followed by seiche waves as energy in the crater declined, culminating in a thin hemipelagic marlstone unit that contains atmospheric fallout. Seiche deposits are predominantly composed of calcite formed by decarbonation of the target limestone during impact followed by carbonation in the water column. Temperatures recorded by clumped isotopes of these carbonates are in excess of 70°C, with heat likely derived from the central impact melt pool. Yet, despite the turbidity and heat, waters within the nascent crater basin soon became a viable habitat for a remarkably diverse cross section of the food chain. The earliest seiche layers deposited with days or weeks of the impact contain earliest Danian nannoplankton and dinocyst survivors. The hemipelagic marlstone representing the subsequent years to a few millennia contains a nearly monogeneric calcareous dinoflagellate resting cyst assemblage suggesting deteriorating environmental conditions, with one interpretation involving low light levels in the impact aftermath. At the same horizon, microbial fossils indicate a thriving bacterial community and unique phosphatic fossils including appendages of pelagic crustaceans, coprolites andbacteria‐tunneled fish bone, suggesting that this rapid recovery of the base of the food chain may have supported the survival of larger, higher trophic‐level organisms. The extraordinarily diverse fossil assemblage indicates that the crater was a unique habitat in the immediate impact aftermath, possibly as aresult of heat and nutrients supplied by hydrothermal activity.

Place, publisher, year, edition, pages
American Geophysical Union (AGU), 2020. Vol. 1, article id e2020AV000208
Keywords [en]
Mexico, K-Pg boundary, Chicxulub impact, Palaeoenvironment
National Category
Other Earth and Related Environmental Sciences
Research subject
The changing Earth
Identifiers
URN: urn:nbn:se:nrm:diva-4112DOI: 10.1029/2020AV000208OAI: oai:DiVA.org:nrm-4112DiVA, id: diva2:1511615
Funder
Swedish Research Council, 2019-04061Available from: 2020-12-18 Created: 2020-12-18 Last updated: 2020-12-18Bibliographically approved

Open Access in DiVA

fulltext(23177 kB)69 downloads
File information
File name FULLTEXT01.pdfFile size 23177 kBChecksum SHA-512
16c293ceb998d614fee763df407cd8c83bbd54f093a109f78d4cd8b1ab4074db9ec3dfa211425680344a8305cd59c9ec3c2371745fef036d0cac35972aa9e5e6
Type fulltextMimetype application/pdf

Other links

Publisher's full texthttps:// doi.org/10.1029/2020AV000208

Search in DiVA

By author/editor
Vajda, Vivi
By organisation
Department of Paleobiology
Other Earth and Related Environmental Sciences

Search outside of DiVA

GoogleGoogle Scholar
Total: 69 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

doi
urn-nbn

Altmetric score

doi
urn-nbn
Total: 400 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf