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Multi-proxy record of the Chicxulub impact at the Cretaceous-Paleogene boundary from Gorgonilla Island, Colombia
Berkeley Geochronology Center, Berkeley, California 94709, USA.
Departamento de Ciencias de la Tierra, and Instituto Universitario de Investigación en Ciencias Ambientales de Aragón, Universidad de Zaragoza, E-50009 Zaragoza, Spain.
Departamento de Ciencias de la Tierra, and Instituto Universitario de Investigación en Ciencias Ambientales de Aragón, Universidad de Zaragoza, E-50009 Zaragoza, Spain.
Swedish Museum of Natural History, Department of Paleobiology. Department of Geology, Lund University, Sweden.ORCID iD: 0000-0003-2987-5559
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2018 (English)In: Geology, ISSN 0091-7613, E-ISSN 1943-2682, Vol. 46, p. 547-550Article in journal (Refereed) Published
Abstract [en]

A 40 m stratigraphic section at Gorgonilla Island, Colombia, provides a unique deepmarine, low-latitude, Southern Hemisphere record of events related to the end-Cretaceous Chicxulub impact and the global Cretaceous/Paleogene boundary (KPB). The KPB is marked by a 20-mm-thick, densely packed spherule bed as defined by planktic foraminifera, in contrast to complex relationships found in high-energy, impact-proximal sites in the Gulf of Mexico and Caribbean basins. The absence of basal Danian foraminiferal Zone P0 may indicate a possible hiatus of <10 ka immediately above the spherule bed, but is most probably an artifact of deposition below the calcite compensation depth as suggested by the nearly complete absence of calcareous fossils for 20 m below the Zone Pα. A weighted mean 40Ar/39Ar age of 66.051 ± 0.031 Ma for 25 fresh glassy spherules unequivocally establishes both their derivation from Chicxulub, and the association between the impact and the KPB. The spherule bed, and Maastrichtian strata below it, display soft-sediment deformation features consistent with strong seismic motion, suggesting that seismic activity in the immediate aftermath of the Chicxulub impact continued for weeks. We discovered a fern-spike immediately above the spherule bed, representing the first record of this pioneer vegetation from the South American continent, and from a low-latitude (tropical) environment.

Place, publisher, year, edition, pages
Denver: Geological Society of America, 2018. Vol. 46, p. 547-550
Keywords [en]
Mass extinction, asteroid impact, Cretaceous, Colombia, palynology, stratigraphy
National Category
Other Earth and Related Environmental Sciences
Research subject
The changing Earth
Identifiers
URN: urn:nbn:se:nrm:diva-3235DOI: 10.1130/G40224.1OAI: oai:DiVA.org:nrm-3235DiVA, id: diva2:1276123
Funder
Swedish Research Council, 2015–4264
Note

This study is a contribution to project CGL2015–64422-P (MINECO/FEDER-UE, Spanish Ministry of Economy, Industry and Competitiveness and the European Fund for Regional Development). Gilabert acknowledges support from the MINECO/FEDER-UE (FPI grant BES-2016–077800). Vajda was supported by the Swedish Research Council (VR grant 2015–4264, and LUCCI, Lund University Carbon Cycle Centre). Authors thank Paleoexplorer SAS (Colombia) for logistics and fieldwork support, and Parques Nacionales Naturales de Colombia

Available from: 2019-01-01 Created: 2019-01-07Bibliographically approved

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