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dc.contributor.authorO’Connor, LK
dc.contributor.authorCrampton-Flood, ED
dc.contributor.authorJerrett, RM
dc.contributor.authorPrice, GD
dc.contributor.authorNaafs, BDA
dc.contributor.authorPancost, RD
dc.contributor.authorMcCormack, P
dc.contributor.authorLempotesis-Davies, A
dc.contributor.authorvan Dongen, BE
dc.contributor.authorLengger, SK
dc.date.accessioned2023-08-07T10:04:41Z
dc.date.available2023-08-07T10:04:41Z
dc.date.issued2023-05-01
dc.identifier.issn0091-7613
dc.identifier.issn1943-2682
dc.identifier.urihttps://pearl.plymouth.ac.uk/handle/10026.1/21170
dc.description.abstract

The Cretaceous-Paleogene (K-Pg) boundary marks one of the five major mass extinctions of the Phanerozoic. The ways in which the climate system responded to a bolide impact and extensive volcanism at this time over different time scales are highly debated. We used the distribution of branched tetraether lipids (brGDGT) from fossil peats at two sites in Saskatchewan, Canada (paleolatitude ~55°N), to generate a high-resolution (millennial) record of mean annual air temperature (MAAT) spanning the last ~4 k.y. of the Cretaceous and the first ~30 k.y. of the Paleogene. Our study shows that MAATs ranged from 16 to 29 °C, with the highest value in the first millennia of the Paleogene. The earliest Paleogene averaged ~25 °C—maintaining or enhancing warmth from the latest Cretaceous—followed by a general cooling to ~20 °C over the following ~30 k.y. No abrupt postboundary cooling (e.g., an “impact winter”) or abrupt warming is evident in our data, implying that if such phenomena occurred, their duration was relatively short-lived (i.e., sub-millennial-scale). Further, no long-term impactor volcanism-driven warming is evident. The range of temperature change observed is considerably greater than that derived from marine proxy records over the same time interval. Our findings therefore more properly place bounds on the magnitude and duration of temperature change on land during this critical interval—the main setting for the demise of nonavian dinosaurs and the rise of mammals.

dc.format.extent486-490
dc.languageen
dc.publisherGeological Society of America
dc.subject37 Earth Sciences
dc.subject3709 Physical Geography and Environmental Geoscience
dc.subject3705 Geology
dc.titleSteady decline in mean annual air temperatures in the first 30 k.y. after the Cretaceous-Paleogene boundary
dc.typejournal-article
dc.typeArticle
plymouth.author-urlhttps://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:001007196700014&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=11bb513d99f797142bcfeffcc58ea008
plymouth.issue5
plymouth.volume51
plymouth.publication-statusPublished
plymouth.journalGeology
dc.identifier.doi10.1130/g50588.1
plymouth.organisational-group|Plymouth
plymouth.organisational-group|Plymouth|Research Groups
plymouth.organisational-group|Plymouth|Faculty of Science and Engineering
plymouth.organisational-group|Plymouth|Faculty of Science and Engineering|School of Geography, Earth and Environmental Sciences
plymouth.organisational-group|Plymouth|Research Groups|Marine Institute
plymouth.organisational-group|Plymouth|REF 2021 Researchers by UoA
plymouth.organisational-group|Plymouth|Users by role
plymouth.organisational-group|Plymouth|Users by role|Academics
plymouth.organisational-group|Plymouth|REF 2021 Researchers by UoA|UoA07 Earth Systems and Environmental Sciences
plymouth.organisational-group|Plymouth|Users by role|Researchers in ResearchFish submission
dcterms.dateAccepted2023-01-18
dc.date.updated2023-08-07T10:04:33Z
dc.rights.embargodate2023-8-8
dc.identifier.eissn1943-2682
dc.rights.embargoperiodforever
rioxxterms.versionofrecord10.1130/g50588.1


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