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Paleoclimatic changes across the Cretaceous-Paleogene boundary; geochemical reconstructions from Seymour Island, Antarctica

Charlotte L. O'Brien, Stuart A. Robinson, David B. Kemp, J. Alistair Crame, Jane E. Francis, Daniel J. Lunt, Jon R. Ineson, Rowan J. Whittle and Vanessa Bowman
Paleoclimatic changes across the Cretaceous-Paleogene boundary; geochemical reconstructions from Seymour Island, Antarctica (in Goldschmidt abstracts 2013, Anonymous)
Mineralogical Magazine (2013) 77 (5): 1869

Abstract

The Cretaceous-Paleogene (K-Pg) boundary, approximately 66.0 Ma, marks the most catastrophic global extinction event of the past 100 Myr and is well documented in both terrestrial and marine biotic records. Although the K-Pg mass extinction occurred at a time when the Earth's climate operated under greenhouse conditions, the specific climatic and environmental changes associated with this event remain poorly understood. Shallow marine sediments exposed on Seymour Island, Antarctica (paleolatitude approximately 65 degrees S) provide one of the most expanded K-Pg successions known. Moreover, the high latitudes represent areas of significant climatic importance due to polar amplification of global warming. We first present a low resolution MBT/CBT (methylation of branched tetraethers/cyclisation of branched tetraethers) continental temperature reconstruction that indicates a persistent cool temperate climate (11.4 + or -5 degrees C) on the Antarctic Peninsula during the latest Cretaceous to early Paleogene. The addition of a higher resolution study across the K-Pg boundary is then used to investigate short-term paleoclimatic and paleoenvironmental perturbations, using MBT/CBT, BIT indices and biomarker abundances. Integration of these data with paleontological and paleobotanical datasets allows us to reconstruct the response and recovery of high latitude terrestrial and marine environments to the K-Pg global extinction event.


ISSN: 0026-461X
EISSN: 1471-8022
Serial Title: Mineralogical Magazine
Serial Volume: 77
Serial Issue: 5
Title: Paleoclimatic changes across the Cretaceous-Paleogene boundary; geochemical reconstructions from Seymour Island, Antarctica
Title: Goldschmidt abstracts 2013
Affiliation: University College London, Department of Earth Sciences, London, United Kingdom
Pages: 1869
Published: 2013
Text Language: English
Publisher: Mineralogical Society, London, United Kingdom
Meeting name: Goldschmidt 2013
Meeting location: Florence, ITA, Italy
Meeting date: 20130825Aug. 25-30, 2013
Summary: Y
Accession Number: 2014-034071
Categories: Stratigraphy
Document Type: Serial Conference document
Bibliographic Level: Analytic
S90°00'00" - S61°00'00", W180°00'00" - E180°00'00"
Secondary Affiliation: British Antarctic Survey, GBR, United KingdomUniversity of Leeds, GBR, United KingdomUniversity of Bristol, GBR, United KingdomGeological Survey of Denmark and Greenland, DNK, Denmark
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Mineralogical Society of Great Britain and Ireland
Update Code: 201422
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