Warm, not super-hot, temperatures in the early Eocene subtropics

Caitlin R. Keating-Bitonti, Linda C Ivany, Hagit P. Affek, Peter Douglas, Scott Douglas Samson

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Abstract

The early Eocene (ca. 55-48 Ma) encompasses one of the warmest intervals of the past 65 m.y. and is characterized by an unusually low equator-to-pole thermal gradient. Recent proxy studies suggest temperatures well in excess of 30°C even at high latitudes, but confl icting interpretations derived from different types of data leave considerable uncertainty about actual early Eocene temperatures. A robust comparison among new paleotemperature proxies may provide insight into possible biases in their temperature estimates, and additional detail on the spatial distribution of temperatures will further resolve the early Eocene meridional temperature gradient. We use a suite of paleotemperature proxies based on the chemistry of bivalve shell carbonate and associated sedimentary organic matter from the United States Gulf Coastal Plain to constrain climate at a subtropical site during this key interval of Earth history. Oxygen isotope and clumped isotope analyses of shell carbonate and two tetraether lipid analyses of sedimentary organic carbon all yield temperatures of ~27 °C. High-resolution, intraannual oxygen isotope data reveal a consistent, large range of seasonal variation, but clumped isotope data suggest that seasonality is due primarily to precipitation, not to temperature. These paleotemperature estimates are 2-3 °C warmer than the northern Gulf of Mexico today, and generally consistent with early Eocene temperature estimates from other low and mid-latitude locations, but are signifi cantly cooler than contemporaneous estimates from high southern latitudes.

Original languageEnglish (US)
Pages (from-to)771-774
Number of pages4
JournalGeology
Volume39
Issue number8
DOIs
StatePublished - Aug 2011

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Eocene
paleotemperature
temperature
oxygen isotope
isotope
shell
carbonate
coastal plain
temperature gradient
seasonality
bivalve
seasonal variation
lipid
organic carbon
spatial distribution
organic matter
climate
history
gulf

ASJC Scopus subject areas

  • Geology

Cite this

Warm, not super-hot, temperatures in the early Eocene subtropics. / Keating-Bitonti, Caitlin R.; Ivany, Linda C; Affek, Hagit P.; Douglas, Peter; Samson, Scott Douglas.

In: Geology, Vol. 39, No. 8, 08.2011, p. 771-774.

Research output: Contribution to journalArticle

Keating-Bitonti, Caitlin R. ; Ivany, Linda C ; Affek, Hagit P. ; Douglas, Peter ; Samson, Scott Douglas. / Warm, not super-hot, temperatures in the early Eocene subtropics. In: Geology. 2011 ; Vol. 39, No. 8. pp. 771-774.
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