Sedimentary trace element constraints on the role of North Atlantic Igneous Province volcanism in late Paleocene-early Eocene environmental change

Deborah J. Thomas, Timothy Bralower

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

A growing body of geologic evidence suggests that emplacement of the North Atlantic Igneous Province (NAIP) played a major role in global warming during the early Paleogene as well as in the transient Paleocene-Eocene thermal maximum (PETM) event. A ∼5 million year record of major and trace element abundances spanning 56 to 51 Ma at Deep Sea Drilling Project Sites 401 and 549 confirms that the majority of NAIP volcanism occurred as subaerial flows. Thus the trace element records provide constraints on the nature and scope of the environmental impact of the NAIP during the late Paleocene-early Eocene interval. Subaerial volcanism would have injected mantle CO2 directly into the atmosphere, resulting in a more immediate increase in atmospheric greenhouse gas abundances than CO2 input through submarine volcanism. The lack of significant hydrothermalism contradicts recently proposed mechanisms for thermally destabilizing methane hydrate reservoirs during the PETM. Any connection between NAIP volcanism and PETM warming had to occur through the atmosphere.

Original languageEnglish (US)
Pages (from-to)233-254
Number of pages22
JournalMarine Geology
Volume217
Issue number3-4
DOIs
StatePublished - Jun 15 2005

Fingerprint

igneous province
Trace Elements
Paleocene
volcanism
Hypsithermal
environmental change
Eocene
trace element
Methane
Global warming
Hydrates
Greenhouse gases
Environmental impact
atmosphere
atmospheric gas
Drilling
Deep Sea Drilling Project
Paleogene
global warming
emplacement

All Science Journal Classification (ASJC) codes

  • Oceanography
  • Geology
  • Geochemistry and Petrology

Cite this

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Sedimentary trace element constraints on the role of North Atlantic Igneous Province volcanism in late Paleocene-early Eocene environmental change. / Thomas, Deborah J.; Bralower, Timothy.

In: Marine Geology, Vol. 217, No. 3-4, 15.06.2005, p. 233-254.

Research output: Contribution to journalArticle

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AB - A growing body of geologic evidence suggests that emplacement of the North Atlantic Igneous Province (NAIP) played a major role in global warming during the early Paleogene as well as in the transient Paleocene-Eocene thermal maximum (PETM) event. A ∼5 million year record of major and trace element abundances spanning 56 to 51 Ma at Deep Sea Drilling Project Sites 401 and 549 confirms that the majority of NAIP volcanism occurred as subaerial flows. Thus the trace element records provide constraints on the nature and scope of the environmental impact of the NAIP during the late Paleocene-early Eocene interval. Subaerial volcanism would have injected mantle CO2 directly into the atmosphere, resulting in a more immediate increase in atmospheric greenhouse gas abundances than CO2 input through submarine volcanism. The lack of significant hydrothermalism contradicts recently proposed mechanisms for thermally destabilizing methane hydrate reservoirs during the PETM. Any connection between NAIP volcanism and PETM warming had to occur through the atmosphere.

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