@article{1f63eeb6a3bd426bb1fed27cb1a8600f,
title = "Marine diagenesis of tephra aided the Palaeocene-Eocene Thermal Maximum termination",
abstract = "The Palaeocene-Eocene Thermal Maximum (PETM) was a period of intense global warming that began ∼55.9 million years ago and lasted about 170,000 yrs. Various mechanisms have been proposed to cause this warming, including the emplacement of the North Atlantic Igneous Province (NAIP). Equally, many mechanisms have been invoked to explain sequestration of carbon from the ocean-atmosphere system necessary to promote the recovery to more temperate conditions. Here we propose that an important path for carbon sequestration was tied to NAIP volcanism through the precipitation of calcium carbonate (CaCO3) cements within the tephra layers. These cements formed after the deposition and burial of tephra over a wide area of the North Atlantic Ocean during the late Palaeocene and early Eocene. We find strong evidence that authigenic CaCO3 cements formed shortly after tephra deposition. Monte Carlo simulations suggest that this process may have been responsible for a quarter of the carbon sequestered during the PETM recovery phase, providing a major, but previously unconsidered sink of isotopically-light carbon, and one which may have persisted into the Eocene.",
keywords = "authigenic carbonate, carbon cycle, climate change, PETM, tephra, volcanism",
author = "Jack Longman and Gernon, {Thomas M.} and Palmer, {Martin R.} and Jones, {Morgan T.} and Stokke, {Ella W.} and Svensen, {Henrik H.}",
note = "Funding Information: This work was funded by Natural Environmental Research Council (NERC) grant, NE/K00543X/1. TG was supported by NERC grant, NE/R004978/1, and Turing Institute grant, EP/N510129/1. TG acknowledges the Distinguished Geologists Memorial Fund of the Geological Society of London to sample the Rockall tephras at the IODP Bremen Core Repository (BCR). We are thankful to the staff of the BCR, especially W. Hale, for their assistance, and to B. Hambach, M. Spencer, A. Michalik and A. Milton (University of Southampton), and S. Crowley (University of Liverpool) for laboratory assistance. Bo Schultz (Fur Museum, Denmark), Christian Tegner (Univ. Aarhus), and Sverre Planke (CEED) are thanked for field assistance. MTJ, EWS, and HHS were supported by the Research Council of Norway through its Centres of Excellence funding scheme, project number 223272; while MTJ and EWS were also funded by the Research Council of Norway Unge Forskertalenter project “Ashlantic”, project number 263000. Funding Information: This work was funded by Natural Environmental Research Council ( NERC ) grant, NE/K00543X/1 . TG was supported by NERC grant, NE/R004978/1 , and Turing Institute grant, EP/N510129/1 . TG acknowledges the Distinguished Geologists Memorial Fund of the Geological Society of London to sample the Rockall tephras at the IODP Bremen Core Repository (BCR). We are thankful to the staff of the BCR, especially W. Hale, for their assistance, and to B. Hambach, M. Spencer, A. Michalik and A. Milton (University of Southampton), and S. Crowley (University of Liverpool) for laboratory assistance. Bo Schultz (Fur Museum, Denmark), Christian Tegner (Univ. Aarhus), and Sverre Planke (CEED) are thanked for field assistance. MTJ, EWS, and HHS were supported by the Research Council of Norway through its Centres of Excellence funding scheme, project number 223272 ; while MTJ and EWS were also funded by the Research Council of Norway Unge Forskertalenter project “Ashlantic”, project number 263000 . Publisher Copyright: {\textcopyright} 2021 Elsevier B.V.",
year = "2021",
month = oct,
day = "1",
doi = "10.1016/j.epsl.2021.117101",
language = "English",
volume = "571",
journal = "Earth and Planetary Science Letters",
issn = "0012-821X",
publisher = "Elsevier",
}
