Eutrophication and Deoxygenation Forcing of Marginal Marine Organic Carbon Burial During the PETM.

ABSTRACT: The Paleocene-Eocene Thermal Maximum (PETM) is recognized globally by a negative excursion in stable carbon isotope ratios (δ¹³C) in sedimentary records, termed the carbon isotope excursion (CIE). Based on the CIE, the cause, duration, and mechanisms of recovery of the event have been assessed. Here, we focus on the role of increased organic carbon burial on continental margins as a key driver of CO₂ drawdown and global exogenic δ¹³C during the recovery phase. Using new and previously published sediment proxy data, we show evidence for widespread enhanced primary production, low oxygen waters, and high organic carbon (C_org) burial in marginal and restricted environments throughout the δ¹³C excursion. With a new biogeochemical box model

SUBMITTER: Papadomanolaki NM 

PROVIDER: S-EPMC9310739 | biostudies-literature | 2022 Mar

REPOSITORIES: biostudies-literature