North American continental margin records of the Paleocene‐Eocene thermal maximum: Implications for global carbon and hydrological cycling

摘要: The impacts of the Paleocene-Eocene thermal maximum (PETM) (?55 Ma), one most rapid and extreme warming events in Earth history, are well characterized open marine terrestrial environments but less so on continental margins, a major carbon sink. Here, we present stable isotope, carbonate content, organic matter C:N ratio records through PETM from new outcrop sections California cores previously drilled New Jersey margin. Foraminifer ? 18O data suggest that midlatitude shelves warmed by similar magnitude as ocean (5°C–8°C), while isotope excursion (CIE), recorded both 13C records, is slightly larger (3.3–4.5‰) than documented records. Sediment accumulation rates increase dramatically during CIE marked contrast to sites. In parallel, mass inorganic also increased an order magnitude. estimated total accumulated excess pre-CIE suggests at least along North America, became sinks CIE, mainly because weathering feedbacks rising sea level. This result significant it implies negative feedback role burial margins was greater recognized.