Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9522664 | Earth and Planetary Science Letters | 2005 | 14 Pages |
Abstract
Negative carbon isotope excursions from a new record of terrestrial organic carbon (δ13Corg = â 2.3â°) and from marine carbonate (δ13Ccarb = â 0.8â°) were used to calculate a methane hydrate release of 1137 Gt of carbon over â¼Â 1 Myr during the early Aptian (Early Cretaceous). We show how the coincident and sudden near-cessation of subduction along the northern boundaries of the Farallon plate resulted in uplift along the continental margin by up to 4.0 km, which may have triggered the release. We conservatively estimated the amount of methane hydrate carbon likely to have been destabilized during the uplift and found it to be within 20% of the amount of carbon implied by the isotopic records within the same â¼Â 1 Myr time frame. Linking subduction-triggered destabilization with isotopic evidence for methane release reveals a plate tectonic mechanism for the incorporation of methane hydrate release into long-term carbon cycling.
Related Topics
Physical Sciences and Engineering
Earth and Planetary Sciences
Earth and Planetary Sciences (General)
Authors
A. Hope Jahren, Clinton P. Conrad, Nan Crystal Arens, German Mora, Carolina Lithgow-Bertelloni,