Cryogenian Glaciation and the Onset of Carbon-Isotope Decoupling

TitleCryogenian Glaciation and the Onset of Carbon-Isotope Decoupling
Publication TypeJournal Article
Year of Publication2010
AuthorsSwanson-Hysell N.L, Rose C.V, Calmet C.C, Halverson G.P, Hurtgen M.T, Maloof A.C
JournalScience
Volume328
Issue5978
Pagination608
Date Published04/2010
Other Numbers21Maloof
Abstract

Global carbon cycle perturbations throughout Earth history are frequently linked to changing paleogeography, glaciation, ocean oxygenation, and biological innovation. A pronounced carbonate carbon-isotope excursion during the Ediacaran Period (635 to 542 million years ago), accompanied by invariant or decoupled organic carbon-isotope values, has been explained with a model that relies on a large oceanic reservoir of organic carbon. We present carbonate and organic matter carbon-isotope data that demonstrate no decoupling from approximately 820 to 760 million years ago and complete decoupling between the Sturtian and Marinoan glacial events of the Cryogenian Period (approximately 720 to 635 million years ago). Growth of the organic carbon pool may be related to iron-rich and sulfate-poor deep-ocean conditions facilitated by an increase in the Fe:S ratio of the riverine flux after Sturtian glacial removal of a long-lived continental regolith.

PDF iconDOWNLOAD PDF

URLhttp://science.sciencemag.org/content/328/5978/608.abstract
DOI10.1126/science.1184508
Short TitleScience