title: Prevailing oxic environments in the Pacific Ocean during the mid-Cretaceous Oceanic anoxic event 2.
abstract: The occurrence of Oceanic Anoxic Event 2 (OAE2) 94 million years ago is considered to be one of the largest carbon cycle perturbations in the Earth's history. The marked increase in the spatial extent of the anoxic conditions in the world's oceans associated with OAE2 resulted in the mass accumulation of organic-rich sediments. Although extensive oceanographic studies of OAE2 have been undertaken in the Atlantic Ocean, the Tethys Sea, and the epicontinental seas of Europe and America, little is known about OAE2 in the Pacific Ocean. Here, we present high-resolution carbon-isotope and degree of pyritization (DOP) data from marine sequences that formed along the continental margins of North America and Asia below the northeastern and northwestern Pacific Ocean. The predominance of low DOP values in these areas revealed that the continental margins of the Pacific Ocean were oxic for most of the OAE2 interval.
authors.affiliation: The Center for Academic Resources and Archives Tohoku University Museum, Tohoku University, Aoba-ku, Sendai 980-8578, Japan. rtaka@m.tohoku.ac.jp
authors.forename: Reishi
authors.initials: R
authors.lastname: Takashima
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Nishi
authors.forename: Toshiro
authors.initials: T
authors.lastname: Yamanaka
authors.forename: Takashige
authors.initials: T
authors.lastname: Tomosugi
authors.forename: Allan G
authors.initials: AG
authors.lastname: Fernando
authors.forename: Kazushige
authors.initials: K
authors.lastname: Tanabe
authors.forename: Kazuyoshi
authors.initials: K
authors.lastname: Moriya
authors.forename: Fumihisa
authors.initials: F
authors.lastname: Kawabe
authors.forename: Keiichi
authors.initials: K
authors.lastname: Hayashi
mesh_terms: D000693:Anaerobiosis; D001208:Asia; D001267:Atlantic Ocean; D057486:Carbon Cycle; D002247:Carbon Isotopes / Q000737:chemistry; D005060:Europe; D005580:Fossils; D019015:Geologic Sediments; D055593:Geological Phenomena; D009656:North America; D010084:Oxidation-Reduction; D010100:Oxygen / Q000378:metabolism; D010140:Pacific Ocean
chemical_list: D002247:Carbon Isotopes; D010100:Oxygen