Prevailing oxic environments in the Pacific Ocean during the mid-Cretaceous Oceanic Anoxic Event 2

Reishi Takashima (), Hiroshi Nishi, Toshiro Yamanaka, Takashige Tomosugi, Allan G. Fernando, Kazushige Tanabe, Kazuyoshi Moriya, Fumihisa Kawabe and Keiichi Hayashi
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Reishi Takashima: The Center for Academic Resources and Archives Tohoku University Museum, Tohoku University, Aramaki Aza Aoba 6-3, Aoba-ku, Sendai 980-8578, Japan.
Hiroshi Nishi: The Center for Academic Resources and Archives Tohoku University Museum, Tohoku University, Aramaki Aza Aoba 6-3, Aoba-ku, Sendai 980-8578, Japan.
Toshiro Yamanaka: Okayama University, Tsushimanaka 3-1-1, Kita-ku, Okayama 700-8530, Japan.
Takashige Tomosugi: Hakata Koun Co., Ltd, Kashiihama Futo 4-2-2, Higashi-ku, Fukuoka 813-0016, Japan.
Allan G. Fernando: National Institute of Geological Sciences, University of Philippines, Diliman, Quezon City 1011, Philippines.
Kazushige Tanabe: The University of Tokyo, Hongo 7-3-1, Tokyo 113-0033, Japan.
Kazuyoshi Moriya: School of Education, Waseda University, Nishiwaseda 1-6-1, Shinjuku-ku, Tokyo 169-8050, Japan.
Fumihisa Kawabe: Ministry of Education, Culture, Sports, Science and Technology (MEXT), Kasumigaseki 3-2-2, Chiyoda-ku, Tokyo 100-8959, Japan.
Keiichi Hayashi: Institute of Geology and Paleontology, Graduate School of Science, Tohoku University, Aramaki Aza Aoba 6-3, Aoba-ku, Sendai, 980-8578, Japan.

Nature Communications, 2011, vol. 2, issue 1, 1-5

Abstract: 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.

Date: 2011
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DOI: 10.1038/ncomms1233

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