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Ontong Java Plateau eruption as a trigger for the early Aptian oceanic anoxic event

Maria Luisa G. Tejada, Katsuhiko Suzuki, Junichiro Kuroda, Rodolfo Coccioni, John J. Mahoney, Naohiko Ohkouchi, Tatsuhiko Sakamoto and Yoshiyuki Tatsumi
Ontong Java Plateau eruption as a trigger for the early Aptian oceanic anoxic event
Geology (Boulder) (September 2009) 37 (9): 855-858


The Early Cretaceous Ontong Java Plateau was emplaced at almost the same time as marine biotic changes that culminated in oceanic anoxic event 1 (OAE1a). A causative link between these events has been suggested, but direct evidence has been lacking until now. New Os isotope measurements across the Lower Aptian "Selli Level" black shale deposited during OAE1a in central Italy reveal two negative excursions in marine (super 187) Os/ (super 188) Os ratios within a period of 2 Ma starting above the Barremian-Aptian boundary and ending just above the Selli Level horizon, suggesting an order-of-magnitude increase in the global flux of unradiogenic Os. The results are consistent with early and major phases of eruption of the Ontong Java Plateau. The latter phase is estimated to have been as short as approximately 1 Ma and may have induced widespread oceanic stratification that triggered OAE1a.

ISSN: 0091-7613
EISSN: 1943-2682
Serial Title: Geology (Boulder)
Serial Volume: 37
Serial Issue: 9
Title: Ontong Java Plateau eruption as a trigger for the early Aptian oceanic anoxic event
Affiliation: University of the Philippines, National Institute of Geological Sciences, Quezon City, Philippines
Pages: 855-858
Published: 200909
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 51
Accession Number: 2009-088609
Categories: StratigraphyIsotope geochemistry
Document Type: Serial
Bibliographic Level: Analytic
Annotation: With GSA Data Repository Item 2009207
Illustration Description: strat. col., sketch map
N42°19'60" - N43°40'00", E11°49'60" - E13°15'00"
Secondary Affiliation: Japan Agency for Marine-Earth Science and Technology, JPN, JapanUniversita di Urbino, ITA, ItalyUniversity of Hawaii, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 200948
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