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A younger and protracted emplacement of the Ontong Java Plateau
Peter C Davidson1, Anthony A P Koppers1, Takashi Sano2
1College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, Corvallis, OR, USA.
Science (New York, N.Y.)
|June 15, 2023
Summary
The Ontong Java Plateau
Area of Science:
- Geoscience, Paleoceanography, Volcanology
Background:
- The Ontong Java Plateau's (OJP) submarine volcanic emplacement is linked to Ocean Anoxic Event 1a (OAE 1a).
- Previous research lacked precise dating for OJP formation and relied on sedimentary proxies for its OAE 1a connection.
Purpose of the Study:
- To refine the eruptive history and timing of the Ontong Java Plateau.
- To reassess the causal link between OJP emplacement and Ocean Anoxic Event 1a.
Main Methods:
- High-precision 40Ar/39Ar geochronology was performed on samples from OJP drill and dredge sites.
Main Results:
- New 40Ar/39Ar dates indicate OJP formation occurred over at least 6 million years.
- These ages are up to 10 million years younger than previously established dates.
- The revised timing suggests OJP is too young to be the primary cause of OAE 1a.
Conclusions:
- The Ontong Java Plateau's protracted formation challenges its role in OAE 1a but suggests a potential link to the later OAE 1b.
- The findings have implications for understanding the emplacement dynamics of large igneous provinces.
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