Alkalic magmatism in the Lyra Basin: A missing link in the late-stage evolution of the Ontong Java Plateau
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Published:May 01, 2015
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Kenji Shimizu, Takashi Sano, Maria Luisa G. Tejada, Hironobu Hyodo, Keiko Sato, Katsuhiko Suzuki, Qing Chang, Masao Nakanishi, 2015. "Alkalic magmatism in the Lyra Basin: A missing link in the late-stage evolution of the Ontong Java Plateau", The Origin, Evolution, and Environmental Impact of Oceanic Large Igneous Provinces, Clive R. Neal, William W. Sager, Takashi Sano, Elisabetta Erba
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The Lyra Basin is believed to be a contiguous part of the Ontong Java Plateau (OJP), based on geophysical studies. Volcaniclastic rocks dredged at two sites in the Lyra Basin document another post-plateau episode of magmatism on the OJP; they are olivine-titanaugite-phyric alkali basalts with as much as ~30% modal phenocrysts. Lyra Basin basalts have compositions that vary from picritic (MgO ~22 wt%) to more evolved (MgO ~5 wt%) and have low SiO2 (41–46 wt%), high TiO2(2–4 wt%), and high Na2O + K2O (1–5 wt%) contents that are distinctly different from tholeiites that...
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The Origin, Evolution, and Environmental Impact of Oceanic Large Igneous Provinces

GeoRef
- absolute age
- Ar/Ar
- basalts
- concentration
- Cretaceous
- geochemistry
- igneous rocks
- large igneous provinces
- magmatism
- major elements
- mantle
- Mesozoic
- metals
- mineral composition
- Ontong Java Plateau
- Pacific Ocean
- rare earths
- trace elements
- Upper Cretaceous
- volcanic rocks
- volcaniclastics
- West Pacific
- Lyra Basin