Articles | Volume 11, issue 1
Research article
07 Jan 2020
Research article |  | 07 Jan 2020

Alkali basalt from the Seifu Seamount in the Sea of Japan: post-spreading magmatism in a back-arc setting

Tomoaki Morishita, Naoto Hirano, Hirochika Sumino, Hiroshi Sato, Tomoyuki Shibata, Masako Yoshikawa, Shoji Arai, Rie Nauchi, and Akihiro Tamura

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Subject area: Tectonic plate interactions, magma genesis, and lithosphere deformation at all scales | Editorial team: Geochemistry, mineralogy, petrology, and volcanology | Discipline: Petrology
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Cited articles

Allan, J. F. and Gorton, M. P.: Geochemistry of Igneous Rocks from Legs 127 and 128, Sea of Japan, in: Proceedings of the Ocean Drilling Program, Ocean Drilling Program, Sci. Results, 127/128, 905–929, 1992. 
Basu, A. R., Junwen, W., Wankang, H., Guanghong, X., and Tatsumoto, M.: Major element, REE, and Pb, Nd and Sr isotopic geochemistry of Cenozoic volcanic rocks of eastern China: implications for their origin from suboceanic-type mantle reservoirs, Earth Planet. Sc. Lett., 105, 149–169,, 1991. 
Choi, S. H., Mukasa, S. B., Kwon, S., and Andronikov, A. V: Sr, Nd, Pb and Hf isotopic compositions of late Cenozoic alkali basalts in South Korea: Evidence for mixing between the two dominant asthenospheric mantle domains beneath East Asia, Chem. Geol., 232, 134–151,, 2006. 
Chung, S.: Trace Element and Isotope Characteristics of Cenozoic Basalts around the Tanlu Fault with Implications for the Eastern Plate Boundary between North and South China, J. Geol., 107, 301–312,, 1999. 
Cousens, B. L. and Allan, J. F.: A Pb,Sr,Nd isotopic study of basaltic rocks from the sea of japan, legs 127/128, Proc. Ocean Drill. Program, Sci. Results, 127, 805–817, 1992. 
Short summary
We report a peridotite xenolith-bearing basalt dredged from the Seifu Seamount (SSM basalt) in the northeast Tsushima Basin, southwest Sea of Japan, which is one of the western Pacific back-arc basin swarms. An 40Ar / 39Ar plateau age of 8.33 ± 0.15 Ma (2 σ) was obtained for the SSM basalt, indicating that it erupted shortly after the termination of back-arc spreading. The SSM basalt was formed in a post-back-arc extension setting by the low-degree partial melting of an upwelling asthenosphere.