Articles | Volume 11, issue 1
https://doi.org/10.5194/se-11-23-2020
https://doi.org/10.5194/se-11-23-2020
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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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, https://doi.org/10.1016/0012-821X(91)90127-4, 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, https://doi.org/10.1016/j.chemgeo.2006.02.014, 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, https://doi.org/10.1086/314348, 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. 
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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.
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