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Sr-Nd-Pb isotopic compositions of submarine alkali basalts recovered from the South Korea Plateau, East Sea

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Title
Sr-Nd-Pb isotopic compositions of submarine alkali basalts recovered from the South Korea Plateau, East Sea
Other Titles
동해 남한국대지에서 회수한 해저현무암의 Sr-Nd-Pb 동위원소 조성
Authors
Kap-Sik Jeong
Jin-Hyung Cho
Choo, Mi Kyung
Sung-Tack Kwon
Lee, Jong Ik
Lee, Mi Jung
Seong-Ryul Kim
Subject
Geology
Keywords
DUPAL; OIB; South Korea Plateau; Sr-Nd-Pb isotope; dreged basalt
Issue Date
2011
Publisher
한국지질과학협의회
Citation
Kap-Sik Jeong, et al. 2011. "Sr-Nd-Pb isotopic compositions of submarine alkali basalts recovered from the South Korea Plateau, East Sea". GEOSCIENCES JOURNAL, 15: 149-160.
Abstract
We present geochemical and isotope results (Sr, Nd, Pb) on submarine basalts dredged from the southeastern margin of the South Korea Plateau. The present data are the first geochemical result obtained on submarine basaltic lavas recovered from the Korea Plateau, which is considered to be one of rifted remnants of continent in the East Sea (Sea of Japan) and partially segmented from the Korean Peninsula. The South Korea Plateau basalts (SKPB) show alkali affinities and are characterized by Ocean Island Basalts (OIB)-like trace element compositions relatively enriched in Ba, Nb and Pb. They display relatively flatter [(Ce/Yb)n = 4.49~5.46] and less fractionated HREE [(Dy/Yb)n = 1.11~1.29] patterns compared to average OIB, implying that the SKPB were derived from a relatively shallower mantle depth with a larger degree of partial melting. The Sr, Nd and Pb isotopic compositions of the SKPB display a range of values for 87Sr/86Sr (0.70378 to 0.70409), 143Nd/144Nd (0.512846 to 0.512860) and 206Pb/ 204Pb (17.88?18.44). They show a considerably high range of 207Pb/ 204Pb (15.48?15.62) and 208Pb/204Pb (37.86?38.46) values, indicating the involvement of a DUPAL-like MORB source. According to our two-stage magma mixing model, the isotopic compositions of SKPB can be explained by magma source mixing by the addition of an EMII-like mantle component (up to 2%) to the DUPAL-like MORB source d from the Korea Plateau, which is considered to be one of rifted remnants of continent in the East Sea (Sea of Japan) and partially segmented from the Korean Peninsula. The South Korea Plateau basalts (SKPB) show alkali affinities and are characterized by Ocean Island Basalts (OIB)-like trace element compositions relatively enriched in Ba, Nb and Pb. They display relatively flatter [(Ce/Yb)n = 4.49~5.46] and less fractionated HREE [(Dy/Yb)n = 1.11~1.29] patterns compared to average OIB, implying that the SKPB were derived from a relatively shal
URI
http://repository.kopri.re.kr/handle/201206/6194
DOI
http://dx.doi.org/10.1007/s12303-011-0017-9
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