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

Mi Jung Lee, Jong Ik Lee, Sung Tack Kwon, Mi Kyung Choo, Kap Sik Jeong, Jin Hyung Cho, Seong Ryul Kim

Research output: Contribution to journalArticle

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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 (0512846 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 embedded with endogenous EMI-like material (about 2%).

Original languageEnglish
Pages (from-to)149-160
Number of pages12
JournalGeosciences Journal
Volume15
Issue number2
DOIs
Publication statusPublished - 2011 Jun 1

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alkali basalt
isotopic composition
plateau
basalt
ocean island basalt
mid-ocean ridge basalt
magma
mantle
partial melting
sea
trace element
isotope

All Science Journal Classification (ASJC) codes

  • Environmental Science(all)
  • Earth and Planetary Sciences(all)

Cite this

Lee, Mi Jung ; Lee, Jong Ik ; Kwon, Sung Tack ; Choo, Mi Kyung ; Jeong, Kap Sik ; Cho, Jin Hyung ; Kim, Seong Ryul. / Sr-Nd-Pb isotopic compositions of submarine alkali basalts recovered from the South Korea Plateau, East Sea. In: Geosciences Journal. 2011 ; Vol. 15, No. 2. pp. 149-160.
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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 (0512846 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 embedded with endogenous EMI-like material (about 2{\%}).",
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Sr-Nd-Pb isotopic compositions of submarine alkali basalts recovered from the South Korea Plateau, East Sea. / Lee, Mi Jung; Lee, Jong Ik; Kwon, Sung Tack; Choo, Mi Kyung; Jeong, Kap Sik; Cho, Jin Hyung; Kim, Seong Ryul.

In: Geosciences Journal, Vol. 15, No. 2, 01.06.2011, p. 149-160.

Research output: Contribution to journalArticle

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AU - Lee, Jong Ik

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AB - 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 (0512846 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 embedded with endogenous EMI-like material (about 2%).

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