Eizo Nakamura et al. (1989) Chemical geodynamics in a back arc region around the Sea of Japan: Implications for the genesis of alkaline basalts in Japan, Korea, and China, Journal of Geophysical Research, 94, 4634-4654, doi: 10.1029/JB094iB04p04634. < 20150918184659-020057 > pub

Map on Earth or stone. Places and analyses are shown.

  • abstract:

    Major and trace element have been analyzed from alkaline basalts from southwestern Japan, Korea, and northeastern China. No significant differences were found in the immobile incompatible element ratios, such as Zr, Y, Hf, Th, and Ti. These ratios, as well as normalized incompatible element patterns, resemble those of continental and oceanic island alkaline basalts. However, southwestern Japanese alkaline basalts show evidence of K, Ba, and Rb enrichment and a slight depletion in Ta relative to La, implying a weak island arc signature. Korean and Chinese alkaline basalts do not have such a signature. Rare earth elements (REE) show near‐constant La/Sm ratios and a crossover at the high REE end of patterns for each areas studied. The parallelism in light REE can be derived if the magmas are mixtures formed by (1) relatively large degrees of partial melting of an enriched mantle plume from deeper in the mantle and (2) a small degree of partial melting of a depleted mid‐ocean ridge basalt (MORB)‐type source. These observations when combined with seismic results suggest that the upper mantle beneath southwestern Japan has been weakly affected by metasomatism caused by dehydration and/or partial melting of subducted Pacific plate (not Philippine Sea plate). The mantle plume may have reacted with weakly metasomatized MORB‐type depleted mantle to produce alkaline basalt magmas retaining mild island arc characteristics in southwestern Japan. However, the metasomatism by the subduction of the Pacific plate has not affected the mantle beneath Korea and northeastern China. Here the interaction between plume and MORB‐type mantle produced alkaline basalt magma similar to normal continental and oceanic alkaline basalts.

  • doi: 10.1029/JB094iB04p04634
  • modified at 2019-07-02
ISEI/main/127/C/7/Eizo 5000 < 20151020090013-251164 >
20121115084952-303-268 Img 7323@f76c2b8d1ba32f89802c3b0 thumb 80801-4 < 20121115084952-303-268 >pub
  • IGSN: IEDRM009Y
  • classification: volcanic:basaltic
  • physical-form: hand specimen
  • quantity (kg): 0.21
  • description: Alkali basalt; Iwano, Higashi-Matsuura District, northwestern Kyushu
  • modified at 2019-07-02
20121119083824-798-613 Img 7343@ac6e59ae7eeebc9e3bf2058 thumb 80908-7 < 20121119083824-798-613 >pub
  • IGSN: IEDRM009Z
  • classification: volcanic:basaltic
  • physical-form: hand specimen
  • quantity (kg): 0.395
  • description: Northwestern Kyushu
  • modified at 2019-07-02
20121106084911-399-096 Img 7274@f74a7713edfa3c0c0d97845 thumb 80903-4 < 20121106084911-399-096 >pub
  • IGSN: IEDRM009X
  • classification: volcanic:basaltic
  • physical-form: hand specimen
  • quantity (kg): 0.455
  • description: Northwestern Kyushu
  • modified at 2019-07-02
20121206085422-783-661 Img 7463@5003cbe0510c024160a7568 thumb 80821-4 < 20121206085422-783-661 >pub
  • IGSN: IEDRM00A2
  • classification: volcanic:basaltic
  • physical-form: hand specimen
  • quantity (kg): 0.165
  • description: Northwestern Kyushu
  • modified at 2019-07-02
20121206085349-670-603 Img 7458@e7dacc4c942a71eaec95095 thumb 80821-2 < 20121206085349-670-603 >pub
  • IGSN: IEDRM00A1
  • classification: volcanic:basaltic
  • physical-form: hand specimen
  • quantity (kg): 0.71
  • description: Northwestern Kyushu
  • modified at 2019-07-02
20121206085324-833-279 Img 7454@3fcc37cdbe51dc87304c5aa thumb 80901-6 < 20121206085324-833-279 >pub
  • IGSN: IEDRM00A0
  • classification: volcanic:basaltic
  • physical-form: hand specimen
  • quantity (kg): 0.465
  • description: Northwestern Kyushu
  • modified at 2019-07-02
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80903-4 pub INAA (Instrumental Neutron Activation Analysis) 14 20190514114455-642475
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80821-4 pub INAA (Instrumental Neutron Activation Analysis) 14 20190514114456-908588
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caption assembly stone
Table 1. Major and CIPW Norm compositions of alkaline basalts pub XRF+modal abundance (Nakamura et al., 1989) 6
Table 2. Trace element compositions in alkaline basalts pub trace (Nakamura et al., 1989) 6
manual
  • name
  • Eizo Nakamura
  • Campbell, I. H.
  • McCulloch, M. T.
  • Sun, S. -s.