Eizo Nakamura et al. (1990) Chemical geodynamics in the back-arc region of Japan based on the trace element and Sr-Nd isotopic compositions, Tectonophysics, 174, 207-233, doi: 10.1016/0040-1951(90)90323-Z. < 20150918183244-723863 > pub

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

  • abstract:

    143Nd/144Nd, 87Sr/86Sr , trace and major element results are reported for Cenozoic alkaline basalts and associated tholeiitic basalts from southwestern Japan, and some from Korea and China. Most of the samples plot within the mantle array with ϵNd values ranging from +5.0 to −3.2 and 87Sr/86Sr ratios ranging from 0.7037 to 0.7057.
    The isotopic variations observed along traverse sections of alkaline basalts from the trench to the continental sides of southwestern Japan do not suggest a direct relationship between the subduction of the Philippine Sea and Pacific plates, and the generation of alkaline basalt magmas. However, in southwestern Japan the alkaline basalts do show evidence of a subducted component and are more enriched in the mobile incompatible elements, such as Rb, Ba and K, relative to Chinese and Korean basalts.
    Negative correlations between ϵNd and Sm/Nd and between ϵNd and La/Th, as well as a positive correlation between 87Sr/86Sr and La/Th, are recognized in some of the basalts. These relationships indicate at least two-component magma mixing between (1) magma resulting from a small melting from a depleted mantle and (2) magma resulting from a relatively large amount of melting of an enriched mantle source. It is suggested that the Cenozoic alkaline basalts from southwestern Japan, Korea and China are product of interaction between a MORB-type mantle and a deep mantle plume.
    If the mantle plume has ascended from the upper mantle-lower mantle or core-mantle boundary, the subducted Pacific and Philippine Sea plates could not have extended to southwestern Japan. Had they done so they would have arrested, before they reached the melting zone, the ascent of the plumes that produced the alkaline volcanism in southwestern Japan.

  • doi: 10.1016/0040-1951(90)90323-Z
  • modified at 15 h ago


(a) MSZ-MS_procedure of McCulloch and Perfit (1981) on MSZ mass-spectrometer


(a) XRF_procedure of Norrish and Chappell (1977) on XRF PANalytical PW2400
(b) INAA_procedure of Barnes and Gorton (1984) on INAA (Instrumental Neutron Activation Analysis)
(c) EPMA on EPMA
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
Img 7461@38abd4bb608d8a5c11856e0 thumb 80906-7 < 20121206085409-977-248 >pub
  • IGSN: IEDRM00BE
  • classification: volcanic:basaltic
  • physical-form: hand specimen
  • quantity (kg): 0.5
  • description: Tholeiitic basalt; Nonogashira, Kita-Matsuura District, northwestern Kyushu
  • modified at 2019-07-02
Img 7272 thumb 80903-3 < 20121105083828-238-781 >pub
  • IGSN: IEDRM00BA
  • classification: volcanic:basaltic
  • physical-form: hand specimen
  • quantity (kg): 0.47
  • description: Alkali basalt; Kunimi, Kita-Matsuura District, northwestern Kyushu
  • modified at 2019-07-02
Img 7295 thumb 80916-1 < 20121108084653-359-291 >pub
  • IGSN: IEDRM00BC
  • classification: volcanic:basaltic
  • physical-form: hand specimen
  • quantity (kg): 0.535
  • description: Alkali basalt; Hirado, Kita-Matsuura District, northwestern Kyushu
  • modified at 2019-07-02
Img 7236@43e45c18b393779a368de8a thumb 80814-1 < 20121101085456-226-966 >pub
  • IGSN: IEDRM00B9
  • classification: volcanic:basaltic
  • physical-form: hand specimen
  • quantity (kg): 0.32
  • description: Alkali basalt; Kirigo, Higashi-Matsuura District, northwestern Kyushu
  • modified at 2019-07-02
Img 7265 thumb 80802-6 < 20121105083857-848-594 >pub
  • IGSN: IEDRM00BB
  • classification: volcanic:basaltic
  • physical-form: hand specimen
  • quantity (kg): 0.825
  • description: Alkali basalt; Ishimuro, Higashi-Matsuura District, northwestern Kyushu
  • modified at 2019-07-02
Img 7314@f767c34a3936155efa2d7a7 thumb 80821-3 < 20121114085125-558-275 >pub
  • IGSN: IEDRM00A7
  • classification: volcanic:basaltic
  • physical-form: hand specimen
  • quantity (kg): 0.14
  • age (Ma): 3 (0)
  • description: Olivine-tholeiite basalt lava flow; on a road from Kirigo to mt.Nodakayama; Higashi-Matsuura District, northwestern Kyushu
  • modified at 2019-07-02
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80821-3 pub Micromass VG5400 1 20190513115549-112166
80821-3 pub Shimadzu AA6200 1 20190513115540-734246
80821-3 pub MSZ mass-spectrometer 3 20190514144618-151022
80821-3 pub INAA (Instrumental Neutron Activation Analysis) 14 20190514151019-940605
80821-3 pub XRF PANalytical PW2400 14 20190514150547-697135
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caption ID assembly stone
Table 1. Nd and Sr isotopic compositions for the presented samples pub 20190514145052-207599 Sr-Nd-isotopes (Nakamura et al., 1990) 7
Table 2. Major and trace element abundances and normative compositions pub 20190514153210-412229 major-trace-modal (Nakamura et al., 1990) 7
manual
  • name
  • Eizo Nakamura
  • McCulloch, M. T.
  • Campbell, Ian H.