Hanyu, Takeshi & Nakamura, Eizo (2000) Constraints on HIMU and EM by Sr and Nd isotopes re-examined, Earth, Planets and Space, 52, 61-70, doi: 10.1186/BF03351614. < 20200212123758-372132 > pub

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

  • abstract:

    Sr and Nd isotopes together with trace elements for ocean island basalts in the Polynesian region have been analyzed in order to investigate the origin of the HIMU and EM sources. Both whole rocks and cpx phenocrysts were analyzed for isotopic composition. Cpx samples from HIMU islands show quite uniform 87Sr/86Sr ratios (∼0.70274), while leached and unleached whole rock samples show variable and higher 87Sr/86Sr than those of cpx samples. These results suggest that even leached whole rock samples have been affected by secondary contaminations of sea water. On the other hand, cpx preserves a pristine isotopic signature with minimal secondary effects.
    Using only the cpx analyses, HIMU form a vertical linear trend in the Sr-Nd isotope diagram with small variation in εNd (+3.3∼+5.5) and constant 87Sr/86Sr. This trend is explained by a mixing of the HIMU end-member and the MORB source. Since εNd of the HIMU end-member is constrained to be less than +3.3, the HIMU source should include former sediment added to oceanic crust. To explain the vertical nature of the mixing trend, the HIMU end-member should have similar Rb/Sr to the MORB source, or much lower Sr/Nd ratio than the MORB source, which favors a mixing model between extensively dehydrated oceanic crust and sediment as the HIMU source. The correlation between εNd and trace element ratios such as Pb/Ta also supports the model.

  • doi: 10.1186/BF03351614
  • modified at 17 h ago
Tixhr1603871023 thumb RTG-C5 < 20160809140217-350661 >pub
  • classification: volcanic:basaltic
  • physical-form: thin section
  • status: (unknown)
  • description: Polynesian region; Cook-Austral Archipelago; Rarotonga Island; EM1 alkali basalt
  • modified at 2020-02-12
Tixhr 511455209 thumb RTG-C8 < 20160809140328-681370 >pub
  • classification: volcanic:basaltic
  • physical-form: thin section
  • status: (unknown)
  • description: Polynesian region; Cook-Austral Archipelago; Rarotonga Island; EM1 alkali basalt
  • modified at 2020-02-12
Tixhr995210407 thumb MGA-C8 < 20160809140542-250787 >pub
  • classification: volcanic:basaltic
  • physical-form: thin section
  • status: (unknown)
  • description: Polynesian region; Cook-Austral Archipelago; Mangaia Island; HIMU basalt; age is around 18 Ma
  • modified at 2020-02-12
Tixhr 1099655598 thumb RU09-01 < 20160809141727-086822 >pub
  • classification: volcanic:basaltic
  • physical-form: thin section
  • status: (unknown)
  • description: Polynesian region; Cook-Austral Archipelago; Rurutu Island; HIMU basalt; age is around 12 Ma
  • modified at 2020-02-12
Tixhr1450183329 thumb RTG-C10 < 20160809140434-617306 >pub
  • classification: volcanic:basaltic
  • physical-form: thin section
  • status: (unknown)
  • description: Polynesian region; Cook-Austral Archipelago; Rarotonga Island; EM1 alkali basalt
  • modified at 2020-02-12
Tixhr 967964796 thumb MGA-C12 < 20160809140645-908505 >pub
  • classification: volcanic:basaltic
  • physical-form: thin section
  • status: (unknown)
  • description: Polynesian region; Cook-Austral Archipelago; Mangaia Island; HIMU basalt; age is around 18 Ma
  • modified at 2020-02-12
Tixhr1543551837 thumb MGA-C23 < 20160809140743-199781 >pub
  • classification: volcanic:basaltic
  • physical-form: thin section
  • status: (unknown)
  • description: Polynesian region; Cook-Austral Archipelago; Mangaia Island; HIMU basalt; age is around 18 Ma
  • modified at 2020-02-12
Tixhr333642501 thumb MGA-C29 < 20160809140833-565014 >pub
  • classification: volcanic:basaltic
  • physical-form: thin section
  • status: (unknown)
  • description: Polynesian region; Cook-Austral Archipelago; Mangaia Island; HIMU basalt; age is around 18 Ma
  • modified at 2020-02-12
Tixhr219889006 thumb TU09-01 < 20160809141141-791044 >pub
  • classification: volcanic:basaltic
  • physical-form: thin section
  • status: (unknown)
  • description: Polynesian region; Cook-Austral Archipelago; Tubuai Island; HIMU basalt; age is around 10 Ma
  • modified at 2020-02-12
Tixhr1077711417 thumb TU12-01 < 20160809141238-283398 >pub
  • classification: volcanic:basaltic
  • physical-form: thin section
  • status: (unknown)
  • description: Polynesian region; Cook-Austral Archipelago; Tubuai Island; HIMU basalt; age is around 10 Ma
  • modified at 2020-02-12
Tixhr 1520382641 thumb RU01-01 < 20160809141449-846653 >pub
  • classification: volcanic:basaltic
  • physical-form: thin section
  • status: (unknown)
  • description: Polynesian region; Cook-Austral Archipelago; Rurutu Island; HIMU basalt; age is around 12 Ma
  • modified at 2020-02-12
Tixhr254969739 thumb RTG-C4 < 20160809140012-027425 >pub
  • classification: volcanic:basaltic
  • physical-form: thin section
  • status: (unknown)
  • description: Polynesian region; Cook-Austral Archipelago; Rarotonga Island; EM1 alkali basalt
  • modified at 2020-02-12
Tixhr2136490234 thumb TU01-01 < 20160809140946-111959 >pub
  • classification: volcanic:basaltic
  • physical-form: thin section
  • status: (unknown)
  • description: Polynesian region; Cook-Austral Archipelago; Tubuai Island; HIMU basalt; age is around 10 Ma
  • modified at 2020-02-12
Tixhr1789830867 thumb RU02-01 < 20160809141540-374957 >pub
  • classification: volcanic:basaltic
  • physical-form: thin section
  • status: (unknown)
  • description: Polynesian region; Cook-Austral Archipelago; Rurutu Island; HIMU basalt; age is around 12 Ma
  • modified at 2020-02-12
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name spots global-id
caption ID assembly stone
Table 2. Trace element concentrations of whole rock and Cpx samples pub 20200213103303-708202 trace (Hanyu et al., 2000) 30
Table 1. Results of the Sr and Nd isotope alalyses in Cpx and whole rock samples pub 20200212150744-471043 Sr-Nd-isotopes (Nakamura et al., 1990) 33
manual
  • name
  • Hanyu, Takeshi
  • Nakamura, Eizo