Clinopyroxene and bulk rock Sr–Nd–Hf–Pb isotope compositions of Raivavae ocean island basalts

Does clinopyroxene record early stage magma chamber processes?

Takashi Miyazaki, Takeshi Hanyu, Jun Ichi Kimura, Ryoko Senda, Bogdan Stefanov Vaglarov, Qing Chang, Yuka Hirahara, Toshiro Takahashi, Hiroshi Kawabata, Tomoki Sato

研究成果: ジャーナルへの寄稿記事

4 引用 (Scopus)

抄録

We investigated the Sr–Nd–Hf–Pb isotope compositions of clinopyroxene separates and strongly leached bulk rock powders from the basalt lavas on Raivavae Island in the South Pacific. These data allowed us to explore the magma chamber processes of the two basalt groups: the high-μ-type (μ = 238 U/204Pb, HIMU) Rairua basalts erupted at ~ 9 Ma, and the depleted mantle (DM)-type Anatonu basalts erupted at ~ 6 Ma. We assessed different analytical techniques for clinopyroxene sample treatment, including leaching, sample digestion, chemical separation, and determination of parent/daughter ratios for use in age corrections. The age-corrected initial Sr–Nd–Hf isotope compositions of clinopyroxene samples solely overlap on the bulk rock compositions of each basalt type. The initial Pb isotope compositions show significant differences between the clinopyroxenes and bulk rock samples in both the Rairua and Anatonu basalts. The clinopyroxenes have less radiogenic Pb than their hosts, reflecting the magma chamber processes. The overall variations in the bulk rock Pb isotopes are explained by mixing of melts from the HIMU- and DM-type sources in the plume. In detail, early stage Rairua magma was more influenced by DM melts from which Rairua clinopyroxene was crystallized. Subsequent supply of dominant HIMU melts drove the bulk rock magma chemistry more HIMU-like. The Anatonu DM magma was largely from depleted mantle that differs from the Pacific MORB source. Subordinate contribution of a Pacific alkali-basalt-like component is suggested from the clinopyroxene chemistry of Anatonu perhaps from impregnated pyroxenite in the lithospheric mantle.

元の言語英語
ページ(範囲)18-31
ページ数14
ジャーナルChemical Geology
482
DOI
出版物ステータス出版済み - 4 5 2018

Fingerprint

ocean island basalt
magma chamber
Isotopes
clinopyroxene
basalt
Rocks
isotope
mantle
Chemical analysis
rock
melt
magma chemistry
magma
pyroxenite
alkali basalt
mid-ocean ridge basalt
Alkalies
digestion
analytical method
Powders

All Science Journal Classification (ASJC) codes

  • Geology
  • Geochemistry and Petrology

これを引用

Clinopyroxene and bulk rock Sr–Nd–Hf–Pb isotope compositions of Raivavae ocean island basalts : Does clinopyroxene record early stage magma chamber processes? / Miyazaki, Takashi; Hanyu, Takeshi; Kimura, Jun Ichi; Senda, Ryoko; Vaglarov, Bogdan Stefanov; Chang, Qing; Hirahara, Yuka; Takahashi, Toshiro; Kawabata, Hiroshi; Sato, Tomoki.

:: Chemical Geology, 巻 482, 05.04.2018, p. 18-31.

研究成果: ジャーナルへの寄稿記事

Miyazaki, Takashi ; Hanyu, Takeshi ; Kimura, Jun Ichi ; Senda, Ryoko ; Vaglarov, Bogdan Stefanov ; Chang, Qing ; Hirahara, Yuka ; Takahashi, Toshiro ; Kawabata, Hiroshi ; Sato, Tomoki. / Clinopyroxene and bulk rock Sr–Nd–Hf–Pb isotope compositions of Raivavae ocean island basalts : Does clinopyroxene record early stage magma chamber processes?. :: Chemical Geology. 2018 ; 巻 482. pp. 18-31.
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abstract = "We investigated the Sr–Nd–Hf–Pb isotope compositions of clinopyroxene separates and strongly leached bulk rock powders from the basalt lavas on Raivavae Island in the South Pacific. These data allowed us to explore the magma chamber processes of the two basalt groups: the high-μ-type (μ = 238 U/204Pb, HIMU) Rairua basalts erupted at ~ 9 Ma, and the depleted mantle (DM)-type Anatonu basalts erupted at ~ 6 Ma. We assessed different analytical techniques for clinopyroxene sample treatment, including leaching, sample digestion, chemical separation, and determination of parent/daughter ratios for use in age corrections. The age-corrected initial Sr–Nd–Hf isotope compositions of clinopyroxene samples solely overlap on the bulk rock compositions of each basalt type. The initial Pb isotope compositions show significant differences between the clinopyroxenes and bulk rock samples in both the Rairua and Anatonu basalts. The clinopyroxenes have less radiogenic Pb than their hosts, reflecting the magma chamber processes. The overall variations in the bulk rock Pb isotopes are explained by mixing of melts from the HIMU- and DM-type sources in the plume. In detail, early stage Rairua magma was more influenced by DM melts from which Rairua clinopyroxene was crystallized. Subsequent supply of dominant HIMU melts drove the bulk rock magma chemistry more HIMU-like. The Anatonu DM magma was largely from depleted mantle that differs from the Pacific MORB source. Subordinate contribution of a Pacific alkali-basalt-like component is suggested from the clinopyroxene chemistry of Anatonu perhaps from impregnated pyroxenite in the lithospheric mantle.",
author = "Takashi Miyazaki and Takeshi Hanyu and Kimura, {Jun Ichi} and Ryoko Senda and Vaglarov, {Bogdan Stefanov} and Qing Chang and Yuka Hirahara and Toshiro Takahashi and Hiroshi Kawabata and Tomoki Sato",
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T1 - Clinopyroxene and bulk rock Sr–Nd–Hf–Pb isotope compositions of Raivavae ocean island basalts

T2 - Does clinopyroxene record early stage magma chamber processes?

AU - Miyazaki, Takashi

AU - Hanyu, Takeshi

AU - Kimura, Jun Ichi

AU - Senda, Ryoko

AU - Vaglarov, Bogdan Stefanov

AU - Chang, Qing

AU - Hirahara, Yuka

AU - Takahashi, Toshiro

AU - Kawabata, Hiroshi

AU - Sato, Tomoki

PY - 2018/4/5

Y1 - 2018/4/5

N2 - We investigated the Sr–Nd–Hf–Pb isotope compositions of clinopyroxene separates and strongly leached bulk rock powders from the basalt lavas on Raivavae Island in the South Pacific. These data allowed us to explore the magma chamber processes of the two basalt groups: the high-μ-type (μ = 238 U/204Pb, HIMU) Rairua basalts erupted at ~ 9 Ma, and the depleted mantle (DM)-type Anatonu basalts erupted at ~ 6 Ma. We assessed different analytical techniques for clinopyroxene sample treatment, including leaching, sample digestion, chemical separation, and determination of parent/daughter ratios for use in age corrections. The age-corrected initial Sr–Nd–Hf isotope compositions of clinopyroxene samples solely overlap on the bulk rock compositions of each basalt type. The initial Pb isotope compositions show significant differences between the clinopyroxenes and bulk rock samples in both the Rairua and Anatonu basalts. The clinopyroxenes have less radiogenic Pb than their hosts, reflecting the magma chamber processes. The overall variations in the bulk rock Pb isotopes are explained by mixing of melts from the HIMU- and DM-type sources in the plume. In detail, early stage Rairua magma was more influenced by DM melts from which Rairua clinopyroxene was crystallized. Subsequent supply of dominant HIMU melts drove the bulk rock magma chemistry more HIMU-like. The Anatonu DM magma was largely from depleted mantle that differs from the Pacific MORB source. Subordinate contribution of a Pacific alkali-basalt-like component is suggested from the clinopyroxene chemistry of Anatonu perhaps from impregnated pyroxenite in the lithospheric mantle.

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