Sulfide minerals in mantle xenoliths from the Kurose reef, Fukuoka Prefecture, Japan

Kazuyasu Shindo, Kosei Komuro, Ken Ichiro Hayashi

Research output: Contribution to journalLetter

5 Citations (Scopus)

Abstract

Mineral assemblages of sulfides in the mantle peridotite xenoliths embedded in the alkali basalts of the Kurose reef, northern Kyushu, Japan and the chemical compositions of the mineral assemblages are described. Sulfides occur as 1) inclusions and 2) interstitial sulfides in olivine or pyroxene. The mineral assemblages of sulfides that occur as inclusions are pentlandite, pentlandite + chalcopyrite, pentlandite + bornite, monosulfide solid solution (mss) + chalcopyrite ± pentlandite, pentlandite + pyrrhotite, and millerite; and the mineral assemblage of sulfides as interstitial sulfides is pyrrhotite + pentlandite + chalcopyrite. The contents of Ni, Fe, and S in pentlandite are 22.91-33.45, 18.77-28.82, and 46.57-48.31 at%, respectively. The chemical composition of mss is variable. On the basis of the crystallization temperature of olivine and/or pyroxene and the phase relationship between the Fe-Ni-S and the Fe-Cu-S systems, it can be inferred that the mineral assemblage of mss + chalcopyrite ± pentlandite found in olivine is considered to have been initially trapped as a solid-phase Cu-bearing mss and that the other mineral assemblages were trapped as a sulfide liquid. The diversity of mineral assemblages of sulfides in the mantle peridotite xenoliths and the various chemical compositions of the mineral assemblages are due to timing of differential crystallization of mss and its capture in silicate minerals. It can also be inferred that the chemical composition of the initial sulfide liquid in the Kurose lherzolite is the S-poor portion of the Cu-bearing mss. This suggests that initial sulfide liquids in the upper mantle might have similar compositions.

Original languageEnglish
Pages (from-to)182-187
Number of pages6
JournalJournal of Mineralogical and Petrological Sciences
Volume104
Issue number3
DOIs
Publication statusPublished - Jun 1 2009

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reefs
pentlandite
sulfides
Japan
Earth mantle
reef
minerals
sulfide
mantle
solid solution
mineral
solid solutions
chalcopyrite
chemical composition
olivine
pyrrhotite
peridotite
pyroxene
liquid
interstitials

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Geology

Cite this

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title = "Sulfide minerals in mantle xenoliths from the Kurose reef, Fukuoka Prefecture, Japan",
abstract = "Mineral assemblages of sulfides in the mantle peridotite xenoliths embedded in the alkali basalts of the Kurose reef, northern Kyushu, Japan and the chemical compositions of the mineral assemblages are described. Sulfides occur as 1) inclusions and 2) interstitial sulfides in olivine or pyroxene. The mineral assemblages of sulfides that occur as inclusions are pentlandite, pentlandite + chalcopyrite, pentlandite + bornite, monosulfide solid solution (mss) + chalcopyrite ± pentlandite, pentlandite + pyrrhotite, and millerite; and the mineral assemblage of sulfides as interstitial sulfides is pyrrhotite + pentlandite + chalcopyrite. The contents of Ni, Fe, and S in pentlandite are 22.91-33.45, 18.77-28.82, and 46.57-48.31 at{\%}, respectively. The chemical composition of mss is variable. On the basis of the crystallization temperature of olivine and/or pyroxene and the phase relationship between the Fe-Ni-S and the Fe-Cu-S systems, it can be inferred that the mineral assemblage of mss + chalcopyrite ± pentlandite found in olivine is considered to have been initially trapped as a solid-phase Cu-bearing mss and that the other mineral assemblages were trapped as a sulfide liquid. The diversity of mineral assemblages of sulfides in the mantle peridotite xenoliths and the various chemical compositions of the mineral assemblages are due to timing of differential crystallization of mss and its capture in silicate minerals. It can also be inferred that the chemical composition of the initial sulfide liquid in the Kurose lherzolite is the S-poor portion of the Cu-bearing mss. This suggests that initial sulfide liquids in the upper mantle might have similar compositions.",
author = "Kazuyasu Shindo and Kosei Komuro and Hayashi, {Ken Ichiro}",
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Sulfide minerals in mantle xenoliths from the Kurose reef, Fukuoka Prefecture, Japan. / Shindo, Kazuyasu; Komuro, Kosei; Hayashi, Ken Ichiro.

In: Journal of Mineralogical and Petrological Sciences, Vol. 104, No. 3, 01.06.2009, p. 182-187.

Research output: Contribution to journalLetter

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AB - Mineral assemblages of sulfides in the mantle peridotite xenoliths embedded in the alkali basalts of the Kurose reef, northern Kyushu, Japan and the chemical compositions of the mineral assemblages are described. Sulfides occur as 1) inclusions and 2) interstitial sulfides in olivine or pyroxene. The mineral assemblages of sulfides that occur as inclusions are pentlandite, pentlandite + chalcopyrite, pentlandite + bornite, monosulfide solid solution (mss) + chalcopyrite ± pentlandite, pentlandite + pyrrhotite, and millerite; and the mineral assemblage of sulfides as interstitial sulfides is pyrrhotite + pentlandite + chalcopyrite. The contents of Ni, Fe, and S in pentlandite are 22.91-33.45, 18.77-28.82, and 46.57-48.31 at%, respectively. The chemical composition of mss is variable. On the basis of the crystallization temperature of olivine and/or pyroxene and the phase relationship between the Fe-Ni-S and the Fe-Cu-S systems, it can be inferred that the mineral assemblage of mss + chalcopyrite ± pentlandite found in olivine is considered to have been initially trapped as a solid-phase Cu-bearing mss and that the other mineral assemblages were trapped as a sulfide liquid. The diversity of mineral assemblages of sulfides in the mantle peridotite xenoliths and the various chemical compositions of the mineral assemblages are due to timing of differential crystallization of mss and its capture in silicate minerals. It can also be inferred that the chemical composition of the initial sulfide liquid in the Kurose lherzolite is the S-poor portion of the Cu-bearing mss. This suggests that initial sulfide liquids in the upper mantle might have similar compositions.

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