Evolution of melt during the crystallization of the Bele pipe basanites (North Minusa depression)

A. V. Golovin, V. V. Sharygin, V. G. Mal'kovets

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

The paper is devoted to the mineralogy and thermobarogeochemistry of the Bele pipe basanites. We report the chemical composition of phenocrysts (olivine, clinopyroxene, and plagioclase) and minerals of basanite groundmass (olivine, clinopyroxene, magnetite, plagioclase, biotite, apatite, amphibole, etc.). The minimum temperatures of mineral formation were established by the homogenization temperatures of primary melt inclusions. The groundmass minerals crystallized in the sequence: olivine (>1200-1230°C) → clinopyroxene (1100-1160°C) → plagioclase (990-1140°C), magnetite → apatite (1040-1100°C) → biotite, ilmenite, amphibole, (nepheline), K-feldspar. The presence of rhönite as a daughter phase of olivine-hosted melt inclusions is ample evidence of subsurface crystallization of the groundmass minerals (P≤0.6 kbar). Electron microprobe analysis of the homogenized and residual inclusion glasses in the minerals has shown that the evolution of basanitic melt during crystallization had a miaskitic character and was accompanied by its enrichment with SiO2, Al2O3, and alkalies and depletion with mafic components. Oxygen fugacity during the basanite crystallization was higher than the QFM buffer values. Studies of the chemical composition of the largest olivine and clinopyroxene phenocrysts have shown that their cores are possibly relics of disintegrated mantle xenoliths. Zoned phenocrysts of clinopyroxene might have reacted with basanite melt at T≥1210°C, which resulted in "pseudoprimary" inclusions in their cores.

Original languageEnglish
Pages (from-to)1760-1782
Number of pages23
JournalGeologiya i Geofizika
Volume41
Issue number12
Publication statusPublished - 2000
Externally publishedYes

Fingerprint

clinopyroxene
olivine
crystallization
pipe
basanite
melt
mineral
plagioclase
melt inclusion
amphibole
apatite
magnetite
biotite
chemical composition
nepheline
fugacity
ilmenite
electron probe analysis
feldspar
mineralogy

Keywords

  • Basanite
  • Melt evolution
  • Melt inclusions
  • Mineral chemistry
  • Mineralogy
  • Minusa depression
  • Rhönite

ASJC Scopus subject areas

  • Earth and Planetary Sciences (miscellaneous)

Cite this

Golovin, A. V., Sharygin, V. V., & Mal'kovets, V. G. (2000). Evolution of melt during the crystallization of the Bele pipe basanites (North Minusa depression). Geologiya i Geofizika, 41(12), 1760-1782.

Evolution of melt during the crystallization of the Bele pipe basanites (North Minusa depression). / Golovin, A. V.; Sharygin, V. V.; Mal'kovets, V. G.

In: Geologiya i Geofizika, Vol. 41, No. 12, 2000, p. 1760-1782.

Research output: Contribution to journalArticle

Golovin, AV, Sharygin, VV & Mal'kovets, VG 2000, 'Evolution of melt during the crystallization of the Bele pipe basanites (North Minusa depression)', Geologiya i Geofizika, vol. 41, no. 12, pp. 1760-1782.
Golovin, A. V. ; Sharygin, V. V. ; Mal'kovets, V. G. / Evolution of melt during the crystallization of the Bele pipe basanites (North Minusa depression). In: Geologiya i Geofizika. 2000 ; Vol. 41, No. 12. pp. 1760-1782.
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AB - The paper is devoted to the mineralogy and thermobarogeochemistry of the Bele pipe basanites. We report the chemical composition of phenocrysts (olivine, clinopyroxene, and plagioclase) and minerals of basanite groundmass (olivine, clinopyroxene, magnetite, plagioclase, biotite, apatite, amphibole, etc.). The minimum temperatures of mineral formation were established by the homogenization temperatures of primary melt inclusions. The groundmass minerals crystallized in the sequence: olivine (>1200-1230°C) → clinopyroxene (1100-1160°C) → plagioclase (990-1140°C), magnetite → apatite (1040-1100°C) → biotite, ilmenite, amphibole, (nepheline), K-feldspar. The presence of rhönite as a daughter phase of olivine-hosted melt inclusions is ample evidence of subsurface crystallization of the groundmass minerals (P≤0.6 kbar). Electron microprobe analysis of the homogenized and residual inclusion glasses in the minerals has shown that the evolution of basanitic melt during crystallization had a miaskitic character and was accompanied by its enrichment with SiO2, Al2O3, and alkalies and depletion with mafic components. Oxygen fugacity during the basanite crystallization was higher than the QFM buffer values. Studies of the chemical composition of the largest olivine and clinopyroxene phenocrysts have shown that their cores are possibly relics of disintegrated mantle xenoliths. Zoned phenocrysts of clinopyroxene might have reacted with basanite melt at T≥1210°C, which resulted in "pseudoprimary" inclusions in their cores.

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