Contributions to Mineralogy and Petrology

, Volume 162, Issue 1, pp 83–99 | Cite as

Plagioclase zoning as an indicator of magma processes at Bezymianny Volcano, Kamchatka

  • Vasily D. Shcherbakov
  • Pavel Yu. Plechov
  • Pavel E. Izbekov
  • Jill S. Shipman
Original Paper

Abstract

Back-scattered electron (BSE)-derived zoning patterns of plagioclase phenocrysts are used to identify magma processes at Bezymianny Volcano, Kamchatka, based on the 2000–2007 sequence of eruptive products. The erupted magmas are two-pyroxene andesites, which last equilibrated at ~915°C temperature, 77–87 MPa pressure, and a water content of ~1.4 wt%. Textural and compositional zoning of individual plagioclase phenocrysts typically includes a repeated core-to-rim sequence of oscillatory zoning (An50–60) truncated by a dissolution surface followed by an abrupt increase in An content (up to An85), which then gradually decreases rimward. This zoning pattern is interpreted to be the result of frequent replenishments of the magma chamber which cause both thermal and chemical interaction between resident and recharge magmas. The outermost 70- to 150-μm-wide zoning patterns of plagioclase phenocrysts are composed of dissolution surface with a subsequent increase in An and Fe contents. Zoning patterns of the rims exhibit correlation among plagioclase phenocrysts within one eruption. Rims are interpreted as a result of crystallization of a batch of magma in the conduit after recharge event.

Keywords

Plagioclase zoning patterns Bezymianny Volcano Andesite Magma mixing 

Notes

Acknowledgments

We thank Philip Kyle and Alexander and Marina Belousov for provided samples. Ion probe analyses of melt inclusions were conducted under the guidance of Tom Sisson, Charlie Bacon, and Joe Wooden, whose support is highly appreciated. The manuscript was significantly improved following thorough and constructive reviews by Madeleine Humphreys, Philipp Ruprecht, and Jon Blundy. Financial support for this project was provided by NSF program Partnership in International Research and Education OISE 0530278 and section 2.5 of Priority Development Program of Moscow State University.

Supplementary material

410_2010_584_MOESM1_ESM.xls (1.3 mb)
Supplementary material 1 (XLS 1375 kb)
410_2010_584_MOESM2_ESM.pdf (8.2 mb)
Supplementary material 2 (PDF 8365 kb)

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Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  • Vasily D. Shcherbakov
    • 1
  • Pavel Yu. Plechov
    • 1
  • Pavel E. Izbekov
    • 2
  • Jill S. Shipman
    • 2
  1. 1.Faculty of GeologyMoscow State UniversityMoscow, Vorobievy GoryRussia
  2. 2.Geophysical InstituteUniversity of AlaskaFairbanksUSA

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