Корово-мантийные ксенолиты: минералогия и петрогенезис

Translated title of the contribution: Crust–mantle xenoliths from the kharchinsky volcano (Central kamchatka depression): Mineralogy and petrogenesis

Research output: Contribution to journalArticlepeer-review

Abstract

– We present results of a study of plutonic-rock xenoliths from the Kharchinsky Volcano (Central Kamchatka depression). The studied xenolith collection comprises nine samples of peridotites and clinopyroxenites. The peridotites are identified as wehrlites, dunites, and harzburgites composed of olivine, clino-and orthopyroxenes, amphibole, and chromite in varying amounts. The clinopyroxenites consist mostly of clinopyroxene and often contain subordinate olivine, amphibole, hercynite, and magnetite. The xenoliths have interstitial segregations and veins composed of chlorite, plagioclase, K-feldspar, orthopyroxene, barite, fluorapatite, ilmenite, and, more seldom, an-hydrite, phlogopite, and some other minerals. The study has revealed that veinlet minerals sometimes replace primary minerals and form pseudomorphs, thus indicating the metasomatic origin of interstitial and vein mineral assemblages. The thermobarometric calculations for minerals have shown that peridotites formed at ~1140 °C and ≤10 kbar in the intermediate chambers at the depths from the spinel stability field to the Moho. Interstitial metasomatic alterations of rocks took place at ~400–850 °C.
Translated title of the contributionCrust–mantle xenoliths from the kharchinsky volcano (Central kamchatka depression): Mineralogy and petrogenesis
Original languageRussian
Article number6
Pages (from-to)422-442
Number of pages21
JournalГеология и геофизика
Volume62
Issue number3
DOIs
Publication statusPublished - Mar 2021

OECD FOS+WOS

  • 1.05 EARTH AND RELATED ENVIRONMENTAL SCIENCES
  • 1.05.KY GEOLOGY
  • 1.05.GC GEOCHEMISTRY & GEOPHYSICS

State classification of scientific and technological information

  • 38 GEOLOGY

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