TY - JOUR

T1 - Crust–mantle xenoliths from the kharchinsky volcano (Central kamchatka depression): Mineralogy and petrogenesis

AU - Sekisova, V. S.

AU - Smirnov, S. Z.

AU - Kuzmin, D. V.

AU - Shevko, A. Ya

AU - Gora, M. P.

N1 - Funding Information: The field trip and petrographic studies were part of the state task of the Sobolev Institute of Geology and Mineralogy (Novosibirsk). The analytical studies were supported by the Russian Foundation for Basic Research according to research project No. 18-35-00491. The comprehensive re- Publisher Copyright: © 2021, V.S. Sobolev IGM, Siberian Branch of the RAS. Copyright: Copyright 2021 Elsevier B.V., All rights reserved.

PY - 2021/3

Y1 - 2021/3

N2 - 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.

AB - 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.

KW - Clinopyroxenites

KW - Kamchatka

KW - Olivine

KW - Peridotites

KW - Xenoliths

UR - http://www.scopus.com/inward/record.url?scp=85105011212&partnerID=8YFLogxK

UR - https://www.elibrary.ru/item.asp?id=46039249

U2 - 10.2113/RGG20194109

DO - 10.2113/RGG20194109

M3 - Article

AN - SCOPUS:85105011212

VL - 62

SP - 339

EP - 356

JO - Russian Geology and Geophysics

JF - Russian Geology and Geophysics

SN - 1068-7971

IS - 3

M1 - 6

ER -