Crust–Mantle Xenoliths from the Kharchinsky Volcano (Central Kamchatka Depression): Mineralogy and Petrogenesis
| Autor: | S.Z. Smirnov, A. Ya. Shevko, D. V. Kuzmin, M. P. Gora, V.S. Sekisova |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
geography
geography.geographical_feature_category Olivine 010504 meteorology & atmospheric sciences Geochemistry Geology Crust engineering.material 010502 geochemistry & geophysics 01 natural sciences Mantle xenoliths Geophysics Volcano engineering Xenolith 0105 earth and related environmental sciences Petrogenesis |
| Zdroj: | Russian Geology and Geophysics. 62:339-356 |
| ISSN: | 1068-7971 |
| DOI: | 10.2113/rgg20194109 |
| Popis: | —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, anhydrite, 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. |
| Databáze: | OpenAIRE |
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