Geochemical specifics of ultrabasic lavas in the Sredinnyi Ridge, Kamchatka

Konnikov, E. G.; Poletaev, V. A.; Zakrevskaya, Olga; Sidorov, Evgeny G.; Ibragimova, E. K.

doi:10.1134/s1028334x1012010x

Cited by 2 publications

(6 citation statements)

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“…The basis of the picrite contains much ore minerals: pyrrho tite (with up to 0.9 wt % Ni), chalcopyrite, Ni pyrite (up to 1 wt % NiO), and titanomagnetite. These rocks are very closely similar to the ultramafic lavas of the Alistorskaya Formation, which we have studied along Southern Kheivan Stream (Konnikov et al, 2010).…”

Section: Geochemistry Of Metamorphosed Ultramafic Rocks In the Upper mentioning

confidence: 97%

“…9. (Sun and McDonough, 1989) REE patterns of (a) metapicrites of the Alistorskaya Formation (Konnikov et al, 2010), metabasites of the Andrianovskaya Formation, (c) metamorphosed ultramafic rocks of the Andri anovskaya Formation.…”

Section: Ree and Trace Element Normalized Patternsmentioning

confidence: 99%

“…Konnikov et al (2006) reported comprehensive information on the composition of Ni bearing cortlan dite in Kamchatka. Data on metamorphosed ultramafic lavas of the Alistorskaya Formation are presented in (Konnikov et al, 2010). For the sake of completeness, we have also analyzed the geochemistry of metamor phosed mafic rocks from the upper reaches of the Kru togorova River on the western slope of the southern Central Kamchatka crystalline massif.…”

Section: Traits Of the Geodynamic Evolution Of Accretion Zones Affectmentioning

confidence: 99%

“…The composition of these rocks will be com pared below with that of mafic rocks that are thought to have been produced via decompressional (plume related) melting. We utilized data on Quaternary hawai ite from the Kekuknai center, Kamchatka, occurrences of intraplate magmatic rocks containing undoubtedly decompressional mantle component (Volynets et al, 2010), Ni bearing cortlandite from the Kuvalorog occurrence of ore mineralization (Konnikov et al, 2006), and metamorphosed ultramafic rocks of the Alistorskaya Formation (Konnikov et al, 2010).…”

Section: Geochemistry Of Metamorphosed Ultramafic Rocks In the Upper mentioning

confidence: 99%

“…Magmatic Ni sulfide deposits and ore occurrences in Kamchatka are related to the complex of cortlanditegabbro-norite intrusions of Early Eocene age (Tararin and Chubarov, 2004;Konnikov et al, 2006), which is referred to as the Dukuk Complex, named after the typomorphic Dukuk layered massif (Sidorov and Stepanov, 2006;Konnikov et al, 2010). Modern Kam chatka is characterized by active volcanism of the island arc type.…”

Section: Introductionmentioning

confidence: 98%

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Eocene accretion at Kamchatka and a pulse of mantle plume magmatism

et al. 2015

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The paper presents newly obtained chemical analyses of metamorphosed mafic volcanic rocks from the upper reaches of the Krutogorova River, southwestern Kamchatka. According to their geochemistry, these mafic rocks and the ore bearing mafic rocks of the cortlandite-gabbro-norite association at the Kuval orog occurrence of Ni mineralization in Kamchatka were produced by melting undepleted mantle at its adi abatic decompression (without involvement of subduction related fluids and melts). The significant crystal lization depths of the small cortlandite-gabbro-norite intrusions are confirmed by our pressure evaluations (P = 8 kbar) by a newly developed amphibole barometer; the crystallization depths of the small subvolcanic intrusions was much shallower. The physical mechanism of derivation of the primitive partial mantle melts is discussed using simple numerical simulations of processes related to the onset of subduction and oceanic slab break off. Geochemical data and results of our numerical simulations testify that the picrobasaltic magmas were generated in ascending flows induced in the upper mantle by complicated geodynamic processes during the accretion of the Achaivaam-Valaginskii island arc to the Eurasian continent in the Eocene.

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Section: Geochemistry Of Metamorphosed Ultramafic Rocks In the Upper mentioning

confidence: 97%

Section: Ree and Trace Element Normalized Patternsmentioning

confidence: 99%

Section: Traits Of the Geodynamic Evolution Of Accretion Zones Affectmentioning

confidence: 99%

Section: Geochemistry Of Metamorphosed Ultramafic Rocks In the Upper mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

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Eocene accretion at Kamchatka and a pulse of mantle plume magmatism

et al. 2015

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Conditions of Early Paleozoic Basaltic and Picritic Magmatism in West Siberia

Симонов

Kontorovich

Kotlyarov

et al. 2020

Russian Geology and Geophysics

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––Geological, petrological, isotope-geochemical (40Ar/39Ar analysis, petrochemical data, and geochemistry of trace elements and REE), and mineralogical researches testify that the formation of the early Paleozoic basalt and picrite complexes of the West Siberian Plate basement was related to the development of the Cambrian subduction zone of the Paleo-Asian Ocean. Using the compositions of clinopyroxenes and amphiboles (and also programs of computational modeling), we have established the Р–Т conditions of formation of early Paleozoic picrite complexes. Crystallization of clinopyroxenes began at significant depths (25–20 km) and at high temperatures (1300–1275 °C). Olivine might have formed at elevated pressures (8–7 kbar) and temperatures of 1540–1490 °C. Amphiboles formed, most likely, at 6.1–4.5 kbar and much lower temperatures, 1105–1060 °C. Petrochemical analysis and data on trace elements and REE in the rocks of the studied early Paleozoic complexes in West Siberia testify to their intricate formation involving magmatic systems with basalt (island arc and back-arc basins), picrite, and shoshonite (and also WPB type) melt characteristics. Taking into account the similar geochemical characteristics of the early Paleozoic basaltoids and picrites of the West Siberian Plate basement and the Kamchatka volcanics, we suggest that a considerable part of the studied ancient complexes formed by the model implying (as in the case of the Sredinnyi Ridge in Kamchatka) the action of enriched magmatic systems during the development of a destructive window (“slab-window”) under rupture of subducted plate on the background of common island arc magmatism.

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Geochemical specifics of ultrabasic lavas in the Sredinnyi Ridge, Kamchatka

Cited by 2 publications

References 1 publication

Eocene accretion at Kamchatka and a pulse of mantle plume magmatism

Eocene accretion at Kamchatka and a pulse of mantle plume magmatism

Conditions of Early Paleozoic Basaltic and Picritic Magmatism in West Siberia

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