Formation time of the Ni-bearing norite-cortlandite association of East Asia

Konnikov, E. G.; Чубаров, В. М.; Травин, А. В.; Matukov, D. I.; Sidorov, Evgeny G.

doi:10.1134/s0016702906050090

Cited by 4 publications

(12 citation statements)

References 3 publications

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“…The upper struc tural floor consists of sediments of the Malkinskaya Group with metavolcanics of the Andrianovskaya For mation in its bottom portion. In the upper reaches of the Krutogorova River (Konnikov et al, 2006;Selyagin, 2007;Tararin, 1989), it occurs in tectonic contact (through an overthrust) with schists of the Kamchatka Group.…”

Section: Traits Of the Geodynamic Evolution Of Accretion Zones Affectmentioning

confidence: 99%

“…The displayed results of our numerical simulations are utilized below in interpreting geochemical data on various mafic magmatic rocks in the Central Kamchatka Salient of the Sredinnyi Range. 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).…”

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%

“…The ultramafic rocks found as xenoliths in modern volcanic rocks could have been produced only as cumulates in magmatic chambers. At the same time, the deep Eocene intru sions were brought to the surface as a result of deforma tions at the northern and southern boundaries of the metamorphic complex of the Central Kamchatka Mas sif and are currently accessible to their geological study (Konnikov et al, 2006;Selyangin, 2006Selyangin, , 2007. It is of great theoretical and applied interest to use available data to elucidate the mechanisms that have produced the mafic magmas that were parental for the cortland ite-gabbro-norite intrusions in an environment of an active continental margin.…”

Section: Introductionmentioning

confidence: 99%

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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: Traits Of the Geodynamic Evolution Of Accretion Zones Affectmentioning

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%

Section: Introductionmentioning

confidence: 99%

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Eocene accretion at Kamchatka and a pulse of mantle plume magmatism

et al. 2015

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Yurchik Massifs in Kamchatka: Age and affiliation to magmatic associations

et al. 2009

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Early Eocene magmatism in the Sredinnyi Range, Kamchatka: Composition and geodynamic aspects

Luchitskaya

Soloviev

2012

Petrology

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Migmatization and granite forming processes were widespread in the southern Sredinnyi Range of the Kamchatka Peninsula in the Early Eocene (at approximately 52 ± 2 Ma). The paper presents data on the composition and genesis of the Early Eocene granitoids. The Malka Rise contains both equigranular per aluminous garnet bearing granites, on the one hand, and migmatites and tonalites and trondhjemites (TTG), on the other. The petrography and petrochemistry of most granites in the Malka Rise in the Sredinnyi Range (high SiO 2 concentrations, the presence of muscovite and garnet, the proportions of their Al saturation index ), and the composition of biotite in these rocks highlight their similarities with S granites. The character of the REE patterns and the Sr and Y concentrations suggest that the granites and TTG were formed via the melting of sources of two types: metasediments and metabasites. The metasedimentary nature of the protolith of most of the granitoids also follows from similarities between the REE patterns of the granitoids and host metaterrigenous rocks of the Kolpakova and Kamchatka groups. The variations in the Rb/Ba and Rb/Sr ratios of the granites imply that their protoliths could be sedimentary rocks both depleted and enriched in pelite components. The facts that, along with S granites, some of the granites are TTG, which likely had mafic protoliths, make the Early Eocene granites generally similar to S granites of the Cordilleran type. The collision of the AchaivayamValaginskii ensimatic island arc with the Kamchatka margin of Eurasia started at 55-53 Ma and predated Early Eocene magmatism. In the course of this collision, arc complexes were obducted over continental mar ginal rocks, and this resulted in their rapid subsidence, crustal heating, magma generation, and the derivation of the granites, tonalites, and trondhjemites at 52 ± 2 Ma at temperatures of 645-815°C. This rapid heating (duirng no more than 3-5 Ma) required an additional heat source, which was likely the mantle. The latter heated the bottom of the crust at the detachment of the slab. The influx of mantle material resulted in intru sions of the norite-cortlandite association, which was coeval with the granites and was accompanied by CuNi sulfide mineralization. The composition of the granitoids and data on the intrusions of the norite-cort landite association suggest that mantle material was involved in Early Eocene syncollisional magma genera tion in Kamchatka. Newly obtained U-Pb zircon SHRIMP dates of the granitoids and recently published data on the age of the norite-cortlandite intrusions indicate that they are coeval and make it possible to rec ognize an Early Eocene phase of magmatic activity in Kamchatka. 2 Km Kl An Khv Khm Khz Kr Ir Fig. 3. Schematic chart showing age and structural relations between geological complexes in the southern Sredinnyi Range in Kamchatka (see text for the age of stratigraphic units). Neoautochthon: Br-terrigenous deposits of the Baraba Formation; allochthon: Kr-volcanic and volcanisedimentary de...

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Formation time of the Ni-bearing norite-cortlandite association of East Asia

Cited by 4 publications

References 3 publications

Eocene accretion at Kamchatka and a pulse of mantle plume magmatism

Eocene accretion at Kamchatka and a pulse of mantle plume magmatism

Yurchik Massifs in Kamchatka: Age and affiliation to magmatic associations

Early Eocene magmatism in the Sredinnyi Range, Kamchatka: Composition and geodynamic aspects

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