Age of the magmatic and metamorphic processes in the vodlozero complex, Baltic shield: An ion microprobe (SHRIMP II) U-Th-Pb isotopic study of zircons

Сергеев, С. А.; Bibikova, Elena; Matukov, D. I.; Лобач-Жученко, С. Б.

doi:10.1134/s0016702907020097

Cited by 18 publications

(8 citation statements)

References 3 publications

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“…The study method described in [35] is analogous to the standard method of ion microanalysis of zircons elab orated at the Australian National University for SHRIMP II [57]. The uncertainties in the determina tion of the 206 Pb/ 238 U age of the zircon populations are no more than 2%.…”

Section: Methodsmentioning

confidence: 99%

U-Pb SHRIMP dating of zircons from metamorphic complexes in eastern Kamchatka

Tararin

Badredinov

Markovsky

et al. 2012

Russ. J. of Pac. Geol.

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The metamorphic complexes of eastern Kamchatka exposed on the Khavyven Highland and Karaginsky Island, as well as on the Kamchatka and Ozernoi peninsulas, compose large (up to 1.5 km) elon gated blocks spatially associated with ophiolitic peridotite and gabbroic rock bodies (the Khavyven Highland and Karaginsky Island) or make up isolated fragments and blocks among serpentinite melange (the Ozernoi and Kamchatka peninsulas). The degree of metamorphism of the primary rocks varies from the green schist/amphibolite boundary facies (Karaginsky Island and the Khavyven Highland) to the high pressure amphibolite facies (the Ozernoi and Kamchatka peninsulas). Our first U-Pb SHRIMP zircon data on the metamorphic and igneous rocks in eastern Kamchatka and the analysis of previous studies testify to two time intervals of the manifestation of metamorphism in the studied region. The first stage of metamorphism (80-75 Ma) coincides with the formation of the ophiolitic gabbro and peridotites (100-70 Ma) that compose the eastern Kamchatka ophiolite zone. The metamorphic rocks of this stage comprise fragments and blocks in the serpentinite melange (the Kamchatka and Ozernoi penin sulas). They are represented by high pressure (up to 8-10 kb) garnet amphibolites related to the rocks of the ophiolite association (gabbro, basalts, tuffs, and siliceous rocks). The second stage of magmatism and subse quent metamorphism embraces the time interval of 70-50 Ma. This stage is associated with the formation of vol canics of the tholeiitic, calc alkaline, and subalkaline series, zonal gabbro-peridotite intrusions (70-60 Ma, and metamorphism of moderate pressures (up to 5-7 kb) and temperatures (400-600°C) typical of rock com plexes in the Khavyven Highland and on Karaginsky Island (55-50 Ma). According to the new U-Pb zircon isotope data, the most ancient protolith of metamorphic complexes in eastern Kamchatka is represented by the volcanosedimentary rocks of Karaginsky Island (181 ± 1.8 Ma). The age of the protolith of the Khavyven Highland is 100 ± 11 Ma. The age of the zircons from the garnet amphibolites of the Kamchatka Peninsula (77.6 ± 4.6 Ma) corresponds to the evolution period of the ophiolites of the gabbro-peridotite complex.The petrography and mineralogy of the metamor phic rocks. The main rock type of the Gnunvayam Group is represented by chlorite-epidote-amphib ole-plagioclase schists. The epidote-chlorite-pla gioclase-amphibole (± biotite) and epidote-amphib ole-chlorite-plagioclase schists are subordinate. The epidote and chlorite quartzites, as well as epidotebiotite-amphibole-plagioclase schists, are rare.

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Section: Methodsmentioning

confidence: 99%

U-Pb SHRIMP dating of zircons from metamorphic complexes in eastern Kamchatka

Tararin

Badredinov

Markovsky

et al. 2012

Russ. J. of Pac. Geol.

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“…The early tonalites representing the oldest rocks of the area with an age of 3141 ± 9.7 Ma could have been derived from metabasic rocks with an age similar to those of the ancient amphibolites of the Vodla River area [1]. The age of the gabbroamphibo lites of 3020 ± 21 Ma reflects the formation time of the Palaya Lamba greenstone belt, which implies a 120 Ma gap between the formation of the basement rocks and the greenstone belt.…”

Section: W W W H H H I I I T T T E E E S S S E E Ea a A Lake Lake Lakementioning

confidence: 98%

“…The analyzed zircons were taken from the rocks of the basement complex (tonalites, trondhjemites, micro cline granites) and the gabbroamphibolite and andes ite dikes cutting across them. The study was carried out at the Center of Isotopic Research of Karpinskii All Russia Research Institute of Geology by the U-Pb SIMS (SHRIMP II) method described in [1]. Below we report a short description of the studied rocks and zircon contained in them.…”

mentioning

confidence: 99%

“…A significant part of its area is occupied by rocks of the tonalite-trondhjemite-granodiorite (TTG) series. The available U-Pb zircon datings on some of these rocks are ~3.24 Ga [1][2][3], which makes it possible to consider the domain as the "ancient core" of the Bal tic shield [4,5]. The marginal parts of the domain are made up of greenstone belts consisting mainly of meta morphosed komatiite-basaltic volcanics.…”

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confidence: 99%

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New age data on the Archean rocks of the Vodlozero domain, Baltic shield, and their significance for geodynamic reconstructions

et al. 2012

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“…В пределах Балтийского щита породы с возрастами 3.2-3.6 млрд. лет выявле-ны в различных частях Карельской провинции [12,13,9,10], а также в северо-западной части Коль-ской провинции [8].…”

Section: геологический институт кнц ран апатиты; имгрэ москва Vetrunclassified

Изотопно – Геохимическая Систематика Неоархейских Субщелочных Пород Кейвской Структуры

Ветрин¹,

Ран²,

Имгрэ³

2018

Труды ФНС

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Age of the magmatic and metamorphic processes in the vodlozero complex, Baltic shield: An ion microprobe (SHRIMP II) U-Th-Pb isotopic study of zircons

Cited by 18 publications

References 3 publications

U-Pb SHRIMP dating of zircons from metamorphic complexes in eastern Kamchatka

U-Pb SHRIMP dating of zircons from metamorphic complexes in eastern Kamchatka

New age data on the Archean rocks of the Vodlozero domain, Baltic shield, and their significance for geodynamic reconstructions

Изотопно – Геохимическая Систематика Неоархейских Субщелочных Пород Кейвской Структуры

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