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Early-middle Triassic basic magmatism and metamorphism of ultramafic-mafic complexes of the Ust’-Belaya terrane (central Chukotka, NE Russia) : 40Ar/39Ar ages, petrological and geochemical data, geodynamic interpretations. / Ledneva, Galina V.; Layer, Paul W.; Bazylev, Boris A. et al.

In: International Geology Review, Vol. 61, No. 9, 13.06.2019, p. 1052-1070.

Research output: Contribution to journal › Article › peer-review

Harvard

Ledneva, GV, Layer, PW, Bazylev, BA, Sokolov, SD, Kuzmin, D, Kononkova, NN & Ishiwatari, A 2019, 'Early-middle Triassic basic magmatism and metamorphism of ultramafic-mafic complexes of the Ust’-Belaya terrane (central Chukotka, NE Russia): 40Ar/39Ar ages, petrological and geochemical data, geodynamic interpretations', International Geology Review, vol. 61, no. 9, pp. 1052-1070. https://doi.org/10.1080/00206814.2018.1491013

APA

Ledneva, G. V., Layer, P. W., Bazylev, B. A., Sokolov, S. D., Kuzmin, D., Kononkova, N. N., & Ishiwatari, A. (2019). Early-middle Triassic basic magmatism and metamorphism of ultramafic-mafic complexes of the Ust’-Belaya terrane (central Chukotka, NE Russia): 40Ar/39Ar ages, petrological and geochemical data, geodynamic interpretations. International Geology Review, 61(9), 1052-1070. https://doi.org/10.1080/00206814.2018.1491013

Vancouver

Ledneva GV, Layer PW, Bazylev BA, Sokolov SD, Kuzmin D, Kononkova NN et al. Early-middle Triassic basic magmatism and metamorphism of ultramafic-mafic complexes of the Ust’-Belaya terrane (central Chukotka, NE Russia): 40Ar/39Ar ages, petrological and geochemical data, geodynamic interpretations. International Geology Review. 2019 Jun 13;61(9):1052-1070. doi: 10.1080/00206814.2018.1491013

Author

Ledneva, Galina V. ; Layer, Paul W. ; Bazylev, Boris A. et al. / Early-middle Triassic basic magmatism and metamorphism of ultramafic-mafic complexes of the Ust’-Belaya terrane (central Chukotka, NE Russia) : 40Ar/39Ar ages, petrological and geochemical data, geodynamic interpretations. In: International Geology Review. 2019 ; Vol. 61, No. 9. pp. 1052-1070.

BibTeX

@article{73f1d0f0b24645f69d4db931e3c53000,
title = "Early-middle Triassic basic magmatism and metamorphism of ultramafic-mafic complexes of the Ust{\textquoteright}-Belaya terrane (central Chukotka, NE Russia): 40Ar/39Ar ages, petrological and geochemical data, geodynamic interpretations",
abstract = "The Ust{\textquoteright}-Belaya terrane (Chukotka, NE Russia), belonging to the West Koryak fold belt, is made of mantle and crustal ultramafic-mafic complexes which originated during several discrete episodes of magmatic activity in the Neoproterozoic, the late Neoproterozoic-Cambrian and the early-middle Triassic and accreted to the Asian continental margin in the early Cretaceous. This paper focuses on the latest magmatic episode expressed in intrusion of microgabbro dikes and nearly coeval metamorphism superimposed on both ancient complexes and the dikes. We present original 40Ar/39Ar ages, mineral and bulk-rock chemistry of the microgabbro dikes, metamorphosed dike and vein cutting ultramafic-mafic complexes. Dike microgabbros resemble differentiated arc-tholeiitic magmas originated in a subduction setting. Differentiated magmas intruded into much older spinel peridotites and dunites located at mid-crustal levels. Intrusion and crystallization of these magmas was followed by down-going movement of spinel peridotites and rocks of the mantle-crust transition zone towards a mantle wedge where they were metamorphosed at high-P conditions. This metamorphism resulted in transformation of microgabbro to garnet amphibolite, diorite to albite-zoisite-paragonite-pargasite rock and spinel peridotites to metaperidotites. P-T parameters of this metamorphism reconstructed based on mineral assemblage of garnet amphibolite correspond to those of epidote amphibolite – amphibolite – amphibole eclogite facies transition. The peculiar zoisite (clinozoisite)-paragonite mineral assemblage typical of metamorphosed vein rock indicates high-P metamorphic conditions of epidote-amphibolite facies.",
keywords = "Ar/ Ar geochronology, arc tholeiite, Chukotka, early-middle Triassic, garnet amphibolite, high-P metamorphism, microgabbro, subduction, CALIBRATION, TECTONICS, MINERALS, BLUESCHISTS, GARNET, Ar-39 geochronology, HORNBLENDE, EASTERN KLAMATH MOUNTAINS, Ar-40, OPHIOLITE COMPLEX, TRINITY PERIDOTITE, AMPHIBOLITES",
author = "Ledneva, {Galina V.} and Layer, {Paul W.} and Bazylev, {Boris A.} and Sokolov, {Sergey D.} and Dmitry Kuzmin and Kononkova, {Natalia N.} and Akira Ishiwatari",
note = "Publisher Copyright: {\textcopyright} 2018, {\textcopyright} 2018 Informa UK Limited, trading as Taylor & Francis Group.",
year = "2019",
month = jun,
day = "13",
doi = "10.1080/00206814.2018.1491013",
language = "English",
volume = "61",
pages = "1052--1070",
journal = "International Geology Review",
issn = "0020-6814",
publisher = "Taylor and Francis Ltd.",
number = "9",

}

RIS

TY - JOUR

T1 - Early-middle Triassic basic magmatism and metamorphism of ultramafic-mafic complexes of the Ust’-Belaya terrane (central Chukotka, NE Russia)

T2 - 40Ar/39Ar ages, petrological and geochemical data, geodynamic interpretations

AU - Ledneva, Galina V.

AU - Layer, Paul W.

AU - Bazylev, Boris A.

AU - Sokolov, Sergey D.

AU - Kuzmin, Dmitry

AU - Kononkova, Natalia N.

AU - Ishiwatari, Akira

N1 - Publisher Copyright: © 2018, © 2018 Informa UK Limited, trading as Taylor & Francis Group.

PY - 2019/6/13

Y1 - 2019/6/13

N2 - The Ust’-Belaya terrane (Chukotka, NE Russia), belonging to the West Koryak fold belt, is made of mantle and crustal ultramafic-mafic complexes which originated during several discrete episodes of magmatic activity in the Neoproterozoic, the late Neoproterozoic-Cambrian and the early-middle Triassic and accreted to the Asian continental margin in the early Cretaceous. This paper focuses on the latest magmatic episode expressed in intrusion of microgabbro dikes and nearly coeval metamorphism superimposed on both ancient complexes and the dikes. We present original 40Ar/39Ar ages, mineral and bulk-rock chemistry of the microgabbro dikes, metamorphosed dike and vein cutting ultramafic-mafic complexes. Dike microgabbros resemble differentiated arc-tholeiitic magmas originated in a subduction setting. Differentiated magmas intruded into much older spinel peridotites and dunites located at mid-crustal levels. Intrusion and crystallization of these magmas was followed by down-going movement of spinel peridotites and rocks of the mantle-crust transition zone towards a mantle wedge where they were metamorphosed at high-P conditions. This metamorphism resulted in transformation of microgabbro to garnet amphibolite, diorite to albite-zoisite-paragonite-pargasite rock and spinel peridotites to metaperidotites. P-T parameters of this metamorphism reconstructed based on mineral assemblage of garnet amphibolite correspond to those of epidote amphibolite – amphibolite – amphibole eclogite facies transition. The peculiar zoisite (clinozoisite)-paragonite mineral assemblage typical of metamorphosed vein rock indicates high-P metamorphic conditions of epidote-amphibolite facies.

AB - The Ust’-Belaya terrane (Chukotka, NE Russia), belonging to the West Koryak fold belt, is made of mantle and crustal ultramafic-mafic complexes which originated during several discrete episodes of magmatic activity in the Neoproterozoic, the late Neoproterozoic-Cambrian and the early-middle Triassic and accreted to the Asian continental margin in the early Cretaceous. This paper focuses on the latest magmatic episode expressed in intrusion of microgabbro dikes and nearly coeval metamorphism superimposed on both ancient complexes and the dikes. We present original 40Ar/39Ar ages, mineral and bulk-rock chemistry of the microgabbro dikes, metamorphosed dike and vein cutting ultramafic-mafic complexes. Dike microgabbros resemble differentiated arc-tholeiitic magmas originated in a subduction setting. Differentiated magmas intruded into much older spinel peridotites and dunites located at mid-crustal levels. Intrusion and crystallization of these magmas was followed by down-going movement of spinel peridotites and rocks of the mantle-crust transition zone towards a mantle wedge where they were metamorphosed at high-P conditions. This metamorphism resulted in transformation of microgabbro to garnet amphibolite, diorite to albite-zoisite-paragonite-pargasite rock and spinel peridotites to metaperidotites. P-T parameters of this metamorphism reconstructed based on mineral assemblage of garnet amphibolite correspond to those of epidote amphibolite – amphibolite – amphibole eclogite facies transition. The peculiar zoisite (clinozoisite)-paragonite mineral assemblage typical of metamorphosed vein rock indicates high-P metamorphic conditions of epidote-amphibolite facies.

KW - Ar/ Ar geochronology

KW - arc tholeiite

KW - Chukotka

KW - early-middle Triassic

KW - garnet amphibolite

KW - high-P metamorphism

KW - microgabbro

KW - subduction

KW - CALIBRATION

KW - TECTONICS

KW - MINERALS

KW - BLUESCHISTS

KW - GARNET

KW - Ar-39 geochronology

KW - HORNBLENDE

KW - EASTERN KLAMATH MOUNTAINS

KW - Ar-40

KW - OPHIOLITE COMPLEX

KW - TRINITY PERIDOTITE

KW - AMPHIBOLITES

UR - http://www.scopus.com/inward/record.url?scp=85049565644&partnerID=8YFLogxK

U2 - 10.1080/00206814.2018.1491013

DO - 10.1080/00206814.2018.1491013

M3 - Article

AN - SCOPUS:85049565644

VL - 61

SP - 1052

EP - 1070

JO - International Geology Review

JF - International Geology Review

SN - 0020-6814

IS - 9

ER -

ID: 14405825