TY - JOUR

T1 - Geochronology of the metamorphic rocks in the Kurai accretionary prism (south-eastern Gorny Altai)

AU - Kulikova, A. V.

AU - Buslov, M. M.

AU - Travin, A. V.

PY - 2017/1/1

Y1 - 2017/1/1

N2 - The paper provides a review of the published and new geological and geochronological data on the metamorphic rocks in the Kurai accretionary prism, considering the evolution of the Kuznetsk-Altai island-arc paleosubduction channel of the Siberian continent. The following two stages are distinguished by 40Ar/39Ar and U/Pb dating: (1) 636-619 Ma and earlier: sinking of ophiolites into the subduction zone; (2) 604-585 Ma: sinking of the large bodies of oceanic uplifts into the subduction zone. These processes led to the exhumation of the high-pressure rocks and the hot Chagan-Uzun peridotites. The dynamo-thermal effect of the latter on the basalts is reflected in the inverted metamorphic zoning and the occurrence of garnet amphibolites and plagiogranite migmatites. It is probable that the paleo-seamounts collided with the island arc during the Vendian-Early Cambrian. The data reviewed in this paper give evidence of an active margin of the West Pacific type in the western Altai-Sayan folded region in the Vendian-Cambrian.

AB - The paper provides a review of the published and new geological and geochronological data on the metamorphic rocks in the Kurai accretionary prism, considering the evolution of the Kuznetsk-Altai island-arc paleosubduction channel of the Siberian continent. The following two stages are distinguished by 40Ar/39Ar and U/Pb dating: (1) 636-619 Ma and earlier: sinking of ophiolites into the subduction zone; (2) 604-585 Ma: sinking of the large bodies of oceanic uplifts into the subduction zone. These processes led to the exhumation of the high-pressure rocks and the hot Chagan-Uzun peridotites. The dynamo-thermal effect of the latter on the basalts is reflected in the inverted metamorphic zoning and the occurrence of garnet amphibolites and plagiogranite migmatites. It is probable that the paleo-seamounts collided with the island arc during the Vendian-Early Cambrian. The data reviewed in this paper give evidence of an active margin of the West Pacific type in the western Altai-Sayan folded region in the Vendian-Cambrian.

KW - Ar/Ar dating

KW - Accretionary prism

KW - Geochronology

KW - Metamorphic rocks

KW - geochronology

KW - Ar-40/Ar-39 dating

KW - COMPLEX

KW - TECTONICS

KW - CRUSTAL GROWTH

KW - GEODYNAMICS

KW - accretionary prism

KW - metamorphic rocks

KW - OPHIOLITE

KW - EVOLUTION

KW - CENTRAL-ASIA

KW - BELT

KW - SIBERIAN CONTINENT

KW - RUSSIA

UR - http://www.scopus.com/inward/record.url?scp=85042386379&partnerID=8YFLogxK

U2 - 10.5800/GT-2017-8-4-0332

DO - 10.5800/GT-2017-8-4-0332

M3 - Article

AN - SCOPUS:85042386379

VL - 8

SP - 1049

EP - 1063

JO - Geodynamics and Tectonophysics

JF - Geodynamics and Tectonophysics

SN - 2078-502X

IS - 4

ER -