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The Early Paleozoic Active Margin of the Khangai Segment of the Mongol–Okhotsk Ocean

Authors
  • Yarmolyuk, V. V.1
  • Kozakov, I. K.2
  • Kozlovsky, A. M.1
  • Kudryashova, E. A.1
  • Travin, A. V.3, 4, 5
  • Kirnozova, T. I.6
  • Fugzan, M. M.6
  • Plotkina, Yu. V.2
  • 1 Russian Academy of Sciences, Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry, Moscow, 119017, Russia , Moscow (Russia)
  • 2 Russian Academy of Sciences, Institute of Precambrian Geology and Geochronology, St. Petersburg, 199034, Russia , St. Petersburg (Russia)
  • 3 Russian Academy of Sciences, Sobolev Institute of Geology and Mineralogy, Siberian Branch, Novosibirsk, 630090, Russia , Novosibirsk (Russia)
  • 4 Novosibirsk State University, Novosibirsk, 630090, Russia , Novosibirsk (Russia)
  • 5 Tomsk State University, Tomsk, 634050, Russia , Tomsk (Russia)
  • 6 Russian Academy of Sciences, Vernadsky Institute of Geochemistry and Analytical Chemistry, Moscow, 119991, Russia , Moscow (Russia)
Type
Published Article
Journal
Doklady Earth Sciences
Publisher
Pleiades Publishing
Publication Date
May 01, 2018
Volume
480
Issue
1
Pages
559–563
Identifiers
DOI: 10.1134/S1028334X18050094
Source
Springer Nature
License
Yellow

Abstract

Within the northern fringe of the western (Khangai) flank of the Mongol–Okhotsk fold belt, magmatic complexes of intermediate to moderately acidic rocks occur. They comprise widely distributed gabbro–diorites, diorites, tonalites, and granodiorites. Geochronological studies have demonstrated that these rocks were formed in the time span of 437 to 375 Ma. The geochemical affinities of the rocks suggest their formation in subduction tectonic settings; hence, their paleotectonic position corresponds to the continental margin of the Mongol–Okhotsk paleoocean. It has been concluded that this Middle Paleozoic igneous activity occurred in the active continental margin settings, formed by subduction of the paleooceanic plate under the Siberian continent.

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