Devonian Island-Arc Magmatism of the Voikar Zone in the Polar Urals


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The studied deep-seated plutonic rocks of the Malyi Ural Paleozoic island arc include Sob’ gabbroid, diorite, and plagiogranitoid and Kongor gabbroid, diorite, and monzonitoid, which formed under similar P–T conditions. U–Pb LA-ICP-MS zircon dating established similar concordant age values: 406 ± 2 Ma for hornblende gabbrodiorite of the major intrusive phase in the Sob’ complex and 396 ± 1 and 393 ± 2 Ma for bipyroxene gabbrodiorite of the early and major phases in the Kongor complex. Our age data have made it possible to determine the formation time of the Kongor complex as Late Emsian–Early Eifelian (399–393 Ma). The largest volumes of island-arc igneous rocks belonging to the calc-alkali gabbro–diorite–tonalite–plagiogranite series formed in the Praghian–Early Eifelian (410–393 Ma). The Late Emsian–Early Eifelian (399–393 Ma) was characterized by the development of much smaller bodies consisting of Kongor rocks pertaining to the calc-alkali and high-K calk-alkali range, gradually transitioning into shoshonite–latite. High-K rocks formed upon completion of calc-alkali magmatism, likely due to the gradual decay of Devonian suprasubduction magmatism and partial melting in magma generation or due to the involvement of a second magma source.

作者简介

I. Sobolev

Institute of Geology, Russian Academy of Sciences; Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry, Russian Academy of Sciences

编辑信件的主要联系方式.
Email: sobolev_id@mail.ru
俄罗斯联邦, Moscow, 119017; Moscow, 119117

A. Soboleva

Komi Research Center, Ural Branch, Russian Academy of Sciences

Email: sobolev_id@mail.ru
俄罗斯联邦, Syktyvkar, 167982

O. Udoratina

Komi Research Center, Ural Branch, Russian Academy of Sciences

Email: sobolev_id@mail.ru
俄罗斯联邦, Syktyvkar, 167982

D. Varlamov

Institute of Experimental Mineralogy, Russian Academy of Sciences

Email: sobolev_id@mail.ru
俄罗斯联邦, Chernogolovka, Moscow oblast, 142432

J. Hourigan

University of California

Email: sobolev_id@mail.ru
美国, 1156 High Street, Santa Cruz, CA, 95064

V. Khubanov

Geological Institute, Siberian Branch, Russian Academy of Sciences

Email: sobolev_id@mail.ru
俄罗斯联邦, Ulan-Ude, 670047

M. Buyantuev

Geological Institute, Siberian Branch, Russian Academy of Sciences

Email: sobolev_id@mail.ru
俄罗斯联邦, Ulan-Ude, 670047

D. Soboleva

Schmidt Institute of Physics of the Earth, Russian Academy of Sciences

Email: sobolev_id@mail.ru
俄罗斯联邦, Moscow, 123995

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