Age of Alkaline Ultramafic Explosion Pipes of the Chapinsky Complex (Yenisei Ridge)

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Resumo

The age of formation of explosion pipes of the Chapinsky complex in the Chingasan magmatic belt in the north of the Yenisei Ridge was determined. U-Pb dating of zircon megacrysts from alkaline-ultramafic rocks established values of 657.7 ± 13.4 and 647.6 ± 9.7 Ma for the Natalyinskaya and № 3 pipes, respectively. The intrusion of alkaline-ultramafic explosion pipes of the Chapinsky complex corresponds to the time of manifestation of ultramafic alkaline magmatism along the southern and southwestern margin of the Siberian craton.

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Sobre autores

Yu. Danilova

Institute of the Earth’s Crust of the Siberian Branch of the Russian Academy of Sciences

Autor responsável pela correspondência
Email: jdan@crust.irk.ru
Rússia, Irkutsk

I. Sharygin

Institute of the Earth’s Crust of the Siberian Branch of the Russian Academy of Sciences

Email: jdan@crust.irk.ru
Rússia, Irkutsk

E. Gladkochub

Institute of the Earth’s Crust of the Siberian Branch of the Russian Academy of Sciences

Email: jdan@crust.irk.ru
Rússia, Irkutsk

E. Nikolenko

ALROSA (ZIMBABWE)(PRIVATE) LIMITED

Email: jdan@crust.irk.ru
Zimbabwe, Harare

N. Bryansky

Institute of the Earth’s Crust of the Siberian Branch of the Russian Academy of Sciences; Irkutsk State University

Email: jdan@crust.irk.ru
Rússia, Irkutsk; Irkutsk

S. Skuzovatov

Vinogradov Institute of Geochemistry Siberian Branch of the Russian Academy of Sciences

Email: jdan@crust.irk.ru
Rússia, Irkutsk

A. Gladkov

Institute of the Earth’s Crust of the Siberian Branch of the Russian Academy of Sciences

Email: jdan@crust.irk.ru
Rússia, Irkutsk

A. Ivanov

Institute of the Earth’s Crust of the Siberian Branch of the Russian Academy of Sciences

Email: jdan@crust.irk.ru
Rússia, Irkutsk

D. Koshkarev

ALROSA

Email: jdan@crust.irk.ru
Rússia, Mirny

F. Letnikov

Institute of the Earth’s Crust of the Siberian Branch of the Russian Academy of Sciences

Email: jdan@crust.irk.ru

Academician of the RAS

Rússia, Irkutsk

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2. Fig. 1. Scheme of the geological structure of the Chapinsky ultrabasic alkaline complex in the structure of the Yenisei Ridge (a): 1 - alluvial deposits; 2 - Early Paleozoic sedimentary deposits; 3 - volcanogenic-sedimentary deposits of the Chapa series; 4 - Neoproterozoic terrigenous and volcanogenic-terrigenous complexes; 5 - Early Proterozoic metamorphosed carbonate-terrigenous deposits; 6 - Archean undissected metamorphic complexes. 7-10 magmatic formations: 7 - Chapinsky CSM: explosion pipes (a), stokes (b), sills (c), dikes (d) (out of scale); 8 - Orlovsky subvolcanic complex of basalt-andesite-rhyolite composition; 9 - Garevsky ultrametamorphic complex of granite-granite-gneisses; 10 - Shumikhinsky metapicritic-basalt subvolcanic complex. 11 - faults: Ishimbinsky deep fault (a), minor faults (b), tectonic disturbances (c). The inset (b) shows the marginal structures of the southern and southwestern margins of the Siberian Craton: I - Prisayan basement ledge; II - Uriksko-Iisky graben, including the Ziminsky SCR (H); III - Yenisei ridge, including the Chapin SCR (C)

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3. Fig. 2. Mineral relationships in the rocks of the Nataliinskaya, No. 3, and Glubokaya pipes. Photographs of slits (a-d), images in backscattered electrons (e-h). Mineral symbols: Ap - apatite, Bdy - baddeleyite, Cal - calcite, Chl - chlorite, Dol - dolomite, Mag - magnetite, Ol - olivine, Phl - phlogopite, Py - pyrite, Qz - quartz, Spl - spinel, Srp - serpentine, Zrn - zircon

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4. Fig. 3. U-Pb-age of zircon megacrysts from explosion tubes of the Chapinsky CSF field. Cathodoluminescence images: a - Natalinskaya pipe; b - pipe No. 3; c - kimberlite [13], d and e - concordia diagrams for zircon megacrysts

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