Sm-Nd Age of the Sviatonossites of the Sviatoi Nose Peninsula (Eastern Baikal Region)

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Abstract

Sviatonossites are syenites with andradite garnet, a rare type of igneous rocks described by P. Eskol in 1913 on the Sviatoy Nose peninsula (Lake Baikal). Due to the absence of zircon in the rocks, which makes it possible to date the age of rocks using a reliable U-Pb method, geochronological studies of Sm and Nd by the gross composition and minerals were carried out. As a result, 2 estimated periods of the formation of the Saints were obtained. According to the gross composition and four minerals (garnet, pyroxene, potassium feldspar, apatite), the age was 262 ± 21 million years (SQUAW = 1.6), and according to the gross composition and garnet — 274 ± 25 million years (SQUAW = 0.0). The results obtained coincide with the boundaries of the manifestation of tectonic-metamorphic and magmatic processes associated with the formation of the East Trans-Baikal segment of the Central Asian (Mongol-Okhotsk) folded belt. Sviatonossites in complexes of mobile (folded) belts framed by the Siberian craton are indicator rocks reflecting the manifestation of mantle-crustal interaction.

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About the authors

V. I. Levitsky

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

Author for correspondence.
Email: vlevit@igc.irk.ru
Russian Federation, Irkutsk

V. P. Kovach

Institute of Geology and Geochronology of the Precambrian of the Russian Academy of Sciences

Email: vlevit@igc.irk.ru
Russian Federation, Saint Petersburg

A. B. Kotov

Institute of Geology and Geochronology of the Precambrian of the Russian Academy of Sciences

Email: vlevit@igc.irk.ru

Corresponding Member of the RAS

Russian Federation, Saint Petersburg

L. Z. Reznitsky

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

Email: vlevit@igc.irk.ru
Russian Federation, Irkutsk

I. V. Levitsky

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

Email: vlevit@igc.irk.ru
Russian Federation, Irkutsk

N. Yu. Zagornaya

Institute of Geology and Geochronology of the Precambrian of the Russian Academy of Sciences

Email: vlevit@igc.irk.ru
Russian Federation, Saint Petersburg

References

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2. Fig. 1. Schematised geological map of the Svyatoy Nos Peninsula (shown with an arrow on the inset), by [3]. 1 - Quaternary sediments; 2 - metamorphic rocks of the Svyatoy Nos series; 3 - granitoids, undivided by composition and age; 4 - manifestations of svyatonosites (1 - Eskolsky massif, 2 - Markovsky massif). The asterisk shows the place of sample CH-57 selection

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3. Fig. 2. Sm-Nd-isochrones for sanctonosotite СН-57. (a) for four minerals and the rock as a whole; (b) for garnet and the rock as a whole. Symbols in Table 2

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