Rapakivi granites and associating magmatism during the Aptian development stage of the Siberian craton active continental margin (northeast Asia)

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Abstract

We present new data on the U–Th–Pb geochronology, mineralogy, geochemistry, and Sm-Nd and Rb-Sr isotopes for granitoids and associating subalkaline rocks of the Tarbagannakh pluton of the Allakh-Yun tectonic zone in the Verkhoyan fold-thrust belt. These rocks, including trachyandesibasalt dikes, combined into the Uemlyakh complex, were formed ca. 120 Ma from a continental crust source probably with input from and enriched mantle component. Rapakivi granites are reported for the first time in these intrusions – their origin is an important reference for understanding the geodynamic formation setting for this complex. We propose a tectonic model for the formation of these rocks due to slab break-off during the development of the active continental margin in the Aptian age. We discuss that this magmatism was conducive for the widespread development of metasomatic processes until the end of the Aptian age and was at the same time a source of gold mineralization of the overlapping Okhotsk-Koryak metallogenic belt.

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About the authors

A. E. Vernikovskaya

Diamond and Precious Metal Geology Institute, Siberian Branch of the Russian Academy of Sciences; Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of the Russian Academy of Sciences; Novosibirsk State University

Email: matushkinny@ipgg.sbras.ru
Russian Federation, Yakutsk; Novosibirsk; Novosibirsk

V. Yu. Fridovsky

Diamond and Precious Metal Geology Institute, Siberian Branch of the Russian Academy of Sciences

Email: matushkinny@ipgg.sbras.ru

Corresponding Member of the RAS

Russian Federation, Yakutsk

N. V. Rodionov

A.P. Karpinsky Russian Geological Research Institute

Email: matushkinny@ipgg.sbras.ru
Russian Federation, St. Petersburg

N. Yu. Matushkin

Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of the Russian Academy of Sciences; Novosibirsk State University

Author for correspondence.
Email: matushkinny@ipgg.sbras.ru
Russian Federation, Novosibirsk; Novosibirsk

P. I. Kadilnikov

Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of the Russian Academy of Sciences; Novosibirsk State University

Email: matushkinny@ipgg.sbras.ru
Russian Federation, Novosibirsk; Novosibirsk

M. V. Kudrin

Diamond and Precious Metal Geology Institute, Siberian Branch of the Russian Academy of Sciences

Email: matushkinny@ipgg.sbras.ru
Russian Federation, Yakutsk

Ya. A. Tarasov

Diamond and Precious Metal Geology Institute, Siberian Branch of the Russian Academy of Sciences

Email: matushkinny@ipgg.sbras.ru
Russian Federation, Yakutsk

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2. Fig. 1. Regional position of the Tarbagannakh massif in the structure of the Verkhoyansk-Chukotka folded region and the South Verkhoyansk sector of the VSNBP, compiled using [1, 4]. Letter abbreviations – tectonic sutures: P – Polousno-Kolyma, Yu – South-Anyui, M – Koni-Murgal, N – Novosibirsk-Kolyma, B – Bilyakchan; faults: T – Adycha-Taryn; tectonic zones of the South Verkhoyansk segment: K – Kyllakh, S – Sette-Daban, A – Allah-Yun.

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3. Fig. 2. Scheme of the geological structure of the Tarbagannakh massif, compiled using [8, 11].

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4. Fig. 3. Rare earth element distribution spectra (a) and spider diagrams (b) for the rocks of the Tarbagannakh massif. 1 – monzodiorites and transitional varieties from monzonite to quartz monzodiorites sometimes with rapakivi structure, 2 – granodiorites with rapakivi structure, 3 – granite with rapakivi structure, 4 – basaltic trachyandesites, 5 – subalkaline leucocratic granite. Element contents are normalized to chondrite according to [16] and to the primitive mantle according to [17]. The content lines of the upper (UCC) and lower (LCC) continental crust are given according to [18]. The content line of ocean island basalts (OIB) is given according to [19].

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5. Fig. 4. Concordia diagrams and cathodoluminescence (CL) images of zircons from intrusive rocks of the Tarbagannakh massif (a) sample TBG-8–21 of quartz monzonite and (b) sample TBG-2–21 of granodiorite. Circles with numbers are analytical points. Numbers are age (million years).

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6. Fig. 5. Isotope correlation diagram εNd(T)—(87Sr/86Sr)0 according to [20] for igneous rocks of the Uemlyakh complex of the Allah-Yun tectonic zone using the data from Table 2. Mantle sources by isotope characteristics: DM – depleted mantle, EM I and EM II – enriched mantle, HIMU – mantle with a high U/Pb ratio, PREMA – prevailing or weakly depleted mantle and BSE – bulk silicate Earth. Colored symbols – sample numbers (note to Table 2).

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