Jurassic-cretaseous high-potassic volcanism of tne Nerchinsk depression in Eastern Transbaikalia and its geodynamic nature

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Abstract

The geochronological, geochemical and Sr-Nd isotopic features of Late Mesozoic volcanic rocks associated with the development of the Nerchinsk depression in Eastern Transbaikalia are presented. Its structure involves the sequences of high-potassium subalkaline volcanic rocks containing of 55 to 73 wt.% SiO2.40Ar/39Ar isotope dating of bulk rock samples was performed. 40Ar/39Ar dating results from high-K basaltic andesite gives value of 150.8±1.8 Ma and from latite is 131.0±1.6 Ma. Volcanic rocks are characterized by depletion of hydrophobic Ti, Nb and Ta, slightly negative εNd(T) values, but increased in εSr(T), that probably indicates contamination processes of primary melts by crust component. In terms of their geological and geochemical characteristics, the volcanic rocks of the Nerchinsk depression belong to the shoshonite-latite series of the rear part of the Greater Khingan volcanic region, which formed in the subduction setting of a continental active margin.

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About the authors

A. A. Vorontsov

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

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

E. N. Federyagina

Irkutsk State University

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

S. I. Dril

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

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

S. A. Sasim

Irkutsk State University

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

A. V. Travin

V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of Russian Academy of Sciences

Email: voront@igc.irk.ru
Russian Federation, Novosibirsk

A. E. Budyak

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

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

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2. Fig. 1. Scheme of the geological structure of the Nerchinsk Depression. Materials from [1] were used in the preparation. The inset shows a scheme of the location of the late Mesozoic igneous regions within Central Asia. Materials from [11] were used in the preparation. Legend for the scheme of the geological structure: 1–3 — loose sediments: 1 — QII-IV, 2 — N2-Q1, 3 — K1; 4 — late Mesozoic volcanics of the Shadoron and Undinodainsky series without division; 5 — late Jurassic granites; 6 — Carboniferous granites and granodiorites; 7 — Palesoic mafic rocks; 8 — Paleozoic sialic rocks without division by age; 9 — Proterozoic geological complexes; 10 — faults; 11 — sampling points. Legend for the inset: 12 – regions within the late Mesozoic igneous province of East Asia (WZ – West Transbaikal, VM – East Mongolian, BH – Greater Khingan, YH – South Khangai); 13 – structures of the Mongol-Okhotsk belt; 14 – platforms (S – Siberian, NK – North Chinese); 15 – overlap zone of the East Mongolian and Greater Khingan regions; 16 – Central Asian folded belt. Asterisks (out of scale) indicate depressions and associated volcanic associations: N – Nerchinsk, A-Z – Aleksandrovo-Zavodskaya, Sh – Shadoronskaya, UK – Ust-Kara.

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3. Fig. 2. Results of 40Ar/39Ar dating of volcanics of the Nerchinsk Depression: age, Ca/K spectra and inverse isochron diagrams.

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4. Fig. 3. Classification diagrams and normalized distributions of rare elements according to [17] for volcanics of the Nerchinsk Depression: a) (Na2O+K2O) – SiO2, the dotted line (Irvine-Baragar line) separates the composition fields of alkaline and moderately alkaline rocks according to [14]; b) K2O – SiO2 according to [16] with additions according to [4]; c, d) spider diagrams for the most basic volcanics, d, e) spider diagrams for sialic rocks. 1–2 – volcanics of the Shadoron series (≈151 Ma): 1 – SiO2 55–57 wt.%, 2 – SiO2 57–73 wt.%; 3–4 – volcanics of the Undinodain series (≈131 million years): 3 – SiO2 55–57 wt.%, 4 – SiO2 61–62 wt.%.

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5. Fig. 4. Sr and Nd isotopic composition in the rocks of the Nerchinsk Depression. 1–2 – volcanics of the Shadoron series (≈151 Ma): 1 – SiO2 55–57 wt. %, 2 – SiO2 57–73 wt. %; 3–4 – volcanics of the Undinodain series (≈131 Ma): 3 – SiO2 55–57 wt. %, 4 – SiO2 61–62 wt. %.

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