U–Pb age and Sr–Nd isotopic characteristics of the Dzhida Island-arc system felsic volcanites (Southwestern Transbaikalia): transition to the mature arc stage

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The study of felsic and intermediate volcanites of the Dzhida island-arc system (Southwestern Transbaikalia) has been carried out. The volcanites correspond to low-potassium andesites, dacites, and rhyodacites of the tholeiitic petrochemical series and are comparable to volcanogenic formations predominate within the volcanic fronts of mature island arcs. U–Th–Pb (SIMS) age estimate (527±13 Ma) of crystallization was obtained for dacites for the first time, indicating their formation in the Early Cambrian and, accordingly, the period of transition from the nascent (primitive) arc stage to the mature arc stage. Relatively low isotopic 87Sr/86Sr (0.7036–0.7038) ratios and positive ɛNd(T) values (4.2 to 6.4) in the intermediate and felsic volcanites are most likely inherited from the juvenile crust, which rocks could have been formed as a result of mantle melt differentiation, i.e. as the island-arc system evolved, additional sources were involved in the magma generation process.

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作者简介

A. Elbaev

N.L. Dobretsov Geological Institute, Siberian Branch of the Russian Academy of Sciences

编辑信件的主要联系方式.
Email: elbaev@ginst.ru
俄罗斯联邦, Ulan-Ude

I. Gordienko

N.L. Dobretsov Geological Institute, Siberian Branch of the Russian Academy of Sciences

Email: elbaev@ginst.ru

Correspondent Member of the RAS

俄罗斯联邦, Ulan-Ude

V. Savatenkov

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

Email: elbaev@ginst.ru
俄罗斯联邦, Sankt-Petersburg

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2. Fig. 1. a – The layout of volcanogenic and intrusive formations of the Russian part of the Dzhida island arc system [1]; b – a fragment of the geological map of the interfluve Dzhida-Tsakirka according to V.D. Bayanov et al., with changes: 1 – basalt strata (V1); 2 - rhyolite–andesite strata (V2); 3 – tuff stratum (E2-3); 4 – basite-hyperbasites (R3-V); 5 – Dzhida intrusive complex (V-E1); 6 – discontinuous faults; c – section along the A–B line: 1 – volcanites of medium composition; 2 – volcanites of acid composition; 3 – tuffs; 4 – Djida intrusive complex (V-E1)

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3. Fig. 2. Diagram of SiO2–Zr/TiO2 (a) according to [11], K2O–SiO2 (b) according to [12]: 1 – andesites, 2 – dacites of the right bank of the Tsakirka River, 3 – andesites, 4 – dacites of the right bank of the Tsakirka River. Jida

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4. 3. Distribution spectra of rare earth and rare element contents in rocks of the rhyolite-andesite stratum: 1 – andesites, 2 – dacites of the right bank of the Tsakirka River, 3 – andesites, 4 – dacites of the right bank of the river. Jida. Normalization of chondrite according to [14] and primitive mantle according to [15]

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5. Fig. 4. a – Cathodoluminescent images of zircons with points for determining the age of their crystallization (model CC20-15); b – diagram with concordia for zircons from the dacite rhyolite-andesite strata of the Djida Caledonian zone

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6. 5. Isotopic compositions of Ediacaran-Early Cambrian medium-acid island-arc volcanics of the central segment of the Central Asian folded belt in diagram ɛND(T) – age: 1 – volcanites of the Dzhida zone (RA15-11–andesite, RA15-10 – rhyodacite, CC20-15 – dacite); 2 – plagioriolite, Western Sayan; 3 – dacite, Mountain Shoria; 4 – plagioriodacite, Salair ridge

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