The oldest island-arc granitoids of Chingiz-Tarbagatay region (Eastern Kazakhstan): age substantiation and сomposition affinities

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Resumo

The oldest granitoids of Kan-Сhingiz complex in Chingiz-Tarbagatay region of Eastern Kazakhstan, composed of quartz diorites, granodiorites, plagiogranites and granites, are first dated. U-Pb (ID-TIMS and SIMS) geochronological study of granites and plagiogranites is carried out and age estimates 509±2 and 512±3 Ma, approximately corresponding to the boundary of Early and Middle Cambrian, are obtained. These data allow to consider the age of volcanic-sedimentary sequences, host for granitoids, as Early Cambrian. Composition affinities of granitoids of Kan-chingiz complex indicate their formation within ensimatic island arc.

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Sobre autores

К. Degtyarev

Geological Institute of the Russian Academy of Sciences

Autor responsável pela correspondência
Email: degtkir@mail.ru

Academician of the RAS

Rússia, Moscow

М. Luchitskaya

Geological Institute of the Russian Academy of Sciences

Email: degtkir@mail.ru
Rússia, Moscow

А. Тret’yakov

Geological Institute of the Russian Academy of Sciences

Email: degtkir@mail.ru
Rússia, Moscow

Е. Sal’nikova

Institute of Precambrian Geology and of the Russian Academy of Sciences

Email: degtkir@mail.ru
Rússia, St.-Petersburg

Y. Plotkina

Institute of Precambrian Geology and of the Russian Academy of Sciences

Email: degtkir@mail.ru
Rússia, St.-Petersburg

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2. Fig. 1. Scheme of tectonic zoning of the Paleozoides of Kazakhstan and Northern Tien Shan. 1–5 – folded regions: 1 – Boshchekul-Chingiz, 2 – Kokchetav-Northern Tien Shan; 3, 4 – Ishim-Middle Tien Shan: 3 – Precambrian metamorphic complexes, 4 – Ediacaran-Lower Paleozoic terrigenous and siliceous-terrigenous strata, 5 – Dzungar-Balkhash (D-B) and Irtysh-Zaisan (I-Z); 6 – Upper Devonian-Permian superimposed basins; 7, 8 – volcano-plutonic belts: 7 – Late Paleozoic Balkhash-Ili, 8 – Devonian Kazakhstan; 9 – boundaries of folded regions, 10 – the largest late Paleozoic-early Mesozoic shifts. Regions of the Boshchekul-Chingiz folded region: S – Seletinsky, B – Boshchekulsky, Ch-T – Chingiz-Tarbagataisky.

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3. Fig. 2. (a) Scheme of the geological structure of the central part of the Chingiz-Tarbagatai region (Eastern Kazakhstan). 1 - Cenozoic deposits; 2 - Upper Devonian and Lower Carboniferous terrigenous-carbonate strata; 3 - Middle-Upper Ordovician terrigenous and volcanic strata; 4 - Upper Cambrian and Lower-Middle Ordovician volcanic and siliceous-terrigenous strata; 5 - Middle Cambrian-Middle Ordovician terrigenous-carbonate-siliceous strata; 6 - Lower-Middle Cambrian effusive rocks and tuffs of basic, intermediate and acidic composition; 7–10 – granitoid complexes: 7 – Saryshokinsky Early Permian, 8 – Chetsky Late Silurian, 9 – Chagansky Early–Middle Ordovician, 10 – Kan-Chingizsky Early–Middle Cambrian; 11 – faults: a – tectonic covers, b – others. (b) Scheme of the geological structure of the Koldenensky massif and its framework. Compiled using materials by M.A. Orenburgsky. 1–3 – Middle Cambrian – Middle Ordovician. Koldenensky sequence: 1 – sandy-siltstone member, 2 – siliceous member, 3 – terrigenous-carbonate member; 4 – Middle Cambrian, Amginsky stage; tuffs and lavas of intermediate and basic composition with limestone lenses; 5 – Lower Cambrian; effusive rocks and tuffs of basic, intermediate and acidic composition; 6, 7 – early–middle Cambrian. Kan-Chingiz complex: 6 – plagiogranites and granites, 7 – granodiorites; 8 – faults; 9 – locations of remains: a – trilobites, b – conodonts, c – inarticulate brachiopods, d – graptolites; 10 – location of sample collection for geochronological studies and its number.

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4. Fig. 3. Scheme of the geological structure of the Ust-Karasuysky massif and its framework. Compiled using materials by N.A. Klepikov. 1 - Cenozoic deposits; 2 - Upper Devonian and Lower Carboniferous limestones; 3 - Lower Silurian. Donenzhalskaya suite: sandstones, siltstones, limestones, effusive rocks of basic and acid composition; 4-6 - Lower Cambrian. Ayaguz series: 4 - rhyolites, rhyodacites, dacites, their tuffs and tuff-pechanics, 5 - gray cherts, 6 - basalts and trachybasalts; 7, 8 - Early-Middle Cambrian; Kan-Chingiz complex: 7 - plagiogranites, 8 - granodiorites, diorites and gabbro-diorites; 9 – location of sample collection for geochronological studies and its number. UK – Ust-Karasuysky massif.

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5. Fig. 4. Micrographs of zircon crystals taken with a TESCAN VEGA3 scanning electron microscope in secondary electron (I–IV) and cathodoluminescence (V–VIII) modes (a) and a concordia diagram (b) for granites of the Koldenensky massif (sample TS-10132). The point numbers on the diagram correspond to the serial numbers in Table 1

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6. Fig. 5. Micrographs of zircon crystals taken on a Camscan MX 2500S scanning electron microscope in cathodoluminescence mode (circles indicate dating areas) (a) and a concordia diagram (b) for plagiogranites of the Ust-Karasuysky massif (sample CHN-1740). The point numbers correspond to the serial numbers in Table 2.

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7. Fig. 6. Diagrams Ab–An–Or (a), Al2O3–SiO2 (b), TiO2–SiO2 (c) [17] for quartz diorites, granodiorites, plagiogranites and granites of the Koldenensky, Kan-Chingiz and Ust-Karasuysky massifs. 1–3 – quartz diorites, granodiorites, plagiogranites and granites of the massifs: 1 – Koldenensky, 2 – Kan-Chingiz; 3 – Ust-Karasuysky.

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8. Fig. 7. Chondrite-normalized REE distributions (a–c) and spidergrams of rare elements normalized to the composition of the primitive mantle (d–e) for quartz diorites, granodiorites, plagiogranites, and granites of the Koldenensky, Ust-Karasuysky, and Koldenensky massifs. For legend, see Fig. 6.

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9. Fig. 8. Rb–Y+Nb diagrams [18, 20] 1 – granitoids of ensimatic arcs; 2 – granitoids of continental arcs and arc–continent collision zones [19]. For other designations, see Fig. 6. Fields on the diagrams, granites: VAG – volcanic arcs, ORG – oceanic ridges, WPG – within-plate, syn-COLG – syn-collisional, post-COLG – post-collisional, arc – island-arc, slab failure – the emplacement of which is associated with the stage of separation of a part of the oceanic plate during accretion (collision) of island-arc structures to the continental margin and its thickening, A-type – A-type.

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