Polychronity and polygeneity of pegmamtites of gneissic-amphibolitic complexes as a result of continuous-discontinuous development of suture zones: Example of the Ufalei metamorphic block in the Middle Urals

Koroteev, V. A.; Ogorodnikov, V. N.; Ronkin, Yu. L.; Sazonov, V. N.; Polenov, Yu. A.

doi:10.1134/s1028334x09090074

Dokl. Earth Sc.

2009

DOI: 10.1134/s1028334x09090074

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Polychronity and polygeneity of pegmamtites of gneissic-amphibolitic complexes as a result of continuous-discontinuous development of suture zones: Example of the Ufalei metamorphic block in the Middle Urals

V. A. Koroteev

V. N. Ogorodnikov

Yu. L. Ronkin

et al.

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“…Intrafault pegmatites and metaso matic rocks not related genetically to intrusions are of special interest, because their formation reflects to the maximum extent the action of the endogenetic fluid systems on the destructured substratum [1,2]. Isoto pic dating of such rocks makes it possible to outline the boundaries of tectonic activation and related fault zone fluidization.…”

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Principle stages of granite and pegmatite formation in the southeastern part of the Main Sayan Fault

et al. 2012

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We performed U-Pb dating by the SHRIMP II method of zircon from granites and pegmatites in the southeastern part of the Main Sayan Fault (northern part of Khamar-Daban and southeastern part of the Belya-Kitoi Terrains in the Central Asian fold belt). According to the results obtained, along with the Late Ordovician granitoid magmatism, the Khamar-Daban and Belya-Kitoi Terrains were characterized by a less massive Carboniferous period at their boundary with the Siberian Craton accompanied by granite and peg matite formation and reflecting tectonomagmatic activation of the Main Sayan Fault. Three stages of mag matic activation were noted. The earliest stage (about 350 million years ago) implies the formation of pegma toid quartz-albite-microcline (amazonite) granite veins with Nb-Y mineralization in the fault zone. Oligo clase-microcline pegmatite veins with graphite were crystallized in the fault zone at the second stage (about 330 million years ago). The final stage of endogenetic activity (about 310 million years ago) was characterized by migmatization of the Khangarul Group of the Khamar-Daban Terrain and formation of potassium gran ites (Fig. 3; Table 1).

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Principle stages of granite and pegmatite formation in the southeastern part of the Main Sayan Fault

et al. 2012

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New data on the trace element composition and Lu-Hf isotopic system of zircons from the Early Cambrian granites of the Ufaley block (Middle Urals): a step to the correction of geodynamic concepts

Shardakova

2022

Lithosphere

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Research subject. Composition and isotopic parameters of zircons and their host granites of the Bitim complex, localised in the eastern part of the Ufaley block (Middle Urals).Materials and methods. The determination of trace element composition and Lu-Hf isotope system in zircons was carried out by LA-ICP-MS (the “Geoanalitik” shared research facilities of the IGG UB RAS, Ekaterinburg).Results and conclusions. The images and geochemical features of the main zircon population from granites confirm their magmatic genesis and minimal alteration, which proves previously defined Vendian- Cambrian (520 ± 9 Ma) age for the granites. Younger zircons (401–459 Ma) differing in composition from the older ones, were formed during subsequent tectonic-thermal activity, possibly under the fluid action. The mixed mantle-crustal nature of substrate for the granite melting is indicated by specific isotopic parameters (87Sr/86Sr = 0.703389, εHf(t)aver = +6.3) and a number of characteristic ratios for zircons and granites. The geodynamic concepts of the granite formation settings of the Bitim complex are corrected: in the Vendian–Early Cambrian, a transform-type margin has developed in this sector, the divergent movements on which have been accompanied by a break in the continuity of the crust and the intrusion of a deep mantle diapir; the participation of the slab substance in the magma generation might also be assumed.Conclusions. The results obtained can be used for the geological mapping and correction of a general geodynamic scheme for the junction zone between the Ural Mobile Belt and the East European platform.

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Polychronity and polygeneity of pegmamtites of gneissic-amphibolitic complexes as a result of continuous-discontinuous development of suture zones: Example of the Ufalei metamorphic block in the Middle Urals

Cited by 2 publications

References 0 publications

Principle stages of granite and pegmatite formation in the southeastern part of the Main Sayan Fault

Principle stages of granite and pegmatite formation in the southeastern part of the Main Sayan Fault

New data on the trace element composition and Lu-Hf isotopic system of zircons from the Early Cambrian granites of the Ufaley block (Middle Urals): a step to the correction of geodynamic concepts

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