Variations in the Pb isotope composition in polyformational magmatic rocks of the Ketkap–Yuna igneous province of the Aldan Shield: Evidence for mantle–crust interaction

Polin, V. F.; Dril, S. I.; Ханчук, А. И.; Velivetskaya, T. A.; Vladimirova, T. A.; Il’ina, N. N.

doi:10.1134/s1028334x16060143

Dokl. Earth Sc.

2016

DOI: 10.1134/s1028334x16060143

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Variations in the Pb isotope composition in polyformational magmatic rocks of the Ketkap–Yuna igneous province of the Aldan Shield: Evidence for mantle–crust interaction

V. F. Polin

S. I. Dril

А. И. Ханчук

et al.

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2024

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Cited by 2 publications

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Age, Conditions and Sources of Igneous Rocks of Gora Rudnaya (Southern Yakutia)

Guzev,

Leontiev,

Belyatsky

et al. 2024

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The paper presents the results of a complex petrogeochemical and isotope-geochemical (Rb–Sr and Sm–Nd systems) study of alkaline syenites and ore-bearing metasomatites (beresites) of the Gora Rudnaya (Southern Yakutia, Russia), as well as a comparison with compositionally similar massifs of the Aldan Mesozoic igneous province. The Gora Rudnaya, together with the recently discovered Morozkinskoye deposit, is located within the Central Aldan ore region. The massif is composed predominantly of alkaline syenites with a minor amount of alkaline porphyritic syenites, which are intruded by later dikes and sills of alkaline syenite porphyries and calc-alkaline lamprophyres. Industrial gold mineralization is confined to beresitization zones (Qz–Ser– Ank–Py) in areas of intense metasomatic reworking of rocks along steeply dipping fault structures within the intrusion. The obtained Rb–Sr age values for ore-bearing metasomatites (132±1 Ma) indicate subsynchronism of the ore process and crystallization of alkaline syenites, which corresponds to the time of manifestation of the main stage of magmatism in the Aldan Mesozoic igneous province (150–115 Ma). The rocks of the Gora Rudnaya do not differ in petrogeochemical and isotope-geochemical characteristics from rocks of similar composition from other massifs of the Aldan Mesozoic igneous province, indicating a wide lateral distribution of enriched EM I type mantle beneath the studied region. Variations in the initial isotopic composition of neodymium ((143Nd/144Nd) : from 0.511375 to 0.511636) in the studied samples are probably due to the heterogeneity of the source composition. At the same time, the calculated model ages indicate that the enriched mantle source was formed no later than 2.0–2.5 Ga.

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Age, Conditions and Sources of Igneous Rocks of Gora Rudnaya (Southern Yakutia)

Guzev,

Leontiev,

Belyatsky

et al. 2024

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Alkaline–Salicic Kurung Complex of the Ket-Kap–Yuna Igneous Province (Aldan Shield, Russia): Petrogenesis and Geodynamic Conditions of Formation

Polin,

Ostapenko

2024

Russian Geology and Geophysics

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—Integrated geological data, petrogeochemical characteristics of magmatites of the Kurung complex (the Ket-Kap–Yuna igneous province of the Aldan Shield), and previously published isotopic data along with the results of geochronology and geochemistry research provide evidence for this complex evolving in the Late Cretaceous in a setting of riftogenesis (final phase) of continental margins. Similar to the Late Jurassic–Early Cretaceous polyformational volcano-plutonism of the Aldan Shield, the Late Cretaceous alkaline magmatism in the Ket-Kap–Yuna province is associated with the tectonomagmatic activation which manifested itself mainly as continental margin rifting associated with deep reorganization of the southwestern, southern and southeastern framing of the Siberian craton triggered by gravitational sliding of the lithospheric plates. Results of the petrogeochemical analysis of the studied magmatites revealed that the heterogeneous rock groups identified within this rock complex are not related to each other by fractional or other type of differentiation, thus suggesting their possible derivation as a result of fluid syntexis-type interaction between mantle-derived alkali–basite melt and felsic crustal melts. Alkali–basite parent melts are shown to have formed during partial melting of variably enriched mantle which is widely spread beneath the Aldan Shield and is varied in composition (from BSE enriched to nearly EM-I). Origination of such deep-seated melts (magma sources) was associated with the rifting processes (strike-slip tectonics) triggered by the setting of gravitational sliding of lithospheric plates. The formation of alkaline–salic magmas of the Kurung complex is associated with large-scale selective assimilation of crustal material by high-temperature fluidized mantle magmas during their ascent to the surface, possibly as a result of fluid syntexis of alkaline–basite mantle magmas and crustal smeltings formed under their influence.

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Variations in the Pb isotope composition in polyformational magmatic rocks of the Ketkap–Yuna igneous province of the Aldan Shield: Evidence for mantle–crust interaction

Cited by 2 publications

References 9 publications

Age, Conditions and Sources of Igneous Rocks of Gora Rudnaya (Southern Yakutia)

Age, Conditions and Sources of Igneous Rocks of Gora Rudnaya (Southern Yakutia)

Alkaline–Salicic Kurung Complex of the Ket-Kap–Yuna Igneous Province (Aldan Shield, Russia): Petrogenesis and Geodynamic Conditions of Formation

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