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Magmatism evolution and carbonatite-granite association in the neoproterozoic active continental margin of the Siberian craton: Thermochronological reconstructions |
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| Authors: | A E Vernikovskaya V M Datsenko V A Vernikovsky N Yu Matushkin Yu M Laevsky I V Romanova A V Travin K V Voronin E N Lepekhina |
| Institution: | 1315. Trofimuk Institute of Petroleum Geology and Geophysics, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia 2315. Krasnoyarsk Research Institute of Geology, Geophysics and Mineral Resources, Krasnoyarsk, Russia 3315. Novosibirsk State University, Novosibirsk, Russia 4315. Institute of Computational Mathematics and Mathematical Geophysics Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia 7315. School of Earth, Environmental and Biological Sciences, Queensland University of Technology, Brisbane, Australia 5315. Sobolev Institute of Geology and Mineralogy Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia 6315. Karpinsky Russian Geological Research Institute, Saint Petersburg, Russia |
| Abstract: | Neoproterozoic carbonatites and related igneous rocks, including A-type granites in the Tatarka-Ishimba suture zone of the Yenisey Ridge are confined to a horst-anticlinal structure that was formed in a transpression setting during the oblique collision between the Central Angara terrane and the Siberian craton. The carbonatites, associating mafic (including alkaline) dikes as well as the Srednetatarka nepheline syenites are the oldest igneous formations of the Tatarka active continental margin complex. Geochronological data indicate that magmatic evolution continued in the studied anticline for nearly 100 m.y. On the earliest stage carbonatites were formed and on the last stage — the emplacement of mantle-crustal A-type Tatarka granites took place. According to new U/Pb zircon studies, the earliest rocks in the Tatarka pluton are A-type leucogranites aged 646 ± 8 Ma. The younger 40Ar/39Ar ages of carbonatites obtained for phlogopites (647 ± 7 and 629 ± 6 Ma) are related to the last tectonic events in the studied region of the Tatarka-Ishimba suture zone, which are coeval with the formation of the A-type granitoids (646–629 Ma). |
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