I.S. Chuvashova 1,2, S.V. Rasskazov 1,2, E.V. Saranina 1,3
1Institute of the Earth's Crust SB RAS, Irkutsk, Russia
2Irkutsk State University, Irkutsk, Russia
3 Institute of Geochemistry, Russian Academy of Sciences, A.P. Vinogradov SB RAS, Irkutsk, Russia
Chuvashova Irina Sergeevna,
candidate of geological and mineralogical sciences
664003 Irkutsk, st. Lenina, d. 3,
Irkutsk State University, Faculty of Geology,
assistant professor,
664033 Irkutsk, st. Lermontova, d. 128, Institute of the Earth's Crust SB RAS,
Senior Researcher,
tel.: (3952) 51–16–59,
еmail: chuvashova@crust.irk.ru.
Rasskazov Sergei Vasilievich,
doctor of geological and mineralogical sciences, professor,
664003 Irkutsk, st. Lenina, 3,
Irkutsk State University, Faculty of Geology,
Head of the Department of Dynamic Geology,
664033 Irkutsk, st. Lermontova, 128, Institute of the Earth's Crust SB RAS,
Head of the Laboratory of Isotopy and Geochronology,
tel.: (3952) 51–16–59,
еmail: rassk@crust.irk.ru.
Saranina Elena Vladimirovna,,
candidate of geological and mineralogical sciences,
664033 Irkutsk, st. Lermontova, 128, Institute of the Earth's Crust SB RAS,
Lead Engineer,
tel.: (3952) 51–16–59.
Abstract. The results of determinations of Pb isotope ratios in Late Cenozoic volcanic rocks of the southwestern part of the Baikal rift system along the Kitoi-Baidrag transect are presented. The obtained 207Pb–206Pb estimates of the restite material incubation time in the springs are in good agreement with the Precambrian dating of ensembles of ancient continental blocks and ophiolite belts exposed on the Earth's surface. The sources are distinguished along the transect: the ancient Gargan block of the Tuva-Mongolian microcontinent (massif) with the Hadean protolith and Archean-Neoproterozoic events; Khangai and, possibly, Dzhida-Khangai slabs, and the ancient Baidrag block, a fragment of the Tarbagatai-Dzabkhan microcontinent. According by the dating of the sources, the tectonosphere of the early and middle mantle geodynamic epochs in the Baikal-Mongolian region included 3 layers: lower (proto-mantle), middle (mantle evolved), and upper (crust-mantle transition, CMP). In the Khangai continental domain, the protoliths of a wide Precambrian age range of sources were generally modified about 660 Ma ago. At the end of the Neoproterozoic and in the Early-Middle Phanerozoic, the mantle stabilized against the background of transformations of the ILC zone. In the tectonosphere of the latest geodynamic stage, the processes of transformation of three layers became active again: the proto-mantle, the evolved mantle, and the IMF.
Keywords: сonvergence, 207Pb–206Pb dating, volcanic rocks, ophiolites, Hadean, Archean, Proterozoic, Cenozoic.
P. 61–90
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