Major epochs of intrusive magmatism of Kuznetsk Alatau, Altai, and Kalba (from U-Pb isotope dates)
Major epochs of intrusive magmatism of Kuznetsk Alatau, Altai, and Kalba (from U-Pb isotope dates)
Russian Geology and Geophysics (August 2001) 42 (8): 1089-1109
- absolute age
- adamellite
- Altai Mountains
- Altai Russian Federation
- Altai-Sayan region
- Asia
- biotite granite
- Central Asia
- Commonwealth of Independent States
- dates
- Eastern Kazakhstan
- Gorny Altai
- granites
- granodiorites
- igneous rocks
- intrusions
- Kalba Range
- Kazakhstan
- Kuznetsk Alatau
- leucogranite
- magmatism
- Mesozoic
- Neoproterozoic
- nesosilicates
- orthosilicates
- Paleozoic
- plutonic rocks
- Precambrian
- Proterozoic
- Rudny Altai
- Russian Federation
- silicates
- tectonics
- terranes
- U/Pb
- upper Precambrian
- Vendian
- West Siberia
- Zaisan Basin
- zircon
- zircon group
We present new U-Pb isotope dates for zircons from intrusive rocks of Kuznetsk Alatau, Gorny Altai, Rudny Altai, and Kalba and generalize the earlier published results of geochronological studies in these regions (U-Pb and Rb-Sr dates). Comparison of radiological ages with geological data permitted us to refine the scale of intrusive-magmatism events and recognize seven major epochs corresponding to a successive change of geodynamic settings: V-Je1 - accretion-subductional, related to the evolution of sea-margin-island-arc systems of the Paleo-Asian ocean; Je2-O1 - accretion-collisional; D1-D31 and D32-C1t - accretion-subductional, related to the evolution of active continental margin of the Andean type; C1v-C3 - accretion-collisional, related to the oblique collision of the Dzhungar microplate with the Siberian continent and closure of the Ob'-Zaisan paleoocean basin; P1-T2 - postcollisional, realized in the strike-slip motion regime; and T3-J1 - within-plate magmatism.
