Open Access"Diffusive" border of isotopic reservoirs of indian and pacific morb types beneath Kamchatka
Author(s) -
M. Yu. Davydova,
Yu. A. Martynov
Publication year - 2019
Publication title -
doklady akademii nauk. rossijskaâ akademiâ nauk
Language(s) - English
Resource type - Journals
ISSN - 0869-5652
DOI - 10.31857/s0869-56524866691-694
Subject(s) - geology , asthenosphere , convergent boundary , subduction , oceanic crust , lithosphere , mantle wedge , mantle (geology) , mid ocean ridge , pacific plate , earth science , hotspot (geology) , slab , geophysics , seismology , tectonics
The convergence zones of lithospheric plates in the Northwest Pacific are the boundaries of the two main isotopic domains of the Earth - the Indian and Pacific MORB types, separated be cold oceanic lithosphere. This configuration limits of their interaction by special geodynamic environments - the influence of deep plume sources or the distraction of the subducted slab and intrusion of the oceanic asthenosphere into the subcontinental mantle wedge. The latter mechanism is reconstructed in the Central Kamchatka Depression on the basis of geological, geochemical, and high-precision (double-spike) lead isotopic data. The role of the oceanic asthenosphere in magma generation in the zones of convergence of oceanic and continental lithospheres is a poorly studied but not unique phenomenon that must be considered under geodynamic reconstructions and the creation of new, more realistic models of the juvenile continental crust formation.