Open AccessFirst data on the nature and age of the protolith of high-pressure tectonites of Yenisei ridge: a link to the early stage of formation of the Paleoasian Ocean
Author(s) -
И. И. Лиханов,
К. А. Савко
Publication year - 2019
Publication title -
doklady akademii nauk. rossijskaâ akademiâ nauk
Language(s) - English
Resource type - Journals
ISSN - 0869-5652
DOI - 10.31857/s0869-56524846739-744
Subject(s) - protolith , geology , tectonite , geochemistry , basalt , mantle (geology) , fibrous joint , craton , stage (stratigraphy) , petrology , paleontology , metamorphism , tectonics , shear zone , anatomy , medicine
The petrogeochemical characteristics of high-pressure mafic tectonites from the Yenisei suture zone of Yenisei Ridge indicate that N-MORB and E-MORB with an age of 701.6 ± 8.4 Ma were their protolith. The formation of N-MORB with the more primitive chemical composition occurred at the initial stages of spreading, when the upper horizons of the depleted mantle were molten. The high-Ti basalt was formed as the product of melting of the enriched mantle substrate at the later stages of spreading. These events are related to the early stage in the evolution of the Paleo-Asian Ocean on the western margin of the Siberian Craton.