Plagioclasites from chromite-bearing ultramafic rocks of the Rai-Iz massif

The corundum-bearing and without-corundum plagioclasites from chromite-bearing ultramafic rocks of Rai-Iz massif were studied. Chemical composition of the rock-forming minerals and rock geochemical characteristics was determined. The U-Pb zircon dating (using SHRIMP-II microprobe) of plagioclasites...

Full description

Bibliographic Details
Main Authors: N. V. Vakhrusheva, K. S. Ivanov, A. E. Stepanov, S. P. Shokalsky, A. N. Azanov, V. V. Hiller, P. B. Shiryayev
Format: Article in Journal/Newspaper
Language:English
Russian
Published: A.N. Zavaritsky Institute of Geology and Geochemistry 2016
Subjects:
ультрамафиты
плагиоклазиты
полярный урал
цирконы
u-pb датирование
возраст
палеозой
ultramafic rocks
plagioclasites
polar urals
zircons
u-pb dating
age
paleozoic
Engineering geology. Rock mechanics. Soil mechanics. Underground construction
TA703-712
Полярный Урал
Online Access:https://doaj.org/article/3ce53538331d42bdb9eb93f491d0814f
Description
Summary:The corundum-bearing and without-corundum plagioclasites from chromite-bearing ultramafic rocks of Rai-Iz massif were studied. Chemical composition of the rock-forming minerals and rock geochemical characteristics was determined. The U-Pb zircon dating (using SHRIMP-II microprobe) of plagioclasites yielded an age of 398 ± 3 and 404.4 ± 2.8 Ma - Lower-Middle Devonian boundary. At that time on the background of powerful collision it occurred a deep metamorphic processing of Rai-Iz ultramafic rocks resulting in forming of high-chromium chromite ore and separation of vein-series represented by substantially plagioclase rocks with corundum (ruby) mineralization.

Similar Items