First Data on the Age and P–T Formation Conditions of Zones of Low-Angle Dip Schistosity of the Belomorian Mobile Belt

The low-angle dip schistosity zones of the Belomorian mobile belt of northern Karelia are zones of plastic flow of thrust origin. They were formed from 1.85 to 1.90 Ga: 1879 ± 21 Ma according to 40 Ar/ 39 Ar for amphibole from amphibolites and 1857 ± 13 Ma according to the Sm–Nd isochron in amphibol...

Full description

Saved in:
Bibliographic Details
Published in:Doklady earth sciences 2018-05, Vol.480 (1), p.618-623
Main Authors: Kozlovskiy, V. M., Travin, V. V., Travin, A. V., Savatenkov, V. M.
Format: Article
Language:English
Subjects:
Amphiboles
Amphibolites
Earth and Environmental Science
Earth Sciences
Geochemistry
Isotopes
Magma
Metamorphic rocks
Metamorphism
Metamorphism (Geology)
Plastic flow
Plastics
Rocks
Citations: Items that this one cites
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The low-angle dip schistosity zones of the Belomorian mobile belt of northern Karelia are zones of plastic flow of thrust origin. They were formed from 1.85 to 1.90 Ga: 1879 ± 21 Ma according to 40 Ar/ 39 Ar for amphibole from amphibolites and 1857 ± 13 Ma according to the Sm–Nd isochron in amphibolites. The P – T parameters of rock metamorphism in low-angle dip schistosity zones correspond to the boundary of amphibolite and granulite facies of metamorphism: T = 640–765°C, rarely rising to 826°C; P = 8.0–11.7 kbar. The hypothesis of the two-stage Paleoproterozoic metamorphism of rocks of the Belomorian mobile belt was introduced.
ISSN:1028-334X
1531-8354
DOI:10.1134/S1028334X1805015X