The age of high-pressure metasomatism in shear zones during collision-related metamorphism in the Lapland granulite belt: The Sm-Nd method of dating the paragenesises from sillimanite-orthopyroxene rocks of Por’ya Guba nappe

The Sm-Nd isotope-chronological method is used for the first time to investigate the whole rock and rock-forming minerals from metasomatic sillimanite orthopyroxene rocks in the Por’ya Guba nappe of the Lapland granulite belt. As a result isochrone values of the age are obtained, which allows estima...

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Bibliographic Details
Published in:Doklady earth sciences 2010-05, Vol.432 (1), p.602-605
Main Authors: Lebedeva, Yu. M., Glebovitskii, V. A., Bushmin, S. A., Bogomolov, E. S., Savva, E. V., Lokhov, K. I.
Format: Article
Language:English
Subjects:
Analysis
Earth and Environmental Science
Earth Sciences
Estimating techniques
Geochemistry
Geophysics
High temperature
Isotopes
Metamorphism
Metamorphism (Geology)
Methods
Mineralogy
Rocks
Rocks, Metamorphic
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Summary:The Sm-Nd isotope-chronological method is used for the first time to investigate the whole rock and rock-forming minerals from metasomatic sillimanite orthopyroxene rocks in the Por’ya Guba nappe of the Lapland granulite belt. As a result isochrone values of the age are obtained, which allows estimate the minimum time intervals that have passed from the moment of formation of the investigated rocks. They indicate that peak conditions of collision metamorphism in fluid-permeable shear zones of the LGB occurred in the Paleoproterozoic Svekofennian age when high-temperature high-pressure sillimanite-orthopyroxene metasomatic rocks were formed. The obtained data make it possible to assume that, with regard to the measurement errors, high-pressure metasomatism did not last over 10 Ma, and this process did not coincide in time with older medium pressure metamorphism.
ISSN:1028-334X
1531-8354
DOI:10.1134/S1028334X10050119