European Geosciences Union General Assembly 2015 - Garnet Classification
Problem and Subject
GEOSCIENCES UN
EUROPEAN OF
General
Assembly
A worldwide studying of geochemical and mineralogical compositions of garnet peridotite
xenoliths records a variety of cryptic and modal metasomatic events [Sablukov et al., 2008;
Shchukina et al., 2014, 2015 for Arkhangelsk province].
There are as minimum two stage of the modal metasomatic reworking of the lithosphere
mantle [for example model by Griffin et al., 1999]:
1. Carbonate-silicate usually low-T
metasomatism with high rare incompatible
elements contents produced crystallization
of phlogopite, clinopyroxene and
carbonate;
probably it is ancient stage of
metasomatism long before the formation of
kimberlite melts;
2. High-T melt metasomatism during the
ascent of asthenosphere / plume
material and associated with
kimberlite melts;
2015
The model by [Russell et al., Nature 2012] supposes the evolution from proto-kimberlite melts
like as carbonatite to more silicic composition melts (kimberlite-like) by assimilation of mantle.
minerals, (especially orthopyroxene).
?
The subject of this studying is estimate of carbonate and silicate components
contribution in metasomatic processes in the lithospheric mantle
during the forming of Grib kimberlite
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