![]() RUSSIAN JOURNAL OF EARTH SCIENCES VOL. 3, NO. 1, PAGES 1–32, doi:10.2205/2001ES000054, 2001
Kola alkaline province in the Paleozoic: evaluation of primary mantle magma composition and magma generation conditionsA. A. Arzamastsev, V. N. Glaznev, and L. V. ArzamastsevaGeological Institute, Kola Research Center, Russian Academy of Sciences, Apatity, Murmansk Region, Russia F. Bea, and P. Montero University of Granada, Dept. of Mineralogy and Petrology, Fuentenueva, Granada, Spain Abstract
[1] This paper is an attempt to estimate quantitatively the chemical
composition and volume of magma, the reactivation of which resulted in the formation
during the Paleozoic of the northeastern part of the Baltic Shield in the Kola alkaline
province. In contrast to the known models, a gravity-based method of 3-D density
modelling was used to evaluate the extent of alkaline magmatism in the province and,
accordingly, to estimate the volume of mantle magma produced during the Paleozoic
cycle of activity. During the early period of study, along with sample collection and
geochemical analyzes, the deep structure of the province was investigated, and 3-D
density models were derived for all alkaline intrusions of the province to a depth of
22.5 km. The next step included the high-precision determinations of trace element
concentrations in the rocks using an ICP-MS method as a basis for calculating the
weighted mean concentrations of these elements in the rocks of the province, deriving
models for mantle rock melting, and estimating the geodynamic consequences of these
mantle processes.
The calculations showed that the total volume of the Paleozoic magma
produced in the NE part of Fennoscandia had been 15000
Received 19 July 2001; published 31 July 2001. Keywords: Alkaline magmatism, mantle melting, Baltic shield. ![]() Citation: Arzamastsev, A. A., V. N. Glaznev, L. V. Arzamastseva, F. Bea, and P. Montero (2001), Kola alkaline province in the Paleozoic: evaluation of primary mantle magma composition and magma generation conditions, Russ. J. Earth Sci., 3, No.1, 1-32, doi:10.2205/2001ES000054. Version of this paper in Russian Copyright 2001 by the Russian Journal of Earth SciencesPowered by TeXWeb (Win32, v.2.0). |