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Neoarchaean enderbite - granulite complex of the Pulozero - Polnek-Tundra region,
Central-Kola block: stages and thermodynamic regime of evolution (Kola Peninsula)
L.S. Petrovskaya, F.P. Mitrofanov. T.B. Bayanova, V.P. Petrov, M.N. Petrovsky
- Apatity: Print. Kola Science Centre RAS, 2010. - 78 p.
The book presents data obtained in the course of a comprehensive geological,
petrological, and isotope geochemical research of the rocks and minerals from the enderbite-granulite complex of the Pulozero -
Polnek-Tundra region (Central-Kola block) to provide a basis for reconstructing the sequence of endogenous processes,
P-T conditions, and evolutional duration of the enderbite-granulite complex in the interval of 2.72 - 1.81 Ga.
The following three stages of metamorphism have been established in the Kola Group gneisses: I -
early granulitic (2.72 Ga); II - superimposed amphibolitic (2.57 Ga); III - retrograde low-temperature
amphibolitic (2.54 Ga). The early granulitic (I) and superimposed amphibolitic (II) metamorphic events
in the Kola Group gneisses are separated by the enderbite formation (2.66 Ga) and later transformation
of the enderbites into cummingtonite-biotite orthogneisses (2.64 Ga). Ultrametamorphism in the Kola
Group gneisses was accompanied by injections of anatectic veins of microcline-plagioclase granite
with garnet and sillimanite (2.55 Ga). The tectonomagmatic activity in this region culminated by the
injection of veined leucogranites (ca. 2.50 Ga) that cut the Kola Group gneisses, enderbites, and
cummingtonite-biotite orthogneisses. The Sm-Nd and Rb-Sr research data show that the enderbite-granulite
complex was affected by Palaeoproterozoic events that disturbed the isotope systems ca. 2.50 and 1.81
billion years ago.
For specialists in geology, petrology and isotope-geochronology, as well as high school students of
the geological faculties.
Fig. - 30, tabl. - 12, referens - 77.
Reviewer: D.Sc. Yu.A. Balashov; Ph.D. M.I. Dubrovsky