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Vol. 3 (2000 year), No. 2

Dudkin O.B.
On the alkaline plutones orebearing problem

The representative material on alkaline massifs of the Kola region and data on other alkaline provinces of the world make it possible to consider common peculiarities of deposits genesis processes in alkaline plutons. The majority of these deposits are those of the non-coherent elements of the mantle: Ti, P, Zr, Nb, Ta, REE, Sr and Ba. High complexity of the elementary composition of the initial alkaline magmas are responsible for the generation of deposits. A concentration supersaturation (supercooling) in crystallizing systems and separation of mineral phases on their plasticity plays an essential role in the generation of deposits. The space coexistence of monomineral rocks and concentration of the rare elements in deposits of the alkaline massifs is considered.

(in Russian, стр.8, fig. 3, tables. 1, ref 24, MS Word 95, MS Word 95 69 Kb)

Vol. 5 (2002 year), No. 1

Dudkin O.B.
Phanerozoic weathering crusts in the alkaline massifs of the Kola region

The research of the weathering crusts in the North-Eastern Baltic shield was organized in 1956 at the Geological institute of the Kola branch of Academy of Sciences of USSR by academician A.V. Sidorenko. It has resulted in developing of the largest in the world vermiculite deposit and industrial deposit of hypergene apatite in Kovdor. Based on weathering crusts' composition two stages of the crusts' formation were revealed: in the Upper Cretaceous - Paleogene (1) and Neogene (2). Now this scientific direction is getting wider theoretical and practical importance. Isotope dating of the crusts are of special interest for geodynamic construction. Nowadays the character of hypergene processes is of fundamental importance in ecology. Hypergene processes influence on stability of mining querry, on safety of tailings dumps concentration and natural water composition.

(in Russian, стр.6, fig. 1, tables. 2, ref 32, MS Word 95, MS Word 95 75 Kb)