Contents

Tectonics and Geodynamics
A.L.Grokholsky, E.P.Dubinin. Kinematic and morphological regularities of the structure of the spreading axes overlapping zones of the mid- oceanic ridges     3
S.E. Aprelkov, B.V. Ivanov, S.V. Popruzhenko.Tectonic and geodynamic evolution of southeastern Kamchatka     16
V.F.Polin, E.J.Moll-Stolcap.Petrological and geochemical criteria of the structural environment for formation of the Chukchi segment, the Okhotsk-Chukchi volcanic belt    29
Stratigraphy
A.G.Konstantinov, E.S.Sobolev. Biostratigraphic scheme for Carnian and Lower Norian of northeastern Russia. Article 2. New zonal scales and correlation     48
Minerageny
A.A. Gavrilov. Mineragenic asymmetry and dissymmetry of central type structures (CTS) Article 2. The Curie principle and placers and hydrocarbon distribution     61
D.I.Kolesnikov, M.I.Rozinov, N.G.Shatkov.Silver-bearing criteria of the Okhotsk-Chuckchi Belt volcanic structures    70
A.N. Solyanik, R.A. Oktyabrskiy, A.M. Lennikov, Y.P. Pototskiy, B.A. Zarubin, B.I. Sapin.Precious-metal mineralization of massive pyrrhotite lenses in the Dzhugdzhur anorthosites    79
V.Ya.Dantchenko, A.V. Rybin, G.S. Shteinberg. Rhenium-bearing mineralization in the Kuril Islands    85
M.I.Lipkina, I.B.Tsoy.On the age and the phosphate mineralization genesis in the North Yamato Ridge (the Sea of Japan)    99
Geoecology
Z.G.Mirzekhanova, I.D.Debelaya.On the compilation of large-scale ecological maps (with special reference to the regions of gold exploitation)     106
Chronicles and Discussions
N.A.Shilo, V.A.Narseev, L.V.Razin. On the modern status of platinum metal minerals potential of Russia    114
G.M.Vlasov. The modern state and potential for the development of Geotectonics     116
L.A.Maslov. New conceptions in global tectonics. (Symposium in Tsukuba, Japan)     125
Anniversaries
B.I.Vasiliev (70-th birthday)     127

---

A.L.Grokholsky, E.P.Dubinin
Kinematic and morphological regularities of the structure of the axial spreading overlapping zones of the mid- oceanic ridges
Comparative analysis of the kinematic and morphological features of the axial spreading ovelapping zones which are typical for spreading ridges with fast and median splitting rates has been made. There have been distinguished three scale overlapping levels, small (about 3 km in width), large (3-20 km wide), and giant (more than 20 km wide). Length of rift axis segments between the overlaps is greatly varied ranging from 50-70 km in small to 100-200 km in large and giant overlaps . Typical depths of the central basins are tens of meters for small and hundreds of meters for large and giant overlaps. The overlapping structure appears to be various. Overlapped axes are mainly rectilinear in small displacements, whereas large displacements are characterized by axis deflection from each other before co