Contents

Tectonics and Geodynamics
L.M.Parfenov, W.J.Nokleberg, A.I.Khanchuk. Compilation principles and the main units of the legend of the Geodynamic Map of North and Central Asia, Russia’s Far East South, Korea and Japan    3
V.V. Golozubov, Lee Dong Woo, G.L. Amel’chenko. The role of horizontal displacements during the formation of the Razdol’nenskiy epicontinental basin (South Primorye, Russia) in the Cretaceous period    14
Stratigraphy and Sedimentology
V.S.Vishnevskaya, N.A.Bogdanov, G.Ye.Bondarenko. Boreal mid Jurassic - Early Cretaceous Radiolaria of Kamchatka, Okhotsk Sea coast      22
Yu.D.Zakharov, N. G.Ukhaneva, A.V.Kiseleva, G.V.Kotlyar, A.P.Nikitina, J.Tazawa, V.I.Gvozdev, A.V.Ignatyev, A.K.Cherbadzhy. Stable carbon isotopes and Са/Mg ratio in the Permian limestones of Kitakami (Japan) and Primorye, and their correlation     36
G.G.Filippova. Grebenka floral assemblage in the Anadyr' River basin (Chukotka)    50
T.I.Lin’kova, Yu.Yu.Ivanov. Quaternary sediment thicknesses, the Pacific north-western segment     61
Mineralogy and Geochemistry
A.Yu.Antonov. Rare-earth elements in Late Mesozoic granitic rocks of the southern boundary of the Aldan shield     68
M.I.Lipkina. Phosphatic accompanying mineralization in magmatic rocks of the underwater volcano Chentsov (the Sea of Japan)     81
G.N.Gamyanin, V.I.Goncharov, N.A.Goryachev. Gold and rare-metal deposits of Northeast Russia    94
Metallogeny
V.G. Khomich, A.S. Vakh,V.V. Ivanov, A.V. Zinkov, I.I.Fatyanov, G.R.Sayadyan, G.B. Molchanova, Liu Liandeng, Liu Yunliang, Wu Gouxue, Zhu Yongzheng Precious metal mineralization of contiguous territories of Russia’s Far East and Northeast China     104
G.V.Roganov. Ore potential of the Imangakitsky and Kuranakhsky anorthosite massifs (the Aldan-Stanovik shield)    113
Cronicles
N.A.Shilo, N.G.Patyk-Kara, E.M.Kamshilina. XI International meeting on geology of placers and deposits of crust of weathering    126

L.M.Parfenov, W.J.Nokleberg, A.I.Khanchuk
Compilation principles and the main units of the legend of the Geodynamic Map of North and Central Asia, Russia’s Far East South, Korea and Japan
Within the framework of the International Scientific Project on Tectonics, Geodynamics and Metallogeny, a map at a scale of 1: 5000000 is being compiled covering the territory of East and South Siberia, Mongolia, Northeast China, Russia’s Far East South, Korea and Japan. The paper discusses the principles and the content of terrane analysis on which the map is based, and gives definitions of key notions: craton, terrane, accretion, amalgamation, dispersion, etc. The mapped different-type terranes, overlying and “suturing” them assemblages, which are classified on the basis of the principles of actualism, are explained. A possibility is discussed of distinguishing terranes in the cratons’ Early Precambrian basement.

V.V. Golozubov, Lee Dong Woo, G.L. Amel’chenko
The role of horizontal displacements during the formation of the Razdol’nenskiy epicontinental basin in the Cretaceous period (South Primorye, Russia)
The Razdol’nenskiy basin occupies an area of around 3000 km2 and is formed of grey-coloured Barremian-Albian (Nikanskaya series) coal-bearing deposits and variegated Albian-Cenomanian (Korkinskaya series) deposits. These deposits form three ENE-trending brachysynclines. Along the south-eastern slopes of the synclines, a series of thrusts of the same trend was determined, gently dipping chiefly to the south-east. Anticline elevations that divide these synclines are traced by outcrops of the pre-Cretaceous basement or by bands of their shallow occurrence. Along the western margin of the basin, is the West-Primorye fault zone of meridional orientation. It is most likely, that the filling of the basin occurred against the background of regional compression in the NNW-SSE direction. Near the West Partizanskiy fault, possibly due to that compression, a ENE-trending thrust system formed, on which the pre-Cretaceous basement blocks were overthrusted against each other. The lying sides of the thrusts, subsided to more than 2000 m deep, could correspond to the areas of chiefly lake deposits of maximum thickness. The relatively uplifted frontal parts of the thrusts as well as the basin margins were at that time the areas of erosion or a slow alluvial-proluvial deposition. NNW-orientation of regional compression determined for the Cretaceous period of the Sikhote-Alin, Korean peninsula, and Eastern China is also reconstructed for the Razdol’nenskiy basin, which is evidence of a common development of these regions during that time.

V.S.Vishnevskaya, N.A.Bogdanov, G.Ye.Bondarenko
Boreal mid Jurassic - Early Cretaceous Radiolaria of Kamchatka, Okhotsk Sea coast
Middle Jurassic radiolarians were collected from the red chert of the lowermost ectonic sheet of the Omgon Ridge. This is the first finding of Jurassic radiolaria in Kamchatka. All species are documented and 5 endemic species are described. The mid-Jurassic radiolarian assemblage is characterized by low diversity and strong dominance of nassellarians, which make up more than 90%. The dominant genera are represented by Stichocapsa, Parvicingula, Archaeodictyomitra and Xitus. The Omgon Range (Okhotsk Sea coast, Western Kamchatka) includes intensely deformed tectonic units, some of which consist of volcanogenic rocks and siliceous sediments, whereas others are represented by terrigenous turbidites. All these formations were considered so far to be not older than Early Cretaceous. The volcanogenic and siliceous rocks form three separate tectonic sheets. Upper Jurassic to Lower Cretaceous radiolarian assemblages were found in rocks associated with pillow basalts in the upper part of the third (from bottom) tectonic sheet. Their age is controlled by Buchias. The description of the Tithonian-Valanginian radiolarians is also carried out.

Yu.D.Zakharov, N.G.Ukhaneva, A.V.Kiseleva, G.V.Kotlyar, A.P.Nikitina, J.Tazawa, V.I.Gvozdev, A.V.Ignatyev, A.K.Cherbadzhy
Stable carbon isotopes and Са/Mg ratio in the Permian limestones of Kitakami (Japan) and Primorye, and their correlation
Artinskian-Early Bolorian, Early, Middle and Late Midian events recorded by an anomalously high value of d13C (3,5-4,7‰) and a more or less drop in Ca-Mg ratio in the black Sakamotozawa limestone (middle Kobayama),in the Lower, Middle and Upper Kanokura limestone of Kitakami and their equivalents in Primorye seem to be explained by high biota productivity of marine basins of that time in the conditions of transgressions and warm humid climate. An analogous Early Dzhulfian event registered in South Primorye as well as in Western Europe, Salt Range and Texas, was not determined in Japan because a significant part of the lowermost Dzhulfian deposits in Kitakami is represented by terrigenous sediments.

G.G.Filippova
Grebenka floral assemblage in the Anadyr' River basin (Chukotka)
The Grebenka floral assemblage on the right bank of the Anadyr River (Krivorechenskaya suite) is divided into the lower and upper subassemblage. The lower one originated from deposits on the Malaya Grebenka, Srednyaya Orlovka and Beryozovaya Rivers. Its age is specified as Late Alvian - Earliest Cenomanian on the basis of both floral and faunal remains in the Malaya Grebenka River. The upper subassemblage of the Grebenkinsky complex was derived from deposits on the Grebenka (Yeliseevsky outcrops), Chukotskaya, Bystraya (right bank of the Anadyr River) and Krivaya Rivers, Vetvistaya River, right tributaries of the Ubienka R. (left bank of the Anadyr R.). The upper subcomplex is dated as Cenomanian; possibly, Cenomanian - Earliest Turonian, according to flora-bearing layers of the Krivorechenskaya suite comformably overlapped by marine deposits of the Dugovskaya suite with Turonian fauna.

T.I.Lin’kova, Yu.Yu.Ivanov
Quaternary sediment thicknesses, the Pacific north-western segment
With the use of paleomagnetic stratigraphy of deep-water bottom sediments, an attempt was made to determine the quantitative sediments distribution during the Quaternary period for the Pacific north-western part. Three maps of sediment thickness and sedimentation rates for the given time interval were compiled which are limited by the magnetometric scale boundaries: the boundary of Brunhes-Matuyama chrons is 0-700 000 years; the beginning of Jaramillio subchron – the boundary of Brunhes-Matuyama chrons – 700-950 000 years; the beginning of Jaramillio subchron – the end of Oldway subchron – 950-1670 000 years. The sediment thickness accumulated during the mentioned time intervals are shown as isopachs, the choice of which for each map corresponds to the numerical values of the average sedimentation rates.
It is shown that for all the Pacific north-western part an increase in sedimentation rates and differentiation of sediment distribution by the end of paleomagnetic Matuyama chron took place. The maximum sedimentation rates are referred to the last 700 000 years (paleomagnetic Brunhes chron).

A.Yu.Antonov
Rare-earth elements in Late Mesozoic granitic rocks of the southern boundary of the Aldan shield (Stanovik Range)
The distribution of the REE spectrum and other elements in most varieties of Late Mesozoic Stanovik Range granitoids was studied for the first time. The investigation revealed the following features:
- Granodiorite (?)-garnet-leucogranite assemblages within the corresponding massifs of the intrusive Stanovik Range complex cannot generally result from fractional differentiation of one initial dioritic (monzonitic) or quartz-dioritic magma. In many cases an independent formation of leuco- and melanocratic regional granitoids is recorded. The latter are most likely to be the products of mixing of compositionally contrasting, highly SiO2-saturated and basaltic magmas.
-    By their high REE concentrations, the Late Mesozoic granitic rocks of the Stanovik Range in the most degree correspond to magmatic formations of rifting interior continental zones, similar in age, alkalinity and SiO2 saturation. To a lesser degree they are close to magmatic formations of active continental margins, and to the least degree, to the corresponding island arc volcanic rocks.
-    Unlike granites and leucogranites, there is lateral zoning in the REE distribution in the most mafic north-western granitoids of the Stanovik Range. So, their rocks are characterized by a gradual increase in the sum REE concentrations and La/Yb values. This occurs against the background of total increasing in alkalinity, potassium alkalinity and lithophile element concentrations of these rocks. This zoning is similar to the zoning in volcanic rocks found across the island arcs and active continental margins, from their frontal to marginal zones of volcanism.

M.I.Lipkina
Phosphatic accompanying mineralization in magmatic rocks of the underwater volcano
Chentsov (the Sea of Japan)
In the Sea of Japan the largest ore occurrence of phosphorites is located on the underwater volcano Chentsov. Phosphorites are mainly associated with subalkaline basalts and their tuffs, and also with hydrothermal quartz-glauconitic rocks (hydrothermalites). Volcanic rocks are phosphorized and glauconitized and contain about O,46-1O,78% P2O5. Francolite was found in the pores and cracks of basalts, and in tuff cement in paragenesis with glauconite and pyrite. Crystalline differentiation of minerals from one solution in sequence: glauconite - pyrite – francolite is substantiated. We assume that the source of elements, which are necessary for minerals formation, is of endogenic nature. Brief description of exogenous minerals is given, and a high velocity of their formation (not in thousand and million of years, but in days and months) is emphasized.

G.N.Gamyanin, V.I.Goncharov, N.A.Goryachev
Gold and rare-metal deposits of Northeast Russia
A large group of gold-ore deposits genetically related to the Late Mesozoic granitoids is analyzed. Three genetic types of such deposits are distinguished: gold-skarn, gold-greisen, and gold and rare-metal-quartz lode. Ore bodies are represented by veins, stockworks, metasomatic impregnated and massive deposits of various form. Close association of early gold with sulphoarsenides and arsenides of iron, nickel and cobalt, and of late gold with the minerals of bismuth ( native bismuth, bismuthine, ikunolite, tellurides and sulphotellurides) are observed in the composition of the ores.
Gold in the ores is small and submicroscopical, but in gold-skarn and gold-greisen deposits 90% of gold is less than 0.1 mm, in gold and rare-metal-quartz lode deposits - 60% of gold is less than 0.1 mm. The fineness of gold is noted within a wide ranges ( 400-950 promille). The distribution of gold in ores is irregular, often a bonanza one in the lode type. The resources of metal are small (1-30 t) with an average content of 7-15 g/t. Gold and rare-metal mineralization was formed at a temperature of 200-3600C and a pressure of 500-2000 bar in gradient conditions from the predominantly chloride and relatively concentrated solutions with a high potential of arsenic and in a recovering environment. Geological, mineralogical-geochemical, and thermobarogeochemical data show the genetic relation of gold and rare-metal mineralization with granitoids of I-type of the ilmenite and magnetite series that appeared in the environments of collisions and marginal-continental magmatic arcs.

V.G Khomich., A.S. Vakh ,V.V. Ivanov., A.V.Zinkov, I.I.Fatyanov, G.R.Sayadyan, G.B. Molchanova, Liu Liandeng, Liu Yunliang, Wu Gouxue, Zhu Yongzheng
Precious metal mineralization of contiguous territories of Russia’s Far East and Northeast China
A comparative analysis of gold content of the contiguous territories of China and the Russian Far East showed that the South-Khanka and South-Bureya metallogenic zones are promising for gold and other precious metals. High- prediction evaluation of these territories is based on their evolution in a similar geotectonic environment, on the presence of black-shale and carbonaceous units in the geological sections, saturation with magmatic formations, and above all, on the presence in the adjacent districts of large and middle-size gold deposits, including those of rare geological-economic types.
Possible realization of the projects on international collaboration in developing resources of the Russian East strongly requires a quick complex evaluation of mineral resources of these metallogenic zones.

G.V.Roganov
Ore potential of the Imangakitsky and Kuranakhsky anorthosite massifs
The Imangakitsky and Kuranakhsky massifs are the characteristic representatives of moderately differentiated autonomous anorthosite plutons of the Early Precambrian stage of the Earth evolution. The lower levels of the sections of their layered series are formed mainly of gabbro and gabbro-anorthosites, and are overlain by andenisites, labradorites, jortunites and enderbite-jortunites. Vein series are represented by fine-grained gabbro and gabbro-norites, rare andesinites, quartz andesinites, pyroxenites and peridotites. The Imangakitsky massif is of plate form, north-westwardly submerging at angles of 12-250. The Kuranakhsky massif is, probably, a fragment of a large loporite, whose southern part is truncated by the Imangrsky fault. The weighted average chemical composition of the massifs’ layered series correspond to high-alumina andesite-basalts. P-Fe-Ti mineralization of early- and post-magmatic types is associated with the gabbro-norites and norites of the layered and vein series. The ores of the early magmatic stage are predominantly impregnated and banded. Among the ores of the post-magmatic stage there are massive, streaky-impregnated and nesty-impregnated ores. The specific features of distribution, substance composition and technological properties of the ores of each type were considered.