Volume 27, 4, 2008 |
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V.A. Parovyshny, O.V. Veselov, V.N. Senachin, V.S. Kirienko. Temporal changes in the geophysical fields above the gas deposit (Sakhalin I.) 3 V.V. Zhigulev, M.G. Gurinov, V.V. Yershov. Deep structure of the Yuzhno-Sakhalinsk mud volcano from the results of complex seismic surveys 16 Yu.Ya. Vashchilov, N.K. Gaidai, O.V. Sakhno. Three-dimensional deep density model of the Pautovskiy horst, and its geologic interpretation (Northeast Russia) 22 V.Yu. Timofeev, P.Yu. Gornov, D.G. Ardyukov, Yu.F. Malyshev, Ye.V. Boiko. Results of the GPS measurement data analysis (2003-2006) of the Sikhote-Alin system, the Far East 39 R.A. Oktyabrsky, A.A. Vrzhosek, A.M. Lennikov, T.A. Yasnygina, S.V. Rasskazov, Ye.Yu. Moskalenko, T.A. Velivetskaya. Geochemistry of magmatic rocks of the Koksharovka alkali-ultrabasic massif (Primorye), and results of microelement modeling 50 T.A. Yemelyanova. Petrochemical features of Oligocene-Early Miocene volcaniclastic rocks of the Sea of Japan 63 S.V. Shipunov, Yu.S. Bretshtein, A.V. Zhuravlev. Paleomagnetism in the study of Late Mesozoic deformations in South Primorye 72 N.G. Razzhigaeva, L.A. Ganzei, N.I. Belyanina, T.A. Grebennikova. Stratigraphy of peatbog of Gorobets River valley, and the development of the natural environment of Shikotan Island (Lesser Kuril Range) in the Holocene 82 V.I. Roslikova. New concept of pedogenic Mn-Fe concretion formation in the Russian Far East landscapes 99 Reviews V.G. Moiseenko. The book “The mineral and raw material resources of the Russian Arctic” 107 B.A. Voronov, P.V. Ivashov. The biosphere and life 109 V.A. Parovyshny, O.V. Veselov, V.N. Senachin, V.S. Kirienko Temporal changes in the geophysical fields above the gas deposit (Sakhalin I.) The paper considers results of multiple geophysical observations of the South Lugovskoy gas deposit (southern Sakhalin) carried out from 2003 till 2006. It is shown that the gas deposit is a natural indicator of geodynamic processes taking place both in the deposit proper and beyond its bounds. The package of methods and the practice of observations are suggested for estimation of the degree of efficiency of the sites involved in prospect drilling and as a basis for further development of methods of short-term prediction of seismic events by geophysical methods since sharp changes in the parameters of geophysical fields above the gas-bearing structure occur during the advancing of the seismic impulse, which spreads from the outer source. V.V. Zhigulev, M.G. Gurinov, V.V. Yershov Deep structure of the Yuzhno-Sakhalinsk mud volcano from the results of complex seismic surveys Results of complex seismic surveys carried out by refraction and reflection methods (using longitudinal and transversal oscillations) on the Yuzhno-Sakhalinsk mud volcano are presented. The existence of a dead (about 60–70 years ago) large volcanic formation in the proximity of the active volcano was confirmed. Its external structure was determined. The relation between the discovered intermediate gas-mud chambers and the distinguished tectonic dislocations was established. A supposition was made on the stage-by-stage development of volcanism in the north-eastern direction and its probable relation to recent tectonics of the Central-Sakhalin fault. Yu.Ya. Vashchilov, N.K. Gaidai, O.V. Sakhno Three-dimensional deep density model of the Pautovskiy horst, and its geologic interpretation (Northeast Russia) Based on the results of quantitative interpretation of gravity anomalies, the existence of the non-revealed erosionally granitoid pluton in the core of the Pautovskiy horst (south-eastern end of the Inyali-Debin synclinorium, Northeast Russia) is demonstrated. A three-dimensional density model of the study area has been constructed by methods of new interpretation gravimetry (NIG). The model has been geologically and petrologically interpreted. It corresponds to the necessary conditions for true solving the inverse problem of gravimetry. V.Yu. Timofeev, P.Yu. Gornov, D.G. Ardyukov, Yu.F. Malyshev, Ye.V. Boiko Results of the GPS measurement data analysis (2003-2006) of the Sikhote-Alin system, the Far East The paper offers results of geodynamic research using the GPS method in the territory of the Far East. Measurements by the TRIMBLE-4700 GPS geophones were launched along the Sikhote-Alin profile in 2003. We consider the practical methods of conducting GPS measurements, the problems of choosing measurement sites and the Sikhote-Alin system configuration with reference to the structure of the region. The results of the GPS measurement data analysis (2003-2006) were used for the study of the fault system of the Far East continental margin. Different models of Eaurasia rotation, from the known model NNR-NUVEL-1A to the recent ones, were analyzed. The AR-IR-2006 model was suggested for solid-body rotation of Eurasia with parameters of the rotation pole of 51.045°N latitudinally and 255.842° longitudinally, given the rotation velocity 0.2423°/ m.y. Tentative estimates of parameters of the Amur plate rotation are offered (57.6°±0.5°N, 117.1°±0.5°E and 0.083°±0.004°/ m.y.) using investigation data on the Sikhote-Alin and Transbaikal region. R.A. Oktyabrsky, A.A. Vrzhosek, A.M. Lennikov, T.A. Yasnygina, S.V. Rasskazov, Ye.Yu. Moskalenko, T.A. Velivetskaya Geochemistry of magmatic rocks of the Koksharovka alkali-ultrabasic massif (Primorye), and results of microelement modeling The paper presents new geochemical information on magmatic rocks of the Koksharovka Late Jurassic alkali-ultrabasic massif. Deposits of vermiculite, apatite, and vanadium-bearing titanomagnetite are related to this massif, and placer isoferroplatinum has been also detected. Based on the data first obtained on the rare-earth geochemistry as well as strontium and oxygen-carbon isotopy of carbonatites and associated ijolites and clinopyroxenites together with geological observations made it possible to substantiate the magmatic origin of the Koksharovka carbonatites. The problems of the provenance of the accompanying magmatic rocks are discussed. The microelement modeling of partial melting of the mantle sources has been done to elucidate the genesis of melts of the Koksharovka carbonatites and the hosting sphene-hornblende pyroxenites. The first results of the modeling are given. T.A. Yemelyanova Petrochemical features of Oligocene-Early Miocene volcaniclastic rocks of the Sea of Japan The investigation of the petrographic and geochemical features made it possible to define the geochemical type of the Sea of Japan Oligocene–Early Miocene volcaniclastic rocks. These rocks belong to the high-alumina and high-potassium subalkaline volcanic series. A comparative analysis of the Sea of Japan volcaniclastics revealed spatial and temporal relationships between the Oligocene-Early Miocene surface volcanism of the Sea of Japan and the Late Cretaceous and Eocene–Early Miocene ignimbrite volcanism stages of the East Eurasian margin. This made it possible to refer the Sea of Japan volcaniclastic rocks to the continental-margin rocks of ignimbrite volcanism, whose manifestation was related to periods when the continental margin was relatively “tranquil’ under conditions of general extension. S.V. Shipunov, Yu.S. Bretshtein, A.V. Zhuravlev Paleomagnetism in the study of Late Mesozoic deformations in South Primorye An analysis was done of the available paleomagnetic data from South Primorye. It is shown that they can be interpreted as synfold: magnetization in the studied objects resulted from regional remagnetization approximately during Late Mesozoic folding. Based on the analysis of the parameter characterizing the degree of completeness of folding by the time of regional remagnetization, irregularity in the relief of Late Mesozoic horizontal stresses is shown. The obtained estimations of the degree of completeness of folding are in agreement with geologic evidence and agree fully with the model of formation of tectonic deformations after V. Talitskiy. N.G. Razzhigaeva, L.A. Ganzei, N.I. Belyanina, T.A. Grebennikova Stratigraphy of peatbog of Gorobets River valley, and the development of the natural environment of Shikotan Island (Lesser Kuril Range) in the Holocene The stratigraphy of peatbog of the Gorobets River valley, the largest river on Shikotan Island, is based on spore-and-pollen, diatomic, tephrostratigraphy and radiocarbon dating. The peat began to deposit in Early Holocene, and the place is the most ancient peatbog within the South Kuriles. Nine phases of vegetation development determined by climatic changes are defined. The age, the causes of appearance and disappearance of certain conifers, small-leaved and broad-leaved taxa, and the change of their role in the landscape formation are discussed. Specific features of formation of present-day vegetation of the Lesser Kuril Range as a separate floral region is shown. Besides the climatic changes and sea-level oscillations, relief, land size and the isolation factor played a great role in landscape development. V.I. Roslikova New concept of pedogenic Mn-Fe concretion formation in the Russian Far East landscapes The results of typification of new ferruginous and manganese formations studied in different landscapes, such as subaqueous-superaqueous, superaqueous, and alluvial are offered. The patterns of their distribution in different deposits and soils formed on them are defined. The specific character of the genetic heterogeneity of concretions of single-type morphological forms is shown. Transformations of concretion complexes in the course of the changes in the landscapes are traced. |