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1.
R. A. Oktyabrsky A. A. Vrzhosek A. M. Lennikov T. A. Yasnygina S. V. Rasskazov E. Yu. Moskalenko T. A. Velivetskaya 《Russian Journal of Pacific Geology》2008,2(4):325-335
New geochemical data are presented on the magmatic rocks of the Late Jurassic Koksharovka alkaline-ultrabasic massif, which is associated with deposits of vermiculite, apatite, V-bearing titanomagnetite, and placer isoferroplatinum. The REE geochemistry and strontium, oxygen, and carbon isotopic composition of carbonatites and related ijolites and pyroxenites, together with geological observations, point to the magmatic origin of the Koksharovka carbonatites. The origin of associated magmatic rocks is discussed. Trace element modeling of partial melting of mantle sources was conducted to decipher the genesis of the melts of the Koksharovka carbonatites and host titanite-kaersutite pyroxenites. 相似文献
2.
G. A. Valui E. Yu. Moskalenko A. A. Strizhkova G. R. Sayadyan 《Russian Journal of Pacific Geology》2008,2(2):150-157
The Cretaceous-Paleogene granites of the Eastern Sikhote Alin volcanic belt (ESAVB) and Late Cretaceous granitoids of the Tatibin Series (Central Sikhote Alin) are subdivided into three groups according to their oxygen isotope composition: group I with δ18O from +5.5 to +6.5‰, group II with δ18O from +7.6 to +10.2‰, and group III with less than +4.5‰. Group I rocks are similar in oxygen isotope composition to that of oceanic basalts and can be derived by melting of basaltic crust. Group II (rocks of the Tatibin Series) have higher δ18O, which suggests that their parental melts were contaminated by sedimentary material. The low 18O composition of group III rocks can be explained by their derivation from 18O-depleted rocks or by subsolidus isotopic exchange with low-18O fluid or meteoric waters. The relatively low δ18O and 87Sr/86Sr in the granitoids of Primorye suggest their derivation from rocks with a short-lived crustal history and can result from the following: (1) melting of sedimentary rocks enriched in young volcanic material that was accumulated in the trench along the transform continental margin (granites of the Tatibin Series) and (2) melting of a mixture of abyssal sediments, ocean floor basalts, and upper mantle in the lithospheric plate that subsided beneath the continent in the subduction zone (granites of the ESAVB). 相似文献
3.
Doklady Earth Sciences - 相似文献
4.
Ya.P. Malovitskiy E.M. Emelyanov O.V. Kazakov V.N. Moskalenko G.V. Osipov K.M. Shimkus I.S. Chumakov 《Marine Geology》1975,18(5):231-261
According to geophysical data, the Mediterranean Sea depressions are noted for a peculiar type of the earth's crust. The sedimentary rock sequence is of great thickness (8–15 km) and is of platform-type dislocation. Several structural stages are distinguished in the sedimentary complex. The youngest of them are the Messinian (evaporite) and Pliocene—Quaternary stages. The consolidated part of the earth's crust shows small thickness and is divided into large blocks. Vertical dislocations of the large crustal blocks which were conditioned by condensation—rarefaction and the upper mantle substance migration were at the base of Mediterranean sea floor transformation. 相似文献
5.
A. G. Zatsepin A. G. Ostrovskii V. V. Kremenetskiy V. B. Piotukh S. B. Kuklev L. V. Moskalenko O. I. Podymov V. I. Baranov A. O. Korzh S. V. Stanichny 《Izvestiya Atmospheric and Oceanic Physics》2013,49(6):659-673
Field studies performed at the Shirshov Institute of Oceanology, Russian Academy of Sciences (SIO RAS), Black Sea hydrophysical polygon in 2012 are illustrated. The variations in the vertical distribution of the hydrophysical characteristics (water temperature, salinity, and density, as well as current velocity) in the upper 200-m layer of the Black Sea above the continental slope in the cold season, obtained using an Aqualog autonomous profiler on a moored buoy station, have been analyzed. It has been established that the position of the permanent pycno-halocline and the hydrosulphuric zone upper boundary intensively oscillate with a characteristic period of 5–10 days. These oscillations cause short-period variations in the thickness of the oxigenated layer by 20–40 m, which reaches one-third of the total thickness of the layer. Measurements performed with autonomous stations (bottom ADCP, thermochain) at the experimental subsatellite polygon in the Gelendzhik coastal zone, as well as meteorological, ship, and satellite data obtained during the catastrophic rains and flooding on July 6–7, 2012, and afterward, have been simultaneously analyzed. It has been established that a catastrophic flow of turbid fresh water into the sea caused the formation of a belt of freshened (by 1.0–2.7 psu) less dense water with a high suspension concentration on the shelf and the upper continental slope. This water formed a quasi-geostrophic northwestward along-shore current, the velocity of which reached 40–50 cm/s. Therefore, the freshened and turbid water mostly escaped from the Gelendzhik region northwestward for two days after the flood, and the remaining water became free of suspension owing to its settlement during approximately the same period. The fields of the current velocity and suspension concentration in a submesoscale cyclonic eddy, identified on the satellite image, were measured at the hydrophysical polygon. It has been established that a high (when compared to the background values) suspension concentration in the surface-water layer in an eddy is related to intense upwelling at the eddy center and the rising of suspension (apparently phytoplankton) from the thermocline layer, where the suspension concentration is maximal. 相似文献
6.
New geological, petrochemical, mineralogical, and geochemical data are presented on the Uspensky granitoid massif in Southern
Primorye. The massif consists of the rocks of two associations: (1) the early association (103.3 ± 2.4 Ma) consisting of garnet-bearing
biotite and two-mica granite-leucogranites and (2) the late association (99 ± 2 Ma) represented by biotite (±amphibole) granodiorites,
melanogranites, and granites. The granitoids of both associations have moderate potassic alkalinity and elevated alumina contents
but differ in the proportions of alumina, calcium, and alkalis. The garnet-bearing granite-leucogranites are characterized
by the highest Rb, Th, and U contents and the lowest Sr, Ba, Hf, and Zr contents. The REE distribution patterns have a quasi-symmetric
shape and deep Eu minimums. The melanogranites show higher Sr and Ba contents and, as granites, are characterized by asymmetric
REE spectrums with an insignificant negative Eu anomaly. The porphyraceous granodiorites and granites are peculiar in their
lowered Sr and Ba contents, while the granodiorites have lowered contents of K, REE, Zr, Hf, Th, and U; elevated Nb contents;
and a distinctive Eu minimum. 相似文献
7.
R. A. Oktyabr’skii N. V. Vladykin A. M. Lennikov A. A. Vrzhosek T. A. Yasnygina S. V. Rasskazov E. Yu. Moskalenko T. A. Velivetskaya 《Geochemistry International》2010,48(8):778-791
New geochemical data are discussed on the magmatic complexes of the Koksharovka alkaline ultrabasic massif of Late Jurassic
age obtained by the ICP-MS method. Based on the first results on rare earth geochemistry of carbonatites and associating pyroxenites
and geological observations, the magmatic origin of the Koksharovka carbonatites was substantiated, and the problems of formation
of accompanying igneous rocks were considered. 相似文献
8.
9.
V. N. Moskalenko I. O. Murdmaa V. I. Artemenko N. V. Esin O. V. Levchenko E. V. Platonova 《Lithology and Mineral Resources》2006,41(2):187-194
New results of geomorphological, seismoacoustic, and lithological investigations on the upper continental slope off the Arkhipo-Osipovka Settlement are presented. Here, a large submarine slump was discovered by seismic survey in 1998. The assumed slump body, up to 200 m thick, rises 50–60 m above the valley floor that cuts the slope. Recent semiliquid mud that overlies laminated slope sediments with possible slump deformations flows down in the valley thalweg. Radiocarbon age inversion recorded in a Holocene sediment section of shelf facies recovered from the upper slope points to the gravity dislocation of sediments. 相似文献
10.
We have developed a model which aims to reproduce observational data of many kinds related to cosmic-ray (CR) origin and propagation:
direct measurements of nuclei, antiprotons, electrons and positrons,γ-rays, and synchrotron radiation. Our main results include
evaluation of diffusion/convection and reacceleration models, estimates of the halo size, calculations of the interstellar
positron and antiproton spectra, evaluation of alternative hypotheses of nucleon and electron interstellar spectra, and computation
of the Galactic diffuseγ-ray emission. Recently our CR propagation code has been generalized to include fragmentation networks
of arbitrary complexity. The code can now provide an alternative to leaky-box calculations for full isotopic abundance calculations
and has the advantage of including the spatial dimension which is essential for radioactive nuclei. Preliminary predictions
for sub-Fe/Fe, 10Be/9Be and 26Al/27Al are presented in anticipation of new experimental isotopic data. We show that combining information from classical CR studies
with γ-ray and other data leads to tighter constraints on CR origin and propagation.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献