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11.
Data on mineral-hosted melt, fluid, and crystalline inclusions were used to study the composition and evolution of melts that produced rocks of Changbaishan Tianchi volcano, China–North Korea, and estimate their crystallization parameters. The melts crystallized within broad ranges of temperature (1220–700°C) and pressure (3100–1000 bar), at a drastic change in the redox potential: Δ log \(f_{O_2}\) from NNO + 0.92 to +1.42 for the basalt melts, NNO –1.61 to –2.09 for the trachybasaltic andesite melts, NNO –2.63 to –1.89 for the comendite melts, and NNO –1.55 to –3.15 for the pantellerite melts. The paper reports estimates of the compositions of melts that produced the continuous rock series from trachybasalt to comendite and pantellerite. In terms of trace-element concentrations, all of the mafic melts are comparable with OIB magmas. The silicic melts are strongly enriched in trace elements and REE. The most strongly enriched melts contain concentrations of certain elements almost as high as in ores of these elements. The paper reports data on H2O concentrations in melts of different composition. It is demonstrated that the variations in the H2O concentrations were controlled by magma degassing. Data are reported on the Sr and Nd composition of the rocks. The deviations in the Sr isotopic composition are proportional to the 87Sr/86Sr ratio and could be produced in a melt with a high enough 87Sr/86Sr ratio during a geologically fairly brief time period. The evolution of melts that produced rocks of the volcano was controlled by crystallization differentiation of the parental basalt magmas at insignificant involvement of melt mixing and liquid immiscibility of silicate and sulfide melts. The alkaline salic rocks were generated in shallow-sitting (13–3.5 km) magmatic chambers in which the melts underwent profound differentiation that gave rise to pantellerites and comendites strongly enriched in trace elements (Th, Nb, Ta, Zr, and REE). Data on the composition of the magmas and parameters of their derivation are used to develop a generalized petrologic–geodynamic model for the origin of Changbaishan Tianchi volcano. 相似文献
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Z. V. Andreeva 《Russian Meteorology and Hydrology》2013,38(2):113-118
Considered are the possibilities for detecting the zones of ecological problems of marine environment using the ocean color sensors data and the radar images. Presented are the peculiarities of satellite data interpretation and the experimental results indicating the spatial and temporal distribution of biogenic slicks and chlorophyll-a concentration as the indicators of ecological conditions in the marine environment. Proposed is the multiparameter correlation graph displaying the relationship between the ecological factors significant for studying the anthropogenic eutrophication. 相似文献
14.
Water Resources - English-language publications on the assessment of hazards and risks in recreation water use are reviewed. The main themes and results of foreign studies into the effect of... 相似文献
15.
Presented are the results from experimental investigations into the influence of large tributaries (the Zeya, Bureya and Sungari rivers) on the water quality formation in the Amur river during the transformation of organic matter in bottom sediments. A spectral method and biochemical indication were used to show that toxic heavy metals (mercury, lead, and cadmium) accumulate in river sections of sedimentation of suspended load forming along the right bank from the mouth of the Sungari river to the city of Komsomolsk-on-Amur, and to substantiate the risk of emergence of hydrogen sulfide zones on the lower Amur. 相似文献
16.
E. S. Andreeva B. A. Anoshin V. E. Kunitsyn E. A. Leont’eva 《Geomagnetism and Aeronomy》2011,51(6):783-793
The outputs of the IRI-2001 and NeQuick ionospheric models are compared with radio tomographic (RT) images of the ionosphere
near the crest of the equatorial anomaly (EA) between Manila and Shanghai (about 850 cross sections overall). The values of
the slant total electron content measured in an RT experiment as opposed to the corresponding values derived from the IRI-2001
and NeQuick models are analyzed. A comparison of model cross sections and ionosonde measurements revealed discrepancies in
the critical frequencies of the ionospheric F2 layer, which were the strongest in the region of high spatial gradients close to the crest of the EA. The specific features
of the dynamics of the EA are discussed based on the results of the models and radio tomography. Our analysis has shown that
the IRI-2001 and NeQuick models mainly reproduce the “plasma fountain effect” but are incapable of recognizing the stable
structural features of the EA observed on RT reconstructions, for example, the daytime orientation of the mature core of the
EA parallel to geomagnetic field lines. A method to correct the IRI-2001 and NeQuick models in the vicinity of the EA crest
is suggested. 相似文献
17.
Karaev V. Yu. Panfilova M. A. Titchenko Yu. A. Meshkov E. M. Balandina G. N. Andreeva Z. V. 《Izvestiya Atmospheric and Oceanic Physics》2017,53(9):1050-1059
Izvestiya, Atmospheric and Oceanic Physics - The launch of the Dual-frequency Precipitation Radar (DPR) opens up new opportunities for studying and monitoring the land and inland waters. It is the... 相似文献
18.
L.A. Andreeva I.S. Ivchenko G.P. Milinevsky V.A. Rozhansky Yu.Ya. Ruzhin V.S. Skomarovskyi L.D. Tsendin 《Planetary and Space Science》1984,32(8):1045-1052
Data on the evolution of the density profiles of the neutral and ionized components of barium clouds obtained in “Spolokh” experiments are presented. The ion density in the cigar-like structure exceeds by more than an order of magnitude that of the background plasma, while the density in the plasma tail out flowing from the cigar-like structure is of the same order as that of the background plasma. The Ba+ outflow rate is determined. The results agree with observed cloud motion and with the estimates following from Dzubenko et al. (1983). 相似文献
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The space and time dynamics of organic matter concentration in groundwater in the Tungusskoe deposit during the historical 2013 flood in the Amur River is discussed. For comparison analysis, several methods for determining the quantitative characteristics of organic matter (spectrophotometry, gas-chromatographic mass spectrometry, and high-performance liquid chromatography) were applied to different layers of an aquifer at different distances from the shore line. The genesis of many organic substances is due to the inflow of river filtrate and surface water from the inundated floodplain. In the post-flood 2014, groundwater showed a decrease in the total amount of organic components and the presence of low-molecular hydrocarbons, diphenylamine, cosanes, phenanthrene, naphthalene, and derivatives of stearic and palmitic acids. Toxic methyl benzene was identified in most wells. 相似文献