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Yakovenchuk V. N. Pakhomovsky Y. A. Konopleva N. G. Panikorovskii T. L. Bazai A. V. Mikhailova J. A. Bocharov V. N. Krivovichev S. V. 《Doklady Earth Sciences》2022,505(2):549-552
Doklady Earth Sciences - Sergeysmirnovite, MgZn2(PO4)2 · 4H2O, is a new mineral from the oxidation zone of the Kester mineral deposit, Sakha-Yakutia, Russia. This mineral forms... 相似文献
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Guotao Zhang Peng Cui Yanzhou Yin Dingzhu Liu Wen Jin Hao Wang Yan Yan Bazai Nazir Ahmed Jiao Wang 《水文研究》2019,33(25):3195-3212
Synchronously and accurately estimating the flood discharges and dynamic changes in the fluid density is essential for hydraulic analysis and forecasting of flash floods, as well as for risk assessment. However, such information is rare for steep mountain catchments, especially in regions that are hotspots for earthquakes. Therefore, six hydrological monitoring sites were established in the main stream and tributaries of the 78.3‐km2 Longxi River catchment, an affected region of the Wenchuan earthquake region in China. Direct real‐time monitoring equipment was installed to measure the flow depths, velocities, and fluid total pressures of the flood hydrographs. On the basis of field measurements, real‐time mean cross‐sectional velocities during the flood hydrographs could be derived from easily obtainable parameters: cross‐sectional maximum velocities and the calibrated dimensionless parameter Kh . Real‐time discharges were determined on the basis of a noncontact method to establish the effective rating curves of this mountainous stream, ranging from 1.46 to 386.34 m3/s with the root mean square errors of ≤10.22 m3/s. Compared with the traditional point‐velocity method and empirical Manning's formula, the proposed noncontact method was reliable and safe for monitoring whole flood hydrographs. Additionally, the real‐time fluid density during the flood hydrographs was calculated on the basis of the direct monitoring parameters for fluid total pressures and water depths. During the flood hydrograph, transient flow behaviour with higher fluid density generally occurred downstream during the flood peak periods when the flow was in the supercritical flow regime. The observed behaviour greatly increased the threat of damage to infrastructure and human life near the river. Thus, it is important to accurately estimate flood discharge and identify for fluid densities so that people at risk from an impending flash flood are given reliable, advanced warning. 相似文献
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The paper presents data on the mineral assemblages and chemical composition of minerals in rocks from the eastern part of the Pana Massif, Kola Peninsula, and the results obtained by studying the amphibolization of rocks of this massif genetically related to metamorphism. The rocks contain four amphibole populations, which can be used as good indicators for metamorphic facies. The amphiboles show broad compositional variability. Their evaluated P-T crystallization conditions indicate that the prograde stage of the overprinted metamorphic processes occurred at temperatures increasing from 382 to 473°C and pressures from 1.7 to 4.3 kbar. The retrograde stage (biotitization, chloritization, silification, and carbonatization) took place at temperatures of about 370°C and pressures of approximately 1 kbar. The fluid regime of the metamorphic transforms was also controlled by the temperature: the fluids were oxidizing early in the course of the process and gradually became more reducing with decreasing temperature. 相似文献
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Yakovenchuk Victor N. Pakhomovsky Yakov A. Konopleva Nataliya G. Panikorovskii Taras L. Bazai Ayya Mikhailova Julia A. Bocharov Vladimir N. Ivanyuk Gregory Yu. Krivovichev Sergey V. 《Mineralogy and Petrology》2018,112(4):591-601
Mineralogy and Petrology - Batagayite, CaZn2(Zn,Cu)6(PO4)4(PO3OH)3·12H2O, is a new secondary phosphate mineral from the Këster deposit, Arga-Ynnykh-Khai massif, NE Yakutia, Russia. It is... 相似文献
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Geology of Ore Deposits - The PGE-bearing Vurechuaivench massif is part of the Paleoproterozoic Monchegorsk Complex, composed of layered rock series: gabbronorite, anorthosite, and norite.... 相似文献
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Geology of Ore Deposits - Many massive sulfide ore occurrences and deposits in the Kola region are located within the Paleoproterozoic Pechenga–Imandra–Varzuga rift belt (2.5–1.7... 相似文献
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A. V. Bazai G. Yu. Ivanyuk Ya. A. Pakhomovsky P. M. Goryainov V. N. Yakovenchuk 《Geology of Ore Deposits》2009,51(7):525-536
Eleven native minerals and intermetallic alloys were identified in rocks of the banded iron formation (BIF) in the Kola Peninsula:
copper, silver, gold, electrum, auricupride, cuproauride, tetraauricupride, bismuth, sulfur, tellurium, and graphite. Graphite
is a common mineral of sulfide-bearing BIF and gneiss. Sulfur occurs in supergene-altered sulfide-bearing BIFs together with
Fe- and Ca-sulfates. Gold of low fineness (electrum) in association with electrum, acanthite, auricupride, volynskite, hessite,
cervelleite, pavonite, petzite, and bismuth is related to the areas of hydrothermally altered skarnoids with greenalite, chamosite,
aegirine, and Na-Ca amphibole. Redeposited gold of high fineness associated with auricupride, hessite, silver, electrum, kostovite,
cuproauride, tetraauricupride, and sperrylite occurs in low-temperature zonal hydrothermal segregations hosted in aluminous
gneiss and which formed under the effect of alkalized, highly siliceous solutions at the regressive stage of BIF metamorphism. 相似文献
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