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A. A. Tatarinov L. I. Yalovik T. G. Shumilova S. V. Kanakin 《Doklady Earth Sciences》2016,469(1):686-689
Active participation of gas–oil fluids in the processes of mineral formation and petrogenesis in travertines of the Arshan and Garga hot springs is substantiated. The parageneses of the products of pyrolytic decomposition and oxidation of the gas–oil components of hydrothermal fluids (amorphous bitumen, graphite-like CM, and graphite) with different genetic groups of minerals crystallized in a wide range of P–T conditions were established. Travertines of the Baikal rift zone were formed from multicomponent hydrous–gas–oil fluids by the following basic mechanisms of mineral formation: chemogenic, biogenic, cavitation, fluid pyrometamorphism, and pyrolysis. 相似文献
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Late Quaternary geyserite and travertine in Ol’khon Area and Ol’khon Island contain a recently discovered high-temperature association of hydrocarbon and carbonaceous phases, including highly crystalline graphite, α-carbyne, and bitumen, which were produced at temperatures no lower than 400°C. A carbon modification α-carbyne, which was previously found only among experimental products, was first identified in geyserite from the Ol’khon area. Nanometer-sized morphostructures and crystallites were detected on the surface of highly crystalline graphite from the geyserite and travertine. No such structures and crystallites have ever been found on graphite of magmatic, metamorphic, metasomatic, or pneumatolytic origin. The newly formed nanometer-sized morphostructures and crystallites should be regarded as typomorphic features of carbonaceous phases in high-temperature hydrothermal rocks. Graphite was likely produced in the geyserite and travertine by low-pressure polycondenssation of hydrocarbons, at free growth in open space from oversaturated solutions and/or a gas phase. 相似文献
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Here, the results of examination of black shale type rocks from the Urals for noble metal mineralization are presented for the first time: they have been obtained using atomic–absorption spectrometry along with data of a complex analysis of a carbon mineralization applying a complex of high-resolution techniques. The data acquired demonstrate anomalously high Au concentrations in all the rocks examined. The carbon matter occurs in a wide range of phase states, including nanocrystalline graphite, carbon nanofiber, nanoglobules, diamond-like carbon, and bitumens. The black shale type rocks were found to be promising for further studies in order to seek industrially valuable objects including in areas of the northern part of the Urals. 相似文献
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The existence of a new type of natural lonsdaleite confined to regionally metamorphosed and metasomatically modified rocks
is verified based on complex data obtained by high resolution microscopy and spectroscopy. The structural and spectroscopic
characteristics of isolated lonsdaleite particles that have a relatively large size and monocrystalline structure are given
for the first time. The results of these studies can be used not only for simulating the processes of natural diamond formation,
but also for designing superhard materials with allowance for the fact that lonsdaleite is the hardest material on Earth. 相似文献
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L. M. Pavlova V. I. Radomskaya L. P. Shumilova A. M. Ionov V. V. Ivanov A. V. Poselyuzhnaya 《Geochemistry International》2018,56(5):450-461
Based on scanning electron microscopy, infrared spectroscopy, and X-ray photoelectron spectroscopy, it was shown that platinum sorption by the biomass of microscopic fungi occurs in several stages. Incipient interaction involves physical and chemical sorption and is followed by the reduction of adsorbed platinum ions to a zero-valence state at the expense of metabolic products of microorganisms and eventual aggregation of zero-valence particles to nanometer-sized forms. Model experiments revealed a high platinum sorption potential of the physiologically active biomass of microscopic fungi and their cell envelopes (chitin). 相似文献
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Pavlova L. M. Shumilova L. P. Radomskaya V. I. Sorokin A. P. Ivanov V. V. 《Doklady Earth Sciences》2019,488(2):1178-1181
Doklady Earth Sciences - Data on the species and strain specificity of micromycetes in the processes of toxic elements extraction from multicomponent solutions are obtained as results of modal... 相似文献