scholarly journals Experimental Modeling of Silicate and Carbonate Sulfidation under Lithospheric Mantle P,T-Parameters

Minerals ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 425
Author(s):  
Zdrokov ◽  
Novoselov ◽  
Bataleva ◽  
Borzdov ◽  
Palyanov
Keyword(s):  
Spectral Characteristics ◽  
Diamond Growth ◽  
Crustal Material ◽  
Metasomatic Alteration ◽  
Zonal Structure ◽  
Mantle Silicates ◽  
Redox Interaction ◽  
Raman Spectral ◽  
Dissolved Components ◽  
Extraction Of Metals

: Interactions of mantle silicates with subducted carbonates, sulfides, and sulfur-rich fluids are experimentally simulated in the olivine-ankerite-sulfur and olivine-ankerite-pyrite systems using a multi-anvil high-pressure split-sphere apparatus at 6.3 GPa and range of 1050–1550 °C. Recrystallization of Fe,Ni-bearing olivine and ankerite in a sulfur melt was found to be accompanied by sulfidation of olivine and carbonate, involving partial extraction of metals, carbon, and oxygen into the melt, followed by the formation of pyrite (±pyrrhotite), diopside, and Fe-free carbonates. The main features of metasomatic alteration of Fe,Ni-olivine by a reduced sulfur fluid include: (i) a zonal structure of crystals (Fe-rich core, Mg-rich rim); (ii) inclusions of pyrite and pyrrhotite in olivine; (iii) certain Raman spectral characteristics of olivine. At T > 1350 °C, two immiscible melts, a predominantly sulfur melt with dissolved components (or a Fe–Ni–S–O melt) and a predominantly carbonate one, are generated. The redox interaction of these melts leads to the formation of metastable graphite (1350–1550 °C) and diamond growth (1550 °C). The studied olivine-ankerite-sulfur and olivine-ankerite-pyrite interactions may be considered as the basis for simulation of metasomatic processes accompanied by the formation of mantle sulfides during subduction of crustal material to the silicate mantle.

scholarly journals Raman Spectral Characteristics of Bis(terdentate)cobalt(III) Complexes with N and O Donor Atoms

1988 ◽  
Vol 61 (3) ◽  
pp. 841-848 ◽  
Author(s):  
Tatsuya Kawamoto ◽  
Takaji Yasui ◽  
Hisahiko Einaga ◽  
Jinsai Hidaka
Keyword(s):  
Spectral Characteristics ◽  
Raman Spectral

Spatial scattering Raman spectral characteristics of Clenbuterol

2021 ◽  
Author(s):  
Qinghui Guo ◽  
Yankun Peng ◽  
Yongyu Li ◽  
Kuanglin Chao ◽  
Feifei Tao
Keyword(s):  
Spectral Characteristics ◽  
Raman Spectral

Research on Raman Spectral Characteristics and Mechanism of Ammonium Sulfate Solution

2014 ◽  
Vol 34 (3) ◽  
pp. 0330004
Author(s):  
孙松 Sun Song ◽  
蔡廷栋 Cai Tingdong ◽  
刘莹 Liu Ying ◽  
王静静 Wang Jingjing ◽  
叶勇 Ye Yong ◽  
...  
Keyword(s):  
Ammonium Sulfate ◽  
Spectral Characteristics ◽  
Sulfate Solution ◽  
Ammonium Sulfate Solution ◽  
Raman Spectral

A spectroscopic study of the solvent dependent processes of the anils of benzaldehyde and salicylaldehyde

1982 ◽  
Vol 60 (13) ◽  
pp. 1727-1737 ◽  
Author(s):  
Jerry W. Lewis ◽  
Camille Sandorfy
Keyword(s):  
Hydrogen Bond ◽  
Ground State ◽  
Spectral Characteristics ◽  
Infrared And Raman Spectra ◽  
Absorption Data ◽  
Absorption Bands ◽  
Visible Absorption ◽  
Raman Spectral ◽  
Dependent Processes ◽  
Electronic Ground

The ultraviolet–visible, infrared, and Raman spectral characteristics of some anils of benzaldehyde and salicylaldehyde in several solvents have been investigated. The ultraviolet–visible absorption data indicate that in solvents with a proton donating ability less than or equal to trifluoroethanol a single equilibrium exists in solutions of N-(2-hydroxybenzylidene)aniline, whereas in solvents with a proton donating ability equal to or greater than hexafluoroisopropanol more than one equilibrium occurs. The infrared spectra of this compound dissolved in trifluoroethanol do not show new absorption bands in the 1700–1500 cm−1 region; however, new absorption bands in this region do appear when hexafluoroisopropanol is employed as solvent. From these data it is inferred that the first equilibrium involves the breaking of the chelate hydrogen bond and the second equilibrium involves actual protonation of N-(2-hydroxybenzylidene)aniline in the electronic ground state. A comparison of the infrared and Raman spectra of the title compounds is also made and alternate assignments for several observed bands in the 1700–1500 cm−1 region are proposed.

scholarly journals Raman Spectroscopic Study of Coal Samples during Heating

2019 ◽  
Vol 9 (21) ◽  
pp. 4699 ◽  
Author(s):  
Yingfang Xie ◽  
Jinglin You ◽  
Liming Lu ◽  
Min Wang ◽  
Jian Wang
Keyword(s):  
High Temperature ◽  
Spectroscopic Study ◽  
Spectral Characteristics ◽  
Blue Shift ◽  
Carbonaceous Materials ◽  
Temperature Dependent ◽  
Spectral Parameters ◽  
Raman Spectroscopic ◽  
Raman Spectroscopic Study ◽  
Raman Spectral

Raman spectroscopy can be used to record the characteristic spectra of carbonaceous materials. The D and G bands are the most popular and most important spectral characteristics when discussing carbonaceous materials. In this paper, a Raman spectroscopic study of different coals was first carried out using a 355 nm wavelength laser beam as an excitation source. The spectral parameters of the resultant spectra were evaluated and analyzed. Raman spectral characteristics of different kinds of coals were explored. The high temperature-dependent Raman spectra of the coals were further collected in a temperature range from 298 to 1473 K in order to investigate the transformations of the internal structure of the coals during the pyrolysis process. An abnormal blue shift of the G band occurred at moderate temperature (600–900 K), and the intensity of the G band became weaker at high temperatures, indicating pyrolysis and graphitization of the sample at moderate and high temperature, respectively.

Relationships between quality of coals, resulting cokes, and micro-Raman spectral characteristics of these cokes

2015 ◽  
Vol 144-145 ◽  
pp. 130-137 ◽  
Author(s):  
Rafał Morga ◽  
Iwona Jelonek ◽  
Krystyna Kruszewska ◽  
Wojciech Szulik
Keyword(s):  
Spectral Characteristics ◽  
Raman Spectral
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