scholarly journals The oxidation - reduction characteristics of Ngoc Tu granitoid block and their specialized chemistry of geochemistry

2021 ◽  
Vol 62 (1) ◽  
pp. 53-63
Author(s):  
Nguyen Duc Do ◽  
Niem Van Nguyen ◽  
Thanh Hung Pham ◽  
Hieu Cong Duong ◽  
Tan Trong Bui ◽  
...  
Keyword(s):  
Redox Conditions ◽  
Geochemical Behavior ◽  
Oxidation Reduction ◽  
Reduction Characteristics

Oxidation-reductionstate of magma in general and granitoid in particular is important for determining themetallogenetic potential of magma bodies. Redox conditions help to interpret the specialized chemistry of geochemistry not only at the content level, but also on the geochemical behavior of the elements. The research on primary inclusions of magma by hermobarogeochemical method of RAMAN equipment has identified that Ngoc Tu granitoid block is in the oxidized state indicated by CO2-rich primary inclusions. This condition shows that the Ngoc Tu granitoidblock is not favorable for the metalogical potential of Sn, but it can be advantageous for the movements of Mo, W from magmatic solution into ore solution.

Oxidation-reduction characteristics of octahydrochalcogenoxanthenes and octahydroxanthylium cations

1991 ◽  
Vol 27 (1) ◽  
pp. 38-41 ◽  
Author(s):  
N. T. Berberova ◽  
A. F. Blinokhvatov ◽  
A. S. Archegova ◽  
E. S. Klimov ◽  
A. E. Shpakov ◽  
...  
Keyword(s):  
Oxidation Reduction ◽  
Reduction Characteristics

Investigation of the Oxidation-Reduction Characteristics of Heterocyclic Quinones

2004 ◽  
Vol 40 (2) ◽  
pp. 161-165 ◽  
Author(s):  
E. Yu. Khmel'nitskaya ◽  
N. B. Grigoriev ◽  
V. M. Lyubchanskaya ◽  
T. I. Mukhanova ◽  
V. G. Granik
Keyword(s):  
Oxidation Reduction ◽  
Reduction Characteristics

scholarly journals Structures and Stabilities of Trivalent and Tetravalent Rare Earth Ions in Sevenfold Andeightfold Coordination in Fluorite-Related Complex Oxides

1991 ◽  
Vol 257 ◽  
Author(s):  
Lester R. Morss
Keyword(s):  
Powder Diffraction ◽  
Rare Earth Ions ◽  
Lanthanide Ions ◽  
Two Phase ◽  
Reduction Potentials ◽  
Oxidation Reduction ◽  
Ionic Size ◽  
Phase Mixture ◽  
Reduction Stability ◽  
Reduction Characteristics

ABSTRACTThis paper reports the preparation and characterization of a series of oxides containing3+ or 4+ lanthanide (M = Ce, Pr, or Tb) ions, with different ionic sizes and varying M4+/M3+ reduction potentials, in nearly cubic coordination. The objective of the study was to demonstrate how oxidation-reduction characteristics and ionic-size trends explain the properties of these oxides and to compare the oxidation-reduction stability of M3+ and M4+ lanthanide ions in high (CN 7 or 8) coordination in fluorite-related oxides versus low (CN 6) coordination in perovskite oxies. Efficient preparative methods are reported, as well as powder diffraction and thermogravimetric measurements for oxides CaMTi2O7-x and CaMZr2O7-x. These oxides were characterized by X-ray powder diffraction and by thermogravimetric analysis. CaCeTi2O7 is a pyrochlore, a = 10.142(4) Å with Ce4+ much more easily reducible than in the perovskite BaCeO3. By contrast, a preparation with the stoichiometry “CaPrTi2O7-x” is a two-phase mixture of perovskite CaTiO3 and a presumably Pr3+-rich pyrochlore Pr2Ti2O7(?). CaTbTi2O7-x appears to be a Tb3+ pyrochlore, a = 10.149(2) Å. CaCeZr2O7 is a pyrochlore, a = 10.524(1) sÅ. A preparation of “CaPrZr2O7-x” also appeared to yield a two-phase mixture, perovskite CaZrO3 and pyrochlore Pr2Zr2O7. In this paper, the structures, f-element ion sites, and M(IV)- MM1I stability trends in the CaMTi2O7-x and CaMZr2O7-x oxides are compared with the structural and stability trends in the perovskites BaMO3 which have M4+ ions in sixfold (tilted octahedra) coordination.

scholarly journals GRANITOID MASSIVES OF THE TRANSITION ZONE OF OXIDATION-REDUCTION CONDITIONS (SIKHOTE-ALIN OROGENIC BELT)

2021 ◽  
Vol 24 (2-3) ◽  
pp. 60-63
Author(s):  
E.A. Konovalova ◽  
L.F. Mishin ◽  
Yu.V. Taltykin
Keyword(s):  
Magnetic Susceptibility ◽  
Mineral Composition ◽  
Igneous Rocks ◽  
Redox Conditions ◽  
Magnetic Fraction ◽  
Sikhote Alin ◽  
Detailed Data ◽  
Variable Valence ◽  
Oxidation Reduction ◽  
First Time

Redox conditions for the formation of igneous rocks determine the valence of variable valence elements. The ore mineral composition and amount, the magnetic fraction weight and the magnetic susceptibility of the rock and the composition of the dark-colored minerals depend on the ratio of Fe3+ and Fe2+. It is for the first time for more than 50 years of the redox conditions study that the he authors obtained detailed data on granitoid massifs located in the zone of redox conditions transition.

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