-
Article
Diamonds of the Pionerskaya Pipe: Morphology, Spectroscopy, and Prospects
Compared to diamonds from the Arkhangelskaya and Karpinsky-1 pipes, diamonds from the Pionerskaya pipe formed at higher temperatures and were exposed to such conditions for a longer time (the underwent high-te...
-
Article
Sodalite: Spectroscopic and Thermochemical Investigations
Two sodalite samples (sample I is Na8Al6Si6O24Cl2⋅0.4H2O from the Kovdor alkaline ultramafic massif with carbonatites in the Murmansk region, Russia, and sample II is Na8Al6Si6O24Cl2⋅0.2H2O from the Bayan Kol nep...
-
Article
Enthalpy of Formation of Brazilianite: Calorimetric Data
Brazilianite Na0.91Al3.03(PO4)1.98(OH)4.06 (Galilea, Minas Gerais, Brazil) has been studied by thermal and electron microprobe analysis, powder X-ray diffraction, IR, Raman, and EPR spectroscopy. The EPR method h...
-
Article
Diamonds from the Ebelyakh Placer (Anabar, Yakutia): New Data on the Division by Primary Sources
Based on the morphological, luminescent, infrared (IR), and electron paramagnetic resonance (EPR) data for representative collection of diamonds from the Ebelyakh placer, a scheme for dividing crystals into th...
-
Article
Diamonds of the Udachnaya Pipe: Changes in Characteristics with Depth and Post-Mantle Evolution
The systematic changes of a complex of characteristics of diamonds from the Udachnaya pipe with depth was studied: the habit of crystals, their surface morphology, color, presence of inclusions, and spectrosco...
-
Article
The Elbrus Volcanic Center: New Features of EPR Dating of Rocks
Abstract—The restoration of the evolution of the Elbrus Volcanic Center (EVC) is of great importance for predicting possible eruptions. Some stages of its development occur in a time interval that is difficult to...
-
Article
The Morphologies, Defects, and Impurities of Diamonds in the Zapolyarnaya Pipe
A representative collection of Zapolyarnaya pipe diamonds of the first commercial production batch has been studied by the IR, PL, and EPR morphological analysis methods. The medium–low-N diamonds are the most...
-
Article
The Siratur Gold Deposit in Carbonaceous Rocks of an Ophiolite Association, South Urals
The Siratur gold deposit occurs in the northern part of the South Uralian segment of the Main Uralian Fault. The ore zone of the deposit is confined to an area of a tectonic junction of serpentinites of the Nu...
-
Article
Annealing Kinetics of Ti- and Ge-Related Centers in Quartz
Radiation defects in quartz are widely used in trapped charge chronometry. Analytical function which simulates dose–response curve is a very important for the correct measurement of equivalent dose. Ge- and Ti...
-
Article
The Effect of Aggregation of Impurity Nitrogen on Diamond X-Ray Luminescence
Two samplings of 65 diamond crystals divided by the intensity of a slow X-ray luminescence component are studied from the Arkhangel’skaya and Karpinskogo-1 pipes. IR and EPR spectroscopies revealed a relations...
-
Article
The crystallization temperature of vein quartz estimated from the concentration of the titanium paramagnetic center in quartz: A case study of the Peschanka porphyry copper–molybdenum–gold deposit, Western Chukchi Peninsula, Russia
The concentration of the Al and Ti paramagnetic impurity centers in pre-ore and ore-stage quartz at the Peschanka porphyry copper–molybdenum–gold deposit in the Western Chukchi Peninsula, Russia were determine...
-
Article
Study of structural and valence state of Cr and Fe in chrysoberyl and alexandrite with EPR and Mössbauer spectroscopy
Data on the structural and valence distribution of Cr and Fe in chrysoberyl and in alexandrite, its gem variety, are given. It is shown that the Cr3+ line in the natural Ural and Tanzania samples is the strongest...
-
Article
The formation and recombination kinetics of [Si 4 5− ] centers in zircon
The radiation sensitivity, time stability and optical sensitivity of [Si 4 5− ] paramagnetic centers in natural zircon crystals, particularly those from the Lat...
-
Article
Various Recombination Kinetics of Al Centers in Quartz from the Elbrus Volcano and the Eldzhurtinsky Granite Rocks
Recombination of paramagnetic [AlO4 −/h+] centers in quartz from the Elbrus volcanic rocks and the Eldzhurtinsky intrusive rocks has been studied. Laboratory annealing experiments have sho...
-
Article
EPR dating and evolution of the Elbrus volcano
This study is devoted to the reconstruction of the Elbrus volcano evolution by electron paramagnetic resonance (EPR) dating. The following ages have been obtained for the Elbrus activity cycles: early caldera ...
