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[en] Present article is devoted to fluorite of deposits of the Northern Tajikistan. The results of thermo geochemical studies of fluorite from barite deposits have been considered. The mineralogical characteristics of fluorite as well as distribution of impurities in its composition is given.
[en] Micro-Raman spectroscopy was used to evaluate the radiation damage in metamict form of gadolinite and defects formed in halite single crystals. The metamict mineral of gadolinite was investigated in order to study its structural variation in metamict form and recrystallized form. However, types of defects which are originally present in halite crystals responsible for its gradual colour variation are identified using Micro-Raman spectra (author)
[en] On the bases of studying of crystal-morphology fluorite, gas-liquid inclusions and some trace element contents, the perspective estimation some of the fluorite deposits of Eastern Pamir is given
[en] SNL-9 (permitted by the State Engineer as C-2950) was drilled to provide geological data and hydrological testing of the Culebra Dolomite Member of the Permian Rustler Formation within a proposed re-entrant of the margin of halite dissolved from the upper part of the Salado near Livingston Ridge. SNL-9 is located in the southeast quarter of section 23, T22S, R30E, in eastern Eddy County, New Mexico. SNL-9 was drilled to a total depth of 845 ft below the ground surface. Below surface dune sand and the Berino soil, SNL-9 encountered, in order, the Mescalero caliche, Gatuna, Dewey Lake, Rustler, and uppermost Salado Formations. Two intervals were cored: (1) from the lower Forty-niner Member through the Magenta Dolomite and into the upper Tamarisk Member; and (2) from the lower Tamarisk Member through the Culebra Dolomite and Los Medanos Members and into the uppermost Salado Formation. Geophysical logs were acquired from the open hole to total depth, and the drillhole was successfully completed with a screened interval open across the Culebra.
[en] The kinetic parameters of the two high-temperature glow peaks (peaks III and IV) in a fluorite obtained in a region of Nigeria has been determined in detail by using Chen's peak shape and initial rise methods. The values of these parameters calculated with these two methods are comparable. The orders of kinetics of the two peaks are found to be different from either the first or the second. The b values obtained ranged from 1.023 to 1.134 for peak III and from 1.156 to 1.223 for peak IV. The E values ranged from 0.777 to 1.068 eV for peak III and from 1.328 to 1.428 eV for peak IV. The present values of kinetic parameters are compared with those from past studies on fluorite and the observed variations discussed. The electron lifetime in each of these traps, a parameter to dosimetry, was also determined. The value of lifetime obtained for peak III suggests that the peak may be a complex one, when it is viewed in relation to the thermoluminescence enhancement of this peak with storage time that has been reported. The two peaks were tested for quasi-equilibrium (QE) approximation because the general order model used assumed QE condition; it was found that for all the heating rates used peak IV was emitted under QE condition, while peak III was emitted under QE condition only at the smallest heating rates of 7 and 10 degree sign C/s used in this work