LUMINESCENCE OF ROCK-FORMING QUARTZ OF THE GRANITOIDS FROM THE KOLYVAN-TOMSK FOLDED BELT IN RELATION TO FACIES FEATURES OF MASSIF FORMATION.
The Permian-Triassic period of the Central Asia geological evolution draws particular attention due to the emergence of the Siberian superplume (Dobretsov, 1997). This study is aimed at resolving one of the most important issues of modern geology--defining the conditions of mineralization during granitoid intrusive bodies formation in the areas of island-arc collision and subcontinental terrains (Nebera et al., 2012). This research originates from earlier studies of the authors on the Mg-Fe micas composition (Nebera et al., 2012) and the luminescence of feldspars (Boroznovskaya et al., 2012). In this study, the authors aimed to show the informative value of the luminescent features of quartz, ubiquitous rockforming mineral, in the context of solving this problem.
STUDY SUBJECT BRIEF GEOLOGICAL DESCRIPTION
The Kolyvan-Tomsk folded belt (KTFB), where granitoids are studied, is located in the Extreme North-West of the Altai-Sayan folded region, being its youngest (Late Hercinian) region; it is a part of the Central West Siberian fold system. In the geodynamic plan, the KTFB corresponds to the back-arc basin. Beginning with the Devonian, the KTFB developed in the regime of an active continental margin. Within its boundaries are island arcs, the Novosibirsk trough and back-arc basins, which survived later accretion and collision. We are primarily interested in the Novosibirsk depression. The syncline is composed of flyschoid-shale-sandy-siltstone lower-Carbonaceous ([C.sub.1]t-v) and Upper Devonian (D3fm) sediments and is complicated by a number of small depressions made by carbonate-sedimentary rocks. Granitoid massifs of permo-Triassic age are confined to dome-shaped uplifts, the formation of which is associated with collision. The Ob, Novosibirsk, Kolyvan, and Barlak massifs represents the granitoid magmatism of the permo-Triassic age of the KTFB. These granitoids form a chain of arrays elongated according to the strike of the main structures (Fig. 1).
There is no clear idea of the evolutionary patterns of deep magma chambers and the features of magmatic differentiation of the whole granitoid complex. There is also no consensus on the genesis of granitoids from the Kolyvan-Tomsk folded belt. There are different estimates of their ore resources and cross-sectional profiles of separate massifs (Nuvar'eva, 1968; Sotnikov et al., 1999; Khomichev et al., 2003; Khomichev, 2007). Some researchers suggest that granitod magmatism should be considered as the result of natural magmatic differentiation of the parental basaltic magma (Khomichev, 2007). According to another point of view (Sotnikov et al., 1999), the Barlak, the Kolyvan massifs and, presumably, the northern part of the Novosibirsk massif (Mochishche stock) should be distinguished as a separate complex--the Barlak leucogranite (T2-3), characterized by rare metal mineralization (stannic-tungstic-beryllic with silver) (Fig. 1).
BRIEF PETROCHEMICAL AND GEOCHEMICAL CHARACTERISTICS OF GRANITOIDS OF THE KOLYVAN-TOMSK FOLDED BELT
Analysis of petrochemical characteristics of granitoids in the study area showed that the main feature is their increased alkalinity with increased potassium (Neber et al., 2012). The rocks are peraluminous, granitoids of a "mixed type", having the petrochemical features of S- and A-type granitoids. And there are granitoids of the Kolyvan and Barlak massifs in the A-type field. Although the rocks of the Ob and Novosibirsk massifs show the S-type granitoids features, they are closer to I-granites (more mafic, contain hornblende, accessory magnetite, orthite, high degree of oxidation of iron, are formed at high oxygen fugacity, high concentration of Ba, Sr, normal or high concentration of Ca). In addition, the Ob and Novosibirsk massifs granitoids have a number of geochemical characteristics that can be classified as latite type (Khomichov et al., 2003). They correspond to the subalkaline series at [K.sub.2]O > [Na.sub.2]O, are characterized by increased magnesia, high concentrations of Ni, Cr, Ba, Sr, low Rb and increased K/Rb ratios. Leucogranites of the Kolyvan and Barlak massifs are characterized by high concentration of Rb, concentrations of Ba and Sr decrease drastically, they are also enriched in Be, Cs. All this brings them closer to Li-F granites of increased alkalinity, according to the same classification. The degree of rare metal specialization increases from the Novosibirsk Massif to the Kolyvan Massif leucogranites.
STUDY METHODS, MATERIALS AND EQUIPMENT
LUMINESCENCE OF MINERALS AS A SOURCE OF GENETIC INFORMATION
Luminescence is a physical property of a mineral, which reflects its crystallochemical features, formation and transformation conditions. Luminescence intensity is related to the density of luminescence centers within the mineral, which, in turn, depends on the condition of the mineral formation, i.e. temperature, pressure, acid and redox conditions. Therefore, luminescence is a typomorphic characteristic, containing genetic information (Boroznovskaya et al., 2012). In the course of studying any geological object, it is important to define the rock-forming mineral, which luminescence will provide genetic information. Quartz is characterized by simple stoichiometry and structure. However, optical spectroscopy methods (including luminescent ones) allow revealing its complex structural and chemical states at the electronic level (Boroznovskaya et al., 2015; Boroznovskaya et al., 2016; Gotze et al., 2001; Kuznetsov and Tarashchan, 1988; Lyutoev, 2008; Pagel et al., 2000; Pagonis et al., 2007; Pogorelov et al., 1981; Votyakov et al., 1993). Microscopic structural imperfection of quartz manifests itself through the luminescence centers, being related to the parameters of its genesis (Demars et al., 1996; Rink et al., 1993; Rokachuk, 2006). Studying quartz luminescence by identifying specific features of fine atomic and electronic structure can provide genetic information.
BRIEF DESCRIPTION OF QUARTZ STRUCTURAL IMPERFECTIONS AND LUMINESCENCE CENTERS
The quartz luminescence spectra depend on presence and proportion of extrinsic and intrinsic mineral structure defects. The most common trace element in quartz is aluminium. Structural impurities caused by aluminium can be found in quartz crystals of any genesis, and their density, depending on the conditions of the mineral formation and metamorphism, if there have been such processes, according to certain studies, ranges from 2 to 500 ppm (Rakov and Moiseev, 1999). Trivalent aluminium forms tetrahedral bonds with three oxygen ions, leaving the bond with the fourth ion uncompensated. [Li.sup.+] or [Na.sup.+] cations, located within structural channels, may serve as charge compensators (Kuznetsov and Tarashchan, 1988; Gotze et al., 2001). Structural impurities caused by [Ge.sup.3+], [Fe.sup.3+], [Mn.sup.2+] etc. can also be found. The defects, which are not related to trace elements included into the quartz structure, are various. First of all, these include oxygen and silicon vacancies. Tetrahedric structures with a silicon vacancy contain centers of the [O.sup.-]-type--various defect electrons of the oxygen atoms (Gorobets and Rogozhin, 2001). Oxygen vacancies (so-called E-centers) are formed due to natural ionizing radiation. Naturally occurring quartz usually contains non-paramagnetic forms of these defects, which can be forced to the [E.sub.1] paramagnetic state through annealing (Jani et al., 1983). Nonbridging oxygen can also be formed within the quartz structure. Ideally, each oxygen atom within the silica structure is bridging, which means that it is connected with two silicium atoms. Nonbridging oxygen atom has bond with one silicium atom. A negatively charged hole center can also be associated with it. Quartz crystals of any genesis contain certain amounts of self-trapped excitons--structural imperfections, including an electron-hole pair, which is a Frenkel defect (an interstitial-vacancy pair, in this case consisting of an oxygen vacancy and a peroxide bridge). They are formed due to strong interactions of electrons and phonons in Si[O.sub.2] (Hayes, 1990). All these imperfections form the basis for the emergence of luminescence centers. We will refer to all luminescence centers based on intrinsic defects as excited states of oxygen O*.
According to the composition and quantity of dark-colored minerals, the KTFB granitoids are traditionally divided into two groups. These are biotite-amphibole, biotite granites, granodiorites (Ob, Novosibirsk massifs) and biotite, biotite-muscovite leucocratic granites (Kolyvan, Barlak massifs).
In the Ob massif rocks of several intrusive phases are distinguished in the structure of the massif (Bazhenov et al., 2003). The first phase is coarse-grained porphyritic biotite granites, amphibole-biotite granites, granosyenites, granodiorites. The second phase of injection time is close to the main phase and is represented by medium- and fine-grained leucocratic granites with rare potassium feldspar phenocrysts. The third (final) phase is low-power dikes, aplite veins, aplite-like granites. The main mass area is composed of the first phase rocks. The granitoids of the central part of the intrusion and the endocontact facies are distinguished. Endocontact facies were penetrated by Novobibeevsky quarry (Nb). Porphyritic structure is typical for all rocks due to large (up to 8-10 cm) orthoclase precipitates (Nebera and Boroznovskaya, 2009).
The Novosibirsk massif is composed of porphyritic biotite granites, granosyenites and biotite-containing leucogranites (Mochishche stock).
The Barlak and Kolyvan massifs granitoids are almost indistinguishable in petrographic characterristics. The main area of the massifs is mediumgrained biotite leucogranites. The endocontact facies are represented by biotite and two-mica granites.
SAMPLING AND PREPARATION OF SAMPLES FOR ANALYSIS
Quartz mono fractions from three intrusive phases of the Ob massif (44 samples, including endocontact), from biotite granites and granosyenites of the Novosibirsk Massif (20 samples) and leucogranites of the Kolyvan and Barlak massifs (20 samples), and from the leucogranites of the Mochishche stock (Novosibirsk massif) (10 samples) were selected for clarifying the influence of the formation conditions on the spectral composition of the emitted luminescence. Samples of quartz monofraction of 20 mg for XRL analysis and 20 mg for TL analysis were taken from rock crushed sample (0.2-0.5 mm fraction). The quartz grains were handpicked under a binocular. The purity of doubtful grains in the samples was controlled with immersion liquid.
EQUIPMENT AND METHODS OF ANALYSIS
Spectra of X-ray luminescence (XRL) are obtained using a self-constructed machinery. The machinery has been designed and created by the Institute of Atmospheric Optics of the Siberian Branch of Russian Academy of Sciences. The machinery used computer-controlled MDR-12 monochromator. Luminescence is excited by BSV-2 X-ray tube with Mo-target cathode from URS-55 device (U= 50 kV, I = 10 mA). Application of PMT-79, PMT-100 and changeable diffraction gratings with operating regions of 200-500 nm and 350-1000 nm allowed to cover the spectral range from 300 to 800 nm. To record the range of 600 - 800 nm, the cutoff filter Thorlabs FELH0600 is used. The measurements are carried out by continuous scanning of the selected spectral range at the rate of 1 nm/s. The intensity of the radiation is measured in relative units. The reproducibility of the spectra is monitored by repeated measurement and it was 95 %.
Integral thermoluminescence (TL) is recorded using the device, assembled according to the circuit for direct current measurement. The thermoluminoscope control system (TSL) includes high-voltage adjustable power supply unit for the photomultiplier tube (PMT-39 in light-protective thermally insulated chamber, spectral range 200-600 nm; this allowed us not to use optical filters), two direct-current amplifiers for the photomultiplier and the thermocouple units; oven-heating control unit; unit for the PMT and the thermocouple signals digitalization and transfer to the computer. Heating unit consists of the oven and the temperature controller, measuring the temperature by a chromelalumel thermocouple. The thermocouple and the heating unit are graduated by the reference points (29.76 [degrees]C - melting point Ga, 156.6 [degrees]C - solidification point in, 231.9 [degrees]C - solidification point Sn, 419.5 [degrees]C - solidification point Zn). Control of points is visual. The sample heating rate is linear, equal to 3.8-4 [degrees]C per second. For TL analysis, samples that have not been exposed to artificial irradiation are used, i.e. the natural TL is measured.
RESULTS AND DISCUSSION
All studied samples of rock-forming quartz of Novosibirsk-Ob Area exhibit luminescence under X- ray excitation. Table 1 summarizes the data on the XRL of quartz from granitoid massifs of Novosibirsk-Ob Area. It is remarkable that almost all XRL centers, except for [Mn.sup.2+], are pervasive in case of quartz. Moreover, the scatter of the emission intensities of different massifs is rather small, which may be explained by a common source of mineral formation. In general, these are excited oxygen states on the basis of silicon-oxygen and alumino-oxygen tetrahedra (Table 1)
Figure 2 shows the XRL spectra of quartz from different phases of the Ob, the Novosibirsk and the Kolyvan massifs, in order to emphasize certain distinct features of the formation conditions of these massifs. The [Fe.sup.3+] band prevails in the XRL spectrum of quartz from the Novosibirsk massif (leucogranites and granosyenite), while in the XRL spectrum of quartz from leucogranites of the Kolyvan and the Barlak massifs the O* band (620 nm) is dominant. It may be related to changes in acidic and redox parameters during the melt differentiation and variation in cooling rates.
In order to define the luminescence parameters more precisely, apart from the XRL spectra of the initial samples, we recorded the XRL spectra of the samples after a short calcination up to 500 [degrees]C (5-10 minutes in the usual mode of accessing oxygen in the air). The fact is that after calcination in the XRL spectra of quartz, a band of XRL with a maximum of 370 nm appears, which is a distinctive feature of these rocks quartz. This band manifested itself most intensively in the XRL spectra of the Novosibirsk Array (Fig. 3, Table 2).
Earlier it was shown that UV glow at 370 nm in calcined quartz can appear due to the presence of twinning (as a result of [beta]-[alpha] transitions), which facilitates the concentration of exciton type defects (Boroznovskaya and Bydtaeva, 2003; Boroznovskaya et al., 2016). In addition, the relationship of this band to the oxidative potential was earlier mentioned (Marazuev et al., 1995; Friedrich et al., 2017; Matrosov and Pogorelov, 1977). Thus, this XRL band appearance in quartz can indicate relatively high initial mineral formation temperatures (since [beta]-[alpha] transition is possible at the temperature of 573 [degrees]C) and an increased oxidative potential.
Table 2 presents data on the X-ray luminescence of rock-forming quartz from the KTFB granitoids.
Quartz of the granitoids in Kolyvan-Tomsk folded belt are marked by prominent emission bands of [Fe.sup.3+] (710-730 nm) and O* (620 nm) (Table 1; Fig. 2). XRL spectra of quartz of the granitoids in Kolyvan-Tomsk folded belt, including intensive XRL of [Fe.sup.3+] ions, indicate relatively high alkaline conditions within the ore-forming melt. Indeed, oxygen activity in the melt increases markedly as the content of alkali metal, especially potassium, increases (Kutolin, 1972; Nath, 1966). Apparently, this circumstance, which in turn ensures increased iron oxidation in alkaline melts, is the cause of intense radiation at 700-720 nm in quartz. The conclusion about the increased alkalinity of the mineral-forming melt for the KTSZ is confirmed by studies on the composition of biotites (Nebera et al., 2012) and feldspar luminescence (Boroznovskaya et al., 2012). However, it should be noted that the intensity of individual XRL bands varies relatively to each other. It provides an opportunity to implement quartz XRL spectra in solving the problems of the KTFB granitoid classification. Certain intra-massif variations in the XRL intensity are related to multiple phases of the massifs, as it obvious from Table 2 and Figure 2. The ratio of intensities of 620/710 bands turns out to be meaningful. The lowest ratio is observed in quartz of Biotite granite and Granosyenites of the Novosibirsk massif. It can be explained by the proximity of rocks to the enclosing frame, resulting in higher crystallization rate, which has determined the luminescence features of quartz of aplite-like the Novosibirsk massif granites.
As it is evident from Table 2, the Ob massif main phase quartz XRL spectra are similar to the Kolyvan and the Barlak massifs quartz XRL . They are marked by prominent XRL of intrinsic defects at 370 and 610-620 nm, commeasurable [Fe.sup.3+] XRL and emission in 400-500 nm range, equal for all massifs and related to aluminium centers and intrinsic imperfections. The spectra of the Novosibirsk massif quartz are unique (Figs. 2, 3; Table 2). They are characterized by intense [O*.sub.370] XRL, which may be due to higher formation temperature of this massif. The same samples are also marked by strong [Fe.sup.3+] XRL, commeasurable with XRL of endocontact facie of the Ob massif, which is related to high fugacity of oxygen. It may have occurred during the massif formation in the course of rock crumpling.
As for the XRL spectra of quartz from the rocks of the three phases and the endocontact of the Ob massif, the following facts should be noted. Prevalence of radiation from [Fe.sup.3+] (700 nm band) in the XRL spectrum of the endocontact quartz is related to faster cooling and influx of oxygen from the enclosing frame; faint [Fe.sup.3+] emission in the aplitic quartz (third phase) with intense radiation in the 620 nm band is most likely due to the final phase formation under conditions of slow cooling and lack of oxygen. With a lack of oxygen, weak radiation can also be associated in the 370 nm band. The relationship of this XRL band to the oxidative potential was indicated earlier (Matrosov and Pogorelov, 1977). Figure 4 shows the emission bands intensities in the XRL spectra of quartz for different intrusive phases and endocontacts of the Ob massif.
In general, the spectral composition of quartz radiation from various rocks of the Ob massif is characterized by a narrow scatter, which indicates the constancy of the physicochemical conditions of crystallization. The quartz XRL similarity of this massif different phases can be a consequence of the mineralization that is close in time and conditions. The exception is the third phase. The quartz luminescence of the third phase features can be associated with a discontinuity in time between the second and third phases, with the depletion of the mineral-forming medium by oxygen, with a change in the oxidation potential.
Natural thermoluminescence (TL) of studied quartz samples within the range of 180-320 [degrees]C may be due to presence of Al, Ge, Li, Na inclusions (Boroznovskaya et al., 2016; Pogorelov et al., 1979; Rink et al., 1993). Such a preservation of the light sum is most likely a consequence of an increased radiation background, which is a characteristic of granitoids.There are two broad peaks in the ranges of 180-240 [degrees]C (T1) and 260-300 [degrees]C (T2). The curve character is determined by the ratio between these maximums (Fig. 5). Prevalent emission at 180-220 [degrees]C in case of quartz from granosyenites of the Novosibirsk massif (Fig. 5, sample B) is related to increased number of clusters of Ge/Li centers within the capture range of "Al" luminescence centers (Pogorelov et al., 1981). This scenario suggests high concentrations of "Al"-centers as well, which may be the result of higher temperatures of mineral formation. TL of quartz from leucogranites of the Kolyvan massif has different nature (Fig. 5, sample K1). In this case, the intensity of T2 (260-300 [degrees]C) is often higher than that of T1 (180-240 [degrees]C) with total light sum being shifted towards higher temperature range, which is related both to uncoupling of Ge/Li and "Al" centers and to involvement of Na in the formation of TL centers, which may be the result of slow cooling of this massif. Geological data suggest that the Kolyvan massif is the most low-temperature one among the Novosibirsk-Ob Area granitoids.
Figure 6 shows luminescence curves of quartz from rocks of different phases and the endocontact of the Ob massif. The spectra of rocks of all phases are virtually identical, marked by a broad peak at 200-300 [degrees]C. This fact provides additional evidence for the conclusion on similar formation conditions for the rocks of different phases and the endocontact of the Ob massif.
The research makes it possible to elucidate features of the mineral formation conditions in the course of granitoid intrusions establishment within the collision areas of island-arc and subcontinental terrains. Studies on the sub-microscopic defects of rock-forming quartz of the Novosibirsk-Ob Area granitoids with the help of luminescence analysis led us to the following conclusions:
* Quartz luminescence of the examined granitoids is the result of the certain temperature of mineral formation and cooling rate.
* Identical of quartz XRL and TL from the granitoids of different massifs can be the result of similar conditions and mechanisms of the granitoids formation with close periods of establishment within the Novosibirsk-Ob area.
* The Novosibirsk massif XRL and TL quartz individuality was manifested in the intense XRL of [Fe.sup.3+] and TL at 180-220 [degrees] C, due to increased concentrations of Ge / Li centers inside the capture sphere of "Al" luminescence centers. This could be due to the high fugacity of oxygen, the increased temperature and the mineral formation rate in the crushing of rocks regime under tectonically active zone conditions.
All these suggestions are compliant with previous conclusions from the X-ray luminescence of feldspar on common source of the Novosibirsk-Ob Area granitoids formation (Boroznovskaya et al., 2012), which allows us to consider the KTFB granitoid magmatism as the result of natural magmatic differentiation of the parental magma, providing a viable possibility to implement the quartz emission spectra in solving the problems of typification of granitoid massifs and other geological formations. At the same time, the data provides evidence for the differences in the leucocratic magmatism of the area, allowing classification of the Kolyvan-Tomsk folded belt leucogranites into the leucogranites of the Novosibirsk massif (Mo-W type of mineralization) and the leucogranites of the Kolyvan and the Barlak massifs characterized by rare metal mineralization (stannic-tungstic-beryllic with silver).
The study is supported by the Ministry of Education and Science of the Russian Federation, government task No 2282.
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Nina Nikolayevna BOROZNOVSKAYA (*) and Tatyana Stepanovna NEBERA
National Research Tomsk State University, 634050 Tomsk, 36 Lenin Ave., Russia
(*) Corresponding author's e-mail: firstname.lastname@example.org
Received 8 October 2017
Accepted 7 March 2018
Available online 20 March 2018
Kolyvan-Tomsk folded belt
Table 1 A brief description of the possible luminescence centers in the quartz. Max, nm Center characteristics 320-340 Oxygen vacancy 330-360 Al[O.sub.4.sup.4-]/[Na.sup.+], [Li.sup.+], [H.sup.+] Ti[O.sub.4]/[Li.sup.+] 360-380 Exciton type centers O[??] Interstitial oxygen 370-390 Al[O.sub.4.sup.4-]/[Na.sup.+], [Li.sup.+], [H.sup.+] 380-400 Matrix defects Si[O.sub.2] 400-440 Si[O.sub.4.sup.3-]/[Na.sup.+], Al[O.sub.4.sup.4-]/[Na.sup.+] 450-470 Matrix defects Si[O.sub.2] 470-520 Al[O.sub.4.sup.4-]/[Li.sup.+] Impurity [Al.sup.3+] in place of [Si.sup.4+]; Al ions may be adjacent to Al. 570-590 Oxygen vacancy 570 [Mn.sup.2+] 620 Interstitial oxygen 700-720 [Fe.sup.3+] in place of [Si.sup.4+] or [Al.sup.3+] Max, nm References 320-340 Rink et al., 1993 330-360 Demars et al., 1996 Plotze and Wolf, 1996 360-380 Boroznovskaya and Bydtaeva, 2003, Boroznovskaya et al., 2016 Matrosov, Pogorelov, 1977 370-390 Votyakov et al., 1993 380-400 Tarashchan, 1978 400-440 Kuznetsov and Tarashchan, 1988, Boroznovskaya and Bydtaeva, 2003 450-470 Demars et al., 1996, Boroznovskaya et al., 2016, Gaft et al., 2005 470-520 Kuznetsov and Tarashchan, 1988, Boroznovskaya and Bydtaeva, 2003, Boroznovskaya et al., 2015 570-590 Gotze et al., 2001 570 Kuznetsov and Tarashchan, 1988 620 Yarovoy, 1996, Gotze et al., 2001, Boroznovskaya et al., 2015 700-720 Kuznetsov and Tarashchan, 1988 Table 2 Averaged data on the X-ray luminescence of rock-forming quartz from the Kolyvan-Tomsk folded belt granitoids. Rocks, phase X-ray luminescence intensity (relative units) in the (Number of bands of maximum radiation (nm) samples) O* O* O*, O* [Fe.sup.3+] 620 [Mn.sup.2+] 620 700-720 / 710 370 400-490 570 Ob massif Biotite-amphibolic granites, phase 1 (2) 0.17 0.20 0.18 0.65 0.55 1.18 Biotite granite, phase 1 (6) 0.23 0.35 0.20 0.58 0.50 1.16 Granosyenite, phase 1 (10) 0.22 0.35 0.20 0.40 0.30 1.33 Fine-grained granite, phase 2 (11) 0.17 0.25 0.21 0.50 0.30 1.67 Aplite-like granite, phase 3 (5) 0.02 0.19 0.22 0.60 0.10 6.00 Biotite granite endocontact (10) 0.11 0.17 0.21 0.40 0.70 0.57 Novosibirsk massif Biotite granite (10) 1.76 0.28 0.15 0.60 0.25 Granosyenite (10) 1.85 0.38 0.20 0.75 0.27 Novosibirsk massif (Mochishche stock) Leucogranites (10) 0.9 0.36 0.40 0.65 0.61 Barlak massif Leucogranites (10) 0.22 0.30 0.10 0.40 0.30 1.33 Kolyvan massif Leucogranites (10) 0.23 0.25 0.12 0.48 0.30 1.60 Footnotes: 1. XRL intensity values in the band of 370 nm are from the XRL spectra, obtained for quartz, which was precalcined to 500 [degrees] C. The other values are for the original quartz 2. The intensity values in each case were obtained by finding the arithmetic mean for several samples, the number of which is shown in the first column. The deviation from the arithmetic mean for a single sample was not more than 0.01-0.06. 3. XRL spectra were recorded by continuous luminescence recording in chosen range of wave-lengths with 1 nm/s speed. XRL intensity values are given in relative units and show luminescence intensity at particular points, which are maxima related to luminescence bands given in the table. Wave lengths ranges (400-490, 700-720) are given for some luminescence centers due to possibility of maximum shift within these ranges (XRL intensity value also corresponds to intensity at particular point that is luminescence band maximum). Deconvolution andintegration were not applied in this case.
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|Title Annotation:||ORIGINAL PAPER|
|Author:||Boroznovskaya, Nina Nikolayevna; Nebera, Tatyana Stepanovna|
|Publication:||Acta Geodynamica et Geromaterialia|
|Date:||Jan 1, 2018|
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