Chemistry, textures and physical properties of quartz — geological interpretation and technical application

Götze, Jens

doi:10.1180/minmag.2009.073.4.645

Cited by 236 publications

(159 citation statements)

References 85 publications

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“…Besides impurities in these inclusions of the quartz, some lattice elements in the hydrothermal quartz cannot be neglected. As shown in Figure 4, Götze (2009) [34] reported four substitutions between Si and impurity elements in a quartz lattice. In addition, substitution with interstitial charge compensator is suitable to be used for explaining occurrences of impurity elements in the hydrothermal quartz, because P mainly occurs in the apatite, and Ge is not detected by ICP analysis.…”

Section: Optical Microscope Analysismentioning

confidence: 99%

Mineralogy and Processing of Hydrothermal Vein Quartz from Hengche, Hubei Province (China)

2017

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Quartz occurs in many geological materials, and is used in numerous industrial fields as a raw material. Mineralogy and the processing of hydrothermal quartz were studied by optical microscope, electron probe microanalysis, scanning electron microscope, inductively coupled plasma-optical emission spectrometry, and inductively coupled plasma mass spectrometer. A combination of the geological occurrence of the quartz deposit, mineralogical studies, and the processing technologies of the hydrothermal quartz was accomplished. The results show that impurities within the quartz mainly include muscovite, hematite, apatite, and secondary fluid inclusions. The main chemical impurities are Al (353 µg·g −1 ), K (118 µg·g −1 ), Fe (61.2 µg·g −1 ), P (15.5 µg·g −1 ), Na (13.4 µg·g −1 ), Mg (11.8 µg·g −1 ), Ti (8.31 µg·g −1 ), and B (10.8 µg·g −1 ). Based on these results, a combined process consisting of calcination and fluoride-free pressure acid leaching was established to effectively decompose and dissolve the quartz, and remove gangue minerals and fluid inclusions. The calcination process not only removed volatile components; it also destroyed the crystal structure of gangue minerals and enhanced their release probabilities. The calcination process has a positive influence on the removal of impurity elements by the fluoride-free pressure acid leaching process. A total of 85.2 wt % and 84.0 wt % of impurity elements was removed using the leaching systems of HCl-NH 4 Cl and H 2 SO 4 -NH 4 Cl, respectively.

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Section: Optical Microscope Analysismentioning

confidence: 99%

Mineralogy and Processing of Hydrothermal Vein Quartz from Hengche, Hubei Province (China)

2017

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“…Variations in this ratio are indicative of the specific precursor defect populations in samples prior to irradiation, which are the product of their crystallisation history (Götze, 2009) and dose history. Despite differing initial ratios of red and UV-violet emissions, all of the samples exhibit reduction in the intensity of the UVviolet emission alongside enhancement of the red emission as a function of ion implantation.…”

Section: Interrelationships Between the Uv-blue And Red Emissionsmentioning

confidence: 99%

“…Red-IR (1.7 eV) luminescence in feldspar, another framework silicate, has also been linked to tetrahedral Fe 3+ using ESR (Finch and Klein, 1999). Red emissions at 1.88 eV have been related to a NBOHC, the concentration of which is dependent on precursor peroxy linkage and hydroxyl group populations (Bettiol et al, 1997;Götze, 2009;StevensKalceff and Phillips, 1995).…”

Section: The Red Emissionmentioning

confidence: 99%

“…Of the materials used for OSL studies, quartz is usually preferred (Aitken, 1998;Huntley et al, 1985). In addition, quartz has a range of industrial applications, which has rendered it the focus of intense research both into its physical and chemical properties, and its emission spectroscopy (see Götze, 2009; Krbetschek et al, 1997 for reviews). Numerous OSL dating applications to sediments of different ages (e.g.…”

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confidence: 99%

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The problem of dating quartz 1: Spectroscopic ionoluminescence of dose dependence

King

Finch

Robinson

et al. 2011

Radiation Measurements

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A suite of quartz samples of different provenances, irradiation, thermal and depositional histories were analysed using spectroscopic ionoluminescence (IL) to investigate variations in emission spectra as a function of cumulative radiation dosing. Protons were selected for implantation to mimic the effect of natural radiation over geological timescales. All samples exhibited depletion in the UV-violet emission (3.2-3.4 eV) with increasing cumulative dose, whilst the red emission (1.8-1.9 eV) increased. A power-law relationship exists between the two emissions. It is inferred that the luminescence emission of quartz is indicative of its radiation history, and spectral analyses could be used to determine the utility of different quartz samples for optically stimulated luminescence dating (OSL) where the detection range is limited to 3.4-4.6 eV. KeywordsSpectroscopic ionoluminescence, implantation, protons, quartz, optically stimulated luminescence dating. AbbreviationsIonoluminescence (IL), Ultra-violet (UV), Optically Stimulated Luminescence (OSL) IntroductionOSL is used as a radiation dosimeter method within Quaternary geochronology, archaeology and retrospective accident dosimetry. Of the materials used for OSL studies, quartz is usually preferred (Aitken, 1998;Huntley et al., 1985). In addition, quartz has a range of industrial applications, which has rendered it the focus of intense research both into its physical and chemical properties, and its emission spectroscopy (see Götze, 2009; Krbetschek et al., 1997 for reviews). Numerous OSL dating applications to sediments of different ages (e.g. Ballarini et al., 2003;Pawley et al., 2008), provenances (e.g. Preusser et al., 2006) and depositional environments (e.g. Thrasher et al., 2009;Wallinga, 2002) have been made. However, despite the development of the single-aliquot regenerative dose protocol (Murray and Wintle, 2000), it is currently not possible to date all quartz using OSL. This is often due to quartz's highly variable OSL quantum efficiency (QE). The controls over quartz OSL QE remain unclear but have been linked to geological provenance (Götze et al., 2004;Rink et al., 1993;Westaway, 2009), irradiation (Rink, 1994, transport and thermal histories (Pietsch et al., 2008;Preusser et al., 2006). However quartz with the same irradiation, source and depositional histories often exhibit highly variable emission intensities McFee and Tite, 1998).The light emitted by quartz most commonly comprises bands in the UV-blue and red/IR (Krbetschek et al., 1997). Risø readers, the most widely used OSL instrumentation, stimulate the quartz with diodes at 470±20 nm (2.6 eV) and measure the response through Hoya U340 filters . The transparency of these filters lies between 3.4 and 4.6 eV and only a part of the UV-blue emission band is monitored. The remainder of the emission (below 3.4 eV and above 4.6 eV) is unmeasured in conventional OSL but may contain significant dosimetry or geological provenance information.Ionoluminescence (IL, also known as ion beam lumin...

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“…Numerous studies have been carried out to correlate characteristic CL emission bands with certain defects (see, e.g. [4], [6], [7]). The Al and Ti distribution patterns in our study are frequently not correlated and both show uneven distribution indicating fast growth from inhomogeneous melts.…”

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confidence: 99%

Determination of Trace Elements in Quartz by Combined EPMA and CL Microspectrometry

et al. 2014

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Quartz eyes from different porphyry deposits were studied by electron probe microanalysis (EPMA) and hyperspectral cathodoluminescence (CL) mapping to determine their origin. These "eyes" are mm-sized crystals, which are commonly referred to as phenocrysts but in many cases may have formed after magma emplacement.Ti concentrations were determined on a JEOL JXA 8500F EPMA at 20 kV accelerating voltage, 200 nA beam current and 20 μm beam diameter, using two spectrometers with PET crystals in parallel and counting for 80 seconds on peak and 40 seconds each on two backgrounds, resulting in a detection limit of 10 ppm at 99% confidence. Further Ti, Al, and Fe measurements were performed on a Cameca SX100 EPMA at 15 kV, 200 nA, 5 μm, with counting times of 300 s for peak and 150 s each for two backgrounds. One LPET crystal was used fo Ti, two TAP for Al, and two LLiF for Fe, leading to detection limits of 12, 7, and 19 ppm respectively. Averages of 3 spots co-located in bands with similar panchromatic CL intensity were used where possible to improve the analytical precision. Due to a known background hole beneath the Ti Ka peak when using PET crystals [1], a blank correction was performed using the ultra pure silica glass Spectrosil 1000 (Saint Gobain). The blank correction was consistent over 17 analysis sessions spanning 15 months with +16 ± 2 ppm Ti, −27 ± 4 ppm Al, and −9 ± 8 ppm Fe. Hot Springs Quartz (Harvard 122838, [2]) yielded long term averages of 2 ± 3 ppm Ti, 34 ± 6 ppm Al, and 5 ± 7 ppm Fe. As trace data for this standard has not been published and concentrations might vary, laser ablation inductively coupled plasma mass spectrometry was employed to determine contents of 1.21 ± 0.01 ppm Ti, 53 ± 9 ppm Al, and <3 ppm Fe, which is in reasonable agreement with the EPMA data. Although light microscopy and CL indicate damage to the quartz during EPMA at these conditions, comparative measurements of quartz with higher trace content at shorter acquisition times, lower beam current, and larger beam diameter yielded similar results. This implies that even if structural damage to the quartz lattice occurs, Ti, Al, and Fe are not significantly mobilised in the process.Hyperspectral CL maps were collected on the same JEOL instrument with an Ocean Optics QE65000 grating CCD spectrometer at 20 kV, 40 nA, 1 μm, dwell time 40 ms, and stage step size 2 μm. Deconvolution of the CL spectra using the Chimage software revealed three peaks responsible for the total CL emission at energies of 1.93 eV, 2.05 eV and 2.72 eV (Fig. 1). The latter has previously been attributed to Ti 4+ centres [3] and correlates strongly with the Ti concentration determined by the EPMA point measurements (Fig. 1). In addition, a negative correlation between the 1.93 eV emission and the Al concentration is observed by CL-EPMA (Fig. 2) and confirmed by Fourier transform infrared microspectroscopy. This CL emission has previously been attributed to non-bridging oxygen hole centre defects

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Chemistry, textures and physical properties of quartz — geological interpretation and technical application

Cited by 236 publications

References 85 publications

Mineralogy and Processing of Hydrothermal Vein Quartz from Hengche, Hubei Province (China)

Mineralogy and Processing of Hydrothermal Vein Quartz from Hengche, Hubei Province (China)

The problem of dating quartz 1: Spectroscopic ionoluminescence of dose dependence

Determination of Trace Elements in Quartz by Combined EPMA and CL Microspectrometry

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