Spectroscopy, Luminescence and Radiation Centers in Minerals

Marfunin, A. S.

doi:10.1007/978-3-642-67112-8

Cited by 415 publications

(254 citation statements)

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“…This fluorescence is most likely due to the presence of trace impurities in the sample. Calcite has long been known to be luminescent (Nichols et al, 1918) and red broadband emission (centered in the mid-600 nm region, as observed in this study) is due to the presence of trace amounts of Mn 2+ (El Ali et al, 1993;Marfunin, 1979). Spectra obtained using red excitation do not show fluorescence (Figure 3).…”

Section: Carbonatessupporting

confidence: 57%

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Laser Raman spectroscopy as a technique for identification of seafloor hydrothermal and cold seep minerals

2009

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Section: Carbonatessupporting

confidence: 57%

“…These may be fluorescence bands due to impurities or trace materials in the hydrothermal anhydrite. No significant impurity phases or discolorations were visible under the microscope, but the presence of Mn and rare earth elements has been shown to produce luminescent bands in natural anhydrite (Marfunin, 1979).…”

Section: Sulfatesmentioning

confidence: 95%

Laser Raman spectroscopy as a technique for identification of seafloor hydrothermal and cold seep minerals

2009

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“…On an atomic level, many different processes contribute to these effects ranging from the generation and rapid movement of dislocations (thereby creating exciton pairs, i.e., electrons and holes, which give off light upon recombination) to high local charges developing across rapidly advancing fracture wedges. The resulting high fields lead to discharges across the opening gap, to local, shortcircuited current, to neutral and electronically excited atom emission, and to visible light [Dickinson et al, 1986 [Marfunin, 1979]. Being radicals, O---Oo and XO43+ -= O3X/ø' are reactive.…”

Section: Known Sources Of Electric Charges In Rocksmentioning

confidence: 99%

Time‐resolved study of charge generation and propagation in igneous rocks

Freund¹

2000

J. Geophys. Res.

185

137

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Abstract. Electrical resistivity changes, ground potentials, electromagnetic (EM), and luminous signals preceding or accompanying earthquakes have been reported many times, in addition to ground uplift and tilt and other parameters. However, no concept exists that would tie these diverse phenomena together into a physically coherent model. Using low-to medium-velocity impacts to measure electrical signals with microsecond time resolution, it is observed that when gabbro and diorite cores are impacted at relatively low velocities, --100 m/s, highly mobile charge carriers are generated in a small volume near the impact point. They spread through the rocks, causing electric potentials exceeding +400 mV, EM, and light emission. As the charge cloud spreads, the rock becomes momentarily conductive. When a granite block is impacted at higher velocity, --1.5 km/s, the propagation of the P and S waves is registered through the transient piezoelectric response of quartz. After the sound waves have passed, the surface of the granite block becomes positively charged, suggesting the same charge carriers as observed during the lowvelocity impact experiments, expanding from within the bulk. which all nominally anhydrous minerals incorporate when crystallizing in H20-laden environments. The fact that positive holes can be activated by low-energy impacts, and their attendant sound waves, suggests that they can also be activated in the crust by microfractures during the dilatancy phase. Depending on where in the stressed rock volume the charge carriers are activated, they will form rapidly moving or fluctuating charge clouds that can account for earthquake-related electrical signals and EM emission. Wherever such charge clouds intersect the surface, high fields are expected, causing electric discharges and earthquake lights.

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“…Thus, it is possible to reconstruct the mineral-forming processes or the trace mineral deposits (Götze et al, 2001). The spectral analysis of CL emission is an effective method to analyze the real structure of solids (Marfunin, 1979). Accordingly, a relationship can be observed between the CL emissions and presence of some transition metal elements.…”

Section: Discussionmentioning

confidence: 99%

Optical and Cathodoluminescence Investigations of the Green Microcrystalline (Chrysoprase) Quartz

Hatipoğlu¹,

Yardımcı²

2014

JLA

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Gem-quality green cryptocrystalline silica formation is relatively rare in nature, and has an interesting mineralogical crystallization and irradiation response of the fine fibrous silica. Chemical analyses of the green material reveal remarkable concentrations of some trace elements, such as nickel, iron, and chrome. They are certainly responsible for producing of the individual color production and irradiation luminescence response. Optical absorption spectroscopy shows that the dark green coloration is due to light transmittance at 528 nm in the visible region as a result of absorbance peak at 645 nm and about 360-410 nm absorbance band gap. These optical absorbance gaps are due to not only Ni ion content (4600 ppm) but also, Fe ion (13600 ppm) and Cr ion (823 ppm) contents. The cathodoluminescence spectra of the green material were taken into consideration in this study, and they were evaluated using "surpher, grapher, and axum" of the computer programs. In the spectra of alternative current cathodoluminescence with two-dimension, one major spectral emission band appears at readable intensity and magnitude in 90 Hz in the yellow wavelength region at 585 nm. In addition, the two-dimension cathodoluminescence spectra show that only the other major spectral emission band of cathodoluminescence appears at 90 Hz frequency in the green wavelength region at 530 nm.

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Spectroscopy, Luminescence and Radiation Centers in Minerals

Cited by 415 publications

References 0 publications

Laser Raman spectroscopy as a technique for identification of seafloor hydrothermal and cold seep minerals

Laser Raman spectroscopy as a technique for identification of seafloor hydrothermal and cold seep minerals

Time‐resolved study of charge generation and propagation in igneous rocks

Optical and Cathodoluminescence Investigations of the Green Microcrystalline (Chrysoprase) Quartz

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