Trace element incorporation into quartz: A combined study by ICP-MS, electron spin resonance, cathodoluminescence, capillary ion analysis, and gas chromatography

Götze, Jens; Plötze, Michael; Graupner, Torsten; Hallbauer, D. K.; Bray, Colin J.

doi:10.1016/j.gca.2004.01.003

Cited by 213 publications

(156 citation statements)

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“…Leaching experiments have demonstrated that aerosol Fe solubility is highly dependent on the chemical form and reactivity of Fe in each sample and, in particular that Fe is significantly more labile in clay minerals than in more refractory phases such as quartz which has a low Fe content of typically only a few µg g -1 (Götze et al, 2004) compared to 3-4 % for illite clays (Jeong and Achterberg, 2014;Journet et al, 2008;Schroth et al, 2009). The octahedral sites of clays in the crystal structures of clay minerals can accommodate a significant quantity of Fe.…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

Aerosol time-series measurements over the tropical Northeast Atlantic Ocean: Dust sources, elemental composition and mineralogy

et al. 2015

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The North Atlantic receives the largest dust loading of any of the world's oceans due to its proximity to North African deserts and prevailing wind patterns. The supply of biologically important trace elements and nutrients via aerosols has an important influence on biogeochemical processes and ecosystems in this ocean region. In this study we continuously sampled aerosols between July 2007 and July 2008 at the Cape Verde Atmospheric Observatory (CVAO), which is situated on an island group close to the North African continent and under the Saharan/Sahelian dust outflow path. The aim of our work was to investigate temporal variations in aerosol concentration, composition and sources in the Cape Verde region over a complete seasonal cycle, and for this purpose we undertook mineralogical and chemical (42 elements ). These observations have been attributed to dust transport occurring in higher altitude air layers and mainly north of the Cape Verde during summer, whilst in winter the dust transport shifts south and occurs in the lower altitude trade winds with consequent greater influence on the Cape Verde region. The elemental composition of the aerosols closely agreed with mean upper crustal abundances, with the exception of elements with pronounced anthropogenic sources (e.g. Zn and Pb) and major constituents of sea water (Na and Mg). A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT3 Mineral analysis showed that clays were the most abundant mineral fraction throughout the whole sampling period, with an increase in quartz and clays during strong dust events and an associated decrease in calcite. This could have important implications for the estimation of release of for exampleFe from mineral dust with clays having a higher Fe solubility than quartz.The elemental composition and mineralogy of aerosol samples collected during the cruise were indistinguishable from those collected at the CVAO during the same period, although mean atmospheric Al was 65% higher at the CVAO than those measured on the ship due to the irregular and uneven nature of dust transport.Air mass back-trajectories showed an important role for southern source regions of the NorthAfrican deserts during summer, with 92.5% of the samples indicating a contribution from the Sahel.Significantly elevated ratios of V, Ni, Cu, Zn, Cd and Pb with Al were present in samples originating from the Sahel compared with samples with a more northerly origin. This was likely due to enhanced anthropogenic emissions related to the greater population densities in the Sahel compared with the less developed Saharan regions further north.Ratios of other elements and trends in rare earth elements could however not be used to distinguish differences in source regions. Similar source material compositions, the mixing of dust from different regions during transport, and the pooling of samples over a 1-3 day collection period appears to have diluted specific signals from source regions.

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Section: Accepted M Manuscriptmentioning

confidence: 99%

Aerosol time-series measurements over the tropical Northeast Atlantic Ocean: Dust sources, elemental composition and mineralogy

et al. 2015

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“…This results in the formation of [AlO 4 /M + ]° centres, where the Al 3+ is charge compensated by either Li + , Na + (Perny et al, 1992) or H + Luff and Townsend, 1990). It should be noted that other entities such as Ge 4+ , Ti 4+ and H 3 O 4 may also substitute for Si 4+ , although such substitutions are less thermodynamically favoured and are dependent upon the crystallisation conditions (Götze et al, 2004). Similarly the abundance of the different charge-compensating alkali ions is also determined by the crystallisation conditions: e.g.…”

Section: The Uv-blue Emissionsmentioning

confidence: 99%

“…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).…”

Section: Introductionmentioning

confidence: 99%

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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“…Aluminum is present in detectable concentrations in almost all (excepted two) analyzed spots and its abundance ranges from 36 to 6 311 ppm, thus showing that Al is the most important trace element in "quartz eyes" from the NFR Freegold Mountain project samples. This is typical of quartz from many geologic environments where Al is the most abundant trace element (Götze and Plötze 1997;Götze et al 2004;Müller et al 2005;Rusk et al 2006). The Al content of quartz was not found to correlate with the peraluminosity of the melt as also reported by Breiter and Müller (2009).…”

Section: Figurementioning

confidence: 79%

The nature of “quartz eyes” hosted by dykes associated with Au-Bi-As-Cu, Mo-Cu, and Base-metal-Au-Ag mineral occurrences in the Mountain Freegold region (Dawson Range), Yukon, Canada

Betsi¹,

Lentz

2012

J. Geosci.

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Various origins have been assigned to rounded to subrounded and elliptical quartz megacrysts ("quartz eyes") in dyke rocks associated with mineral deposits/occurrences worldwide. An exact interpretation of their nature is likely to tightly constrain the petrogenesis of the host rocks, and by association may be critical in evaluating genetic models for spatially associated ore minerals. ChromaSEM-CL imaging and electron probe microanalysis (EPMA) of "quartz eyes" within porphyry dykes associated with Au-Bi-Cu-As, Mo-Cu, and base-metal-Au-Ag mineral occurrences across the Northern Freegold Resources (NFR) property in the Dawson Range of Yukon Territory, Canada, reveals that the cathodoluminescence (CL) response of quartz is a function of its trace-element abundance(s). Bright blue luminescent growth zones are in most cases richer in Fe (up to 8839 ppm) and Ti (up to 229 ppm) relative to CL dark growth zones, with up to 41 times lower concentration of these elements. Assuming a TiO 2 = 1, the Ti-poor dull cores consistently recorded lower temperatures (mostly < 600 °C) compared to Ti-rich brighter blue rims (up to 860 °C). This suggests either overgrowth on xenocrystic cores or an increase in crystallization temperature. The temperature rise likely reflects magma mixing, and is therefore consistent with the phenocryst/phenoclasts having formed in a magma chamber rather than by secondary processes. Also, the great variability in composition and temperature of crystallization and/or reequilibration of brighter blue growth zones of two quartz crystals (660 °C and 855 °C) from a single sample suggests that multiple episodes of magma mixing and incremental growth of parental magma chambers occurred. Some "quartz eyes" are overprinted by variably oriented, bifurcating, and anastomosing fluid migration trails ("splatter and cobweb textures") of red to reddish-brown CL quartz that is in most cases of low-temperature origin, and trace-elements poor, thus implying interaction of deuteric fluids with quartz phenocrysts/phenoclasts. The presence of "quartz eye" crystals with broken and angular blue cores, overgrown by oscillatory-zoned rims in which the zoning pattern does not correspond with the crystal boundaries, further suggests that some quartz crystals had been explosively fragmented (phenocrysts) and are now hosted in a recrystallized tuffisitic groundmass. The volatile exsolution that likely accompanied both magma mixing and decompression (as suggested by dendritic quartz, fine-grained recrystallized tuffisitic groundmass, and corroded quartz grains) was probably an important process that could have favoured the ore formation.

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Trace element incorporation into quartz: A combined study by ICP-MS, electron spin resonance, cathodoluminescence, capillary ion analysis, and gas chromatography

Cited by 213 publications

References 48 publications

Aerosol time-series measurements over the tropical Northeast Atlantic Ocean: Dust sources, elemental composition and mineralogy

Aerosol time-series measurements over the tropical Northeast Atlantic Ocean: Dust sources, elemental composition and mineralogy

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

The nature of “quartz eyes” hosted by dykes associated with Au-Bi-As-Cu, Mo-Cu, and Base-metal-Au-Ag mineral occurrences in the Mountain Freegold region (Dawson Range), Yukon, Canada

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