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Laser-induced breakdown spectroscopy (LIBS) as a tool for in situ mapping and textural interpretation of lithium in pegmatite minerals
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30. September 2015
Abstract
Laser-induced breakdown spectroscopy (LIBS) offers an efficient method for qualitative and semiquantitative analysis of light elements (Z < 10), including lithium. This relatively inexpensive analytical tool provides very rapid analysis with little sample damage, requiring minimal sample preparation. In principle, LIBS is a form of atomic emission spectroscopy, relying on characteristic spectra emitted from plasma generated by a high-energy laser pulse striking a sample (solid, liquid, or gas).
In this study, LIBS mapping was applied to petrographically characterized samples of hydrothermally altered spodumene from the Neoarchaean Mt. Cattlin lithium pegmatite deposit. Spodumene (LiAlSi2O6) is the ore mineral in this deposit, but lithium is distributed in variety of minerals including primary micas and tourmaline, as well as in the alteration mineralogy of spodumene. Mapping was carried out using a grid of analysis spots of 125 μm diameter, spaced at 200 μm intervals, on a sample surface cut by a diamond saw blade without further preparation. Results from mapping of lithium in these samples effectively discriminated between spodumene, its alteration mineralogy, and matrix silicate minerals of the matrix. However, quantification of LIBS results using lithium-doped borosilicate glasses as standards was limited due to issues with the sensitivity of matrix matching of standards and self-absorption effects at Li2O values greater than ~2 wt%, especially at values greater than ~6 wt%. The results of this study testify to the effectiveness of LIBS as a mapping tool for light elements, which may be used as a complement to other mapping techniques. Mapping of lithium in pegmatite minerals has important applications in exploration, evaluation, and beneficiation of lithium pegmatite ore bodies.
Received: 2014-8-15
Accepted: 2015-4-25
Published Online: 2015-9-30
Published in Print: 2015-10-1
© 2015 by Walter de Gruyter Berlin/Boston
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Schlagwörter für diesen Artikel
Lithium;
pegmatite;
LIBS;
mineral mapping;
laser-induced breakdown spectroscopy
Artikel in diesem Heft
- Reaching new boundaries for in-situ U-Th geochronology
- Normal to inverse transition in martian spinel: Understanding the interplay between chromium, vanadium, and iron valence state partitioning through a crystal-chemical lens
- Accuracy of timescales retrieved from diffusion modeling in olivine: A 3D perspective
- Phosphoran olivine overgrowths: Implications for multiple impacts to the Main Group pallasite parent body
- Diffusion of phosphorus in olivine and molten basalt
- Oceanic lavas sampling the high-3He/4He mantle reservoir: Primitive, depleted, or re-enriched?
- U-Th baddeleyite geochronology and its significance to date the emplacement of silica undersaturated magmas
- Polycrystallinity of green rust minerals and their synthetic analogs: Implications for particle formation and reactivity in complex systems
- Fe pre-enrichment: A new method to counteract iron loss in experiments on basaltic melts
- Fe-Mg diffusion in spinel: New experimental data and a point defect model
- Age, petrochemistry, and origin of a REE-rich mineralization in the Longs Peak-St. Vrain batholith, near Jamestown, Colorado (U.S.A.)
- Laser-induced breakdown spectroscopy (LIBS) as a tool for in situ mapping and textural interpretation of lithium in pegmatite minerals
- Evidence for Nb2+ and Ta3+ in silicate melts under highly reducing conditions: A XANES study
- Elastic softening of leucite and the lack of polar domain boundaries
- New thermobarometers for martian igneous rocks, and some implications for secular cooling on Mars
- An updated calibration of the plagioclase-liquid hygrometer-thermometer applicable to basalts through rhyolites
- Water effects on the anharmonic properties of forsterite
- Synthesis and structure of a stuffed derivative of α-quartz, Mg0.5AlSiO4
- Equation of state and elasticity of the 3.65 Å phase: Implications for the X-discontinuity
- Ca-Zn solid solutions in C2/c pyroxenes: Synthesis, crystal structure, and implications for Zn geochemistry
- Aluminum environments in synthetic Ca-Tschermak clinopyroxene (CaAlAlSiO6) from Rietveld refinement, 27Al NMR, and first-principles calculations
- Trioctahedral Fe-rich micas: Relationships between magnetic behavior and crystal chemistry
- High-pressure compressibility and phase stability of Mn-dolomite (kutnohorite)
- Composition dependence of spin transition in (Mg,Fe)SiO3 bridgmanite
- Oriented multiphase needles in garnet from ultrahigh-temperature granulites, Connecticut, U.S.A.
- Solubility and solution mechanisms of chlorine and fluorine in aluminosilicate melts at high pressure and high temperature
- Volatiles in magmas related to the Campanian Ignimbrite eruption: Experiments vs. natural findings
- Aluminosilicate melts and glasses at 1 to 3 GPa: Temperature and pressure effects on recovered structural and density changes
- Role of volatiles (S, Cl, H2O) and silica activity on the crystallization of haüyne and nosean in phonolitic magmas (Eifel, Germany and Saghro, Morocco)
- P-V-T equation of state and high-pressure behavior of CaCO3 aragonite
- A possible new Al-bearing hydrous Mg-silicate (23 Å phase) in the deep upper mantle
- Synthesis of large wadsleyite single crystals by solid-state recrystallization
- Decagonite, Al71Ni24Fe5, a quasicrystal with decagonal symmetry from the Khatyrka CV3 carbonaceous chondrite
- Earth’s “missing” minerals
- Magnetite-rutile symplectite derived from ilmenite-hematite solid solution in the Xinjie Fe-Ti oxide-bearing, mafic-ultramafic layered intrusion (SW China)
- New Mineral Names
- Book Review: Arsenic: Environmental Geochemistry, Mineralogy, and Microbiology, RIMG Volume 79.
