LIBS core imaging at kHz speed: Paving the way for real-time geochemical applications

This paper demonstrates the new capabilities of laser-induced breakdown spectroscopy (LIBS) to perform fast high-resolution multi-elemental mappings of geological samples. A rock sample with a 5-mm surface roughness and one with a plane surface were laser scanned at a repetition rate of 1 kHz with a...

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Bibliographic Details
Published in:Spectrochimica acta. Part B: Atomic spectroscopy 2018-12, Vol.150, p.43-48
Main Authors: Rifai, Kheireddine, Doucet, François, Özcan, Lütfü, Vidal, François
Format: Article
Language:English
Subjects:
Analytical methods
Distribution
Geochemistry
Geological samples
Imaging techniques
Instrumentation
Laser induced breakdown spectroscopy
Lasers
Mapping
Resolution
Rocks
Spatial discrimination
Spatial resolution
Spectroscopy
Spectrum analysis
Surface roughness
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Summary:This paper demonstrates the new capabilities of laser-induced breakdown spectroscopy (LIBS) to perform fast high-resolution multi-elemental mappings of geological samples. A rock sample with a 5-mm surface roughness and one with a plane surface were laser scanned at a repetition rate of 1 kHz with a spatial resolution of 50 μm, using the Mission: Coriosity platform from ELEMISSION Inc. The elemental mappings of the few cm2 surfaces for 6 elements were obtained, revealing high levels of detail and complexity in the element distribution. In addition, the distributions of 9 elements along linear segments on the rock surfaces reveal correlations between the elements which allow inferring the mineralogical content of the samples. The platform provides a novel approach for fast simultaneous mapping of several elements as it can acquire and process 1000 spectra per second, which was not technically possible with traditional LIBS instrumentation. In addition, the platform is coupled with advanced graphical algorithms allowing the direct visualization of the distribution of several elements on the same image. [Display omitted] •LIBS Fast elemental mapping up to 1 KHz with a spatial resolution down to 50 μm on ore sample.•Mapping of precious metals such as gold and silver on rock surface.•Identification of mineralogizes such pyrite, chalcopyrite, sphalerite and Electrum…
ISSN:0584-8547
1873-3565
DOI:10.1016/j.sab.2018.10.007