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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 51, Iss. 7 — Mar. 1, 2012
  • pp: B213–B222

Correlation of limestone beds using laser-induced breakdown spectroscopy and chemometric analysis

Nancy J. McMillan, Carlos Montoya, and Warren H. Chesner  »View Author Affiliations


Applied Optics, Vol. 51, Issue 7, pp. B213-B222 (2012)
http://dx.doi.org/10.1364/AO.51.00B213


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Abstract

Correlation of limestone beds is commonly based on a variety of features, including the age of the bed, the fossil assemblage, internal sedimentary structures, and the relationship to other units in the stratigraphy. This study uses laser-induced breakdown spectroscopy (LIBS) to correlate 16 limestone beds from Kansas, USA, using three multivariate techniques: (1) soft independent modeling of class analogy (SIMCA) classification, (2) a partial least squares regression, 1 variable (PLS-1) model in which the spectra are regressed against a matrix of the indicator variables 1 through 16, and (3) a matching algorithm that consists of a sequence of binary PLS-1 models. Each gravel-sized limestone particle was analyzed by one LIBS shot; ten spectra were averaged into a single spectrum for chemometric analysis. The entire spectrum (198–969 nm wavelength) is used for multivariate analysis; the only preprocessing is averaging. The SIMCA and PLS-1 models fail to discriminate among the beds, which are chemically similar. In contrast, the matching algorithm has a success rate of 95% to 96%, using half of the spectra to train the model and the other half of the spectra to validate it. However, 100% success can be accomplished by accepting the classification of the majority of spectra for a given bed as the correct classification. This study indicates that LIBS can be applied to complex geologic correlation problems and provide rapid, accurate results.

© 2012 Optical Society of America

OCIS Codes
(160.0160) Materials : Materials
(300.6365) Spectroscopy : Spectroscopy, laser induced breakdown

History
Original Manuscript: October 5, 2011
Revised Manuscript: December 31, 2011
Manuscript Accepted: January 25, 2012
Published: March 1, 2012

Citation
Nancy J. McMillan, Carlos Montoya, and Warren H. Chesner, "Correlation of limestone beds using laser-induced breakdown spectroscopy and chemometric analysis," Appl. Opt. 51, B213-B222 (2012)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-51-7-B213

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