Graph presenting the KDE distribution for each database from the Grasshopper porphyric prospect. In the Figure is compared the OreXpress™ database (grey) against TerraSpec™ 25FEB2018 (blue), TerraSpec™13MAR2018 (yellow), and TerraSpec™ 14FEB2018 (orange). It can also be observed the generalized 2 nm discrepancy between both devices.

Publicado

2024-12-09

Evaluation of normalization methods applied to Short-Wavelength Infrared (SWIR) spectroscopy mineral databases from multiple instruments and for vectoring analysis exploration

Evaluación de métodos de normalización aplicados a bases de datos minerales de Espectrografía de Infrarrojo Cercano (SWIR) provenientes de múltiples instrumentos y para análisis de vectores de exploración

DOI:

https://doi.org/10.15446/rbct.n56.113445

Palabras clave:

Reflectance spectroscopy, SWIR, White mica, database normalization (en)
Espectroscopía de reflectancia, SWIR, Mica blanca, normalización de bases de datos (es)

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Autores/as

Over the past decade, short-wave infrared (SWIR) spectroscopy has made significant advances in detecting geochemical variations in minerals like white mica, alunite, and chlorite for exploring hydrothermal ore deposits. These variations provide valuable clues, indicating changes in temperature, pH, and fluid oxidation state towards the mineralized center. However, small calibration differences among devices challenge data integration. This study evaluates the 2200 nm Al-OH absorption feature in four white mica SWIR spectroscopy databases collected by TerraSpec™ and OreXpress™ from samples at the Grasshopper porphyry prospect. It evaluates three normalization methodologies: rescaling, mean normalization, and Z-score, yielding p-values for successful data merging of up to 0.75. Findings suggest effective normalization methods across devices, reducing biases from uncalibrated spectrometers. This research offers a methodology to correct SWIR database biases, facilitating accurate data integration across instruments for vectoring analysis.

Durante la última década, la espectroscopía de infrarrojo de onda corta (SWIR) ha experimentado avances significativos en la detección de variaciones geoquímicas en minerales como la mica blanca, la alunita y la clorita para explorar depósitos de minerales hidrotermales. Estas variaciones proporcionan pistas valiosas, indicando cambios en la temperatura, el pH y el estado de oxidación del fluido hacia el centro mineralizado. Sin embargo, las pequeñas diferencias de calibración entre dispositivos representan un desafío para la integración de datos. Este estudio evalúa la característica de absorción del Al-OH a 2200 nm en cuatro bases de datos de espectroscopía SWIR de mica blanca recopiladas por TerraSpec™ y OreXpress™ a partir de muestras en el prospecto de pórfido Grasshopper. Se analizan tres metodologías de normalización: reescalado, normalización de la media y variable centrada reducida, obteniendo valores de p para la fusión exitosa de datos de hasta 0.75. Los hallazgos sugieren métodos de normalización efectivos entre dispositivos, reduciendo sesgos de espectrómetros no calibrados. Esta investigación ofrece una metodología para corregir sesgos de la base de datos SWIR, facilitando la integración precisa de datos entre instrumentos para análisis de vectores.

Referencias

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Cómo citar

APA

Paredes, J. C., Trigos , Y. C. y Uribe-Mogollon, C. (2024). Evaluation of normalization methods applied to Short-Wavelength Infrared (SWIR) spectroscopy mineral databases from multiple instruments and for vectoring analysis exploration. Boletín de Ciencias de la Tierra, (56), 47–53. https://doi.org/10.15446/rbct.n56.113445

ACM

[1]
Paredes, J.C., Trigos , Y.C. y Uribe-Mogollon, C. 2024. Evaluation of normalization methods applied to Short-Wavelength Infrared (SWIR) spectroscopy mineral databases from multiple instruments and for vectoring analysis exploration. Boletín de Ciencias de la Tierra. 56 (ago. 2024), 47–53. DOI:https://doi.org/10.15446/rbct.n56.113445.

ACS

(1)
Paredes, J. C.; Trigos , Y. C.; Uribe-Mogollon, C. Evaluation of normalization methods applied to Short-Wavelength Infrared (SWIR) spectroscopy mineral databases from multiple instruments and for vectoring analysis exploration. Bol. Cienc. Tierra 2024, 47-53.

ABNT

PAREDES, J. C.; TRIGOS , Y. C.; URIBE-MOGOLLON, C. Evaluation of normalization methods applied to Short-Wavelength Infrared (SWIR) spectroscopy mineral databases from multiple instruments and for vectoring analysis exploration. Boletín de Ciencias de la Tierra, [S. l.], n. 56, p. 47–53, 2024. DOI: 10.15446/rbct.n56.113445. Disponível em: https://revistas.unal.edu.co/index.php/rbct/article/view/113445. Acesso em: 14 ene. 2025.

Chicago

Paredes, Juan Camilo, Yan Carlos Trigos, y Camilo Uribe-Mogollon. 2024. «Evaluation of normalization methods applied to Short-Wavelength Infrared (SWIR) spectroscopy mineral databases from multiple instruments and for vectoring analysis exploration». Boletín De Ciencias De La Tierra, n.º 56 (agosto):47-53. https://doi.org/10.15446/rbct.n56.113445.

Harvard

Paredes, J. C., Trigos , Y. C. y Uribe-Mogollon, C. (2024) «Evaluation of normalization methods applied to Short-Wavelength Infrared (SWIR) spectroscopy mineral databases from multiple instruments and for vectoring analysis exploration», Boletín de Ciencias de la Tierra, (56), pp. 47–53. doi: 10.15446/rbct.n56.113445.

IEEE

[1]
J. C. Paredes, Y. C. Trigos, y C. Uribe-Mogollon, «Evaluation of normalization methods applied to Short-Wavelength Infrared (SWIR) spectroscopy mineral databases from multiple instruments and for vectoring analysis exploration», Bol. Cienc. Tierra, n.º 56, pp. 47–53, ago. 2024.

MLA

Paredes, J. C., Y. C. Trigos, y C. Uribe-Mogollon. «Evaluation of normalization methods applied to Short-Wavelength Infrared (SWIR) spectroscopy mineral databases from multiple instruments and for vectoring analysis exploration». Boletín de Ciencias de la Tierra, n.º 56, agosto de 2024, pp. 47-53, doi:10.15446/rbct.n56.113445.

Turabian

Paredes, Juan Camilo, Yan Carlos Trigos, y Camilo Uribe-Mogollon. «Evaluation of normalization methods applied to Short-Wavelength Infrared (SWIR) spectroscopy mineral databases from multiple instruments and for vectoring analysis exploration». Boletín de Ciencias de la Tierra, no. 56 (agosto 30, 2024): 47–53. Accedido enero 14, 2025. https://revistas.unal.edu.co/index.php/rbct/article/view/113445.

Vancouver

1.
Paredes JC, Trigos YC, Uribe-Mogollon C. Evaluation of normalization methods applied to Short-Wavelength Infrared (SWIR) spectroscopy mineral databases from multiple instruments and for vectoring analysis exploration. Bol. Cienc. Tierra [Internet]. 30 de agosto de 2024 [citado 14 de enero de 2025];(56):47-53. Disponible en: https://revistas.unal.edu.co/index.php/rbct/article/view/113445

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