Abstract
Infrared spectroscopy has the capability to determine the mineralogical composition of geologic materials. Its reflectance spectra contain diagnostic spectral absorption feature characteristics that can be used for analyzing the mineral chemistry and chemical composition of volcanic material samples. In this research, we analyze the infrared spectral shapes and properties of volcanic materials at specific wavelength ranges in order to identify compositional information of the samples. We used volcanic material samples such as ash and rocks (tuffs) collected from Sinabung volcano, North Sumatra, Indonesia. Reflectance spectra of the samples were characterized using infrared spectroscopic method. Variation in depth of spectral absorption features and reflectance values of ash and rock samples related to grain size, chemical and mineralogical composition, and surface roughness of the samples. The spectroscopic characteristics showed that these volcanic samples exhibit a strong Al-OH absorption feature centered at ~2200 nm. It indicates that the samples contain predominantly clay or other phyllosilicate minerals. Reflectance spectroscopy can be used to extract compositional information of mineralogy in volcanic material samples.
Highlights
Mount Sinabung, a stratovolcano located in North Sumatra, Indonesia, has erupted for several time in the last few years [1,2]
In this study we analyze mineralogical composition of volcanic material samples based on spectroscopic characteristics of infrared reflectance spectra
Volcanic material samples The volcanic material samples were obtained from the surrounding area of Mount Sinabung, North Sumatra, Indonesia (Figure 1)
Summary
Mount Sinabung, a stratovolcano located in North Sumatra, Indonesia, has erupted for several time in the last few years [1,2]. The current Sinabung volcano eruption (19 February 2018) produced a huge gray ash column into the air and spread over a large area as observed by weather radar [3]. The volcanic ash resulted from these eruptions have affected various problems on human health, economic development, and physical properties of environment at the surrounding area of the moutntain. There are various analytical methods have been applied to determine chemical and mineralogical composition volcanic materials [5,6,7]. These conventional approaces are costly and impracticality for sample preparation and field measurement. In this study we analyze mineralogical composition of volcanic material samples based on spectroscopic characteristics of infrared reflectance spectra
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