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http://dx.doi.org/10.7780/kjrs.2007.23.6.493

Extraction of Pyrophyllite Mineralized Zone using Characteristics of Spectral Reflectance of Rock Samples  

Chi, Kwang-Hoon (Geoscience Information Center, Korea Institute of Geoscience and Mineral Resources (KIGAM))
Lee, Hong-Jin (Geoscience Information Center, Korea Institute of Geoscience and Mineral Resources (KIGAM))
Publication Information
Korean Journal of Remote Sensing / v.23, no.6, 2007 , pp. 493-500 More about this Journal
Abstract
In general, it accomplished a spectral reflectance analysis to be, the measurement results appear differently by targets, methods and condition. This paper presents a standard methodology for preprocessing mineral/rock samples and setting the distance from a target to the sensor, and then examines closely the spectral features for pyrophyllite. The size of mineral/rock samples is various according to the condition and scale of outcrop, so it is important to maintain the distance between the sensor and the sample. Before standardization for preprocessing samples and the sensor and sample distance, we prepare various rock samples (Quartz Porphyry) such as natural rock, pebble, powder and cutting rock. For a qualitative analysis to minimize the effect of surface condition of the sample and shadow, we maintains the distance from the sample to the sensor at 30cm and measures three times repeatedly for cutting the sample at $1{\sim}2cm$ thickness. To illustrate the proposed methodology, a case study for pyrophyllite was carried out. In this study, pyrophyllite showed an absorption pattern at wave length of 1.406nm, 1,868nm, 2.180nm and 2.309nm, and a higher grade represented strong absorption at 1.406nm and 2.180 nm. These absorption feature corresponds the band 7 of LANDSAT TM and band 8 of ASTER imageries. So, using these results, pyrophyllite deposits were extracted from other features (such as barren area, concrete area, bed of river, stone pit area etc.).
Keywords
spectral reflectance; standardization; pyrophyllite; mineralized zone;
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