휴대용 XRF와 변질지수를 이용한 강원도 풍촌층 석회암 지역 열수변질에 관한 연구
Determination of Alteration Indexes using a Portable X-ray Fluorescence Analyzer: A Case Study on Hydrothermal Alteration of Limestones from Gangwon Province, South Korea
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본 연구에서는 석회암 지역의 변질대를 규명하고 정량적으로 분류하기 위해 기존의 변질지수 및 본 연구에서 제안한 변질지수를 이용하였다. 고정밀 XRF, 휴대용 XRF, ICP-AES를 이용한 성분분석 결과를 기존 변질지수인AI (Alteration Index)와 CCPI (Chloirte-Carbonate-Pyrite Index)에 적용한 결과 분석기기에 따른 정확도 차이는 있으나 전체적인 경향은 유사했고, 고품위 석회암, 백운암, 견운모화 변질을 받은 암석 등을 구분할 수 있었다. 기존 변질지수는 스카른 광물 및 금속 광물을 분류하기에 어려움이 있어 본 연구에서는 AI에서 Fe 함량을 추가로 고려하는 스카른변질지수(SAI, Skarn Alteration Index)를 제안하였다. 이를 이용하여 석회암과 스카른을 정량적으로 구분하였고 향후 스카른 광상 탐사에서 유용하게 활용할 수 있을 것으로 기대한다. 또한, 변질지수 분석 시 휴대용 XRF가 측정할 수없는 Na의 영향을 평가한 결과 Na가 AI와 SAI의 결과값에 미치는 영향은 미미하였으며 이는 광역적 변질대 파악에있어 다수의 자료를 현장에서 확보할 수 있는 휴대용 XRF의 적용 가능성을 시사한다.
Abstract
This study applied alteration indexes to identify and quantitatively classify hydrothermally altered parts of limestones. Major elements in core samples from Gangwon Province, Korea, were measured using a portable X-ray fluorescence (XRF) analyzer, a benchtop XRF analyzer, and a inductively coupled plasma optical emission spectrometry, subsequently determining representative alteration indexes such as a alteration Index (AI), and a chloirte-carbonatepyrite index. As a result, the alteration indexes showed enough resolution to classify high quality limestones, dolomites, and sericitized rocks, even though each alteration index was not identical among the different instrumental methods. Because the alteration indexes suggested by previous studies were ineffective in classifying skarns, this study newly defined a skarn alteration index (SAI) for quantitatively identifying limestones and skarns. Sodium indetectable to a portable XRF analyzer seems to be less critical to AI and SAI, which suggests that the indexes can be easily measured at fields using a portable XRF analyzer.
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