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Element Dispersion and Wallrock Alteration Analysis Using Portable XRF and SWIR in the Samgwang Au Deposit
휴대용 XRF와 단파장적외선 분광분석을 이용한 삼광 금광상의 원소분산 및 모암변질 분석
Econ. Environ. Geol. 2019 Aug;52(4):259-74
Published online August 31, 2019;  https://doi.org/10.9719/EEG.2019.52.4.259
Copyright © 2019 the Korean society of economic and environmental gelology.

Junkyum Kim1, Dongbok Shin1,2*, Bongchul Yoo3, Heonkyung Im1 and Ilkyu Kim1
김준겸1 ·신동복1,2* ·유봉철3 ·임헌경1 ·김일규1

1Department of Geoenviromental Sciences, Kongju National University, Kongju 32588, Republic of Korea
2Yellow Sea Institute of Geoenvironmental Sciences, Kongju National University, Kongju 32588, Republic of Korea
3Convergence Research Center for Development of Mineral Resources, Korea Institute of Geoscience and Mineral Resources, Daejeon 34132, Republic of Korea
1공주대학교 지질환경과학과, 2황해지질환경연구소, 3한국지질자원연구원 DMR융합연구단
Received July 29, 2019; Revised August 27, 2019; Accepted August 28, 2019.
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
 Abstract
Using portable XRF and SWIR analyzer, the characteristics of element dispersion and wallrock alterations induced by interaction between hydrothermal fluids and host rocks were investigated and ore exploration factors were estimated for the orogenic-type Samgwang Au deposits. On this purpose, in-situ measurements were conducted for 804 spots at regular intervals with a total of 4,824 times for host rocks, consisting of schist and gneiss, and altered wallrocks contacted with quartz veins in the Bonhang adit of the deposit, and the results were compared with quantitative data obtained by XRF and ICP analysis. The regression coefficients are 0.88 for major elements and 0.56 for trace elements, excluding V. For polished rock slabs, better results came out for major elements, 0.97 and for trace elements, 0.65. In altered wallrocks contacted with quartz veins, elements such as Fe, Zn, and Rb exhibit positive correlations with As in concentrations, while V forms a negative trend. Contour maps demonstrate that As, Zn, Rb, Fe, Ti, Cr, and Ni are enriched together near quartz veins, showing similar elemental behaviors. In-situ analysis using portable SWIR analyzer represents that schist and gneiss contain mica, illite, chlorite, sericite, amphibole, and epidote, while illite, sericite, gypsum, and mica are present in the altered rocks contacted with quartz veins. In contour maps, chlorite occurs mostly in host rocks, while sericite is concentrated near quartz veins. These results are similar to those of previous studies for element dispersion and hydrothermal alteration, and support the possibility for application of in-situ analysis on the exploration of orogenic gold deposit.
Keywords : portable X-ray fluorescence analysis, portable short-wavelength infrared spectrum analysis, element dispersion, wallrock alteration, Samgwang Au deposit

 

August 2019, 52 (4)