[논문]설악산 토양 내 황사의 퇴적과 풍화

정기영

doi:10.22807/kjmp.2021.34.4.255

설악산 토양 내 황사의 퇴적과 풍화
Dust Deposition and Weathering in Soils of Seoraksan 원문보기

광물과 암석 = Korean journal of mineralogy and petrology, v.34 no.4, 2021년, pp.255 - 264

초록
AI-Helper

한반도는 황사의 이동 경로에 있으나, 풍화와 침식이 활발한 산악 지형에서 황사의 퇴적을 확인하기는 어렵다. 이 연구에서는 설악산 알칼리장석화강암 토양의 세립실트(< 20 ㎛)에 점토광물 특성, 광물조성, 미세조직 분석을 실시하여 산악지역 토양 내 황사퇴적물의 존재 상태를 조사하였다. 이 지역 토양 세립실트는 기반암 유래 쇄설성 입자, 황사퇴적물, 그리고 이들의 풍화물로 구성되어 있다. 토양 내 황사기원 광물로 2:1 층상규산염, 녹니석, 각섬석, 녹염석, 함칼슘사장석이 확인되었다. 기반암인 알칼리장석화강암은 석영과 알칼리장석으로 구성되며, 알칼리장석 중 앨바이트가 부분적으로 풍화되어 소량의 깁사이트와 고령토 광물이 생성되었다. 산성토양환경에서 일라이트-스멕타이트 계열 2:1 층상규산염의 팽윤성 층간에 다핵 Al 양이온 종들이 교환 및 고정되어 히드록시-Al삽입점토광물이 생성되었다. 2:1 층상규산염 총량을 기준으로 평가하면 조사한 토양 세립실트 내 황사의 양은 70% 정도로 추정된다.

Abstract ▼ AI-Helper

Asian dust (Hwangsa) deposited on the surface of the Korean Peninsula is difficult to recognize their existence in mountainous terrain undergoing active erosion and weathering. This study examined Asian dust sediments mixed in soils by analysing clay mineralogy, mineral composition, and microtextures of fine silt (< 20 ㎛) in the alkali feldspar granite area of Seoraksan. The fine silt was composed of detrital particles derived from bedrocks, Asian dust sediments, and their weathering products. Clay minerals of 2:1 structural type, chlorite, amphibole, epidote, and Ca-bearing plagioclase were identified as eolian mineral particles. During the weathering of the bedrock composed of quartz and alkali feldspars, albite was partially weathered to produce small amounts of gibbsite and kaolin minerals. Hydroxy-Al interlayered clay minerals were formed by the exchange and fixation of polynuclear Al cationic species into the interlayers of expandable 2:1 clay minerals dominated by illite-smectite series clay minerals. Contribution of Asian dust to the fine silt of soils was estimated around 70% on the basis of total contents of 2:1 phyllosilicates.

주제어

표/그림 (5)

그림 Fig. 1. Geological map of Seoraksan area (Kee et al., 2010; Kim et al., 2010; Song et al., 2011) and sampling sites (white diamonds with number).
표 Table 1. Mineral compositions of fine silts (< 20 μm) in soils from Seoraksan
$Fig. 2. X-ray diffraction patterns of clay fractions of soils developed on Seoraksan granite. Oriented mounts. XRD analysis was not done for sample SaGr 13 at 500℃ because clay film was peeled from the substrate with heating. Ch: chlorite, Gb: gibbsite, HICM: hyxdroxy-Al interlayered clay minerals, Ilt: illite, Ka: kaolinite, Pl: plagioclase, Q: quartz.$ 그림 Fig. 2. X-ray diffraction patterns of clay fractions of soils developed on Seoraksan granite. Oriented mounts. XRD analysis was not done for sample SaGr 13 at 500℃ because clay film was peeled from the substrate with heating. Ch: chlorite, Gb: gibbsite, HICM: hyxdroxy-Al interlayered clay minerals, Ilt: illite, Ka: kaolinite, Pl: plagioclase, Q: quartz.
그림 Fig. 3. Scanning electron microscope back-scattered electron images of thin sections of Seoraksan granite (a, b) and weathered Seoraksan granite (c, d, e, f). Ab: albite, B: iron-rich biotite, Gb: gibbsite, Ka: kaolinite, Mu: muscovite, Or: orthoclase, Pe: perthite of orthoclase and albite, Q: quartz. Black area in BSE images is pore.
그림 Fig. 4. Scanning electron microscope back-scattered electron images of soil thin sections (a, b, c, and d) and energy disperse X-ray spectra of fine clay (e) and clay particle in Asian dust (Hwangsa) (f). Ab: albite, B: iron-rich biotite, Ch: chlorite, E: epidote, Gb: gibbsite, Ka: kaolinite, Ka-B: iron-rich biotite weathering to kaolinite, Kf: K-feldspar, M: muscovite, Pl: calcic plagioclase, Q: quartz, Ti: Ti oxide. Black area in BSE images is pore.

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