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http://dx.doi.org/10.22807/KJMP.2021.34.4.255

Dust Deposition and Weathering in Soils of Seoraksan  

Jeong, Gi Young (Department of Earth and Environmental Sciences, Andong National University)
Publication Information
Korean Journal of Mineralogy and Petrology / v.34, no.4, 2021 , pp. 255-264 More about this Journal
Abstract
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.
Keywords
Seoraksan; Granite; Asian dust; Hwangsa; Soil; Clay minerals;
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