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Geochemistry of soils of King George Island, South Shetlands,West Antarctica: Implications for pedogenesis in cold regions

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Title
Geochemistry of soils of King George Island, South Shetlands,West Antarctica: Implications for pedogenesis in cold regions
Other Titles
서남극 남쉐틀랜드 군도와 킹조지 섬의 토양의 조성: 극지방 에서의 토양화작용에 대한 의의
Authors
Lee, Yong Il
Yoon, Ho Il
Lim, Hyoun Soo
Keywords
Antarctica; Geochemistry; soils
Issue Date
2004
Citation
Lee, Yong Il, Yoon, Ho Il, Lim, Hyoun Soo. 2004. "Geochemistry of soils of King George Island, South Shetlands,West Antarctica: Implications for pedogenesis in cold regions". GEOCHIMICA ET COSMOCHIMICA ACTA, 68(14): 4319-4333.
Abstract
Fine fractions of soils on the Barton Peninsula, King George Island,West Antarctica have been forming during the last 6000 yr since the last deglaciation. Texturally, they are mostly composed of mineral and rock fragments with some volcanic ashes, which are also indicated by geochemical compositions representing for the nonclay silicate minerals and low values of chemical index of alteration. No significant changes are observed in major- and trace element abundances. Such geochemical characteristics suggest that chemical weathering of bedrocks on the Barton Peninsula seems insignificant and that the soils are composed of physically weathered mineral and rock fragments which are mixed with eolian additions of volcanic ashes and Patagonian dusts. Chondrite-normalized rare earth element (REE) distribution patterns of the Barton Peninsula soils are slightly different from those of bedrocrs, indicating that the REE abundances and characteristics were influenced by eolian additions. Mixing calculations, which mass-balance the REEs, suggest that volcanic ashes blown from Deception Island were the major eolian contributor, followed by atmospheric dusts sourced from Patagonia, South America. Even in the warmer and humid climatic conditions in the maritime Antarctic region, the chemical weathering of bedrocks appears to be insignificant, probably due to the relatively short duration of weathering since the last deglaciation.
URI
http://repository.kopri.re.kr/handle/201206/5944
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