期刊
GEODERMA
卷 347, 期 -, 页码 13-24出版社
ELSEVIER
DOI: 10.1016/j.geoderma.2019.03.024
关键词
Phosphatization; Plinthization; Sulfurization; Iron oxides
类别
资金
- CNPq (Conselho Nacional de Desenvolvimento Cientifico e Tecnologico)
- CAPES (Coordenacan de Aperfeicoamento de Pessoal de Nivel Superior)
- FAPEMIG (Fundacan de Amparo Pesquisa do Estado de Minas Gerais)
- INCT da Criosfera
- MARINHA DO BRASIL (PROANTAR PROGRAM)
- TERRANTAR
Although acid sulfate soils have been previously reported in Maritime Antarctica, no detailed study about the nature of the sulfide oxidation process and its effect on pedogenesis has been carried out to this day. The present study evaluate the soil genesis from Barton Peninsula along two toposequences developed under sulfides influence, emphasizing active chemical processes in a typical periglacial environment of Maritime Antarctica, and the unusual formation of petroplintite. Seven pedons were selected, described, sampled and classified according to the U.S. Soil Taxonomy and the IUSS Working Group WRB. Soil morphological, physical, chemical, microchemical and mineralogical properties were analyzed. The geochemical composition (total contents of Al, Ca, Co, Cu, Fe, K, Mg, Na, Ni, S, Si, Ti, Th, V and Zn) was determined with X-ray Fluorescence Spectrophotometer. Unlike previous studies that considered chemical weathering as insignificant in Barton Peninsula, this study demonstrates that some areas have active and pronounced chemical weathering processes (sulfurization and phosphatization), which cannot be underestimated. These chemical processes, together or individually, promote strong soil acidification, release exchangeable bases and accelerate mineralogical changes. Precipitation of secondary crystalline iron oxides, plinthization and petroplintite formation occur in these soils, resulting in unusual pedogenic features, unknown to occur in Antarctica to this day. Further studies on Antarctic soils with petroplinthic horizons, with or without ornithogenesis, deserve attention regarding micromorphological attributes and clarification about these new, unusual pedological processes in periglacial environments and their possible use as indicators of environmental change.
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