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Multiple oxygen (16O, 17O and 18O) and sulfur (32S, 33S, 34S and 36S) isotope signatures of the dissolved sulfate from Deception Island, Antarctic Peninsula: Implications on sulfate formation, transportation and deposition in the Antarctic region

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Title
Multiple oxygen (16O, 17O and 18O) and sulfur (32S, 33S, 34S and 36S) isotope signatures of the dissolved sulfate from Deception Island, Antarctic Peninsula: Implications on sulfate formation, transportation and deposition in the Antarctic region
Other Titles
남극 디셉션 섬 황화물의 산소/황 동위원소 연구: 남극에서 황화물의 생성, 이동, 농집에 대한 함의
Authors
Kim, Yeongmin
James Farquhar
Lee, Jong Ik
Seo, Jung Hun
Lee, Insung
Subject
Geochemistry & Geophysics
Keywords
Dissolved sulfate; Multiple oxygen/sulfur isotopes; Surface freshwater
Issue Date
2017
Citation
Kim, Yeongmin, et al. 2017. "Multiple oxygen (16O, 17O and 18O) and sulfur (32S, 33S, 34S and 36S) isotope signatures of the dissolved sulfate from Deception Island, Antarctic Peninsula: Implications on sulfate formation, transportation and deposition in the Antarctic region". CHEMICAL GEOLOGY, 466(1): 762-775.
Abstract
Oxygen (16O, 17O and 18O) and sulfur (32S, 33S, 34S and 36S) isotope ratios of and major ion (Na+, Ca2+, Cl?, NO3 ? and SO4 2?) concentrations in lakes, ponds and creeks from Deception Island, Antarctic Peninsula were analyzed to study the sources of sulfate, its oxidation, and the surficial processes of the dissolved sulfate. The positive relationship between the δ34Ssulfate (8.1‰to 17.3‰) and the Cl?/SO4 2? molar ratio suggests mixing of sulfate from atmospheric deposition and from oxidation of sulfide minerals. The average sea salt fraction (28%) and δ34Snss values (from 5.6‰ to 15.9‰) indicate that a combination of sea salt and marine biogenic sulfide provide the high δ34S end-member of the dissolved sulfates. The relatively low δ18Osulfate (from ?4.6‰ to 0.7‰) of Deception Island water suggests a role of local water in the formation of sulfate. Slightly negative but mass-dependent Δ17Osulfate values imply that atmospheric oxidation by O3 and H2O2 are negligible, while these values might suggest a significant role of oxidation by molecular oxygen and %OH. The distinctly low δ34Ssulfate value of two samples (DCW-2 and DCW-3) suggests the input of sulfate from sulfide oxidation. Slight elevation of δ34Ssulfate values up to 17.3‰compared to a typical atmospheric value indicates a minimal role for dissimilatory microbial sulfate reduction of Deception Island water and sediments. Both Δ33Ssulfate and Δ36Ssulfate values are homogeneous and near zero, implying that the dominant atmospheric oxidation process is tropospheric and that there are minimal to no contributions of stratospheric sulfate to Deception Island water.
URI
http://repository.kopri.re.kr/handle/201206/6236
DOI
http://dx.doi.org/10.1016/j.chemgeo.2017.07.029
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