Gypsum crystals observed in experimental and natural sea ice

Autor:	Nicolas-Xavier Geilfus, D.H. Søgaard, Søren Rysgaard, Norman M. Halden, M. Cooper, Feiyue Wang, A.A. Hare, Ryan J. Galley
Rok vydání:	2013
Předmět:	geography geography.geographical_feature_category Gypsum Precipitation (chemistry) Mineralogy Authigenic engineering.material Natural (archaeology) Ikaite Geophysics Polar seas Sea ice engineering General Earth and Planetary Sciences Deposition (chemistry) Geology
Zdroj:	Geophysical Research Letters. 40:6362-6367
ISSN:	0094-8276
DOI:	10.1002/2013gl058479
Popis:	[1] Although gypsum has been predicted to precipitate in sea ice, it has never been observed. Here we provide the first report on gypsum precipitation in both experimental and natural sea ice. Crystals were identified by X-ray diffraction analysis. Based on their apparent distinguishing characteristics, the gypsum crystals were identified as being authigenic. The FREeZing CHEMistry (FREZCHEM) model results support our observations of both gypsum and ikaite precipitation at typical in situ sea ice temperatures and confirms the “Gitterman pathway” where gypsum is predicted to precipitate. The occurrence of authigenic gypsum in sea ice during its formation represents a new observation of precipitate formation and potential marine deposition in polar seas.
Databáze:	OpenAIRE
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