New perspectives in sulfur-iron cycling at the ocean- seafloor interface: The Black Sea sediments and deep-sea hydrothermal vents
Başlık çevirisi mevcut değil.
- Tez No: 400002
- Danışmanlar: PROF. DR. GEORGE W. LUTHER III
- Tez Türü: Doktora
- Konular: Deniz Bilimleri, Marine Science
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 2009
- Dil: İngilizce
- Üniversite: University of Delaware
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Belirtilmemiş.
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: 202
Özet
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Özet (Çeviri)
Speciation of sulfur and iron was investigated in the solid phase Black Sea sediments and high-temperature hydrothermal vent fluids of the 9°50?N East Pacific Rise and Lau Basin.Other than pyrite, solid phase sulfur in the upper Black Sea sediments existed as inorganic S(0) and acid-volatile sulfides (predominantly FeS) in the anoxic basin turbidites, and organic sulfur as humic sulfur in the uppermost 0-2 cm of the central basin sediments and as organic polysulfides in the sediments underlying suboxic waters. A 20 cm-thick turbidite in the surface of the western central basin was present as a result of a turbidity current triggered after the 1999 earthquakes in Northwestern Turkey, which transported reactive iron(III) and manganese(III, IV) oxides from southwestern shelf and slope sediments to the deep basin, oxidizing porewater sulfide to S(0).A mathematical model was designed to simulate the temporal changes in the Fe-S chemistry in the turbidite layer, and successfully showed that S(0) and solid phase reactive iron were still in the sediment long (5-8 years) after deposition of the turbidite. The turbidite-containing sediment column can serve as a sink for porewater sulfide for about 10 years. The results show that turbidites were a previously unrecognized sink for sulfide in the Black Sea and can account for 14% of the annual burial of sulfur.In addition to dissolved H2S/FeS, the hydrothermal vent sites had significant concentrations of dissolved (300°C vents, dissolved CRS is mostly made up of pyrite nanoparticles, which can constitute up to 10% of dissolved iron emanating from vents. At ambient seawater conditions, pyrite-Fe is oxidized slower than Fe2+ and FeS, thereby increasing the probability of Fe to be transported long distances into the deep ocean.
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