globalchange  > 气候减缓与适应
DOI: 10.1007/s10533-017-0346-5
Scopus记录号: 2-s2.0-85019710378
论文题名:
Iron cycling in the anoxic cryo-ecosystem of Antarctic Lake Vida
作者: Proemse B.C.; Murray A.E.; Schallenberg C.; McKiernan B.; Glazer B.T.; Young S.A.; Ostrom N.E.; Bowie A.R.; Wieser M.E.; Kenig F.; Doran P.T.; Edwards R.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2017
卷: 134, 期:2018-01-02
起始页码: 17
结束页码: 27
语种: 英语
英文关键词: Iron ; Lake Vida ; McMurdo dry valleys ; Redox
英文摘要: Iron redox cycling in metal-rich, hypersaline, anoxic brines plays a central role in the biogeochemical evolution of life on Earth, and similar brines with the potential to harbor life are thought to exist elsewhere in the solar system. To investigate iron biogeochemical cycling in a terrestrial analog we determined the iron redox chemistry and isotopic signatures in the cryoencapsulated liquid brines found in frozen Lake Vida, East Antarctica. We used both in situ voltammetry and the spectrophotometric ferrozine method to determine iron speciation in Lake Vida brine (LVBr). Our results show that iron speciation in the anoxic LVBr was, unexpectedly, not free Fe(II). Iron isotope analysis revealed highly depleted values of −2.5‰ for the ferric iron of LVBr that are similar to iron isotopic signatures of Fe(II) produced by dissimilatory iron reduction. The presence of Fe(III) in LVBr therefore indicates dynamic iron redox cycling beyond iron reduction. Furthermore, extremely low δ18O–SO4 2− values (−9.7‰) support microbial iron-sulfur cycling reactions. In combination with evidence for chemodenitrification resulting in iron oxidation, we conclude that coupled abiotic and biotic redox reactions are driving the iron cycle in Lake Vida brine. Our findings challenge the current state of knowledge of anoxic brine chemistry and may serve as an analogue for icy brines found in the outer reaches of the solar system. © 2017, Springer International Publishing Switzerland.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83267
Appears in Collections:气候减缓与适应
气候变化事实与影响

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作者单位: School of Biological Sciences, University of Tasmania, Private Bag 55, Hobart, TAS, Australia; Division of Earth and Ecosystem Sciences, Desert Research Institute, 2215 Raggio Parkway, Reno, NV, United States; School of Earth and Ocean Sciences, University of Victoria, PO Box 1700 Stn CSC, Victoria, BC, Canada; Antarctic Climate and Ecosystems CRC, and Institute for Marine and Antarctic Studies, University of Tasmania, Private Bag 80, Hobart, TAS, Australia; Department of Physics and Astronomy, University of Calgary, 2500 University Drive NW, Calgary, AB, Canada; Department of Oceanography, University of Hawaii, 1000 Pope Rd, Honolulu, HI, United States; Department of Earth, Ocean, and Atmospheric Science, Florida State University, Tallahassee, FL, United States; Department of Integrative Biology and DOE Great Lakes Bioenergy Research Center, Michigan State University, 288 Farm Lane, East Lansing, MI, United States; Department of Earth and Environmental Sciences, University of Illinois at Chicago, 845 West Taylor Street, Chicago, IL, United States; Department of Geology and Geophysics, Louisiana State University, E235 Howe Russell Geosciences Complex, Baton Rouge, LA, United States; Physics and Astronomy, Curtin University, Kent St, Bentley, WA, Australia

Recommended Citation:
Proemse B.C.,Murray A.E.,Schallenberg C.,et al. Iron cycling in the anoxic cryo-ecosystem of Antarctic Lake Vida[J]. Biogeochemistry,2017-01-01,134(2018-01-02)
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