globalchange  > 气候变化与战略
DOI: 10.1073/pnas.1721733115
论文题名:
Mercury isotope signatures record photic zone euxinia in the Mesoproterozoic ocean
作者: Zheng W.; Gilleaudeau G.J.; Kah L.C.; Anbar A.D.
刊名: Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
出版年: 2018
卷: 115, 期:42
起始页码: 10594
结束页码: 10599
语种: 英语
英文关键词: Mass-independent fractionation ; Mercury ; Mesoproterozoic ; Photic zone euxinia ; Stable isotopes
英文摘要: Photic zone euxinia (PZE) is a condition where anoxic, H2S-rich waters occur in the photic zone (PZ). PZE has been invoked as an impediment to the evolution of complex life on early Earth and as a kill mechanism for Phanerozoic mass extinctions. Here, we investigate the potential application of mercury (Hg) stable isotopes in marine sedimentary rocks as a proxy for PZE by measuring Hg isotope compositions in late Mesoproterozoic (∼1.1 Ga) shales that have independent evidence of PZE during discrete intervals. Strikingly, a significantly negative shift of Hg mass-independent isotope fractionation (MIF) was observed during euxinic intervals, suggesting changes in Hg sources or transformations in oceans coincident with the development of PZE. We propose that the negative shift of Hg MIF was most likely caused by (i) photoreduction of Hg(II) complexed by reduced sulfur ligands in a sulfide-rich PZ, and (ii) enhanced sequestration of atmospheric Hg(0) to the sediments by thiols and sulfide that were enriched in the surface ocean as a result of PZE. This study thus demonstrates that Hg isotope compositions in ancient marine sedimentary rocks can be a promising proxy for PZE and therefore may provide valuable insights into changes in ocean chemistry and its impact on the evolution of life. © 2018 National Academy of Sciences. All rights reserved.
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/163653
Appears in Collections:气候变化与战略

Files in This Item:

There are no files associated with this item.


作者单位: Zheng, W., School of Earth and Space Exploration, Arizona State University, Tempe, AZ 85287, United States; Gilleaudeau, G.J., School of Earth and Space Exploration, Arizona State University, Tempe, AZ 85287, United States, Department of Atmospheric, Oceanic, and Earth Sciences, George Mason University, Fairfax, VA 22030, United States; Kah, L.C., Department of Earth and Planetary Sciences, University of Tennessee, Knoxville, TN 37996, United States; Anbar, A.D., School of Earth and Space Exploration, Arizona State University, Tempe, AZ 85287, United States, School of Molecular Sciences, Arizona State University, Tempe, AZ 85287, United States

Recommended Citation:
Zheng W.,Gilleaudeau G.J.,Kah L.C.,et al. Mercury isotope signatures record photic zone euxinia in the Mesoproterozoic ocean[J]. Proceedings of the National Academy of Sciences of the United States of America,2018-01-01,115(42)
Service
Recommend this item
Sava as my favorate item
Show this item's statistics
Export Endnote File
Google Scholar
Similar articles in Google Scholar
[Zheng W.]'s Articles
[Gilleaudeau G.J.]'s Articles
[Kah L.C.]'s Articles
百度学术
Similar articles in Baidu Scholar
[Zheng W.]'s Articles
[Gilleaudeau G.J.]'s Articles
[Kah L.C.]'s Articles
CSDL cross search
Similar articles in CSDL Cross Search
[Zheng W.]‘s Articles
[Gilleaudeau G.J.]‘s Articles
[Kah L.C.]‘s Articles
Related Copyright Policies
Null
收藏/分享
所有评论 (0)
暂无评论
 

Items in IR are protected by copyright, with all rights reserved, unless otherwise indicated.