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DOI | 10.1073/pnas.1721733115 |
Mercury isotope signatures record photic zone euxinia in the Mesoproterozoic ocean | |
Zheng, Wang1; Gilleaudeaua, Geoffrey J.1,2; Kah, Linda C.3; Anbar, Ariel D.1,4 | |
2018-10-16 | |
发表期刊 | PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA |
ISSN | 0027-8424 |
出版年 | 2018 |
卷号 | 115期号:42页码:10594-10599 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
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 (similar to 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. |
英文关键词 | photic zone euxinia mercury stable isotopes Mesoproterozoic mass-independent fractionation |
领域 | 地球科学 ; 气候变化 ; 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000447491300041 |
WOS关键词 | MASS-INDEPENDENT FRACTIONATION ; DISSOLVED ELEMENTAL MERCURY ; NATURAL ORGANIC-MATTER ; ANOXIC ENVIRONMENTS ; ANAEROBIC-BACTERIA ; REDOX CONDITIONS ; MICROBIAL MATS ; TAOUDENI BASIN ; NORTH-ATLANTIC ; ATAR GROUP |
WOS类目 | Multidisciplinary Sciences |
WOS研究方向 | Science & Technology - Other Topics |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/204995 |
专题 | 地球科学 资源环境科学 气候变化 |
作者单位 | 1.Arizona State Univ, Sch Earth & Space Explorat, Tempe, AZ 85287 USA; 2.George Mason Univ, Dept Atmospher Ocean & Earth Sci, Fairfax, VA 22030 USA; 3.Univ Tennessee, Dept Earth & Planetary Sci, Knoxville, TN 37996 USA; 4.Arizona State Univ, Sch Mol Sci, Tempe, AZ 85287 USA |
推荐引用方式 GB/T 7714 | Zheng, Wang,Gilleaudeaua, Geoffrey J.,Kah, Linda 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,2018,115(42):10594-10599. |
APA | Zheng, Wang,Gilleaudeaua, Geoffrey J.,Kah, Linda C.,&Anbar, Ariel D..(2018).Mercury isotope signatures record photic zone euxinia in the Mesoproterozoic ocean.PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,115(42),10594-10599. |
MLA | Zheng, Wang,et al."Mercury isotope signatures record photic zone euxinia in the Mesoproterozoic ocean".PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 115.42(2018):10594-10599. |
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