Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1038/s41561-017-0036-x |
Isotopic evidence for oxygenated Mesoarchaean shallow oceans | |
Eickmann, Benjamin1,2; Hofmann, Axel1; Wille, Martin2,5; Bui, Thi Hao3; Wing, Boswell A.3,4; Schoenberg, Ronny2 | |
2018-02-01 | |
发表期刊 | NATURE GEOSCIENCE |
ISSN | 1752-0894 |
EISSN | 1752-0908 |
出版年 | 2018 |
卷号 | 11期号:2页码:133-+ |
文章类型 | Article |
语种 | 英语 |
国家 | South Africa; Germany; Canada; USA; Switzerland |
英文摘要 | Mass-independent fractionation of sulfur isotopes (MIF-S) in Archaean sediments results from photochemical processing of atmospheric sulfur species in an oxygen-depleted atmosphere. Geological preservation of MIF-S provides evidence for microbial sulfate reduction (MSR) in low-sulfate Paleoarchaean (3.8-3.2 billion years ago (Ga)) and Neoarchaean (2.8-2.5 Ga) oceans, but the significance of MSR in Mesoarchaean (3.2-2.8 Ga) oceans is less clear. Here we present multiple sulfur and iron isotope data of early diagenetic pyrites from 2.97-Gyr-old stromatolitic dolomites deposited in a tidal flat environment of the Nsuze Group, Pongola Supergroup, South Africa. We identified consistently negative Delta S-33 values in pyrite, which indicates photochemical reactions under anoxic atmospheric conditions, but large mass-dependent sulfur isotope fractionations of similar to 30 parts per thousand in delta S-34, identifying active MSR. Negative pyrite delta Fe-56 values (-1.31 to -0.88 parts per thousand) record Fe oxidation in oxygen-bearing shallow oceans coupled with biogenic Fe reduction during diagenesis, consistent with the onset of local Fe cycling in oxygen oases similar to 3.0 Ga. We therefore suggest the presence of oxygenated near-shore shallow-marine environments with >= 5 mu M sulfate at this time, in spite of the clear presence of an overall reduced Mesoarchaean atmosphere. |
领域 | 地球科学 ; 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000423843600012 |
WOS关键词 | THERMOCHEMICAL SULFATE REDUCTION ; SOUTH-AFRICA ; PONGOLA SUPERGROUP ; MULTIPLE-SULFUR ; WITWATERSRAND SUPERGROUP ; ARCHEAN OCEAN ; IRON ISOTOPES ; SEDIMENTARY-ROCKS ; KAAPVAAL CRATON ; MOZAAN GROUP |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
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/34688 |
专题 | 地球科学 气候变化 |
作者单位 | 1.Univ Johannesburg, Dept Geol, Johannesburg, South Africa; 2.Univ Tubingen, Dept Geosci, Tubingen, Germany; 3.McGill Univ, Dept Earth & Planetary Sci, Montreal, PQ, Canada; 4.Univ Colorado, Dept Geol Sci, Boulder, CO 80309 USA; 5.Univ Bern, Inst Geol Sci, Bern, Switzerland |
推荐引用方式 GB/T 7714 | Eickmann, Benjamin,Hofmann, Axel,Wille, Martin,et al. Isotopic evidence for oxygenated Mesoarchaean shallow oceans[J]. NATURE GEOSCIENCE,2018,11(2):133-+. |
APA | Eickmann, Benjamin,Hofmann, Axel,Wille, Martin,Bui, Thi Hao,Wing, Boswell A.,&Schoenberg, Ronny.(2018).Isotopic evidence for oxygenated Mesoarchaean shallow oceans.NATURE GEOSCIENCE,11(2),133-+. |
MLA | Eickmann, Benjamin,et al."Isotopic evidence for oxygenated Mesoarchaean shallow oceans".NATURE GEOSCIENCE 11.2(2018):133-+. |
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