NDLI: Constraints on the Archean atmospheric oxygen and sulfur cycle from mass-independent sulfur records from Anshan-Benxi BIFs, Liaoning Province, China

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Constraints on the Archean atmospheric oxygen and sulfur cycle from mass-independent sulfur records from Anshan-Benxi BIFs, Liaoning Province, China

Content Provider	Springer Nature Link
Author	Hou, KeJun Li, YanHe Wan, DeFang
Copyright Year	2007
Abstract	The Archean atmospheric oxygen concentration and sulfur cycle was long debated. The banded iron formation (BIF) is a special type of the sedimentary formation, which has truly recorded the atmospheric and oceanic conditions at that time. In this study, the composition of multiple sulfur isotope (δ $^{34}$S/δ $^{33}$S/δ $^{32}$S) for sulfides bedded in the Archean (∼2.7 Ga) BIFs, in Anshan-Benxi area of Liaoning Province has been measured. The value of Δ$^{33}$S varies from −0.89‰ to +1.21‰, which shows very obvious mass-independent fractionation (MIF) signatures. These non-zero Δ$^{33}$S values indicate that the Archean sulfur cycles are different from what it is today, which have been deeply influenced by gas phase photochemical reactions. Algoma-type BIFs which are closely related to the volcanic activity have negative Δ$^{33}$S value, however, Superior-type BIFs which are far away from the volcanic center have positive Δ$^{33}$S value. The δ $^{34}$S varies in a large range from −22.0‰ to +11.8‰, which indicates that the bacteria reduction activity has already existed at that time, and that the oceanic sulfate concentration has at least reached 1 mmol/L in local areas. Combined with the contemporaneous existence of the hematite, magnetite and the occurrence and preservation of the sulfur MIF, it can be inferred that the Archean atmospheric oxygen level must be at 10$^{−2}$–10$^{−3}$ of the present atmospheric level (PAL).
Starting Page	1471
Ending Page	1478
Page Count	8
File Format	PDF
ISSN	10069313
Journal	Science in China Series D: Earth Sciences
Volume Number	50
Issue Number	10
e-ISSN	18622801
Language	English
Publisher	Science in China Press
Publisher Date	2007-01-01
Publisher Place	Beijing
Access Restriction	Subscribed
Subject Keyword	sulfur mass-independent fractionation Anshan-Benxi area BIF Archean atmospheric oxygen level Archean sulfur cycle Geosciences
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences

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