Qing Ma*, Yaoqi Zhou*, Aubrey Zerkle and Mengchun Cao,
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Seawater Redox Conditions in the Late Paleoproterozoic: Insight from the North China Craton
The “Boring Billion” (BB, ∼1800–800 Ma) is characterized by the perceived stasis of carbon isotopes within the geological record of that time. However, geochemical data obtained from global Paleo-Mesoproterozoic strata indicate heterogeneity and complexity of oxygen contents in the oceans, which hinder paleoenvironmental reconstructions from this period. Furthermore, there has been a dearth of studies focused on the Paleoproterozoic strata in the western and southern parts of the North China Craton (NCC). In this paper, we report elemental abundances and Fe speciation data from the Huangqikou Formation in the Ordos Basin, western NCC, and the Dagushi, Bingmagou, Baicaoping, and Puyu Formations in the Xiong’er Basin, southern NCC. Our latest findings, integrated with prior research, indicate that sedimentary environments in these parts of the NCC in the late Paleoproterozoic were uniformly anoxic and ferruginous. During a marine transgression, we see limited evidence of oxic surface waters entering the sedimentary water and resulting in intermittent oxygenation events in the Ordos Basin. However, microbial respiration of oxygen and/or limited oxygen replenishment under sluggish circulation in the basin might have caused the consistently anoxic conditions in the Xiong’er Basin during the late Paleoproterozoic.
期刊介绍:
The scope of ACS Earth and Space Chemistry includes the application of analytical, experimental and theoretical chemistry to investigate research questions relevant to the Earth and Space. The journal encompasses the highly interdisciplinary nature of research in this area, while emphasizing chemistry and chemical research tools as the unifying theme. The journal publishes broadly in the domains of high- and low-temperature geochemistry, atmospheric chemistry, marine chemistry, planetary chemistry, astrochemistry, and analytical geochemistry. ACS Earth and Space Chemistry publishes Articles, Letters, Reviews, and Features to provide flexible formats to readily communicate all aspects of research in these fields.