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- Zhang, ShuichangChina National Petroleum Corporation (author)
Paleoenvironmental proxies and what the Xiamaling Formation tells us about the mid-Proterozoic ocean
- Article/chapterEnglish2019
Publisher, publication year, extent ...
- 2019-03-06
- Wiley,2019
Numbers
- LIBRIS-ID:oai:lup.lub.lu.se:cf9293e1-f327-410f-9fab-db4e78e0cacb
- https://lup.lub.lu.se/record/cf9293e1-f327-410f-9fab-db4e78e0cacbURI
- https://doi.org/10.1111/gbi.12337DOI
Supplementary language notes
- Language:English
- Summary in:English
Part of subdatabase
- SwePubSwePub
Classification
Notes
- The Mesoproterozoic Era (1,600–1,000 million years ago, Ma) geochemical record is sparse, but, nevertheless, critical in untangling relationships between the evolution of eukaryotic ecosystems and the evolution of Earth-surface chemistry. The ca. 1,400 Ma Xiamaling Formation has experienced only very low-grade thermal maturity and has emerged as a promising geochemical archive informing on the interplay between climate, ecosystem organization, and the chemistry of the atmosphere and oceans. Indeed, the geochemical record of portions of the Xiamaling Formation has been used to place minimum constraints on concentrations of atmospheric oxygen as well as possible influences of climate and climate change on water chemistry and sedimentation dynamics. A recent study has argued, however, that some portions of the Xiamaling Formation deposited in a highly restricted environment with only limited value as a geochemical archive. In this contribution, we fully explore these arguments as well as the underlying assumptions surrounding the use of many proxies used for paleo-environmental reconstructions. In doing so, we pay particular attention to deep-water oxygen-minimum zone environments and show that these generate unique geochemical signals that have been underappreciated. These signals, however, are compatible with the geochemical record of those parts of the Xiamaling Formation interpreted as most restricted. Overall, we conclude that the Xiamaling Formation was most likely open to the global ocean throughout its depositional history. More broadly, we show that proper paleo-environmental reconstructions require an understanding of the biogeochemical signals generated in all relevant modern analogue depositional environments. We also evaluate new data on the δ 98 Mo of Xiamaling Formation shales, revealing possible unknown pathways of molybdenum sequestration into sediments and concluding, finally, that seawater at that time likely had a δ 98 Mo value of about 1.1‰.
Subject headings and genre
- NATURVETENSKAP Geovetenskap och miljövetenskap Geokemi hsv//swe
- NATURAL SCIENCES Earth and Related Environmental Sciences Geochemistry hsv//eng
- climate
- evolution
- Mesoproterozoic
- molybdenum isotope
- oxygen
- oxygen minimum zone
- proxy
Added entries (persons, corporate bodies, meetings, titles ...)
- Wang, XiaomeiChina National Petroleum Corporation (author)
- Wang, HuajianChina National Petroleum Corporation (author)
- Bjerrum, Christian J.University of Copenhagen (author)
- Hammarlund, Emma U.Lund University,Lunds universitet,Avdelningen för translationell cancerforskning,Institutionen för laboratoriemedicin,Medicinska fakulteten,Division of Translational Cancer Research,Department of Laboratory Medicine,Faculty of Medicine,University of Southern Denmark(Swepub:lu)med-ehd (author)
- Haxen, Emma R.University of Copenhagen (author)
- Wen, HanjieInstitute of Geochemistry, Chinese Academy of Sciences (author)
- Ye, YuntaoChina National Petroleum Corporation (author)
- Canfield, Donald E.University of Southern Denmark,China National Petroleum Corporation (author)
- China National Petroleum CorporationUniversity of Copenhagen (creator_code:org_t)
Related titles
- In:Geobiology: Wiley17:3, s. 225-2461472-46771472-4669
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