Document Detail

Widespread iron-rich conditions in the mid-Proterozoic ocean.
MedLine Citation:
PMID:  21900895     Owner:  NLM     Status:  Publisher    
The chemical composition of the ocean changed markedly with the oxidation of the Earth's surface, and this process has profoundly influenced the evolutionary and ecological history of life. The early Earth was characterized by a reducing ocean-atmosphere system, whereas the Phanerozoic eon (less than 542 million years ago) is known for a stable and oxygenated biosphere conducive to the radiation of animals. The redox characteristics of surface environments during Earth's middle age (1.8-1 billion years ago) are less well known, but it is generally assumed that the mid-Proterozoic was home to a globally sulphidic (euxinic) deep ocean. Here we present iron data from a suite of mid-Proterozoic marine mudstones. Contrary to the popular model, our results indicate that ferruginous (anoxic and Fe(2+)-rich) conditions were both spatially and temporally extensive across diverse palaeogeographic settings in the mid-Proterozoic ocean, inviting new models for the temporal distribution of iron formations and the availability of bioessential trace elements during a critical window for eukaryotic evolution.
Noah J Planavsky; Peter McGoldrick; Clinton T Scott; Chao Li; Christopher T Reinhard; Amy E Kelly; Xuelei Chu; Andrey Bekker; Gordon D Love; Timothy W Lyons
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-9-07
Journal Detail:
Title:  Nature     Volume:  -     ISSN:  1476-4687     ISO Abbreviation:  -     Publication Date:  2011 Sep 
Date Detail:
Created Date:  2011-9-8     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0410462     Medline TA:  Nature     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Department of Earth Sciences, University of California, Riverside, California 92521, USA.
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