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- W2072090936 abstract "Abstract Molybdenum is a bioessential micronutrient whose abundance in the global oceans may have played a primary role in evolution of the Earth's nitrogen cycle and, ultimately, in the timing of the ecologic expansion of early eukaryotes. Because molybdenum (Mo) is delivered to the ocean under conditions of oxic weathering and is removed in suboxic and euxinic environments, the concentration of Mo in the oceans reflects a complex function of global redox and the hydrologic conditions that influence the areal extent of euxinic sedimentation. Recent compilations of Mo within euxinic shales ( Scott et al., 2008 , Och and Shields-Zhou, 2012 , Sahoo et al., 2012 ) indicate that the oceanic reservoir of Mo did not rise substantially above crustal values until the Great Oxidation Event (~ 2.3 Ga), and a modern Mo cycle did not develop until the contraction of ocean euxinia in the latest Proterozoic. At present, a paucity of data from euxinic shales of the late Mesoproterozoic (1.3 to 1.0 Ga) limits our ability to relate marine redox evolution to biological innovation during a critical interval of eukaryotic development. Here we present data from marine shales of the 1.1 Ga Atar and El Mreiti groups, Mauritania, which were deposited during sea level highstand when shallow, epeiric seas covered much of the West African craton. Epicratonic strata of the El Mreiti Group were deposited under fluctuating redox conditions near a shallow chemocline (as evidenced by iron speciation), and record generally low Mo concentrations (" @default.
- W2072090936 created "2016-06-24" @default.
- W2072090936 creator A5039534526 @default.
- W2072090936 creator A5082358047 @default.
- W2072090936 date "2013-10-01" @default.
- W2072090936 modified "2023-09-23" @default.
- W2072090936 title "Oceanic molybdenum drawdown by epeiric sea expansion in the Mesoproterozoic" @default.
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