Clay Mineralogy, Organic Carbon Burial, and Redox Evolution in Proterozoic Oceans
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منابع مشابه
Mineral surface control of organic carbon in black shale.
We show that 85% of variation in total organic carbon can be explained by mineral surface area in a black shale deposit from two locations in the late Cretaceous Western Interior Seaway, United States. This relation suggests that, as in modern marine sediments, adsorption of carbon compounds onto clay mineral surfaces played a fundamental role in the burial and preservation of organic carbon. O...
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Geochemical evidence suggests that there was a delay of several hundred million years between the evolution of oxygenic photosynthesis and the accumulation of oxygen in Earth’s atmosphere. The deep ocean appears to have remained euxenic for several hundred million years after the atmosphere became oxygenated. In this paper we examine the possibility that the extraordinary delay in the oxidation...
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Molecular oxygen (O(2)) began to accumulate in the atmosphere and surface ocean ca. 2,400 million years ago (Ma), but the persistent oxygenation of water masses throughout the oceans developed much later, perhaps beginning as recently as 580-550 Ma. For much of the intervening interval, moderately oxic surface waters lay above an oxygen minimum zone (OMZ) that tended toward euxinia (anoxic and ...
متن کاملClimatic evolution across oceanic anoxic event 1a derived from terrestrial palynology and clay minerals (Maestrat Basin, Spain)
Studies dealing with the response of the continental biosphere to the environmental perturbations associated with Cretaceous oceanic anoxic events (OAEs) are comparatively rare. Here, a quantitative spore-pollen record combined with clay mineral data is presented, which covers the entire early Aptian OAE 1a interval (Forcall Formation, Maestrat basin, east Spain). The well-expressed OAE 1a carb...
متن کاملUnderstanding the Evolution of Atmospheric Redox State from the Archaean to the Proterozoic
Introduction: Geological differences between the ancient and modern Earth show that there was too little O2 in the early atmosphere to leave traces of oxidation that today are common, such as the reddening of exposed iron-rich rocks [1]. The onset of oxidized paleosols, red beds, and the ensuing absence of detrital pyrite, siderite and uraninite all indicate an increase in atmospheric O2 levels...
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تاریخ انتشار 2009