Journal ArticleDOI
Authigenic Carbonate and the History of the Global Carbon Cycle
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TLDR
This work proposes that authigenic carbonate, produced in sediment pore fluids during early diagenesis, has played a major role in the carbon cycle in the past and presents a framework for interpreting the carbon isotopic composition of sedimentary rocks.Abstract:
We present a framework for interpreting the carbon isotopic composition of sedimentary rocks, which in turn requires a fundamental reinterpretation of the carbon cycle and redox budgets over Earth's history. We propose that authigenic carbonate, produced in sediment pore fluids during early diagenesis, has played a major role in the carbon cycle in the past. This sink constitutes a minor component of the carbon isotope mass balance under the modern, high levels of atmospheric oxygen but was much larger in times of low atmospheric O(2) or widespread marine anoxia. Waxing and waning of a global authigenic carbonate sink helps to explain extreme carbon isotope variations in the Proterozoic, Paleozoic, and Triassic.read more
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Journal ArticleDOI
Chemostratigraphy of the Shaler Supergroup, Victoria Island, NW Canada: A record of ocean composition prior to the Cryogenian glaciations
Danielle Thomson,Robert H. Rainbird,Noah J. Planavsky,Noah J. Planavsky,Timothy W. Lyons,Andrey Bekker +5 more
TL;DR: In this article, a new 13 Ccarb curve combined with 13 Corg values is presented for the upper Shaler Supergroup (∼900 to ∼720 Ma), Amundsen Basin, northwestern Canada.
Journal ArticleDOI
Modeling pN2 through Geological Time: Implications for Planetary Climates and Atmospheric Biosignatures.
Eva E. Stüeken,Michael A. Kipp,Matthew C. Koehler,Edward W. Schwieterman,Benjamin W. Johnson,Roger Buick +5 more
TL;DR: The results support the idea that an exoplanetary atmosphere rich in both N2 and O2 is a signature of an oxygen-producing biosphere and suggest that life appears to be necessary for significant atmospheric pN2 swings on Earth-like planets.
Journal ArticleDOI
Testing Urey's carbonate–silicate cycle using the calcium isotopic composition of sedimentary carbonates
TL;DR: In this article, the authors present >500 stable isotope ratios of calcium in Precambrian carbonate sediments, both limestones and dolomites, in an attempt to characterize the isotope mass balance of the sedimentary carbonate reservoir through time.
Journal ArticleDOI
Atmospheric oxygenation driven by unsteady growth of the continental sedimentary reservoir
Jon M. Husson,Shanan E. Peters +1 more
TL;DR: A forward model based on the empirical record of net organic carbon burial and oxidative weathering of the crust predicts two significant rises in atmospheric oxygen concentration separated by three comparatively stable plateaus, a pattern that reproduces major biological transitions and proxy-based pO2 records as mentioned in this paper.
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A pulse of oxygen increase in the early Mesoproterozoic ocean at ca. 1.57–1.56 Ga
TL;DR: The relationship between oxygen and evolution of early eukaryotes including algae and primitive animals in geological history has been debated, partly due to the varying estimates of oxygen levels in the mid-Proterozoic (ca. 1.8-0.8 Ga) ocean and atmosphere as discussed by the authors.
References
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TL;DR: PfPMP1)与感染红细胞、树突状组胞以及胎盘的单个或多个受体作用,在黏附及免疫逃避中起关键的作�ly.
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Geochim. cosmochim. acta
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Toward a Neoproterozoic composite carbon-isotope record
TL;DR: In this paper, a correlation scheme for the Neoproterozoic that corroborates radiometric data that indicate that there were three glacial epochs between ca. 750 and 580 Ma was proposed.
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Large Perturbations of the Carbon Cycle During Recovery from the End-Permian Extinction
Jonathan L. Payne,Daniel J. Lehrmann,Jiayong Wei,Michael J. Orchard,Daniel P. Schrag,Andrew H. Knoll +5 more
TL;DR: High-resolution carbon isotope measurements of multiple stratigraphic sections in south China demonstrate that the pronounced carbon isotopic excursion at the Permian-Triassic boundary was not an isolated event but the first in a series of large fluctuations that continued throughout the Early Triassic before ending abruptly early in the Middle Triassic.
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The abundance of 13c in marine organic matter and isotopic fractionation in the global biogeochemical cycle of carbon during the past 800 ma
TL;DR: For the later Neoproterozoic, from 800 to 543 Ma (346 analyses), from the Cambrian through the Jurassic (1616 analyses), and from the Cretaceous and Cenozoic (2493 analyses) the abundance of 13 C in marine organic matter has been compiled as discussed by the authors.