A molybdenum-isotope perspective on Phanerozoic deoxygenation events
نویسندگان
چکیده
منابع مشابه
Mantle plumes link magnetic superchrons to phanerozoic mass depletion events
The four most recent large mass extinction events in the Phanerozoic – the Cretaceous–Tertiary (KT), the Triassic–Jurassic (TJ), and the Permo-Triassic (PT) and Guadalupian–Tatarian (GT) doublet – are associated with a major flood basalt eruption, with the timing of peak volcanic activity corresponding within measurement uncertainties to the extinction event. Three magnetic superchrons precede ...
متن کاملInfluence of sulfate reduction rates on the Phanerozoic sulfur isotope record.
Phanerozoic levels of atmospheric oxygen relate to the burial histories of organic carbon and pyrite sulfur. The sulfur cycle remains poorly constrained, however, leading to concomitant uncertainties in O2 budgets. Here we present experiments linking the magnitude of fractionations of the multiple sulfur isotopes to the rate of microbial sulfate reduction. The data demonstrate that such fractio...
متن کاملA lead isotope perspective on urban development in ancient Naples.
The influence of a sophisticated water distribution system on urban development in Roman times is tested against the impact of Vesuvius volcanic activity, in particular the great eruption of AD 79, on all of the ancient cities of the Bay of Naples (Neapolis). Written accounts on urbanization outside of Rome are scarce and the archaeological record sketchy, especially during the tumultuous fifth...
متن کاملOceanic molybdenum isotope fractionation: Diagenesis and hydrothermal ridgeâ•’flank alteration
[1] Isotopic analyses of dissolved molybdenum are presented for sediment pore waters from a reducing sedimentary basin and for fluids from a low-temperature ridge flank hydrothermal system. dMo in these fluids range from 0.8 to 3.5% (relative to a laboratory standard), demonstrating that marine sedimentary reactions significantly fractionate Mo isotopes. Within the upper 3 cm of sediment, manga...
متن کاملSearch for Mass-independent Molybdenum Isotope Anomalies in Iron
Introduction: Primitive meteorites contain components such as presolar grains and some refractory inclusions that are isotopically different from the average solar system. These isotope anomalies are witness of an initial isotopic heterogeneity of the solar nebula. In spite of this initial isotopic heterogeneity, the isotope composition of larger planetary bodies in the solar system seems to be...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Nature Geoscience
سال: 2017
ISSN: 1752-0894,1752-0908
DOI: 10.1038/ngeo3028