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- W2214591772 abstract "Abstract Fullerene (C 60 ) have been reported in a number of geologic samples and, in some cases, attributed to carbonaceous materials delivered during bolide impact events. The extraction and detection of C 60 poses significant analytical challenges, and some studies have been called into question due to the possibility of C 60 forming in situ . Here, we extracted samples taken from the Permian–Triassic boundary section in Meishan, South China and the Cretaceous–Paleogene boundary exposed at Stevns Klint, Denmark, and analyzed the residues using a fast and reliable method for quantifying C 60 . Extraction of both whole rock and completely demineralized samples were completed under conditions that previously yielded C 60 as well as using an optimized approach based on recent literature reports. These extracts were analyzed using mass spectrometry with the soft-ionization techniques, atmospheric pressure chemical ionization (APCI) and electrospray ionization (ESI), which have not been shown to form fullerenes in-situ . In no case were we able to detect C 60 , nor could we corroborate previous reports of its occurrence in these sediments, thereby challenging the utility of fullerene as a proxy for bolide impacts or mass extinction events." @default.
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- W2214591772 date "2016-03-01" @default.
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- W2214591772 title "Non-detection of C60 fullerene at two mass extinction horizons" @default.
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- W2214591772 doi "https://doi.org/10.1016/j.gca.2015.12.017" @default.
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