Search Results - "Penny, Amelia M."

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    Uranium isotope evidence for an expansion of anoxia in terminal Ediacaran oceans by Tostevin, Rosalie, Clarkson, Matthew O., Gangl, Sophie, Shields, Graham A., Wood, Rachel A., Bowyer, Fred, Penny, Amelia M., Stirling, Claudine H.

    Published in Earth and planetary science letters (15-01-2019)
    “…Anoxic and iron-rich oceanic conditions prevailed throughout most of the Archean and Proterozoic (4000 to c.540 million years ago, Ma), but the oceans are…”
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    Journal Article
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    Constraints on the late Ediacaran sulfur cycle from carbonate associated sulfate by Tostevin, Rosalie, He, Tianchen, Turchyn, Alexandra V., Wood, Rachel A., Penny, Amelia M., Bowyer, Fred, Antler, Gilad, Shields, Graham A.

    Published in Precambrian research (01-03-2017)
    “…•Inadequate pre-leaching procedures can affect average δ34SCAS by up to 12‰.•Enigmatic ‘superheavy’ pyrite may not be as prevalent as previously…”
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    Calcium isotopes as a record of the marine calcium cycle versus carbonate diagenesis during the late Ediacaran by Tostevin, Rosalie, Bradbury, Harold J., Shields, Graham A., Wood, Rachel A., Bowyer, Fred, Penny, Amelia M., Turchyn, Alexandra V.

    Published in Chemical geology (20-12-2019)
    “…•δ44Ca from limestones aged ∼550–539 Ma that host the earliest skeletal animal fossils.•Negative shift in δ44Ca that lasted at least 11–14Myrs.•Unlikely to…”
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    Journal Article