Search Results - "Poulton, S. W"

Tracing the stepwise oxygenation of the Proterozoic ocean by Scott, C, Lyons, T. W, Bekker, A, Shen, Y, Poulton, S. W, Chu, X, Anbar, A. D

“…Biogeochemical signatures preserved in ancient sedimentary rocks provide clues to the nature and timing of the oxygenation of the Earth's atmosphere…”
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Ocean acidification and the Permo-Triassic mass extinction by Clarkson, M. O., Kasemann, S. A., Wood, R. A., Lenton, T. M., Daines, S. J., Richoz, S., Ohnemueller, F., Meixner, A., Poulton, S. W., Tipper, E. T.

“…Ocean acidification triggered by Siberian Trap volcanism was a possible kill mechanism for the Permo-Triassic Boundary mass extinction, but direct evidence for…”
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Controls on the evolution of Ediacaran metazoan ecosystems: A redox perspective by Bowyer, F., Wood, R. A., Poulton, S. W.

“…A growing number of detailed geochemical studies of Ediacaran (635–541 Ma) marine successions have provided snapshots into the redox environments that played…”
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Dynamic anoxic ferruginous conditions during the end-Permian mass extinction and recovery by Clarkson, M. O., Wood, R. A., Poulton, S. W., Richoz, S., Newton, R. J., Kasemann, S. A., Bowyer, F., Krystyn, L.

“…The end-Permian mass extinction, ∼252 million years ago, is notable for a complex recovery period of ∼5 Myr. Widespread euxinic (anoxic and sulfidic) oceanic…”
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Low-oxygen waters limited habitable space for early animals by Tostevin, R., Wood, R. A., Shields, G. A., Poulton, S. W., Guilbaud, R., Bowyer, F., Penny, A. M., He, T., Curtis, A., Hoffmann, K. H., Clarkson, M. O.

“…The oceans at the start of the Neoproterozoic Era (1,000–541 million years ago, Ma) were dominantly anoxic, but may have become progressively oxygenated,…”
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Sedimentary phosphorus and iron cycling in and below the oxygen minimum zone of the northern Arabian Sea by Kraal, P, Slomp, C. P, Reed, D. C, Reichart, G.-J, Poulton, S. W

“…In this study, we investigate phosphorus (P) and iron (Fe) cycling in sediments along a depth transect from within to well below the oxygen minimum zone (OMZ)…”
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Assessing the utility of Fe/Al and Fe-speciation to record water column redox conditions in carbonate-rich sediments by Clarkson, M.O., Poulton, S.W., Guilbaud, R., Wood, R.A.

“…Geochemical proxies based on Fe abundance (Fe/Al) and Fe-speciation have been widely applied to marine sediments in order to unravel paleo-depositional redox…”
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Late Ediacaran redox stability and metazoan evolution by Johnston, D.T., Poulton, S.W., Goldberg, T., Sergeev, V.N., Podkovyrov, V., Vorob'eva, N.G., Bekker, A., Knoll, A.H.

“…The Neoproterozoic arrival of animals fundamentally changed Earth's biological and geochemical trajectory. Since the early description of Ediacaran and…”
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Regional nutrient decrease drove redox stabilisation and metazoan diversification in the late Ediacaran Nama Group, Namibia by Bowyer, F. T., Shore, A. J., Wood, R. A., Alcott, L. J., Thomas, A. L., Butler, I. B., Curtis, A., Hainanan, S., Curtis-Walcott, S., Penny, A. M., Poulton, S. W.

“…The late Ediacaran witnessed an increase in metazoan diversity and ecological complexity, marking the inception of the Cambrian Explosion. To constrain the…”
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Redox sensitivity of P cycling during marine black shale formation: Dynamics of sulfidic and anoxic, non-sulfidic bottom waters by März, C., Poulton, S.W., Beckmann, B., Küster, K., Wagner, T., Kasten, S.

“…A high-resolution geochemical record of a 120 cm black shale interval deposited during the Coniacian–Santonian Oceanic Anoxic Event 3 (ODP Leg 207, Site 1261,…”
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Searching for an oxygenation event in the fossiliferous Ediacaran of northwestern Canada by Johnston, D.T., Poulton, S.W., Tosca, N.J., O'Brien, T., Halverson, G.P., Schrag, D.P., Macdonald, F.A.

“…Late Neoproterozoic (Ediacaran) strata from northwestern Canada provide a thick and rich sedimentological record, preserving intercalated carbonates and shale…”
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Phosphorus burial and diagenesis in the central Bering Sea (Bowers Ridge, IODP Site U1341): Perspectives on the marine P cycle by März, C., Poulton, S.W., Wagner, T., Schnetger, B., Brumsack, H.-J.

“…To reconstruct the cycling of reactive phosphorus (P) in the Bering Sea, a P speciation record covering the last ~4Ma was generated from sediments recovered…”
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Nitrogen cycle feedbacks as a control on euxinia in the mid-Proterozoic ocean by Boyle, R.A., Clark, J.R., Poulton, S.W., Shields-Zhou, G., Canfield, D.E., Lenton, T.M.

“…Geochemical evidence invokes anoxic deep oceans until the terminal Neoproterozoic ~0.55 Ma, despite oxygenation of Earth’s atmosphere nearly 2 Gyr earlier…”
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Solid phase associations, oceanic fluxes and the anthropogenic perturbation of transition metals in world river particulates by Poulton, Simon W, Raiswell, Robert

“…The solid phase associations of particulate Mn, Cu, Ni, Co, Cr and Zn in eight world rivers (representing 19% of the global sediment flux) have been determined…”
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Detection and removal of dissolved hydrogen sulphide in flow-through systems via the sulphidation of hydrous iron (III) oxides by Poulton, S. W., Krom, M. D., van Rijn, J., Raiswell, R., Bows, R.

“…A novel automated warning and removal system for hydrogen sulphide in aqueous flow-through systems has been developed based on the sulphidation of ferrihydrite…”
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Sulphur and oxygen isotope signatures of late Neoproterozoic to early Cambrian sulphate, Yangtze Platform, China: Diagenetic constraints and seawater evolution by Goldberg, Tatiana, Poulton, Simon W., Strauss, Harald

“…A wide range of sulphate sulphur isotope data has previously been reported for the late Neoproterozoic and early Cambrian (∼600 to 542 Ma), whereas hardly any…”
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The use of hydrous iron (III) oxides for the removal of hydrogen sulphide in aqueous systems by Poulton, Simon W., Krom, Michael D., Rijn, Jaap Van, Raiswell, Robert

“…The potential for iron (hydr)oxides to remove dissolved hydrogen sulphide from seawater has been examined under flow-through conditions. Ferrihydrite (a…”
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Porewater sulphur geochemistry and fossil preservation during phosphate diagenesis in a Lower Cretaceous shelf mudstone by Poulton, S W, Bottrell, SH, Underwood, C J

“…Lower Cretaceous mudstones exposed at Speeton in North Yorkshire, UK, contain lobsters and burrows preserved in diagenetic phosphate concretions. Isotopic…”
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Open system sulphate reduction in a diagenetic environment – Isotopic analysis of barite (δ34S and δ18O) and pyrite (δ34S) from the Tom and Jason Late Devonian Zn–Pb–Ba deposits, Selwyn Basin, Canada by Magnall, J.M., Gleeson, S.A., Stern, R.A., Newton, R.J., Poulton, S.W., Paradis, S.

“…Highly positive δ34S values in sulphide minerals are a common feature of shale hosted massive sulphide deposits (SHMS). Often this is attributed to near…”
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Large-scale fluctuations in Precambrian atmospheric and oceanic oxygen levels from the record of U in shales by Partin, C.A., Bekker, A., Planavsky, N.J., Scott, C.T., Gill, B.C., Li, C., Podkovyrov, V., Maslov, A., Konhauser, K.O., Lalonde, S.V., Love, G.D., Poulton, S.W., Lyons, T.W.

“…The atmosphere–ocean system experienced a progressive change from anoxic to more oxidizing conditions through time. This oxidation is traditionally envisaged…”
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