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Showing 1 to 6 of 6 for “"ocean anoxia"”.

  1. Uranium Isotopes and Ocean Anoxia during Cretaceous Ocean Anoxic Event 2

    Kulenguski, Joseph

    gmu

  2. High-precision U/Pb geochronology of large igneous provinces and mass extinctions : testing coincidence and causation

    Burgess, Seth DouglasMassachusetts Institute of Technology2014

    … to rapid changes in global climate and/or ocean chemistry that are inferred to accompany the eruption of large igneous provinces (LIPs). Implicating LIP eruptions as the trigger of the biologic crises has relied on the approximate coincidence in time between these two events. To test this …

    mit Repository record

  3. Early evolution of environments and metabolism: insights from nitrogen, selenium and sulfur isotopes

    Stueeken, Eva Elisabeth2014

    … fluxes of sulfate and other nutrients to the ocean. In the third part (Chapters 4-7), I further test this hypothesis through analyses of selenium isotopes and abundances. After establishing a new analytical technique, I show that selenium was mobilized by oxidative weathering in the late …

    washington Repository record

  4. PCO2 EFFECTS ON THE PRODUCTION OF PELAGIC BIOGENIC CARBONATE AND OCEAN CHEMISTRY: A CASE HISTORY FROM THE CRETACEOUS.

    C. BottiniUniversità degli Studi di Milano2011

    In the early Aptian, ocean experienced a global phenomenon of widespread deposition of organic carbon-rich sediments under oxygen-poor conditions, named the Oceanic Anoxic Event 1a (OAE1a) (~120 Ma) which has its sedimentary expression in the Selli Level. OAE1a represents a profound perturbation of …

    milano Repository record

  5. Carbon cycle changes during the end-Marjuman (Cambrian) extinction in the Southern Appalachians

    Gerhardt, Angela MaeVirginia Tech2014

    The late Cambrian-early Ordovician transition contains several trilobite extinctions. The first of these extinctions (the end-Marjuman) is thought to coincide with the Steptoean Positive Carbon Isotope Excursion or SPICE, a large and rapid excursion in the marine carbon isotope record. This …

    vt Repository record

  6. Spatial heterogeneity in isotope and biomarker distributions : insights from the End-Devonian OAE in Western Canada.

    Dhar, Sanjukta, 1993-Baylor University.2025

    … column is periodically disrupted by surface ocean current divergence experience upwelling, where deep, nutrient-rich waters rise to the surface, supporting high primary productivity. This comprehensive study of carbon and nitrogen isotopic composition, biomarker distribution, and trace …

    baylor Repository record