The Role of Reactive Phosphorus Generation in Cretaceous Anoxic Events

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Presentation transcript:

The Role of Reactive Phosphorus Generation in Cretaceous Anoxic Events Kristina L. Faul, Chemistry Department, Mills College, Oakland, CA 94613 High oceanic productivity and ocean anoxia are often cited as causes of high organic carbon burial during Cretaceous Oceanic Anoxic Events (OAEs) My goal is to test whether phosphorus is preferentially regenerated from OAE sediments, and the role phosphorus generation might play in fueling these high productivity events. Sites Sampled: DSDP Site 79, Eastern North Atlantic Blake Nose, western North Atlantic Demerera Rise, equatorial Atlantic Shatsky Rise, equatorial Pacific Preliminary Data: Cretaceous Blake Nose C to P Ratios Ground-Truthing: Modern High Organic P Sediments From Coastal California We are comparing modern oceanic C to P ratios in high P sedimentation regimes (e.g., Tomales Bay, CA) with paleo-data. Organic C data will be generated for these high P concentration sediments (at left). Understanding the process of P cycling in modern sediments will help us interpret paleo-data. Blake Nose has Cretaceous age organic C to reactive P ratios (at left), that are lower than modern open ocean organic C to reactive P ratios, possibly indicating preferential regeneration of reactive P during Cretaceous anoxic events.