Paired Calcium and Clumped Isotopes, Tools to Probe Changing Diagenetic Systems
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Overview
Syllabus
Intro
Talk layout: • Depositional setting: The Bahamian Margin Fluid-carbonate reactive exchange and its effects on geochemical records
Depositional Setting: Bahamian Margin • Platform margin sediment consists of re-deposited shallow marine sediments and pelagic material
Depositional Setting: Site 1003 ODP Site 1003 - Sampled on ODP Leg 166 in 1997
Shallow carbonate as a chemical archive? . Complicated - margin carbonate archives give conflicting, often contradictory geochemical signals to less complicated pelagic archives.
Fluid-sediment reactive exchange
The problem • Because sediments are progressively buried over time, recrystallizing sediments exchange with porefluids with different degrees of rock-buffering.
How to constrain reaction rate
Clumped isotopes: a one-slide primer
How to constrain recrystallization rate
Modeling variable reaction rate A single function for early and late diagenesis
How fast do fluids flow into margin?
A dataset for 84Ca on the Bahamian margin
Solving for advection rate
Fluid flow rates into the Bahamian margin
Correcting a 813C record for diagenesis
What can we do with these advection rates?
Carbon Isotopes on the platform margin
A consistent story?
Dissecting The problem • Diffusion rates are well-constrained experimentally
Summarizing the process . Carbonate and fluid geochemistry can be modeled over time. . This requires an understanding of reactive and advective behavior
Thank you for listening Referencing of work
IAS
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