Signal Preservation: Global Perspective on Magnetite Dissolution and Local Insights into Greigite Formation

Explore a comprehensive talk on magnetite dissolution and greigite formation in sedimentary environments. Delve into a global perspective on magnetite preservation factors, including sedimentation rate, sulfate levels, and total organic carbon. Examine a local study of greigite formation in euxinic meromictic lakes, highlighting the complexity of magnetic mineralogy and grain size variations. Gain insights into the critical role of environmental chemistry in magnetic mineral formation and dissolution, and its implications for interpreting paleomagnetic records in ancient sedimentary rocks. Learn about new directions for the MagIC database and the importance of modern environmental magnetic analyses in understanding sedimentary archives.

Intro
The Sediment and Sedimentary Rock Record
Pore Water Chemistry
Biogeochemical Diagenetic Processes
Mineral Formation (and Dissolution)
Outline
Magnetite Dissolution/Preservation
Magnetite Preservation Factors: Sedimentation Rate
Global Compilation
Magnetite Abundance
Sulfate
Site Specific Influences
Total Organic Carbon
Identifying Authigenesis and Ferruginous Environments
Part 1: Conclusions
Greigite Formation
Local Meromictic Lakes
Water Column Profiles and Magnetics
Sediment Magnetics
More Lakes = More Nuance
Part 2: Summary
Questions?