© Sophie Roud
To kick off the winter 2025/2025 round of the DeepDyn seminar, we will hear a presentation by Sophie Roud. Sophie is researcher and Head of the Laboratory for Geomagnetism in Space and Time at GFZ Potsdam.
In her lecture Reliability of Magnetic Records: The Role of Microbial and Chemical Processes, she will present her experiments with magnetotactic bacteria.
This time, Sunaina Shinu is the Early Career Co-Host.
The DeepDyn seminar takes place online as a zoom-meeting. DeepDyn members will automatically receive the access link before the seminar. We ask external seminar guests to register for the seminar in order to receive the access link.
Reliability of Magnetic Records: The Role of Microbial and Chemical Processes
Abstract
Sedimentary archives of the geomagnetic field reflect not only depositional processes but also post-depositional mineral formation. Magnetic minerals may originate from chemical transformations or microbial activity, such as magnetotactic bacteria producing magnetofossils within sedimentary redox zones. Whether diagenetic and microbial mineral formation is confined to surface sediments or also occurs at depth remains a key question for assessing the timing of the paleomagnetic signal. The efficiency with which these authigenic particles acquire a remanent magnetization can also differ from depositional processes, complicating interpretations of past field intensity. The seminar will present results from Baltic Sea sediments, where both biogenic and diagenetic greigite provide insights into these processes and their impact on geomagnetic reconstructions.
Link zum nächsten Seminarvortrag
with Gerd Steinle-Neumann (Universität Bayreuth)