Web: https://www.geosociety.org/GSA/Events/Section_Meetings/GSA/Sections/nc/2020mtg/home.aspx
Includes the following sessions:
T2. Intrusive rocks of the Midcontinent Rift
Convenors: Joshua Feinberg (feinberg@umn.edu), Nicholas Swanson-Hysell (swanson-hysell@berkeley.edu), Mark Severson
Intrusive rocks associated with the Midcontinent Rift System preserve a remarkable record of tectonic and magmatic processes within the interior of Laurentia. This session seeks to highlight new geological, geochemical, petrologic, and geophysical research into the rift that is expanding our understanding of rift formation, Proterozoic earth history, and mineralization. New geochronologic and geochemical data are revealing insights into mantle dynamics during the rift’s formation and the changing nature of intrusions through the rift’s history. Field, geophysical survey, and mineral fabric studies offer new clues to intrusive emplacement mechanisms and timing. Significant mineralization within the rift continues to be a focus of exploration and research. Paleomagnetic studies continue to enhance chronostratigraphic correlations and reveal new insights into Laurentia’s paleogeography throughout the rift’s evolution. Here in the eponymous city of the Duluth Complex, we will discuss the extended and spectacular magmatic history recorded by intrusive rocks of the Midcontinent Rift.
T6. Deciphering the record of Lake Superior iron formations
Convenors: Athena Eyster (aeyster@mit.edu), Latisha Brengman (lbrengma@d.umn.edu), Chad Wittkop (chad.wittkop@mnsu.edu)
Ever since they were first discovered, the Precambrian banded iron formations of the Lake Superior region have fascinated scientists around the world. The geological, geochemical, and geobiological importance of these unique formations continue to be explored and deciphered. We welcome contributions that present new datasets and interpretations of the ancient Lake Superior iron formations, as well as those that utilize experiments, modeling, or modern analogs to explore the genesis of iron-rich sediments.