[Eoas-seminar] Updated - MS Defense WED 9/16 at 10!

[eoas-seminar at lists.fsu.edu]

Please join us for Mackenzie Hopkins MS Defense.


Title: EXPLORATION OF THE VALENTINE VENTS: A NEWLY DISCOVERED SITE OF DIFFUSE, LOW-TEMPERATURE, SEDIMENT-HOSTED VOLCANIC ACTIVITY IN THE AMUNDSEN SEA, ANTARCTICA

Name: Mackenzie Hopkins

Date: September 16, 2026 from 10-1 Eastern Time (US and Canada)

Location: EOAS 2052

Major Professor: Dr. Lisa Herbert

Zoom:  https://fsu.zoom.us/j/94300256829<https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Ffsu.zoom.us%2Fj%2F94300256829&data=05%7C02%7Ceoas-seminar%40lists.fsu.edu%7Cd2f536485c8a4e48eb8908df13602f5a%7Ca36450ebdb0642a78d1b026719f701e3%7C0%7C0%7C639250975950880358%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=Xtnb8pY3OQWhtmmtWlrJ2nI86jkl9ppeY32TTSpo3DI%3D&reserved=0>

Meeting ID: 943 0025 6829


Abstract: New findings off the west coast of Antarctica reveal the possibility of magmatic influence at a marine sediment-hosted diffuse vent field in the Amundsen Sea. This previously undocumented site, coined the “Valentine Vents”, exhibits a low pH and low salinity alongside high concentrations of dissolved CO2 in the pore water. Pore water Mn, Fe, Co, Ni, U, Zn, and rare earth elements (REE) Yb and Nd show high concentrations compared to typical sea water concentrations as well as sediments from nearby sites, while several elements (Cu, Cr, and Mo) are depleted. High levels of reactive iron and manganese were also observed. Initial physical observations coupled with preliminary geochemical findings suggest diffuse venting of low-oxygen, low-sulfur magmatic fluid enriched in CO2 and trace metals. This site, located in a local depression in the seafloor, may overlie a magmatic intrusion causing degassing and upward fluid transport through the glacial sediment cover. This is consistent with the known presence of continental vulcanism in this region of West Antarctic. The discovery of this site could lead to a paradigm shift in our understanding of the sources of trace metals necessary for primary production in the Amundsen Sea.




Adea Arrison

Sr. Academic Program Specialist

Department of Earth, Ocean & Atmospheric Science

[cid:613f8cc5-11bc-447a-8b9a-ff52bd08a4fa]<https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.eoas.fsu.edu%2F&data=05%7C02%7Ceoas-seminar%40lists.fsu.edu%7Cd2f536485c8a4e48eb8908df13602f5a%7Ca36450ebdb0642a78d1b026719f701e3%7C0%7C0%7C639250975951005154%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=scFeHf8WcNdP%2F9slH%2BgVVzJB90gcDNw5zrGmcHewd4g%3D&reserved=0>


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