When: Tuesday, 11th November 2025, 9 AM GMT
Join us for our next seminar with our speaker Jodi Fox, Institute for Marine and Antarctic Studies, University of Tasmania, Australia. Jodi is presenting her work on marine sediment cores from Antarctica, which is related to her work at the National Museum of Nature and Science in Tsukuba, Japan.
Register here to receive the Zoom meeting invitation and/or access the recording, which will become available after the meeting. After registering, you will receive a confirmation email containing information about joining the meeting.
Jodi Fox1,2, Kenichiro Tani1, Osamu Ishizuka3, Asuka Yamaguchi4 and Minoru Ikehara5
1National Museum of Nature and Science, Tsukuba, Japan
2Institute for Marine and Antarctic Studies, University of Tasmania, Australia,
3Geological Survey of Japan/AIST, Tsukuba, Japan
4Atmosphere and Ocean Research Institute, University of Tokyo, Japan
5Marine Core Research Institute, Kochi University, Japan
Marine sediment cores adjacent to Antarctica are valuable because they contain more complete records of the explosive activity of Antarctic region volcanoes than the small number of Antarctic terrestrial sediment cores or the limited tephra preserved in Antarctic ice cores. Volcanic glass shards were identified in two new marine sediment cores from the South Shetland Islands region during the RV Hakuho Maru KH-19-6 Leg 4 2019/2020 voyage. Core PC01 was collected in Bransfield Strait and core PC04 in the South Shetland Trough. This region is of volcanological interest for several reasons including that it meets geographic and geological location criteria needed to investigate the relationship between volcanism and glacial isostatic adjustment. We present the results from physical and geochemical characterisation of the volcanic glass shards within these cores together with results of C14 organic carbon dating and paleoenvironmental studies of the cores. PC04 hosts 3 layers of tephra comprising volcanic glass shards with bimodal dacite-rhyolite and andesite-basaltic andesite compositions. PC01 contains 14 layers hosting volcanic glass shards. Between ca. 6-5 ka the glass shard compositions are primarily basalt-basaltic andesite. At 3 150 ± 200 ka, PC01 glass shard compositions are bimodal comprising rhyolite and basalt-basaltic andesite. Trace and major element compositions provide a geochemical fingerprint consistent with pre- and post-caldera collapse (3 980 ± 125 yr; Antoniades et al., 2018) Deception Island sources for most PC01and PC04 volcanic glass shards. Using biological production, ice sheet melting and land source debris indices we identified at least 3 local ice sheet melting events within PC01 and consider the relationship between the timing of volcanism recorded in the cores and the melting events.
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