Revisiting to seawater contributions to volcanics in Mid-Ocean Ridges and in back-arc spreading center

Hidenori Kumagai

Presentation information

[J] Oral

S (Solid Earth Sciences ) » S-VC Volcanology

[S-VC34] Volcanoes in the Sea

Wed. May 24, 2023 10:45 AM - 12:00 PM 303 (International Conference Hall, Makuhari Messe)

convener:Yoshihiko Tamura(Research Institute for Marine Geodynamics, Japan Agency for Maine-Earth Science and Technology), Eisuke Fujita(National research Instituite for Earth science and Disaster Resilience, Volcanic research department), Fukashi Maeno(Earthquake Research Institute, University of Tokyo), Shigeaki Ono(Japan Agency for Marine-Earth Science and Technology), Chairperson:Shigeaki Ono(Japan Agency for Marine-Earth Science and Technology), Yoshihiko Tamura(Research Institute for Marine Geodynamics, Japan Agency for Maine-Earth Science and Technology)

11:45 AM - 12:00 PM

[SVC34-10] Revisiting to seawater contributions to volcanics in Mid-Ocean Ridges and in back-arc spreading center

*Hidenori Kumagai^1,2 (1.Gakushuin Wemen’s College, 2.Japan Agency for Marine-Earth Science and Technology)

Keywords:Mid Ocean Ridges, Back-arc spreading center, Noble gas elemental ratios, Melt-seawater interaction

Inspired by Tamura+(2022)'s model of formation of MOHO, here we revisited to a seawater contribution on noble gas signatures of volcanics at spreading centers of ocean floor. Details are in Japanese abstract.

Figure caption: Noble gas elemental ratios for samples obtained from Lau Basin. Data were taken from Honda+(1993). Size of the symbols reflect their ³⁶Ar abundances, which is frequently regarded to be an indicator of atmospheric contamination. Filled circles: Central Lau Spreading Center, Open circles: King's Triple Junction. The data for Eastern Lau Spreading Center is plotted outside of the frame due to ¹³²Xe enrichment.